lzx_compress: add new block splitting algorithm

[wimlib] / include / wimlib.h

/**
 * @file wimlib.h
 * @brief External header for wimlib.
 *
 * This file contains comments for generating documentation with Doxygen.  The
 * built HTML documentation can be viewed at https://wimlib.net/apidoc.  Make
 * sure to see the <a href="modules.html">Modules page</a> to make more sense of
 * the declarations in this header.
 */

/**
 * @mainpage
 *
 * This is the documentation for the library interface of wimlib 1.9.2, a C
 * library for creating, modifying, extracting, and mounting files in the
 * Windows Imaging Format.  This documentation is intended for developers only.
 * If you have installed wimlib and want to know how to use the @b wimlib-imagex
 * program, please see the manual pages and also the <a
 * href="https://wimlib.net/git/?p=wimlib;a=blob;f=README">README file</a>.
 *
 * @section sec_installing Installing
 *
 * @subsection UNIX
 *
 * Download the source code from https://wimlib.net.  Install the library by
 * running <c>configure && make && sudo make install</c>.  See the README for
 * information about configuration options.  To use wimlib in your program after
 * installing it, include wimlib.h and link your program with <c>-lwim</c>.
 *
 * @subsection Windows
 *
 * Download the Windows binary distribution with the appropriate architecture
 * (i686 or x86_64 --- also called "x86" and "amd64" respectively) from
 * https://wimlib.net.  Link your program with the libwim-15.dll file.  Make
 * sure to also download the source code so you can get wimlib.h, as it is not
 * included in the binary distribution.  If you need to access the DLL from
 * other programming languages, note that the calling convention is "cdecl".
 *
 * Note that wimlib is developed using MinGW-w64, and there may be a little work
 * required if you plan to use the header and DLL with Visual Studio.
 *
 * @section sec_examples Examples
 *
 * Several examples are located in the "examples" directory of the source
 * distribution.  Also see @ref sec_basic_wim_handling_concepts below.
 *
 * There is also the <a
 * href="https://wimlib.net/git/?p=wimlib;a=blob;f=programs/imagex.c">
 * source code of <b>wimlib-imagex</b></a>, which is complicated but uses most
 * capabilities of wimlib.
 *
 * @section backward_compatibility Backward Compatibility
 *
 * New releases of wimlib are intended to be backward compatible with old
 * releases, except when the libtool "age" is reset.  This most recently
 * occurred for the v1.7.0 (libwim15) release (June 2014).  Since the library is
 * becoming increasingly stable, the goal is to maintain the current API/ABI for
 * as long as possible unless there is a strong reason not to.
 *
 * As with any other library, applications should not rely on internal
 * implementation details that may be subject to change.
 *
 * @section sec_basic_wim_handling_concepts Basic WIM handling concepts
 *
 * wimlib wraps up a WIM file in an opaque ::WIMStruct structure.   There are
 * two ways to create such a structure:
 *
 * 1. wimlib_open_wim() opens an on-disk WIM file and creates a ::WIMStruct for
 *    it.
 * 2. wimlib_create_new_wim() creates a new ::WIMStruct that initially contains
 *    no images and does not yet have a backing on-disk file.
 *
 * A ::WIMStruct contains zero or more independent directory trees called @a
 * images.  Images may be extracted, added, deleted, exported, and updated using
 * various API functions.  (See @ref G_extracting_wims and @ref G_modifying_wims
 * for more details.)
 *
 * Changes made to a WIM represented by a ::WIMStruct have no persistent effect
 * until the WIM is actually written to an on-disk file.  This can be done using
 * wimlib_write(), but if the WIM was originally opened using wimlib_open_wim(),
 * then wimlib_overwrite() can be used instead.  (See @ref
 * G_writing_and_overwriting_wims for more details.)
 *
 * wimlib's API is designed to let you combine functions to accomplish tasks in
 * a flexible way.  Here are some example sequences of function calls:
 *
 * Apply an image from a WIM file, similar to the command-line program
 * <b>wimapply</b>:
 *
 * 1. wimlib_open_wim()
 * 2. wimlib_extract_image()
 *
 * Capture an image into a new WIM file, similar to <b>wimcapture</b>:
 *
 * 1. wimlib_create_new_wim()
 * 2. wimlib_add_image()
 * 3. wimlib_write()
 *
 * Append an image to an existing WIM file, similar to <b>wimappend</b>:
 *
 * 1. wimlib_open_wim()
 * 2. wimlib_add_image()
 * 3. wimlib_overwrite()
 *
 * Delete an image from an existing WIM file, similar to <b>wimdelete</b>:
 *
 * 1. wimlib_open_wim()
 * 2. wimlib_delete_image()
 * 3. wimlib_overwrite()
 *
 * Export an image from one WIM file to another, similar to <b>wimexport</b>:
 *
 * 1. wimlib_open_wim() (on source)
 * 2. wimlib_open_wim() (on destination)
 * 3. wimlib_export_image()
 * 4. wimlib_overwrite() (on destination)
 *
 * The API also lets you do things the command-line tools don't directly allow.
 * For example, you could make multiple changes to a WIM before efficiently
 * committing the changes with just one call to wimlib_overwrite().  Perhaps you
 * want to both delete an image and add a new one; or perhaps you want to
 * customize an image with wimlib_update_image() after adding it.  All these use
 * cases are supported by the API.
 *
 * @section sec_cleaning_up Cleaning up
 *
 * After you are done with any ::WIMStruct, you can call wimlib_free() to free
 * all resources associated with it.  Also, when you are completely done with
 * using wimlib in your program, you can call wimlib_global_cleanup() to free
 * any other resources allocated by the library.
 *
 * @section sec_error_handling Error Handling
 *
 * Most functions in wimlib return 0 on success and a positive
 * ::wimlib_error_code value on failure.  Use wimlib_get_error_string() to get a
 * string that describes an error code.  wimlib also can print error messages to
 * standard error or a custom file when an error occurs, and these may be more
 * informative than the error code; to enable this, call
 * wimlib_set_print_errors().  Please note that this is for convenience only,
 * and some errors can occur without a message being printed.  Currently, error
 * messages and strings (as well as all documentation, for that matter) are only
 * available in English.
 *
 * @section sec_encodings Locales and character encodings
 *
 * To support Windows as well as UNIX-like systems, wimlib's API typically takes
 * and returns strings of ::wimlib_tchar, which are in a platform-dependent
 * encoding.
 *
 * On Windows, each ::wimlib_tchar is 2 bytes and is the same as a "wchar_t",
 * and the encoding is UTF-16LE.
 *
 * On UNIX-like systems, each ::wimlib_tchar is 1 byte and is simply a "char",
 * and the encoding is UTF-8.
 *
 * @section sec_advanced Additional information and features
 *
 *
 * @subsection subsec_mounting_wim_images Mounting WIM images
 *
 * See @ref G_mounting_wim_images.
 *
 * @subsection subsec_progress_functions Progress Messages
 *
 * See @ref G_progress.
 *
 * @subsection subsec_non_standalone_wims Non-standalone WIMs
 *
 * See @ref G_nonstandalone_wims.
 *
 * @subsection subsec_pipable_wims Pipable WIMs
 *
 * wimlib supports a special "pipable" WIM format which unfortunately is @b not
 * compatible with Microsoft's software.  To create a pipable WIM, call
 * wimlib_write(), wimlib_write_to_fd(), or wimlib_overwrite() with
 * ::WIMLIB_WRITE_FLAG_PIPABLE specified.  Pipable WIMs are pipable in both
 * directions, so wimlib_write_to_fd() can be used to write a pipable WIM to a
 * pipe, and wimlib_extract_image_from_pipe() can be used to apply an image from
 * a pipable WIM.  wimlib can also transparently open and operate on pipable WIM
 * s using a seekable file descriptor using the regular function calls (e.g.
 * wimlib_open_wim(), wimlib_extract_image()).
 *
 * See the documentation for the <b>--pipable</b> flag of <b>wimcapture</b> for
 * more information about pipable WIMs.
 *
 * @subsection subsec_thread_safety Thread Safety
 *
 * A ::WIMStruct is not thread-safe and cannot be accessed by multiple threads
 * concurrently, even for "read-only" operations such as extraction.  However,
 * users are free to use <i>different</i> ::WIMStruct's from different threads
 * concurrently.  It is even allowed for multiple ::WIMStruct's to be backed by
 * the same on-disk WIM file, although "overwrites" should never be done in such
 * a scenario.
 *
 * In addition, several functions change global state and should only be called
 * when a single thread is active in the library.  These functions are:
 *
 * - wimlib_global_init()
 * - wimlib_global_cleanup()
 * - wimlib_set_memory_allocator()
 * - wimlib_set_print_errors()
 * - wimlib_set_error_file()
 * - wimlib_set_error_file_by_name()
 *
 * @subsection subsec_limitations Limitations
 *
 * This section documents some technical limitations of wimlib not already
 * described in the documentation for @b wimlib-imagex.
 *
 * - The old WIM format from Vista pre-releases is not supported.
 * - wimlib does not provide a clone of the @b PEImg tool, or the @b DISM
 *   functionality other than that already present in @b ImageX, that allows you
 *   to make certain Windows-specific modifications to a Windows PE image, such
 *   as adding a driver or Windows component.  Such a tool could be implemented
 *   on top of wimlib.
 *
 * @subsection more_info More information
 *
 * You are advised to read the README as well as the documentation for
 * <b>wimlib-imagex</b>, since not all relevant information is repeated here in
 * the API documentation.
 */

/** @defgroup G_general General
 *
 * @brief Declarations and structures shared across the library.
 */

/** @defgroup G_creating_and_opening_wims Creating and Opening WIMs
 *
 * @brief Open an existing WIM file as a ::WIMStruct, or create a new
 * ::WIMStruct which can be used to create a new WIM file.
 */

/** @defgroup G_wim_information Retrieving WIM information and directory listings
 *
 * @brief Retrieve information about a WIM or WIM image.
 */

/** @defgroup G_modifying_wims Modifying WIMs
 *
 * @brief Make changes to a ::WIMStruct, in preparation of persisting the
 * ::WIMStruct to an on-disk file.
 *
 * @section sec_adding_images Capturing and adding WIM images
 *
 * As described in @ref sec_basic_wim_handling_concepts, capturing a new WIM or
 * appending an image to an existing WIM is a multi-step process, but at its
 * core is wimlib_add_image() or an equivalent function.  Normally,
 * wimlib_add_image() takes an on-disk directory tree and logically adds it to a
 * ::WIMStruct as a new image.  However, when supported by the build of the
 * library, there is also a special NTFS volume capture mode (entered when
 * ::WIMLIB_ADD_FLAG_NTFS is specified) that allows adding the image directly
 * from an unmounted NTFS volume.
 *
 * Another function, wimlib_add_image_multisource() is also provided.  It
 * generalizes wimlib_add_image() to allow combining multiple files or directory
 * trees into a single WIM image in a configurable way.
 *
 * For maximum customization of WIM image creation, it is also possible to add a
 * completely empty WIM image with wimlib_add_empty_image(), then update it with
 * wimlib_update_image().  (This is in fact what wimlib_add_image() and
 * wimlib_add_image_multisource() do internally.)
 *
 * Note that some details of how image addition/capture works are documented
 * more fully in the documentation for <b>wimcapture</b>.
 *
 * @section sec_deleting_images Deleting WIM images
 *
 * wimlib_delete_image() can delete an image from a ::WIMStruct.  But as usual,
 * wimlib_write() or wimlib_overwrite() must be called to cause the changes to
 * be made persistent in an on-disk WIM file.
 *
 * @section sec_exporting_images Exporting WIM images
 *
 * wimlib_export_image() can copy, or "export", an image from one WIM to
 * another.
 *
 * @section sec_other_modifications Other modifications
 *
 * wimlib_update_image() can add, delete, and rename files in a WIM image.
 *
 * wimlib_set_image_property() can change other image metadata.
 *
 * wimlib_set_wim_info() can change information about the WIM file itself, such
 * as the boot index.
 */

/** @defgroup G_extracting_wims Extracting WIMs
 *
 * @brief Extract files, directories, and images from a WIM.
 *
 * wimlib_extract_image() extracts, or "applies", an image from a WIM,
 * represented by a ::WIMStruct.  This normally extracts the image to a
 * directory, but when supported by the build of the library there is also a
 * special NTFS volume extraction mode (entered when ::WIMLIB_EXTRACT_FLAG_NTFS
 * is specified) that allows extracting a WIM image directly to an unmounted
 * NTFS volume.  Various other flags allow further customization of image
 * extraction.
 *
 * wimlib_extract_paths() and wimlib_extract_pathlist() allow extracting a list
 * of (possibly wildcard) paths from a WIM image.
 *
 * wimlib_extract_image_from_pipe() extracts an image from a pipable WIM sent
 * over a pipe; see @ref subsec_pipable_wims.
 *
 * Some details of how WIM extraction works are described more fully in the
 * documentation for <b>wimapply</b> and <b>wimextract</b>.
 */

/** @defgroup G_mounting_wim_images Mounting WIM images
 *
 * @brief Mount and unmount WIM images.
 *
 * On Linux, wimlib supports mounting images from WIM files either read-only or
 * read-write.  To mount an image, call wimlib_mount_image().  To unmount an
 * image, call wimlib_unmount_image().  Mounting can be done without root
 * privileges because it is implemented using FUSE (Filesystem in Userspace).
 *
 * If wimlib is compiled using the <c>--without-fuse</c> flag, these functions
 * will be available but will fail with ::WIMLIB_ERR_UNSUPPORTED.
 *
 * Note: if mounting is unsupported, wimlib still provides another way to modify
 * a WIM image (wimlib_update_image()).
 */

/**
 * @defgroup G_progress Progress Messages
 *
 * @brief Track the progress of long WIM operations.
 *
 * Library users can provide a progress function which will be called
 * periodically during operations such as extracting a WIM image or writing a
 * WIM image.  A ::WIMStruct can have a progress function of type
 * ::wimlib_progress_func_t associated with it by calling
 * wimlib_register_progress_function() or by opening the ::WIMStruct using
 * wimlib_open_wim_with_progress().  Once this is done, the progress function
 * will be called automatically during many operations, such as
 * wimlib_extract_image() and wimlib_write().
 *
 * Some functions that do not operate directly on a user-provided ::WIMStruct,
 * such as wimlib_join(), also take the progress function directly using an
 * extended version of the function, such as wimlib_join_with_progress().
 *
 * Since wimlib v1.7.0, progress functions are no longer just unidirectional.
 * You can now return ::WIMLIB_PROGRESS_STATUS_ABORT to cause the current
 * operation to be aborted.  wimlib v1.7.0 also added the third argument to
 * ::wimlib_progress_func_t, which is a user-supplied context.
 */

/** @defgroup G_writing_and_overwriting_wims Writing and Overwriting WIMs
 *
 * @brief Create or update an on-disk WIM file.
 *
 * wimlib_write() creates a new on-disk WIM file, whereas wimlib_overwrite()
 * updates an existing WIM file.  See @ref sec_basic_wim_handling_concepts for
 * more information about the API design.
 */

/** @defgroup G_nonstandalone_wims Creating and handling non-standalone WIMs
 *
 * @brief Create and handle non-standalone WIMs, such as split and delta WIMs.
 *
 * A ::WIMStruct backed by an on-disk file normally represents a fully
 * standalone WIM archive.  However, WIM archives can also be arranged in
 * non-standalone ways, such as a set of on-disk files that together form a
 * single "split WIM" or "delta WIM".  Such arrangements are fully supported by
 * wimlib.  However, as a result, in such cases a ::WIMStruct created from one
 * of these on-disk files initially only partially represents the full WIM and
 * needs to, in effect, be logically combined with other ::WIMStruct's before
 * performing certain operations, such as extracting files with
 * wimlib_extract_image() or wimlib_extract_paths().  This is done by calling
 * wimlib_reference_resource_files() or wimlib_reference_resources().  Note: if
 * you fail to do so, you may see the error code
 * ::WIMLIB_ERR_RESOURCE_NOT_FOUND; this just indicates that data is not
 * available because the appropriate WIM files have not yet been referenced.
 *
 * wimlib_write() can create delta WIMs as well as standalone WIMs, but a
 * specialized function (wimlib_split()) is needed to create a split WIM.
 */

#ifndef _WIMLIB_H
#define _WIMLIB_H

#include <stdio.h>
#include <stddef.h>
#include <stdbool.h>
#include <inttypes.h>
#include <time.h>

/** @addtogroup G_general
 * @{ */

/** Major version of the library (for example, the 1 in 1.2.5).  */
#define WIMLIB_MAJOR_VERSION 1

/** Minor version of the library (for example, the 2 in 1.2.5). */
#define WIMLIB_MINOR_VERSION 9

/** Patch version of the library (for example, the 5 in 1.2.5). */
#define WIMLIB_PATCH_VERSION 2

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Opaque structure that represents a WIM, possibly backed by an on-disk file.
 * See @ref sec_basic_wim_handling_concepts for more information.
 */
#ifndef WIMLIB_WIMSTRUCT_DECLARED
typedef struct WIMStruct WIMStruct;
#define WIMLIB_WIMSTRUCT_DECLARED
#endif

#ifdef __WIN32__
typedef wchar_t wimlib_tchar;
#else
/** See @ref sec_encodings */
typedef char wimlib_tchar;
#endif

#ifdef __WIN32__
/** Path separator for WIM paths passed back to progress callbacks.
 * This is forward slash on UNIX and backslash on Windows.  */
#  define WIMLIB_WIM_PATH_SEPARATOR '\\'
#  define WIMLIB_WIM_PATH_SEPARATOR_STRING L"\\"
#else
/** Path separator for WIM paths passed back to progress callbacks.
 * This is forward slash on UNIX and backslash on Windows.  */
#  define WIMLIB_WIM_PATH_SEPARATOR '/'
#  define WIMLIB_WIM_PATH_SEPARATOR_STRING "/"
#endif

/** A string containing a single path separator; use this to specify the root
 * directory of a WIM image.  */
#define WIMLIB_WIM_ROOT_PATH WIMLIB_WIM_PATH_SEPARATOR_STRING

/** Use this to test if the specified path refers to the root directory of the
 * WIM image.  */
#define WIMLIB_IS_WIM_ROOT_PATH(path) \
                ((path)[0] == WIMLIB_WIM_PATH_SEPARATOR &&      \
                 (path)[1] == 0)

/** Length of a Globally Unique Identifier (GUID), in bytes.  */
#define WIMLIB_GUID_LEN 16

/**
 * Specifies a compression type.
 *
 * A WIM file has a default compression type, indicated by its file header.
 * Normally, each resource in the WIM file is compressed with this compression
 * type.  However, resources may be stored as uncompressed; for example, wimlib
 * may do so if a resource does not compress to less than its original size.  In
 * addition, a WIM with the new version number of 3584, or "ESD file", might
 * contain solid resources with different compression types.
 */
enum wimlib_compression_type {
        /**
         * No compression.
         *
         * This is a valid argument to wimlib_create_new_wim() and
         * wimlib_set_output_compression_type(), but not to the functions in the
         * compression API such as wimlib_create_compressor().
         */
        WIMLIB_COMPRESSION_TYPE_NONE = 0,

        /**
         * The XPRESS compression format.  This format combines Lempel-Ziv
         * factorization with Huffman encoding.  Compression and decompression
         * are both fast.  This format supports chunk sizes that are powers of 2
         * between <c>2^12</c> and <c>2^16</c>, inclusively.
         *
         * wimlib's XPRESS compressor will, with the default settings, usually
         * produce a better compression ratio, and work more quickly, than the
         * implementation in Microsoft's WIMGAPI (as of Windows 8.1).
         * Non-default compression levels are also supported.  For example,
         * level 80 will enable two-pass optimal parsing, which is significantly
         * slower but usually improves compression by several percent over the
         * default level of 50.
         *
         * If using wimlib_create_compressor() to create an XPRESS compressor
         * directly, the @p max_block_size parameter may be any positive value
         * up to and including <c>2^16</c>.
         */
        WIMLIB_COMPRESSION_TYPE_XPRESS = 1,

        /**
         * The LZX compression format.  This format combines Lempel-Ziv
         * factorization with Huffman encoding, but with more features and
         * complexity than XPRESS.  Compression is slow to somewhat fast,
         * depending on the settings.  Decompression is fast but slower than
         * XPRESS.  This format supports chunk sizes that are powers of 2
         * between <c>2^15</c> and <c>2^21</c>, inclusively.  Note: chunk sizes
         * other than <c>2^15</c> are not compatible with the Microsoft
         * implementation.
         *
         * wimlib's LZX compressor will, with the default settings, usually
         * produce a better compression ratio, and work more quickly, than the
         * implementation in Microsoft's WIMGAPI (as of Windows 8.1).
         * Non-default compression levels are also supported.  For example,
         * level 20 will provide fast compression, almost as fast as XPRESS.
         *
         * If using wimlib_create_compressor() to create an LZX compressor
         * directly, the @p max_block_size parameter may be any positive value
         * up to and including <c>2^21</c>.
         */
        WIMLIB_COMPRESSION_TYPE_LZX = 2,

        /**
         * The LZMS compression format.  This format combines Lempel-Ziv
         * factorization with adaptive Huffman encoding and range coding.
         * Compression and decompression are both fairly slow.  This format
         * supports chunk sizes that are powers of 2 between <c>2^15</c> and
         * <c>2^30</c>, inclusively.  This format is best used for large chunk
         * sizes.  Note: LZMS compression is only compatible with wimlib v1.6.0
         * and later, WIMGAPI Windows 8 and later, and DISM Windows 8.1 and
         * later.  Also, chunk sizes larger than <c>2^26</c> are not compatible
         * with the Microsoft implementation.
         *
         * wimlib's LZMS compressor will, with the default settings, usually
         * produce a better compression ratio, and work more quickly, than the
         * implementation in Microsoft's WIMGAPI (as of Windows 8.1).  There is
         * limited support for non-default compression levels, but compression
         * will be noticeably faster if you choose a level < 35.
         *
         * If using wimlib_create_compressor() to create an LZMS compressor
         * directly, the @p max_block_size parameter may be any positive value
         * up to and including <c>2^30</c>.
         */
        WIMLIB_COMPRESSION_TYPE_LZMS = 3,
};

/** @} */
/** @addtogroup G_progress
 * @{ */

/** Possible values of the first parameter to the user-supplied
 * ::wimlib_progress_func_t progress function */
enum wimlib_progress_msg {

        /** A WIM image is about to be extracted.  @p info will point to
         * ::wimlib_progress_info.extract.  This message is received once per
         * image for calls to wimlib_extract_image() and
         * wimlib_extract_image_from_pipe().  */
        WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN = 0,

        /** One or more file or directory trees within a WIM image is about to
         * be extracted.  @p info will point to ::wimlib_progress_info.extract.
         * This message is received only once per wimlib_extract_paths() and
         * wimlib_extract_pathlist(), since wimlib combines all paths into a
         * single extraction operation for optimization purposes.  */
        WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN = 1,

        /** This message may be sent periodically (not for every file) while
         * files and directories are being created, prior to file data
         * extraction.  @p info will point to ::wimlib_progress_info.extract.
         * In particular, the @p current_file_count and @p end_file_count
         * members may be used to track the progress of this phase of
         * extraction.  */
        WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE = 3,

        /** File data is currently being extracted.  @p info will point to
         * ::wimlib_progress_info.extract.  This is the main message to track
         * the progress of an extraction operation.  */
        WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS = 4,

        /** Starting to read a new part of a split pipable WIM over the pipe.
         * @p info will point to ::wimlib_progress_info.extract.  */
        WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN = 5,

        /** This message may be sent periodically (not necessarily for every
         * file) while file and directory metadata is being extracted, following
         * file data extraction.  @p info will point to
         * ::wimlib_progress_info.extract.  The @p current_file_count and @p
         * end_file_count members may be used to track the progress of this
         * phase of extraction.  */
        WIMLIB_PROGRESS_MSG_EXTRACT_METADATA = 6,

        /** The image has been successfully extracted.  @p info will point to
         * ::wimlib_progress_info.extract.  This is paired with
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN.  */
        WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END = 7,

        /** The files or directory trees have been successfully extracted.  @p
         * info will point to ::wimlib_progress_info.extract.  This is paired
         * with ::WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN.  */
        WIMLIB_PROGRESS_MSG_EXTRACT_TREE_END = 8,

        /** The directory or NTFS volume is about to be scanned for metadata.
         * @p info will point to ::wimlib_progress_info.scan.  This message is
         * received once per call to wimlib_add_image(), or once per capture
         * source passed to wimlib_add_image_multisource(), or once per add
         * command passed to wimlib_update_image().  */
        WIMLIB_PROGRESS_MSG_SCAN_BEGIN = 9,

        /** A directory or file has been scanned.  @p info will point to
         * ::wimlib_progress_info.scan, and its @p cur_path member will be
         * valid.  This message is only sent if ::WIMLIB_ADD_FLAG_VERBOSE has
         * been specified.  */
        WIMLIB_PROGRESS_MSG_SCAN_DENTRY = 10,

        /** The directory or NTFS volume has been successfully scanned.  @p info
         * will point to ::wimlib_progress_info.scan.  This is paired with a
         * previous ::WIMLIB_PROGRESS_MSG_SCAN_BEGIN message, possibly with many
         * intervening ::WIMLIB_PROGRESS_MSG_SCAN_DENTRY messages.  */
        WIMLIB_PROGRESS_MSG_SCAN_END = 11,

        /** File data is currently being written to the WIM.  @p info will point
         * to ::wimlib_progress_info.write_streams.  This message may be
         * received many times while the WIM file is being written or appended
         * to with wimlib_write(), wimlib_overwrite(), or wimlib_write_to_fd().
         */
        WIMLIB_PROGRESS_MSG_WRITE_STREAMS = 12,

        /** Per-image metadata is about to be written to the WIM file.  @p info
         * will not be valid. */
        WIMLIB_PROGRESS_MSG_WRITE_METADATA_BEGIN = 13,

        /** The per-image metadata has been written to the WIM file.  @p info
         * will not be valid.  This message is paired with a preceding
         * ::WIMLIB_PROGRESS_MSG_WRITE_METADATA_BEGIN message.  */
        WIMLIB_PROGRESS_MSG_WRITE_METADATA_END = 14,

        /** wimlib_overwrite() has successfully renamed the temporary file to
         * the original WIM file, thereby committing the changes to the WIM
         * file.  @p info will point to ::wimlib_progress_info.rename.  Note:
         * this message is not received if wimlib_overwrite() chose to append to
         * the WIM file in-place.  */
        WIMLIB_PROGRESS_MSG_RENAME = 15,

        /** The contents of the WIM file are being checked against the integrity
         * table.  @p info will point to ::wimlib_progress_info.integrity.  This
         * message is only received (and may be received many times) when
         * wimlib_open_wim_with_progress() is called with the
         * ::WIMLIB_OPEN_FLAG_CHECK_INTEGRITY flag.  */
        WIMLIB_PROGRESS_MSG_VERIFY_INTEGRITY = 16,

        /** An integrity table is being calculated for the WIM being written.
         * @p info will point to ::wimlib_progress_info.integrity.  This message
         * is only received (and may be received many times) when a WIM file is
         * being written with the flag ::WIMLIB_WRITE_FLAG_CHECK_INTEGRITY.  */
        WIMLIB_PROGRESS_MSG_CALC_INTEGRITY = 17,

        /** A wimlib_split() operation is in progress, and a new split part is
         * about to be started.  @p info will point to
         * ::wimlib_progress_info.split.  */
        WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART = 19,

        /** A wimlib_split() operation is in progress, and a split part has been
         * finished. @p info will point to ::wimlib_progress_info.split.  */
        WIMLIB_PROGRESS_MSG_SPLIT_END_PART = 20,

        /** A WIM update command is about to be executed. @p info will point to
         * ::wimlib_progress_info.update.  This message is received once per
         * update command when wimlib_update_image() is called with the flag
         * ::WIMLIB_UPDATE_FLAG_SEND_PROGRESS.  */
        WIMLIB_PROGRESS_MSG_UPDATE_BEGIN_COMMAND = 21,

        /** A WIM update command has been executed. @p info will point to
         * ::wimlib_progress_info.update.  This message is received once per
         * update command when wimlib_update_image() is called with the flag
         * ::WIMLIB_UPDATE_FLAG_SEND_PROGRESS.  */
        WIMLIB_PROGRESS_MSG_UPDATE_END_COMMAND = 22,

        /** A file in the image is being replaced as a result of a
         * ::wimlib_add_command without ::WIMLIB_ADD_FLAG_NO_REPLACE specified.
         * @p info will point to ::wimlib_progress_info.replace.  This is only
         * received when ::WIMLIB_ADD_FLAG_VERBOSE is also specified in the add
         * command.  */
        WIMLIB_PROGRESS_MSG_REPLACE_FILE_IN_WIM = 23,

        /** An image is being extracted with ::WIMLIB_EXTRACT_FLAG_WIMBOOT, and
         * a file is being extracted normally (not as a "WIMBoot pointer file")
         * due to it matching a pattern in the <c>[PrepopulateList]</c> section
         * of the configuration file
         * <c>/Windows/System32/WimBootCompress.ini</c> in the WIM image.  @p
         * info will point to ::wimlib_progress_info.wimboot_exclude.  */
        WIMLIB_PROGRESS_MSG_WIMBOOT_EXCLUDE = 24,

        /** Starting to unmount an image.  @p info will point to
         * ::wimlib_progress_info.unmount.  */
        WIMLIB_PROGRESS_MSG_UNMOUNT_BEGIN = 25,

        /** wimlib has used a file's data for the last time (including all data
         * streams, if it has multiple).  @p info will point to
         * ::wimlib_progress_info.done_with_file.  This message is only received
         * if ::WIMLIB_WRITE_FLAG_SEND_DONE_WITH_FILE_MESSAGES was provided.  */
        WIMLIB_PROGRESS_MSG_DONE_WITH_FILE = 26,

        /** wimlib_verify_wim() is starting to verify the metadata for an image.
         * @p info will point to ::wimlib_progress_info.verify_image.  */
        WIMLIB_PROGRESS_MSG_BEGIN_VERIFY_IMAGE = 27,

        /** wimlib_verify_wim() has finished verifying the metadata for an
         * image.  @p info will point to ::wimlib_progress_info.verify_image.
         */
        WIMLIB_PROGRESS_MSG_END_VERIFY_IMAGE = 28,

        /** wimlib_verify_wim() is verifying file data integrity.  @p info will
         * point to ::wimlib_progress_info.verify_streams.  */
        WIMLIB_PROGRESS_MSG_VERIFY_STREAMS = 29,

        /**
         * The progress function is being asked whether a file should be
         * excluded from capture or not.  @p info will point to
         * ::wimlib_progress_info.test_file_exclusion.  This is a bidirectional
         * message that allows the progress function to set a flag if the file
         * should be excluded.
         *
         * This message is only received if the flag
         * ::WIMLIB_ADD_FLAG_TEST_FILE_EXCLUSION is used.  This method for file
         * exclusions is independent of the "capture configuration file"
         * mechanism.
         */
        WIMLIB_PROGRESS_MSG_TEST_FILE_EXCLUSION = 30,

        /**
         * An error has occurred and the progress function is being asked
         * whether to ignore the error or not.  @p info will point to
         * ::wimlib_progress_info.handle_error.  This is a bidirectional
         * message.
         *
         * This message provides a limited capability for applications to
         * recover from "unexpected" errors (i.e. those with no in-library
         * handling policy) arising from the underlying operating system.
         * Normally, any such error will cause the library to abort the current
         * operation.  By implementing a handler for this message, the
         * application can instead choose to ignore a given error.
         *
         * Currently, only the following types of errors will result in this
         * progress message being sent:
         *
         *      - Directory tree scan errors, e.g. from wimlib_add_image()
         *      - Most extraction errors; currently restricted to the Windows
         *        build of the library only.
         */
        WIMLIB_PROGRESS_MSG_HANDLE_ERROR = 31,
};

/** Valid return values from user-provided progress functions
 * (::wimlib_progress_func_t).
 *
 * (Note: if an invalid value is returned, ::WIMLIB_ERR_UNKNOWN_PROGRESS_STATUS
 * will be issued.)
 */
enum wimlib_progress_status {

        /** The operation should be continued.  This is the normal return value.
         */
        WIMLIB_PROGRESS_STATUS_CONTINUE = 0,

        /** The operation should be aborted.  This will cause the current
         * operation to fail with ::WIMLIB_ERR_ABORTED_BY_PROGRESS.  */
        WIMLIB_PROGRESS_STATUS_ABORT    = 1,
};

/**
 * A pointer to this union is passed to the user-supplied
 * ::wimlib_progress_func_t progress function.  One (or none) of the structures
 * contained in this union will be applicable for the operation
 * (::wimlib_progress_msg) indicated in the first argument to the progress
 * function. */
union wimlib_progress_info {

        /** Valid on the message ::WIMLIB_PROGRESS_MSG_WRITE_STREAMS.  This is
         * the primary message for tracking the progress of writing a WIM file.
         */
        struct wimlib_progress_info_write_streams {

                /** An upper bound on the number of bytes of file data that will
                 * be written.  This number is the uncompressed size; the actual
                 * size may be lower due to compression.  In addition, this
                 * number may decrease over time as duplicated file data is
                 * discovered.  */
                uint64_t total_bytes;

                /** An upper bound on the number of distinct file data "blobs"
                 * that will be written.  This will often be similar to the
                 * "number of files", but for several reasons (hard links, named
                 * data streams, empty files, etc.) it can be different.  In
                 * addition, this number may decrease over time as duplicated
                 * file data is discovered.  */
                uint64_t total_streams;

                /** The number of bytes of file data that have been written so
                 * far.  This starts at 0 and ends at @p total_bytes.  This
                 * number is the uncompressed size; the actual size may be lower
                 * due to compression.  */
                uint64_t completed_bytes;

                /** The number of distinct file data "blobs" that have been
                 * written so far.  This starts at 0 and ends at @p
                 * total_streams.  */
                uint64_t completed_streams;

                /** The number of threads being used for data compression; or,
                 * if no compression is being performed, this will be 1.  */
                uint32_t num_threads;

                /** The compression type being used, as one of the
                 * ::wimlib_compression_type constants.  */
                int32_t  compression_type;

                /** The number of on-disk WIM files from which file data is
                 * being exported into the output WIM file.  This can be 0, 1,
                 * or more than 1, depending on the situation.  */
                uint32_t total_parts;

                /** This is currently broken and will always be 0.  */
                uint32_t completed_parts;
        } write_streams;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_SCAN_BEGIN,
         * ::WIMLIB_PROGRESS_MSG_SCAN_DENTRY, and
         * ::WIMLIB_PROGRESS_MSG_SCAN_END.  */
        struct wimlib_progress_info_scan {

                /** Top-level directory being scanned; or, when capturing an NTFS
                 * volume with ::WIMLIB_ADD_FLAG_NTFS, this is instead the path
                 * to the file or block device that contains the NTFS volume
                 * being scanned.  */
                const wimlib_tchar *source;

                /** Path to the file (or directory) that has been scanned, valid
                 * on ::WIMLIB_PROGRESS_MSG_SCAN_DENTRY.  When capturing an NTFS
                 * volume with ::WIMLIB_ADD_FLAG_NTFS, this path will be
                 * relative to the root of the NTFS volume.  */
                const wimlib_tchar *cur_path;

                /** Dentry scan status, valid on
                 * ::WIMLIB_PROGRESS_MSG_SCAN_DENTRY.  */
                enum {
                        /** File looks okay and will be captured.  */
                        WIMLIB_SCAN_DENTRY_OK = 0,

                        /** File is being excluded from capture due to the
                         * capture configuration.  */
                        WIMLIB_SCAN_DENTRY_EXCLUDED = 1,

                        /** File is being excluded from capture due to being of
                         * an unsupported type.  */
                        WIMLIB_SCAN_DENTRY_UNSUPPORTED = 2,

                        /** The file is an absolute symbolic link or junction
                         * that points into the capture directory, and
                         * reparse-point fixups are enabled, so its target is
                         * being adjusted.  (Reparse point fixups can be
                         * disabled with the flag ::WIMLIB_ADD_FLAG_NORPFIX.)
                         */
                        WIMLIB_SCAN_DENTRY_FIXED_SYMLINK = 3,

                        /** Reparse-point fixups are enabled, but the file is an
                         * absolute symbolic link or junction that does
                         * <b>not</b> point into the capture directory, so its
                         * target is <b>not</b> being adjusted.  */
                        WIMLIB_SCAN_DENTRY_NOT_FIXED_SYMLINK = 4,
                } status;

                union {
                        /** Target path in the image.  Only valid on messages
                         * ::WIMLIB_PROGRESS_MSG_SCAN_BEGIN and
                         * ::WIMLIB_PROGRESS_MSG_SCAN_END.  */
                        const wimlib_tchar *wim_target_path;

                        /** For ::WIMLIB_PROGRESS_MSG_SCAN_DENTRY and a status
                         * of @p WIMLIB_SCAN_DENTRY_FIXED_SYMLINK or @p
                         * WIMLIB_SCAN_DENTRY_NOT_FIXED_SYMLINK, this is the
                         * target of the absolute symbolic link or junction.  */
                        const wimlib_tchar *symlink_target;
                };

                /** The number of directories scanned so far, not counting
                 * excluded/unsupported files.  */
                uint64_t num_dirs_scanned;

                /** The number of non-directories scanned so far, not counting
                 * excluded/unsupported files.  */
                uint64_t num_nondirs_scanned;

                /** The number of bytes of file data detected so far, not
                 * counting excluded/unsupported files.  */
                uint64_t num_bytes_scanned;
        } scan;

        /** Valid on messages
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN,
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN,
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN,
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE,
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS,
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_METADATA,
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_TREE_END, and
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END.
         *
         * Note: most of the time of an extraction operation will be spent
         * extracting file data, and the application will receive
         * ::WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS during this time.  Using @p
         * completed_bytes and @p total_bytes, the application can calculate a
         * percentage complete.  However, there is no way for applications to
         * know which file is currently being extracted.  This is by design
         * because the best way to complete the extraction operation is not
         * necessarily file-by-file.
         */
        struct wimlib_progress_info_extract {

                /** The 1-based index of the image from which files are being
                 * extracted.  */
                uint32_t image;

                /** Extraction flags being used.  */
                uint32_t extract_flags;

                /** If the ::WIMStruct from which the extraction being performed
                 * has a backing file, then this is an absolute path to that
                 * backing file.  Otherwise, this is @c NULL.  */
                const wimlib_tchar *wimfile_name;

                /** Name of the image from which files are being extracted, or
                 * the empty string if the image is unnamed.  */
                const wimlib_tchar *image_name;

                /** Path to the directory or NTFS volume to which the files are
                 * being extracted.  */
                const wimlib_tchar *target;

                /** Reserved.  */
                const wimlib_tchar *reserved;

                /** The number of bytes of file data that will be extracted.  */
                uint64_t total_bytes;

                /** The number of bytes of file data that have been extracted so
                 * far.  This starts at 0 and ends at @p total_bytes.  */
                uint64_t completed_bytes;

                /** The number of file streams that will be extracted.  This
                 * will often be similar to the "number of files", but for
                 * several reasons (hard links, named data streams, empty files,
                 * etc.) it can be different.  */
                uint64_t total_streams;

                /** The number of file streams that have been extracted so far.
                 * This starts at 0 and ends at @p total_streams.  */
                uint64_t completed_streams;

                /** Currently only used for
                 * ::WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN.  */
                uint32_t part_number;

                /** Currently only used for
                 * ::WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN.  */
                uint32_t total_parts;

                /** Currently only used for
                 * ::WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN.  */
                uint8_t guid[WIMLIB_GUID_LEN];

                /** For ::WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE and
                 * ::WIMLIB_PROGRESS_MSG_EXTRACT_METADATA messages, this is the
                 * number of files that have been processed so far.  Once the
                 * corresponding phase of extraction is complete, this value
                 * will be equal to @c end_file_count.  */
                uint64_t current_file_count;

                /** For ::WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE and
                 * ::WIMLIB_PROGRESS_MSG_EXTRACT_METADATA messages, this is
                 * total number of files that will be processed.
                 *
                 * This number is provided for informational purposes only, e.g.
                 * for a progress bar.  This number will not necessarily be
                 * equal to the number of files actually being extracted.  This
                 * is because extraction backends are free to implement an
                 * extraction algorithm that might be more efficient than
                 * processing every file in the "extract file structure" and
                 * "extract file metadata" phases.  For example, the current
                 * implementation of the UNIX extraction backend will create
                 * files on-demand during the "extract file data" phase.
                 * Therefore, when using that particular extraction backend, @p
                 * end_file_count will only include directories and empty files.
                 */
                uint64_t end_file_count;
        } extract;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_RENAME. */
        struct wimlib_progress_info_rename {
                /** Name of the temporary file that the WIM was written to. */
                const wimlib_tchar *from;

                /** Name of the original WIM file to which the temporary file is
                 * being renamed. */
                const wimlib_tchar *to;
        } rename;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_UPDATE_BEGIN_COMMAND and
         * ::WIMLIB_PROGRESS_MSG_UPDATE_END_COMMAND. */
        struct wimlib_progress_info_update {
                /** Pointer to the update command that will be executed or has
                 * just been executed. */
                const struct wimlib_update_command *command;

                /** Number of update commands that have been completed so far.
                 */
                size_t completed_commands;

                /** Number of update commands that are being executed as part of
                 * this call to wimlib_update_image(). */
                size_t total_commands;
        } update;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_VERIFY_INTEGRITY and
         * ::WIMLIB_PROGRESS_MSG_CALC_INTEGRITY. */
        struct wimlib_progress_info_integrity {

                /** The number of bytes in the WIM file that are covered by
                 * integrity checks.  */
                uint64_t total_bytes;

                /** The number of bytes that have been checksummed so far.  This
                 * starts at 0 and ends at @p total_bytes.  */
                uint64_t completed_bytes;

                /** The number of individually checksummed "chunks" the
                 * integrity-checked region is divided into.  */
                uint32_t total_chunks;

                /** The number of chunks that have been checksummed so far.
                 * This starts at 0 and ends at @p total_chunks.  */
                uint32_t completed_chunks;

                /** The size of each individually checksummed "chunk" in the
                 * integrity-checked region.  */
                uint32_t chunk_size;

                /** For ::WIMLIB_PROGRESS_MSG_VERIFY_INTEGRITY messages, this is
                 * the path to the WIM file being checked.  */
                const wimlib_tchar *filename;
        } integrity;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART and
         * ::WIMLIB_PROGRESS_MSG_SPLIT_END_PART. */
        struct wimlib_progress_info_split {
                /** Total size of the original WIM's file and metadata resources
                 * (compressed). */
                uint64_t total_bytes;

                /** Number of bytes of file and metadata resources that have
                 * been copied out of the original WIM so far.  Will be 0
                 * initially, and equal to @p total_bytes at the end. */
                uint64_t completed_bytes;

                /** Number of the split WIM part that is about to be started
                 * (::WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART) or has just been
                 * finished (::WIMLIB_PROGRESS_MSG_SPLIT_END_PART). */
                unsigned cur_part_number;

                /** Total number of split WIM parts that are being written.  */
                unsigned total_parts;

                /** Name of the split WIM part that is about to be started
                 * (::WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART) or has just been
                 * finished (::WIMLIB_PROGRESS_MSG_SPLIT_END_PART).  Since
                 * wimlib v1.7.0, the library user may change this when
                 * receiving ::WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART in order to
                 * cause the next split WIM part to be written to a different
                 * location.  */
                wimlib_tchar *part_name;
        } split;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_REPLACE_FILE_IN_WIM  */
        struct wimlib_progress_info_replace {
                /** Path to the file in the image that is being replaced  */
                const wimlib_tchar *path_in_wim;
        } replace;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_WIMBOOT_EXCLUDE  */
        struct wimlib_progress_info_wimboot_exclude {
                /** Path to the file in the image  */
                const wimlib_tchar *path_in_wim;

                /** Path to which the file is being extracted  */
                const wimlib_tchar *extraction_path;
        } wimboot_exclude;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_UNMOUNT_BEGIN.  */
        struct wimlib_progress_info_unmount {
                /** Path to directory being unmounted  */
                const wimlib_tchar *mountpoint;

                /** Path to WIM file being unmounted  */
                const wimlib_tchar *mounted_wim;

                /** 1-based index of image being unmounted.  */
                uint32_t mounted_image;

                /** Flags that were passed to wimlib_mount_image() when the
                 * mountpoint was set up.  */
                uint32_t mount_flags;

                /** Flags passed to wimlib_unmount_image().  */
                uint32_t unmount_flags;
        } unmount;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_DONE_WITH_FILE.  */
        struct wimlib_progress_info_done_with_file {
                /**
                 * Path to the file whose data has been written to the WIM file,
                 * or is currently being asynchronously compressed in memory,
                 * and therefore is no longer needed by wimlib.
                 *
                 * WARNING: The file data will not actually be accessible in the
                 * WIM file until the WIM file has been completely written.
                 * Ordinarily you should <b>not</b> treat this message as a
                 * green light to go ahead and delete the specified file, since
                 * that would result in data loss if the WIM file cannot be
                 * successfully created for any reason.
                 *
                 * If a file has multiple names (hard links),
                 * ::WIMLIB_PROGRESS_MSG_DONE_WITH_FILE will only be received
                 * for one name.  Also, this message will not be received for
                 * empty files or reparse points (or symbolic links), unless
                 * they have nonempty named data streams.
                 */
                const wimlib_tchar *path_to_file;
        } done_with_file;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_BEGIN_VERIFY_IMAGE and
         * ::WIMLIB_PROGRESS_MSG_END_VERIFY_IMAGE.  */
        struct wimlib_progress_info_verify_image {
                const wimlib_tchar *wimfile;
                uint32_t total_images;
                uint32_t current_image;
        } verify_image;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_VERIFY_STREAMS.  */
        struct wimlib_progress_info_verify_streams {
                const wimlib_tchar *wimfile;
                uint64_t total_streams;
                uint64_t total_bytes;
                uint64_t completed_streams;
                uint64_t completed_bytes;
        } verify_streams;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_TEST_FILE_EXCLUSION.  */
        struct wimlib_progress_info_test_file_exclusion {

                /**
                 * Path to the file for which exclusion is being tested.
                 *
                 * UNIX capture mode:  The path will be a standard relative or
                 * absolute UNIX filesystem path.
                 *
                 * NTFS-3G capture mode:  The path will be given relative to the
                 * root of the NTFS volume, with a leading slash.
                 *
                 * Windows capture mode:  The path will be a Win32 namespace
                 * path to the file.
                 */
                const wimlib_tchar *path;

                /**
                 * Indicates whether the file or directory will be excluded from
                 * capture or not.  This will be <c>false</c> by default.  The
                 * progress function can set this to <c>true</c> if it decides
                 * that the file needs to be excluded.
                 */
                bool will_exclude;
        } test_file_exclusion;

        /** Valid on messages ::WIMLIB_PROGRESS_MSG_HANDLE_ERROR.  */
        struct wimlib_progress_info_handle_error {

                /** Path to the file for which the error occurred, or NULL if
                 * not relevant.  */
                const wimlib_tchar *path;

                /** The wimlib error code associated with the error.  */
                int error_code;

                /**
                 * Indicates whether the error will be ignored or not.  This
                 * will be <c>false</c> by default; the progress function may
                 * set it to <c>true</c>.
                 */
                bool will_ignore;
        } handle_error;
};

/**
 * A user-supplied function that will be called periodically during certain WIM
 * operations.
 *
 * The first argument will be the type of operation that is being performed or
 * is about to be started or has been completed.
 *
 * The second argument will be a pointer to one of a number of structures
 * depending on the first argument.  It may be @c NULL for some message types.
 * Note that although this argument is not @c const, users should not modify it
 * except in explicitly documented cases.
 *
 * The third argument will be a user-supplied value that was provided when
 * registering or specifying the progress function.
 *
 * This function must return one of the ::wimlib_progress_status values.  By
 * default, you should return ::WIMLIB_PROGRESS_STATUS_CONTINUE (0).
 */
typedef enum wimlib_progress_status
        (*wimlib_progress_func_t)(enum wimlib_progress_msg msg_type,
                                  union wimlib_progress_info *info,
                                  void *progctx);

/** @} */
/** @addtogroup G_modifying_wims
 * @{ */

/** An array of these structures is passed to wimlib_add_image_multisource() to
 * specify the sources from which to create a WIM image. */
struct wimlib_capture_source {
        /** Absolute or relative path to a file or directory on the external
         * filesystem to be included in the image. */
        wimlib_tchar *fs_source_path;

        /** Destination path in the image.  To specify the root directory of the
         * image, use ::WIMLIB_WIM_ROOT_PATH.  */
        wimlib_tchar *wim_target_path;

        /** Reserved; set to 0. */
        long reserved;
};

/** Set or unset the "readonly" WIM header flag (<c>WIM_HDR_FLAG_READONLY</c> in
 * Microsoft's documentation), based on the ::wimlib_wim_info.is_marked_readonly
 * member of the @p info parameter.  This is distinct from basic file
 * permissions; this flag can be set on a WIM file that is physically writable.
 *
 * wimlib disallows modifying on-disk WIM files with the readonly flag set.
 * However, wimlib_overwrite() with ::WIMLIB_WRITE_FLAG_IGNORE_READONLY_FLAG
 * will override this --- and in fact, this is necessary to set the readonly
 * flag persistently on an existing WIM file.
 */
#define WIMLIB_CHANGE_READONLY_FLAG             0x00000001

/** Set the GUID (globally unique identifier) of the WIM file to the value
 * specified in ::wimlib_wim_info.guid of the @p info parameter. */
#define WIMLIB_CHANGE_GUID                      0x00000002

/** Change the bootable image of the WIM to the value specified in
 * ::wimlib_wim_info.boot_index of the @p info parameter.  */
#define WIMLIB_CHANGE_BOOT_INDEX                0x00000004

/** Change the <c>WIM_HDR_FLAG_RP_FIX</c> flag of the WIM file to the value
 * specified in ::wimlib_wim_info.has_rpfix of the @p info parameter.  This flag
 * generally indicates whether an image in the WIM has been captured with
 * reparse-point fixups enabled.  wimlib also treats this flag as specifying
 * whether to do reparse-point fixups by default when capturing or applying WIM
 * images.  */
#define WIMLIB_CHANGE_RPFIX_FLAG                0x00000008

/** @} */

/** @addtogroup G_wim_information  */

/** @{ */

/**
 * General information about a WIM file.
 *
 * This info can also be requested for a ::WIMStruct that does not have a
 * backing file.  In this case, fields that only make sense given a backing file
 * are set to default values.
 */
struct wimlib_wim_info {

        /** The globally unique identifier for this WIM.  (Note: all parts of a
         * split WIM normally have identical GUIDs.)  */
        uint8_t guid[WIMLIB_GUID_LEN];

        /** The number of images in this WIM file.  */
        uint32_t image_count;

        /** The 1-based index of the bootable image in this WIM file, or 0 if no
         * image is bootable.  */
        uint32_t boot_index;

        /** The version of the WIM file format used in this WIM file.  */
        uint32_t wim_version;

        /** The default compression chunk size of resources in this WIM file.
         */
        uint32_t chunk_size;

        /** For split WIMs, the 1-based index of this part within the split WIM;
         * otherwise 1.  */
        uint16_t part_number;

        /** For split WIMs, the total number of parts in the split WIM;
         * otherwise 1.  */
        uint16_t total_parts;

        /** The default compression type of resources in this WIM file, as one
         * of the ::wimlib_compression_type constants.  */
        int32_t compression_type;

        /** The size of this WIM file in bytes, excluding the XML data and
         * integrity table.  */
        uint64_t total_bytes;

        /** 1 iff this WIM file has an integrity table.  */
        uint32_t has_integrity_table : 1;

        /** 1 iff this info struct is for a ::WIMStruct that has a backing file.
         */
        uint32_t opened_from_file : 1;

        /** 1 iff this WIM file is considered readonly for any reason (e.g. the
         * "readonly" header flag is set, or this is part of a split WIM, or
         * filesystem permissions deny writing)  */
        uint32_t is_readonly : 1;

        /** 1 iff the "reparse point fix" flag is set in this WIM's header  */
        uint32_t has_rpfix : 1;

        /** 1 iff the "readonly" flag is set in this WIM's header  */
        uint32_t is_marked_readonly : 1;

        /** 1 iff the "spanned" flag is set in this WIM's header  */
        uint32_t spanned : 1;

        /** 1 iff the "write in progress" flag is set in this WIM's header  */
        uint32_t write_in_progress : 1;

        /** 1 iff the "metadata only" flag is set in this WIM's header  */
        uint32_t metadata_only : 1;

        /** 1 iff the "resource only" flag is set in this WIM's header  */
        uint32_t resource_only : 1;

        /** 1 iff this WIM file is pipable (see ::WIMLIB_WRITE_FLAG_PIPABLE).  */
        uint32_t pipable : 1;
        uint32_t reserved_flags : 22;
        uint32_t reserved[9];
};

/**
 * Information about a "blob", which is a fixed length sequence of binary data.
 * Each nonempty stream of each file in a WIM image is associated with a blob.
 * Blobs are deduplicated within a WIM file.
 *
 * TODO: this struct needs to be renamed, and perhaps made into a union since
 * there are several cases.  I'll try to list them below:
 *
 * 1. The blob is "missing", meaning that it is referenced by hash but not
 *    actually present in the WIM file.  In this case we only know the
 *    sha1_hash.  This case can only occur with wimlib_iterate_dir_tree(), never
 *    wimlib_iterate_lookup_table().
 *
 * 2. Otherwise we know the sha1_hash, the uncompressed_size, the
 *    reference_count, and the is_metadata flag.  In addition:
 *
 *    A. If the blob is located in a non-solid WIM resource, then we also know
 *       the compressed_size and offset.
 *
 *    B. If the blob is located in a solid WIM resource, then we also know the
 *       offset, raw_resource_offset_in_wim, raw_resource_compressed_size, and
 *       raw_resource_uncompressed_size.  But the "offset" is actually the
 *       offset in the uncompressed solid resource rather than the offset from
 *       the beginning of the WIM file.
 *
 *    C. If the blob is *not* located in any type of WIM resource, then we don't
 *       know any additional information.
 *
 * Unknown or irrelevant fields are left zeroed.
 */
struct wimlib_resource_entry {

        /** If this blob is not missing, then this is the uncompressed size of
         * this blob in bytes.  */
        uint64_t uncompressed_size;

        /** If this blob is located in a non-solid WIM resource, then this is
         * the compressed size of that resource.  */
        uint64_t compressed_size;

        /** If this blob is located in a non-solid WIM resource, then this is
         * the offset of that resource within the WIM file containing it.  If
         * this blob is located in a solid WIM resource, then this is the offset
         * of this blob within that solid resource when uncompressed.  */
        uint64_t offset;

        /** The SHA-1 message digest of the blob's uncompressed contents.  */
        uint8_t sha1_hash[20];

        /** If this blob is located in a WIM resource, then this is the part
         * number of the WIM file containing it.  */
        uint32_t part_number;

        /** If this blob is not missing, then this is the number of times this
         * blob is referenced over all images in the WIM.  This number is not
         * guaranteed to be correct.  */
        uint32_t reference_count;

        /** 1 iff this blob is located in a non-solid compressed WIM resource.
         */
        uint32_t is_compressed : 1;

        /** 1 iff this blob contains the metadata for an image.  */
        uint32_t is_metadata : 1;

        uint32_t is_free : 1;
        uint32_t is_spanned : 1;

        /** 1 iff a blob with this hash was not found in the blob lookup table
         * of the ::WIMStruct.  This normally implies a missing call to
         * wimlib_reference_resource_files() or wimlib_reference_resources(). */
        uint32_t is_missing : 1;

        /** 1 iff this blob is located in a solid resource.  */
        uint32_t packed : 1;

        uint32_t reserved_flags : 26;

        /** If this blob is located in a solid WIM resource, then this is the
         * offset of that solid resource within the WIM file containing it.  */
        uint64_t raw_resource_offset_in_wim;

        /** If this blob is located in a solid WIM resource, then this is the
         * compressed size of that solid resource.  */
        uint64_t raw_resource_compressed_size;

        /** If this blob is located in a solid WIM resource, then this is the
         * uncompressed size of that solid resource.  */
        uint64_t raw_resource_uncompressed_size;

        uint64_t reserved[1];
};

/**
 * Information about a stream of a particular file in the WIM.
 *
 * Normally, only WIM images captured from NTFS filesystems will have multiple
 * streams per file.  In practice, this is a rarely used feature of the
 * filesystem.
 *
 * TODO: the library now explicitly tracks stream types, which allows it to have
 * multiple unnamed streams (e.g. both a reparse point stream and unnamed data
 * stream).  However, this isn't yet exposed by wimlib_iterate_dir_tree().
 */
struct wimlib_stream_entry {

        /** Name of the stream, or NULL if the stream is unnamed.  */
        const wimlib_tchar *stream_name;

        /** Info about this stream's data, such as its hash and size if known.*/
        struct wimlib_resource_entry resource;

        uint64_t reserved[4];
};

/**
 * Since wimlib v1.9.1: an object ID, which is an extra piece of metadata that
 * may be associated with a file on NTFS filesystems.  See:
 * https://msdn.microsoft.com/en-us/library/windows/desktop/aa363997(v=vs.85).aspx
 */
struct wimlib_object_id {
        uint8_t object_id[WIMLIB_GUID_LEN];
        uint8_t birth_volume_id[WIMLIB_GUID_LEN];
        uint8_t birth_object_id[WIMLIB_GUID_LEN];
        uint8_t domain_id[WIMLIB_GUID_LEN];
};

/** Structure passed to the wimlib_iterate_dir_tree() callback function.
 * Roughly, the information about a "file" in the WIM image --- but really a
 * directory entry ("dentry") because hard links are allowed.  The
 * hard_link_group_id field can be used to distinguish actual file inodes.  */
struct wimlib_dir_entry {
        /** Name of the file, or NULL if this file is unnamed.  Only the root
         * directory of an image will be unnamed.  */
        const wimlib_tchar *filename;

        /** 8.3 name (or "DOS name", or "short name") of this file; or NULL if
         * this file has no such name.  */
        const wimlib_tchar *dos_name;

        /** Full path to this file within the image.  Path separators will be
         * ::WIMLIB_WIM_PATH_SEPARATOR.  */
        const wimlib_tchar *full_path;

        /** Depth of this directory entry, where 0 is the root, 1 is the root's
         * children, ..., etc. */
        size_t depth;

        /** Pointer to the security descriptor for this file, in Windows
         * SECURITY_DESCRIPTOR_RELATIVE format, or NULL if this file has no
         * security descriptor.  */
        const char *security_descriptor;

        /** Size of the above security descriptor, in bytes.  */
        size_t security_descriptor_size;

#define WIMLIB_FILE_ATTRIBUTE_READONLY            0x00000001
#define WIMLIB_FILE_ATTRIBUTE_HIDDEN              0x00000002
#define WIMLIB_FILE_ATTRIBUTE_SYSTEM              0x00000004
#define WIMLIB_FILE_ATTRIBUTE_DIRECTORY           0x00000010
#define WIMLIB_FILE_ATTRIBUTE_ARCHIVE             0x00000020
#define WIMLIB_FILE_ATTRIBUTE_DEVICE              0x00000040
#define WIMLIB_FILE_ATTRIBUTE_NORMAL              0x00000080
#define WIMLIB_FILE_ATTRIBUTE_TEMPORARY           0x00000100
#define WIMLIB_FILE_ATTRIBUTE_SPARSE_FILE         0x00000200
#define WIMLIB_FILE_ATTRIBUTE_REPARSE_POINT       0x00000400
#define WIMLIB_FILE_ATTRIBUTE_COMPRESSED          0x00000800
#define WIMLIB_FILE_ATTRIBUTE_OFFLINE             0x00001000
#define WIMLIB_FILE_ATTRIBUTE_NOT_CONTENT_INDEXED 0x00002000
#define WIMLIB_FILE_ATTRIBUTE_ENCRYPTED           0x00004000
#define WIMLIB_FILE_ATTRIBUTE_VIRTUAL             0x00010000
        /** File attributes, such as whether the file is a directory or not.
         * These are the "standard" Windows FILE_ATTRIBUTE_* values, although in
         * wimlib.h they are defined as WIMLIB_FILE_ATTRIBUTE_* for convenience
         * on other platforms.  */
        uint32_t attributes;

#define WIMLIB_REPARSE_TAG_RESERVED_ZERO        0x00000000
#define WIMLIB_REPARSE_TAG_RESERVED_ONE         0x00000001
#define WIMLIB_REPARSE_TAG_MOUNT_POINT          0xA0000003
#define WIMLIB_REPARSE_TAG_HSM                  0xC0000004
#define WIMLIB_REPARSE_TAG_HSM2                 0x80000006
#define WIMLIB_REPARSE_TAG_DRIVER_EXTENDER      0x80000005
#define WIMLIB_REPARSE_TAG_SIS                  0x80000007
#define WIMLIB_REPARSE_TAG_DFS                  0x8000000A
#define WIMLIB_REPARSE_TAG_DFSR                 0x80000012
#define WIMLIB_REPARSE_TAG_FILTER_MANAGER       0x8000000B
#define WIMLIB_REPARSE_TAG_WOF                  0x80000017
#define WIMLIB_REPARSE_TAG_SYMLINK              0xA000000C
        /** If the file is a reparse point (FILE_ATTRIBUTE_REPARSE_POINT set in
         * the attributes), this will give the reparse tag.  This tells you
         * whether the reparse point is a symbolic link, junction point, or some
         * other, more unusual kind of reparse point.  */
        uint32_t reparse_tag;

        /** Number of links to this file's inode (hard links).
         *
         * Currently, this will always be 1 for directories.  However, it can be
         * greater than 1 for nondirectory files.  */
        uint32_t num_links;

        /** Number of named data streams this file has.  Normally 0.  */
        uint32_t num_named_streams;

        /** A unique identifier for this file's inode.  However, as a special
         * case, if the inode only has a single link (@p num_links == 1), this
         * value may be 0.
         *
         * Note: if a WIM image is captured from a filesystem, this value is not
         * guaranteed to be the same as the original number of the inode on the
         * filesystem.  */
        uint64_t hard_link_group_id;

        /** Time this file was created.  */
        struct timespec creation_time;

        /** Time this file was last written to.  */
        struct timespec last_write_time;

        /** Time this file was last accessed.  */
        struct timespec last_access_time;

        /** The UNIX user ID of this file.  This is a wimlib extension.
         *
         * This field is only valid if @p unix_mode != 0.  */
        uint32_t unix_uid;

        /** The UNIX group ID of this file.  This is a wimlib extension.
         *
         * This field is only valid if @p unix_mode != 0.  */
        uint32_t unix_gid;

        /** The UNIX mode of this file.  This is a wimlib extension.
         *
         * If this field is 0, then @p unix_uid, @p unix_gid, @p unix_mode, and
         * @p unix_rdev are all unknown (fields are not present in the WIM
         * image).  */
        uint32_t unix_mode;

        /** The UNIX device ID (major and minor number) of this file.  This is a
         * wimlib extension.
         *
         * This field is only valid if @p unix_mode != 0.  */
        uint32_t unix_rdev;

        /* The object ID of this file, if any.  Only valid if
         * object_id.object_id is not all zeroes.  */
        struct wimlib_object_id object_id;

        uint64_t reserved[6];

        /**
         * Variable-length array of streams that make up this file.
         *
         * The first entry will always exist and will correspond to the unnamed
         * data stream (default file contents), so it will have <c>stream_name
         * == NULL</c>.  Alternatively, for reparse point files, the first entry
         * will correspond to the reparse data stream.  Alternatively, for
         * encrypted files, the first entry will correspond to the encrypted
         * data.
         *
         * Then, following the first entry, there be @p num_named_streams
         * additional entries that specify the named data streams, if any, each
         * of which will have <c>stream_name != NULL</c>.
         */
        struct wimlib_stream_entry streams[];
};

/**
 * Type of a callback function to wimlib_iterate_dir_tree().  Must return 0 on
 * success.
 */
typedef int (*wimlib_iterate_dir_tree_callback_t)(const struct wimlib_dir_entry *dentry,
                                                  void *user_ctx);

/**
 * Type of a callback function to wimlib_iterate_lookup_table().  Must return 0
 * on success.
 */
typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resource_entry *resource,
                                                      void *user_ctx);

/** For wimlib_iterate_dir_tree(): Iterate recursively on children rather than
 * just on the specified path. */
#define WIMLIB_ITERATE_DIR_TREE_FLAG_RECURSIVE 0x00000001

/** For wimlib_iterate_dir_tree(): Don't iterate on the file or directory
 * itself; only its children (in the case of a non-empty directory) */
#define WIMLIB_ITERATE_DIR_TREE_FLAG_CHILDREN  0x00000002

/** Return ::WIMLIB_ERR_RESOURCE_NOT_FOUND if any file data blobs needed to fill
 * in the ::wimlib_resource_entry's for the iteration cannot be found in the
 * blob lookup table of the ::WIMStruct.  The default behavior without this flag
 * is to fill in the @ref wimlib_resource_entry::sha1_hash "sha1_hash" and set
 * the @ref wimlib_resource_entry::is_missing "is_missing" flag.  */
#define WIMLIB_ITERATE_DIR_TREE_FLAG_RESOURCES_NEEDED  0x00000004


/** @} */
/** @addtogroup G_modifying_wims
 * @{ */

/** UNIX-like systems only: Directly capture an NTFS volume rather than a
 * generic directory.  This requires that wimlib was compiled with support for
 * libntfs-3g.
 *
 * This flag cannot be combined with ::WIMLIB_ADD_FLAG_DEREFERENCE or
 * ::WIMLIB_ADD_FLAG_UNIX_DATA.
 *
 * Do not use this flag on Windows, where wimlib already supports all
 * Windows-native filesystems, including NTFS, through the Windows APIs.  */
#define WIMLIB_ADD_FLAG_NTFS                    0x00000001

/** Follow symbolic links when scanning the directory tree.  Currently only
 * supported on UNIX-like systems.  */
#define WIMLIB_ADD_FLAG_DEREFERENCE             0x00000002

/** Call the progress function with the message
 * ::WIMLIB_PROGRESS_MSG_SCAN_DENTRY when each directory or file has been
 * scanned.  */
#define WIMLIB_ADD_FLAG_VERBOSE                 0x00000004

/** Mark the image being added as the bootable image of the WIM.  This flag is
 * valid only for wimlib_add_image() and wimlib_add_image_multisource().
 *
 * Note that you can also change the bootable image of a WIM using
 * wimlib_set_wim_info().
 *
 * Note: ::WIMLIB_ADD_FLAG_BOOT does something different from, and independent
 * from, ::WIMLIB_ADD_FLAG_WIMBOOT.  */
#define WIMLIB_ADD_FLAG_BOOT                    0x00000008

/** UNIX-like systems only: Store the UNIX owner, group, mode, and device ID
 * (major and minor number) of each file.  In addition, capture special files
 * such as device nodes and FIFOs.  See the documentation for the
 * <b>--unix-data</b> option to <b>wimcapture</b> for more information.  */
#define WIMLIB_ADD_FLAG_UNIX_DATA               0x00000010

/** Do not capture security descriptors.  Only has an effect in NTFS-3G capture
 * mode, or in Windows native builds.  */
#define WIMLIB_ADD_FLAG_NO_ACLS                 0x00000020

/** Fail immediately if the full security descriptor of any file or directory
 * cannot be accessed.  Only has an effect in Windows native builds.  The
 * default behavior without this flag is to first try omitting the SACL from the
 * security descriptor, then to try omitting the security descriptor entirely.
 */
#define WIMLIB_ADD_FLAG_STRICT_ACLS             0x00000040

/** Call the progress function with the message
 * ::WIMLIB_PROGRESS_MSG_SCAN_DENTRY when a directory or file is excluded from
 * capture.  This is a subset of the messages provided by
 * ::WIMLIB_ADD_FLAG_VERBOSE.  */
#define WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE         0x00000080

/** Reparse-point fixups:  Modify absolute symbolic links (and junctions, in the
 * case of Windows) that point inside the directory being captured to instead be
 * absolute relative to the directory being captured.
 *
 * Without this flag, the default is to do reparse-point fixups if
 * <c>WIM_HDR_FLAG_RP_FIX</c> is set in the WIM header or if this is the first
 * image being added.  */
#define WIMLIB_ADD_FLAG_RPFIX                   0x00000100

/** Don't do reparse point fixups.  See ::WIMLIB_ADD_FLAG_RPFIX.  */
#define WIMLIB_ADD_FLAG_NORPFIX                 0x00000200

/** Do not automatically exclude unsupported files or directories from capture,
 * such as encrypted files in NTFS-3G capture mode, or device files and FIFOs on
 * UNIX-like systems when not also using ::WIMLIB_ADD_FLAG_UNIX_DATA.  Instead,
 * fail with ::WIMLIB_ERR_UNSUPPORTED_FILE when such a file is encountered.  */
#define WIMLIB_ADD_FLAG_NO_UNSUPPORTED_EXCLUDE  0x00000400

/**
 * Automatically select a capture configuration appropriate for capturing
 * filesystems containing Windows operating systems.  For example,
 * <c>/pagefile.sys</c> and <c>"/System Volume Information"</c> will be
 * excluded.
 *
 * When this flag is specified, the corresponding @p config parameter (for
 * wimlib_add_image()) or member (for wimlib_update_image()) must be @c NULL.
 * Otherwise, ::WIMLIB_ERR_INVALID_PARAM will be returned.
 *
 * Note that the default behavior--- that is, when neither
 * ::WIMLIB_ADD_FLAG_WINCONFIG nor ::WIMLIB_ADD_FLAG_WIMBOOT is specified and @p
 * config is @c NULL--- is to use no capture configuration, meaning that no
 * files are excluded from capture.
 */
#define WIMLIB_ADD_FLAG_WINCONFIG               0x00000800

/**
 * Capture image as "WIMBoot compatible".  In addition, if no capture
 * configuration file is explicitly specified use the capture configuration file
 * <c>$SOURCE/Windows/System32/WimBootCompress.ini</c> if it exists, where
 * <c>$SOURCE</c> is the directory being captured; or, if a capture
 * configuration file is explicitly specified, use it and also place it at
 * <c>/Windows/System32/WimBootCompress.ini</c> in the WIM image.
 *
 * This flag does not, by itself, change the compression type or chunk size.
 * Before writing the WIM file, you may wish to set the compression format to
 * be the same as that used by WIMGAPI and DISM:
 *
 * \code
 *      wimlib_set_output_compression_type(wim, WIMLIB_COMPRESSION_TYPE_XPRESS);
 *      wimlib_set_output_chunk_size(wim, 4096);
 * \endcode
 *
 * However, "WIMBoot" also works with other XPRESS chunk sizes as well as LZX
 * with 32768 byte chunks.
 *
 * Note: ::WIMLIB_ADD_FLAG_WIMBOOT does something different from, and
 * independent from, ::WIMLIB_ADD_FLAG_BOOT.
 *
 * Since wimlib v1.8.3, ::WIMLIB_ADD_FLAG_WIMBOOT also causes offline WIM-backed
 * files to be added as the "real" files rather than as their reparse points,
 * provided that their data is already present in the WIM.  This feature can be
 * useful when updating a backing WIM file in an "offline" state.
 */
#define WIMLIB_ADD_FLAG_WIMBOOT                 0x00001000

/**
 * If the add command involves adding a non-directory file to a location at
 * which there already exists a nondirectory file in the image, issue
 * ::WIMLIB_ERR_INVALID_OVERLAY instead of replacing the file.  This was the
 * default behavior before wimlib v1.7.0.
 */
#define WIMLIB_ADD_FLAG_NO_REPLACE              0x00002000

/**
 * Send ::WIMLIB_PROGRESS_MSG_TEST_FILE_EXCLUSION messages to the progress
 * function.
 *
 * Note: This method for file exclusions is independent from the capture
 * configuration file mechanism.
 */
#define WIMLIB_ADD_FLAG_TEST_FILE_EXCLUSION     0x00004000

/**
 * Since wimlib v1.9.0: create a temporary filesystem snapshot of the source
 * directory and add the files from it.  Currently, this option is only
 * supported on Windows, where it uses the Volume Shadow Copy Service (VSS).
 * Using this option, you can create a consistent backup of the system volume of
 * a running Windows system without running into problems with locked files.
 * For the VSS snapshot to be successfully created, your application must be run
 * as an Administrator, and it cannot be run in WoW64 mode (i.e. if Windows is
 * 64-bit, then your application must be 64-bit as well).
 */
#define WIMLIB_ADD_FLAG_SNAPSHOT                0x00008000

/**
 * Since wimlib v1.9.0: permit the library to discard file paths after the
 * initial scan.  If the application won't use
 * ::WIMLIB_WRITE_FLAG_SEND_DONE_WITH_FILE_MESSAGES while writing the WIM
 * archive, this flag can be used to allow the library to enable optimizations
 * such as opening files by inode number rather than by path.  Currently this
 * only makes a difference on Windows.
 */
#define WIMLIB_ADD_FLAG_FILE_PATHS_UNNEEDED     0x00010000

/** @} */
/** @addtogroup G_modifying_wims
 * @{ */

/** Do not issue an error if the path to delete does not exist. */
#define WIMLIB_DELETE_FLAG_FORCE                        0x00000001

/** Delete the file or directory tree recursively; if not specified, an error is
 * issued if the path to delete is a directory. */
#define WIMLIB_DELETE_FLAG_RECURSIVE                    0x00000002

/** @} */
/** @addtogroup G_modifying_wims
 * @{ */

/**
 * If a single image is being exported, mark it bootable in the destination WIM.
 * Alternatively, if ::WIMLIB_ALL_IMAGES is specified as the image to export,
 * the image in the source WIM (if any) that is marked as bootable is also
 * marked as bootable in the destination WIM.
 */
#define WIMLIB_EXPORT_FLAG_BOOT                         0x00000001

/** Give the exported image(s) no names.  Avoids problems with image name
 * collisions.
 */
#define WIMLIB_EXPORT_FLAG_NO_NAMES                     0x00000002

/** Give the exported image(s) no descriptions.  */
#define WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS              0x00000004

/** This advises the library that the program is finished with the source
 * WIMStruct and will not attempt to access it after the call to
 * wimlib_export_image(), with the exception of the call to wimlib_free().  */
#define WIMLIB_EXPORT_FLAG_GIFT                         0x00000008

/**
 * Mark each exported image as WIMBoot-compatible.
 *
 * Note: by itself, this does change the destination WIM's compression type, nor
 * does it add the file @c \\Windows\\System32\\WimBootCompress.ini in the WIM
 * image.  Before writing the destination WIM, it's recommended to do something
 * like:
 *
 * \code
 *      wimlib_set_output_compression_type(wim, WIMLIB_COMPRESSION_TYPE_XPRESS);
 *      wimlib_set_output_chunk_size(wim, 4096);
 *      wimlib_add_tree(wim, image, L"myconfig.ini",
 *                      L"\\Windows\\System32\\WimBootCompress.ini", 0);
 * \endcode
 */
#define WIMLIB_EXPORT_FLAG_WIMBOOT                      0x00000010

/** @} */
/** @addtogroup G_extracting_wims
 * @{ */

/** Extract the image directly to an NTFS volume rather than a generic directory.
 * This mode is only available if wimlib was compiled with libntfs-3g support;
 * if not, ::WIMLIB_ERR_UNSUPPORTED will be returned.  In this mode, the
 * extraction target will be interpreted as the path to an NTFS volume image (as
 * a regular file or block device) rather than a directory.  It will be opened
 * using libntfs-3g, and the image will be extracted to the NTFS filesystem's
 * root directory.  Note: this flag cannot be used when wimlib_extract_image()
 * is called with ::WIMLIB_ALL_IMAGES as the @p image, nor can it be used with
 * wimlib_extract_paths() when passed multiple paths.  */
#define WIMLIB_EXTRACT_FLAG_NTFS                        0x00000001

/** UNIX-like systems only:  Extract special UNIX data captured with
 * ::WIMLIB_ADD_FLAG_UNIX_DATA.  This flag cannot be combined with
 * ::WIMLIB_EXTRACT_FLAG_NTFS.  */
#define WIMLIB_EXTRACT_FLAG_UNIX_DATA                   0x00000020

/** Do not extract security descriptors.  This flag cannot be combined with
 * ::WIMLIB_EXTRACT_FLAG_STRICT_ACLS.  */
#define WIMLIB_EXTRACT_FLAG_NO_ACLS                     0x00000040

/**
 * Fail immediately if the full security descriptor of any file or directory
 * cannot be set exactly as specified in the WIM image.  On Windows, the default
 * behavior without this flag when wimlib does not have permission to set the
 * correct security descriptor is to fall back to setting the security
 * descriptor with the SACL omitted, then with the DACL omitted, then with the
 * owner omitted, then not at all.  This flag cannot be combined with
 * ::WIMLIB_EXTRACT_FLAG_NO_ACLS.
 */
#define WIMLIB_EXTRACT_FLAG_STRICT_ACLS                 0x00000080

/**
 * This is the extraction equivalent to ::WIMLIB_ADD_FLAG_RPFIX.  This forces
 * reparse-point fixups on, so absolute symbolic links or junction points will
 * be fixed to be absolute relative to the actual extraction root.  Reparse-
 * point fixups are done by default for wimlib_extract_image() and
 * wimlib_extract_image_from_pipe() if <c>WIM_HDR_FLAG_RP_FIX</c> is set in the
 * WIM header.  This flag cannot be combined with ::WIMLIB_EXTRACT_FLAG_NORPFIX.
 */
#define WIMLIB_EXTRACT_FLAG_RPFIX                       0x00000100

/** Force reparse-point fixups on extraction off, regardless of the state of the
 * WIM_HDR_FLAG_RP_FIX flag in the WIM header.  This flag cannot be combined
 * with ::WIMLIB_EXTRACT_FLAG_RPFIX.  */
#define WIMLIB_EXTRACT_FLAG_NORPFIX                     0x00000200

/** For wimlib_extract_paths() and wimlib_extract_pathlist() only:  Extract the
 * paths, each of which must name a regular file, to standard output.  */
#define WIMLIB_EXTRACT_FLAG_TO_STDOUT                   0x00000400

/**
 * Instead of ignoring files and directories with names that cannot be
 * represented on the current platform (note: Windows has more restrictions on
 * filenames than POSIX-compliant systems), try to replace characters or append
 * junk to the names so that they can be extracted in some form.
 *
 * Note: this flag is unlikely to have any effect when extracting a WIM image
 * that was captured on Windows.
 */
#define WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES   0x00000800

/**
 * On Windows, when there exist two or more files with the same case insensitive
 * name but different case sensitive names, try to extract them all by appending
 * junk to the end of them, rather than arbitrarily extracting only one.
 *
 * Note: this flag is unlikely to have any effect when extracting a WIM image
 * that was captured on Windows.
 */
#define WIMLIB_EXTRACT_FLAG_ALL_CASE_CONFLICTS          0x00001000

/** Do not ignore failure to set timestamps on extracted files.  This flag
 * currently only has an effect when extracting to a directory on UNIX-like
 * systems.  */
#define WIMLIB_EXTRACT_FLAG_STRICT_TIMESTAMPS           0x00002000

/** Do not ignore failure to set short names on extracted files.  This flag
 * currently only has an effect on Windows.  */
#define WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES          0x00004000

/** Do not ignore failure to extract symbolic links and junctions due to
 * permissions problems.  This flag currently only has an effect on Windows.  By
 * default, such failures are ignored since the default configuration of Windows
 * only allows the Administrator to create symbolic links.  */
#define WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS             0x00008000

/**
 * For wimlib_extract_paths() and wimlib_extract_pathlist() only:  Treat the
 * paths to extract as wildcard patterns ("globs") which may contain the
 * wildcard characters @c ? and @c *.  The @c ? character matches any
 * non-path-separator character, whereas the @c * character matches zero or more
 * non-path-separator characters.  Consequently, each glob may match zero or
 * more actual paths in the WIM image.
 *
 * By default, if a glob does not match any files, a warning but not an error
 * will be issued.  This is the case even if the glob did not actually contain
 * wildcard characters.  Use ::WIMLIB_EXTRACT_FLAG_STRICT_GLOB to get an error
 * instead.
 */
#define WIMLIB_EXTRACT_FLAG_GLOB_PATHS                  0x00040000

/** In combination with ::WIMLIB_EXTRACT_FLAG_GLOB_PATHS, causes an error
 * (::WIMLIB_ERR_PATH_DOES_NOT_EXIST) rather than a warning to be issued when
 * one of the provided globs did not match a file.  */
#define WIMLIB_EXTRACT_FLAG_STRICT_GLOB                 0x00080000

/**
 * Do not extract Windows file attributes such as readonly, hidden, etc.
 *
 * This flag has an effect on Windows as well as in the NTFS-3G extraction mode.
 */
#define WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES               0x00100000

/**
 * For wimlib_extract_paths() and wimlib_extract_pathlist() only:  Do not
 * preserve the directory structure of the archive when extracting --- that is,
 * place each extracted file or directory tree directly in the target directory.
 * The target directory will still be created if it does not already exist.
 */
#define WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE   0x00200000

/**
 * Windows only: Extract files as "pointers" back to the WIM archive.
 *
 * The effects of this option are fairly complex.  See the documentation for the
 * <b>--wimboot</b> option of <b>wimapply</b> for more information.
 */
#define WIMLIB_EXTRACT_FLAG_WIMBOOT                     0x00400000

/**
 * Since wimlib v1.8.2 and Windows-only: compress the extracted files using
 * System Compression, when possible.  This only works on either Windows 10 or
 * later, or on an older Windows to which Microsoft's wofadk.sys driver has been
 * added.  Several different compression formats may be used with System
 * Compression; this particular flag selects the XPRESS compression format with
 * 4096 byte chunks.
 */
#define WIMLIB_EXTRACT_FLAG_COMPACT_XPRESS4K            0x01000000

/** Like ::WIMLIB_EXTRACT_FLAG_COMPACT_XPRESS4K, but use XPRESS compression with
 * 8192 byte chunks.  */
#define WIMLIB_EXTRACT_FLAG_COMPACT_XPRESS8K            0x02000000

/** Like ::WIMLIB_EXTRACT_FLAG_COMPACT_XPRESS4K, but use XPRESS compression with
 * 16384 byte chunks.  */
#define WIMLIB_EXTRACT_FLAG_COMPACT_XPRESS16K           0x04000000

/** Like ::WIMLIB_EXTRACT_FLAG_COMPACT_XPRESS4K, but use LZX compression with
 * 32768 byte chunks.  */
#define WIMLIB_EXTRACT_FLAG_COMPACT_LZX                 0x08000000

/** @} */
/** @addtogroup G_mounting_wim_images
 * @{ */

/** Mount the WIM image read-write rather than the default of read-only. */
#define WIMLIB_MOUNT_FLAG_READWRITE                     0x00000001

/** Enable FUSE debugging by passing the @c -d option to @c fuse_main().  */
#define WIMLIB_MOUNT_FLAG_DEBUG                         0x00000002

/** Do not allow accessing named data streams in the mounted WIM image.  */
#define WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_NONE         0x00000004

/** Access named data streams in the mounted WIM image through extended file
 * attributes named "user.X", where X is the name of a data stream.  This is the
 * default mode.  */
#define WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR        0x00000008

/** Access named data streams in the mounted WIM image by specifying the file
 * name, a colon, then the name of the data stream.  */
#define WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS      0x00000010

/** Use UNIX metadata if available in the WIM image.  See
 * ::WIMLIB_ADD_FLAG_UNIX_DATA.  */
#define WIMLIB_MOUNT_FLAG_UNIX_DATA                     0x00000020

/** Allow other users to see the mounted filesystem.  This passes the @c
 * allow_other option to fuse_main().  */
#define WIMLIB_MOUNT_FLAG_ALLOW_OTHER                   0x00000040

/** @} */
/** @addtogroup G_creating_and_opening_wims
 * @{ */

/** Verify the WIM contents against the WIM's integrity table, if present.  The
 * integrity table stores checksums for the raw data of the WIM file, divided
 * into fixed size chunks.  Verification will compute checksums and compare them
 * with the stored values.  If there are any mismatches, then
 * ::WIMLIB_ERR_INTEGRITY will be issued.  If the WIM file does not contain an
 * integrity table, then this flag has no effect.  */
#define WIMLIB_OPEN_FLAG_CHECK_INTEGRITY                0x00000001

/** Issue an error (::WIMLIB_ERR_IS_SPLIT_WIM) if the WIM is part of a split
 * WIM.  Software can provide this flag for convenience if it explicitly does
 * not want to support split WIMs.  */
#define WIMLIB_OPEN_FLAG_ERROR_IF_SPLIT                 0x00000002

/** Check if the WIM is writable and issue an error
 * (::WIMLIB_ERR_WIM_IS_READONLY) if it is not.  A WIM is considered writable
 * only if it is writable at the filesystem level, does not have the
 * <c>WIM_HDR_FLAG_READONLY</c> flag set in its header, and is not part of a
 * spanned set.  It is not required to provide this flag before attempting to
 * make changes to the WIM, but with this flag you get an error immediately
 * rather than potentially much later, when wimlib_overwrite() is finally
 * called.  */
#define WIMLIB_OPEN_FLAG_WRITE_ACCESS                   0x00000004

/** @} */
/** @addtogroup G_mounting_wim_images
 * @{ */

/** Provide ::WIMLIB_WRITE_FLAG_CHECK_INTEGRITY when committing the WIM image.
 * Ignored if ::WIMLIB_UNMOUNT_FLAG_COMMIT not also specified.  */
#define WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY             0x00000001

/** Commit changes to the read-write mounted WIM image.
 * If this flag is not specified, changes will be discarded.  */
#define WIMLIB_UNMOUNT_FLAG_COMMIT                      0x00000002

/** Provide ::WIMLIB_WRITE_FLAG_REBUILD when committing the WIM image.
 * Ignored if ::WIMLIB_UNMOUNT_FLAG_COMMIT not also specified.  */
#define WIMLIB_UNMOUNT_FLAG_REBUILD                     0x00000004

/** Provide ::WIMLIB_WRITE_FLAG_RECOMPRESS when committing the WIM image.
 * Ignored if ::WIMLIB_UNMOUNT_FLAG_COMMIT not also specified.  */
#define WIMLIB_UNMOUNT_FLAG_RECOMPRESS                  0x00000008

/**
 * In combination with ::WIMLIB_UNMOUNT_FLAG_COMMIT for a read-write mounted WIM
 * image, forces all file descriptors to the open WIM image to be closed before
 * committing it.
 *
 * Without ::WIMLIB_UNMOUNT_FLAG_COMMIT or with a read-only mounted WIM image,
 * this flag has no effect.
 */
#define WIMLIB_UNMOUNT_FLAG_FORCE                       0x00000010

/** In combination with ::WIMLIB_UNMOUNT_FLAG_COMMIT for a read-write mounted
 * WIM image, causes the modified image to be committed to the WIM file as a
 * new, unnamed image appended to the archive.  The original image in the WIM
 * file will be unmodified.  */
#define WIMLIB_UNMOUNT_FLAG_NEW_IMAGE                   0x00000020

/** @} */
/** @addtogroup G_modifying_wims
 * @{ */

/** Send ::WIMLIB_PROGRESS_MSG_UPDATE_BEGIN_COMMAND and
 * ::WIMLIB_PROGRESS_MSG_UPDATE_END_COMMAND messages.  */
#define WIMLIB_UPDATE_FLAG_SEND_PROGRESS                0x00000001

/** @} */
/** @addtogroup G_writing_and_overwriting_wims
 * @{ */

/**
 * Include an integrity table in the resulting WIM file.
 *
 * For ::WIMStruct's created with wimlib_open_wim(), the default behavior is to
 * include an integrity table if and only if one was present before.  For
 * ::WIMStruct's created with wimlib_create_new_wim(), the default behavior is
 * to not include an integrity table.
 */
#define WIMLIB_WRITE_FLAG_CHECK_INTEGRITY               0x00000001

/**
 * Do not include an integrity table in the resulting WIM file.  This is the
 * default behavior, unless the ::WIMStruct was created by opening a WIM with an
 * integrity table.
 */
#define WIMLIB_WRITE_FLAG_NO_CHECK_INTEGRITY            0x00000002

/**
 * Write the WIM as "pipable".  After writing a WIM with this flag specified,
 * images from it can be applied directly from a pipe using
 * wimlib_extract_image_from_pipe().  See the documentation for the
 * <b>--pipable</b> option of <b>wimcapture</b> for more information.  Beware:
 * WIMs written with this flag will not be compatible with Microsoft's software.
 *
 * For ::WIMStruct's created with wimlib_open_wim(), the default behavior is to
 * write the WIM as pipable if and only if it was pipable before.  For
 * ::WIMStruct's created with wimlib_create_new_wim(), the default behavior is
 * to write the WIM as non-pipable.
 */
#define WIMLIB_WRITE_FLAG_PIPABLE                       0x00000004

/**
 * Do not write the WIM as "pipable".  This is the default behavior, unless the
 * ::WIMStruct was created by opening a pipable WIM.
 */
#define WIMLIB_WRITE_FLAG_NOT_PIPABLE                   0x00000008

/**
 * When writing data to the WIM file, recompress it, even if the data is already
 * available in the desired compressed form (for example, in a WIM file from
 * which an image has been exported using wimlib_export_image()).
 *
 * ::WIMLIB_WRITE_FLAG_RECOMPRESS can be used to recompress with a higher
 * compression ratio for the same compression type and chunk size.  Simply using
 * the default compression settings may suffice for this, especially if the WIM
 * file was created using another program/library that may not use as
 * sophisticated compression algorithms.  Or,
 * wimlib_set_default_compression_level() can be called beforehand to set an
 * even higher compression level than the default.
 *
 * If the WIM contains solid resources, then ::WIMLIB_WRITE_FLAG_RECOMPRESS can
 * be used in combination with ::WIMLIB_WRITE_FLAG_SOLID to prevent any solid
 * resources from being re-used.  Otherwise, solid resources are re-used
 * somewhat more liberally than normal compressed resources.
 *
 * ::WIMLIB_WRITE_FLAG_RECOMPRESS does <b>not</b> cause recompression of data
 * that would not otherwise be written.  For example, a call to
 * wimlib_overwrite() with ::WIMLIB_WRITE_FLAG_RECOMPRESS will not, by itself,
 * cause already-existing data in the WIM file to be recompressed.  To force the
 * WIM file to be fully rebuilt and recompressed, combine
 * ::WIMLIB_WRITE_FLAG_RECOMPRESS with ::WIMLIB_WRITE_FLAG_REBUILD.
 */
#define WIMLIB_WRITE_FLAG_RECOMPRESS                    0x00000010

/**
 * Immediately before closing the WIM file, sync its data to disk.
 *
 * This flag forces the function to wait until the data is safely on disk before
 * returning success.  Otherwise, modern operating systems tend to cache data
 * for some time (in some cases, 30+ seconds) before actually writing it to
 * disk, even after reporting to the application that the writes have succeeded.
 *
 * wimlib_overwrite() will set this flag automatically if it decides to
 * overwrite the WIM file via a temporary file instead of in-place.  This is
 * necessary on POSIX systems; it will, for example, avoid problems with delayed
 * allocation on ext4.
 */
#define WIMLIB_WRITE_FLAG_FSYNC                         0x00000020

/**
 * For wimlib_overwrite(): rebuild the entire WIM file, even if it otherwise
 * could be updated in-place by appending to it.  Any data that existed in the
 * original WIM file but is not actually needed by any of the remaining images
 * will not be included.  This can free up space left over after previous
 * in-place modifications to the WIM file.
 *
 * This flag can be combined with ::WIMLIB_WRITE_FLAG_RECOMPRESS to force all
 * data to be recompressed.  Otherwise, compressed data is re-used if possible.
 *
 * wimlib_write() ignores this flag.
 */
#define WIMLIB_WRITE_FLAG_REBUILD                       0x00000040

/**
 * For wimlib_overwrite(): override the default behavior after one or more calls
 * to wimlib_delete_image(), which is to rebuild the entire WIM file.  With this
 * flag, only minimal changes to correctly remove the image from the WIM file
 * will be taken.  This can be much faster, but it will result in the WIM file
 * getting larger rather than smaller.
 *
 * wimlib_write() ignores this flag.
 */
#define WIMLIB_WRITE_FLAG_SOFT_DELETE                   0x00000080

/**
 * For wimlib_overwrite(), allow overwriting the WIM file even if the readonly
 * flag (<c>WIM_HDR_FLAG_READONLY</c>) is set in the WIM header.  This can be
 * used following a call to wimlib_set_wim_info() with the
 * ::WIMLIB_CHANGE_READONLY_FLAG flag to actually set the readonly flag on the
 * on-disk WIM file.
 *
 * wimlib_write() ignores this flag.
 */
#define WIMLIB_WRITE_FLAG_IGNORE_READONLY_FLAG          0x00000100

/**
 * Do not include file data already present in other WIMs.  This flag can be
 * used to write a "delta" WIM after the WIM files on which the delta is to be
 * based were referenced with wimlib_reference_resource_files() or
 * wimlib_reference_resources().
 */
#define WIMLIB_WRITE_FLAG_SKIP_EXTERNAL_WIMS            0x00000200

/** Deprecated; this flag should not be used outside of the library itself.  */
#define WIMLIB_WRITE_FLAG_STREAMS_OK                    0x00000400

/**
 * For wimlib_write(), retain the WIM's GUID instead of generating a new one.
 *
 * wimlib_overwrite() sets this by default, since the WIM remains, logically,
 * the same file.
 */
#define WIMLIB_WRITE_FLAG_RETAIN_GUID                   0x00000800

/**
 * Concatenate files and compress them together, rather than compress each file
 * independently.  This is also known as creating a "solid archive".  This tends
 * to produce a better compression ratio at the cost of much slower random
 * access.
 *
 * WIM files created with this flag are only compatible with wimlib v1.6.0 or
 * later, WIMGAPI Windows 8 or later, and DISM Windows 8.1 or later.  WIM files
 * created with this flag use a different version number in their header (3584
 * instead of 68864) and are also called "ESD files".
 *
 * Note that providing this flag does not affect the "append by default"
 * behavior of wimlib_overwrite().  In other words, wimlib_overwrite() with just
 * ::WIMLIB_WRITE_FLAG_SOLID can be used to append solid-compressed data to a
 * WIM file that originally did not contain any solid-compressed data.  But if
 * you instead want to rebuild and recompress an entire WIM file in solid mode,
 * then also provide ::WIMLIB_WRITE_FLAG_REBUILD and
 * ::WIMLIB_WRITE_FLAG_RECOMPRESS.
 *
 * Currently, new solid resources will, by default, be written using LZMS
 * compression with 64 MiB (67108864 byte) chunks.  Use
 * wimlib_set_output_pack_compression_type() and/or
 * wimlib_set_output_pack_chunk_size() to change this.  This is independent of
 * the WIM's main compression type and chunk size; you can have a WIM that
 * nominally uses LZX compression and 32768 byte chunks but actually contains
 * LZMS-compressed solid resources, for example.  However, if including solid
 * resources, I suggest that you set the WIM's main compression type to LZMS as
 * well, either by creating the WIM with
 * ::wimlib_create_new_wim(::WIMLIB_COMPRESSION_TYPE_LZMS, ...) or by calling
 * ::wimlib_set_output_compression_type(..., ::WIMLIB_COMPRESSION_TYPE_LZMS).
 *
 * This flag will be set by default when writing or overwriting a WIM file that
 * either already contains solid resources, or has had solid resources exported
 * into it and the WIM's main compression type is LZMS.
 */
#define WIMLIB_WRITE_FLAG_SOLID                         0x00001000

/**
 * Send ::WIMLIB_PROGRESS_MSG_DONE_WITH_FILE messages while writing the WIM
 * file.  This is only needed in the unusual case that the library user needs to
 * know exactly when wimlib has read each file for the last time.
 */
#define WIMLIB_WRITE_FLAG_SEND_DONE_WITH_FILE_MESSAGES  0x00002000

/**
 * Do not consider content similarity when arranging file data for solid
 * compression.  Providing this flag will typically worsen the compression
 * ratio, so only provide this flag if you know what you are doing.
 */
#define WIMLIB_WRITE_FLAG_NO_SOLID_SORT                 0x00004000

/**
 * Since wimlib v1.8.3 and for wimlib_overwrite() only: <b>unsafely</b> compact
 * the WIM file in-place, without appending.  Existing resources are shifted
 * down to fill holes and new resources are appended as needed.  The WIM file is
 * truncated to its final size, which may shrink the on-disk file.  <b>This
 * operation cannot be safely interrupted.  If the operation is interrupted,
 * then the WIM file will be corrupted, and it may be impossible (or at least
 * very difficult) to recover any data from it.  Users of this flag are expected
 * to know what they are doing and assume responsibility for any data corruption
 * that may result.</b>
 *
 * If the WIM file cannot be compacted in-place because of its structure, its
 * layout, or other requested write parameters, then wimlib_overwrite() fails
 * with ::WIMLIB_ERR_COMPACTION_NOT_POSSIBLE, and the caller may wish to retry
 * the operation without this flag.
 */
#define WIMLIB_WRITE_FLAG_UNSAFE_COMPACT                0x00008000

/** @} */
/** @addtogroup G_general
 * @{ */

/** Deprecated; no longer has any effect.  The library now always assumes UTF-8
 * encoding on non-Windows systems.  */
#define WIMLIB_INIT_FLAG_ASSUME_UTF8                    0x00000001

/** Windows-only: do not attempt to acquire additional privileges (currently
 * SeBackupPrivilege, SeRestorePrivilege, SeSecurityPrivilege,
 * SeTakeOwnershipPrivilege, and SeManageVolumePrivilege) when initializing the
 * library.  This flag is intended for the case where the calling program
 * manages these privileges itself.  Note: by default, no error is issued if
 * privileges cannot be acquired, although related errors may be reported later,
 * depending on if the operations performed actually require additional
 * privileges or not.  */
#define WIMLIB_INIT_FLAG_DONT_ACQUIRE_PRIVILEGES        0x00000002

/** Windows only:  If ::WIMLIB_INIT_FLAG_DONT_ACQUIRE_PRIVILEGES not specified,
 * return ::WIMLIB_ERR_INSUFFICIENT_PRIVILEGES if privileges that may be needed
 * to read all possible data and metadata for a capture operation could not be
 * acquired.  Can be combined with ::WIMLIB_INIT_FLAG_STRICT_APPLY_PRIVILEGES.
 */
#define WIMLIB_INIT_FLAG_STRICT_CAPTURE_PRIVILEGES      0x00000004

/** Windows only:  If ::WIMLIB_INIT_FLAG_DONT_ACQUIRE_PRIVILEGES not specified,
 * return ::WIMLIB_ERR_INSUFFICIENT_PRIVILEGES if privileges that may be needed
 * to restore all possible data and metadata for an apply operation could not be
 * acquired.  Can be combined with ::WIMLIB_INIT_FLAG_STRICT_CAPTURE_PRIVILEGES.
 */
#define WIMLIB_INIT_FLAG_STRICT_APPLY_PRIVILEGES        0x00000008

/** Default to interpreting WIM paths case sensitively (default on UNIX-like
 * systems).  */
#define WIMLIB_INIT_FLAG_DEFAULT_CASE_SENSITIVE         0x00000010

/** Default to interpreting WIM paths case insensitively (default on Windows).
 * This does not apply to mounted images.  */
#define WIMLIB_INIT_FLAG_DEFAULT_CASE_INSENSITIVE       0x00000020

/** @} */
/** @addtogroup G_nonstandalone_wims
 * @{ */

/** For wimlib_reference_resource_files(), enable shell-style filename globbing.
 * Ignored by wimlib_reference_resources().  */
#define WIMLIB_REF_FLAG_GLOB_ENABLE             0x00000001

/** For wimlib_reference_resource_files(), issue an error
 * (::WIMLIB_ERR_GLOB_HAD_NO_MATCHES) if a glob did not match any files.  The
 * default behavior without this flag is to issue no error at that point, but
 * then attempt to open the glob as a literal path, which of course will fail
 * anyway if no file exists at that path.  No effect if
 * ::WIMLIB_REF_FLAG_GLOB_ENABLE is not also specified.  Ignored by
 * wimlib_reference_resources().  */
#define WIMLIB_REF_FLAG_GLOB_ERR_ON_NOMATCH     0x00000002

/** @} */
/** @addtogroup G_modifying_wims
 * @{ */

/** The specific type of update to perform. */
enum wimlib_update_op {
        /** Add a new file or directory tree to the image.  */
        WIMLIB_UPDATE_OP_ADD = 0,

        /** Delete a file or directory tree from the image.  */
        WIMLIB_UPDATE_OP_DELETE = 1,

        /** Rename a file or directory tree in the image.  */
        WIMLIB_UPDATE_OP_RENAME = 2,
};

/** Data for a ::WIMLIB_UPDATE_OP_ADD operation. */
struct wimlib_add_command {
        /** Filesystem path to the file or directory tree to add.  */
        wimlib_tchar *fs_source_path;

        /** Destination path in the image.  To specify the root directory of the
         * image, use ::WIMLIB_WIM_ROOT_PATH.  */
        wimlib_tchar *wim_target_path;

        /** Path to capture configuration file to use, or @c NULL if not
         * specified.  */
        wimlib_tchar *config_file;

        /** Bitwise OR of WIMLIB_ADD_FLAG_* flags. */
        int add_flags;
};

/** Data for a ::WIMLIB_UPDATE_OP_DELETE operation. */
struct wimlib_delete_command {

        /** The path to the file or directory within the image to delete.  */
        wimlib_tchar *wim_path;

        /** Bitwise OR of WIMLIB_DELETE_FLAG_* flags.  */
        int delete_flags;
};

/** Data for a ::WIMLIB_UPDATE_OP_RENAME operation. */
struct wimlib_rename_command {

        /** The path to the source file or directory within the image.  */
        wimlib_tchar *wim_source_path;

        /** The path to the destination file or directory within the image.  */
        wimlib_tchar *wim_target_path;

        /** Reserved; set to 0.  */
        int rename_flags;
};

/** Specification of an update to perform on a WIM image. */
struct wimlib_update_command {

        enum wimlib_update_op op;

        union {
                struct wimlib_add_command add;
                struct wimlib_delete_command delete_; /* Underscore is for C++
                                                         compatibility.  */
                struct wimlib_rename_command rename;
        };
};

/** @} */
/** @addtogroup G_general
 * @{ */

/**
 * Possible values of the error code returned by many functions in wimlib.
 *
 * See the documentation for each wimlib function to see specifically what error
 * codes can be returned by a given function, and what they mean.
 */
enum wimlib_error_code {
        WIMLIB_ERR_SUCCESS                            = 0,
        WIMLIB_ERR_ALREADY_LOCKED                     = 1,
        WIMLIB_ERR_DECOMPRESSION                      = 2,
        WIMLIB_ERR_FUSE                               = 6,
        WIMLIB_ERR_GLOB_HAD_NO_MATCHES                = 8,
        WIMLIB_ERR_IMAGE_COUNT                        = 10,
        WIMLIB_ERR_IMAGE_NAME_COLLISION               = 11,
        WIMLIB_ERR_INSUFFICIENT_PRIVILEGES            = 12,
        WIMLIB_ERR_INTEGRITY                          = 13,
        WIMLIB_ERR_INVALID_CAPTURE_CONFIG             = 14,
        WIMLIB_ERR_INVALID_CHUNK_SIZE                 = 15,
        WIMLIB_ERR_INVALID_COMPRESSION_TYPE           = 16,
        WIMLIB_ERR_INVALID_HEADER                     = 17,
        WIMLIB_ERR_INVALID_IMAGE                      = 18,
        WIMLIB_ERR_INVALID_INTEGRITY_TABLE            = 19,
        WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY         = 20,
        WIMLIB_ERR_INVALID_METADATA_RESOURCE          = 21,
        WIMLIB_ERR_INVALID_OVERLAY                    = 23,
        WIMLIB_ERR_INVALID_PARAM                      = 24,
        WIMLIB_ERR_INVALID_PART_NUMBER                = 25,
        WIMLIB_ERR_INVALID_PIPABLE_WIM                = 26,
        WIMLIB_ERR_INVALID_REPARSE_DATA               = 27,
        WIMLIB_ERR_INVALID_RESOURCE_HASH              = 28,
        WIMLIB_ERR_INVALID_UTF16_STRING               = 30,
        WIMLIB_ERR_INVALID_UTF8_STRING                = 31,
        WIMLIB_ERR_IS_DIRECTORY                       = 32,
        WIMLIB_ERR_IS_SPLIT_WIM                       = 33,
        WIMLIB_ERR_LINK                               = 35,
        WIMLIB_ERR_METADATA_NOT_FOUND                 = 36,
        WIMLIB_ERR_MKDIR                              = 37,
        WIMLIB_ERR_MQUEUE                             = 38,
        WIMLIB_ERR_NOMEM                              = 39,
        WIMLIB_ERR_NOTDIR                             = 40,
        WIMLIB_ERR_NOTEMPTY                           = 41,
        WIMLIB_ERR_NOT_A_REGULAR_FILE                 = 42,
        WIMLIB_ERR_NOT_A_WIM_FILE                     = 43,
        WIMLIB_ERR_NOT_PIPABLE                        = 44,
        WIMLIB_ERR_NO_FILENAME                        = 45,
        WIMLIB_ERR_NTFS_3G                            = 46,
        WIMLIB_ERR_OPEN                               = 47,
        WIMLIB_ERR_OPENDIR                            = 48,
        WIMLIB_ERR_PATH_DOES_NOT_EXIST                = 49,
        WIMLIB_ERR_READ                               = 50,
        WIMLIB_ERR_READLINK                           = 51,
        WIMLIB_ERR_RENAME                             = 52,
        WIMLIB_ERR_REPARSE_POINT_FIXUP_FAILED         = 54,
        WIMLIB_ERR_RESOURCE_NOT_FOUND                 = 55,
        WIMLIB_ERR_RESOURCE_ORDER                     = 56,
        WIMLIB_ERR_SET_ATTRIBUTES                     = 57,
        WIMLIB_ERR_SET_REPARSE_DATA                   = 58,
        WIMLIB_ERR_SET_SECURITY                       = 59,
        WIMLIB_ERR_SET_SHORT_NAME                     = 60,
        WIMLIB_ERR_SET_TIMESTAMPS                     = 61,
        WIMLIB_ERR_SPLIT_INVALID                      = 62,
        WIMLIB_ERR_STAT                               = 63,
        WIMLIB_ERR_UNEXPECTED_END_OF_FILE             = 65,
        WIMLIB_ERR_UNICODE_STRING_NOT_REPRESENTABLE   = 66,
        WIMLIB_ERR_UNKNOWN_VERSION                    = 67,
        WIMLIB_ERR_UNSUPPORTED                        = 68,
        WIMLIB_ERR_UNSUPPORTED_FILE                   = 69,
        WIMLIB_ERR_WIM_IS_READONLY                    = 71,
        WIMLIB_ERR_WRITE                              = 72,
        WIMLIB_ERR_XML                                = 73,
        WIMLIB_ERR_WIM_IS_ENCRYPTED                   = 74,
        WIMLIB_ERR_WIMBOOT                            = 75,
        WIMLIB_ERR_ABORTED_BY_PROGRESS                = 76,
        WIMLIB_ERR_UNKNOWN_PROGRESS_STATUS            = 77,
        WIMLIB_ERR_MKNOD                              = 78,
        WIMLIB_ERR_MOUNTED_IMAGE_IS_BUSY              = 79,
        WIMLIB_ERR_NOT_A_MOUNTPOINT                   = 80,
        WIMLIB_ERR_NOT_PERMITTED_TO_UNMOUNT           = 81,
        WIMLIB_ERR_FVE_LOCKED_VOLUME                  = 82,
        WIMLIB_ERR_UNABLE_TO_READ_CAPTURE_CONFIG      = 83,
        WIMLIB_ERR_WIM_IS_INCOMPLETE                  = 84,
        WIMLIB_ERR_COMPACTION_NOT_POSSIBLE            = 85,
        WIMLIB_ERR_IMAGE_HAS_MULTIPLE_REFERENCES      = 86,
        WIMLIB_ERR_DUPLICATE_EXPORTED_IMAGE           = 87,
        WIMLIB_ERR_CONCURRENT_MODIFICATION_DETECTED   = 88,
        WIMLIB_ERR_SNAPSHOT_FAILURE                   = 89,
};


/** Used to indicate no image or an invalid image. */
#define WIMLIB_NO_IMAGE         0

/** Used to specify all images in the WIM. */
#define WIMLIB_ALL_IMAGES       (-1)

/** @}  */

/**
 * @ingroup G_modifying_wims
 *
 * Append an empty image to a ::WIMStruct.
 *
 * The new image will initially contain no files or directories, although if
 * written without further modifications, then a root directory will be created
 * automatically for it.
 *
 * After calling this function, you can use wimlib_update_image() to add files
 * to the new image.  This gives you more control over making the new image
 * compared to calling wimlib_add_image() or wimlib_add_image_multisource().
 *
 * @param wim
 *      Pointer to the ::WIMStruct to which to add the image.
 * @param name
 *      Name to give the new image.  If @c NULL or empty, the new image is given
 *      no name.  If nonempty, it must specify a name that does not already
 *      exist in @p wim.
 * @param new_idx_ret
 *      If non-<c>NULL</c>, the index of the newly added image is returned in
 *      this location.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_IMAGE_NAME_COLLISION
 *      The WIM already contains an image with the requested name.
 */
extern int
wimlib_add_empty_image(WIMStruct *wim,
                       const wimlib_tchar *name,
                       int *new_idx_ret);

/**
 * @ingroup G_modifying_wims
 *
 * Add an image to a ::WIMStruct from an on-disk directory tree or NTFS volume.
 *
 * The directory tree or NTFS volume is scanned immediately to load the dentry
 * tree into memory, and file metadata is read.  However, actual file data may
 * not be read until the ::WIMStruct is persisted to disk using wimlib_write()
 * or wimlib_overwrite().
 *
 * See the documentation for the @b wimlib-imagex program for more information
 * about the "normal" capture mode versus the NTFS capture mode (entered by
 * providing the flag ::WIMLIB_ADD_FLAG_NTFS).
 *
 * Note that no changes are committed to disk until wimlib_write() or
 * wimlib_overwrite() is called.
 *
 * @param wim
 *      Pointer to the ::WIMStruct to which to add the image.
 * @param source
 *      A path to a directory or unmounted NTFS volume that will be captured as
 *      a WIM image.
 * @param name
 *      Name to give the new image.  If @c NULL or empty, the new image is given
 *      no name.  If nonempty, it must specify a name that does not already
 *      exist in @p wim.
 * @param config_file
 *      Path to capture configuration file, or @c NULL.  This file may specify,
 *      among other things, which files to exclude from capture.  See the
 *      documentation for <b>wimcapture</b> (<b>--config</b> option) for details
 *      of the file format.  If @c NULL, the default capture configuration will
 *      be used.  Ordinarily, the default capture configuration will result in
 *      no files being excluded from capture purely based on name; however, the
 *      ::WIMLIB_ADD_FLAG_WINCONFIG and ::WIMLIB_ADD_FLAG_WIMBOOT flags modify
 *      the default.
 * @param add_flags
 *      Bitwise OR of flags prefixed with WIMLIB_ADD_FLAG.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * This function is implemented by calling wimlib_add_empty_image(), then
 * calling wimlib_update_image() with a single "add" command, so any error code
 * returned by wimlib_add_empty_image() may be returned, as well as any error
 * codes returned by wimlib_update_image() other than ones documented as only
 * being returned specifically by an update involving delete or rename commands.
 *
 * If a progress function is registered with @p wim, then it will receive the
 * messages ::WIMLIB_PROGRESS_MSG_SCAN_BEGIN and ::WIMLIB_PROGRESS_MSG_SCAN_END.
 * In addition, if ::WIMLIB_ADD_FLAG_VERBOSE is specified in @p add_flags, it
 * will receive ::WIMLIB_PROGRESS_MSG_SCAN_DENTRY.
 */
extern int
wimlib_add_image(WIMStruct *wim,
                 const wimlib_tchar *source,
                 const wimlib_tchar *name,
                 const wimlib_tchar *config_file,
                 int add_flags);

/**
 * @ingroup G_modifying_wims
 *
 * This function is equivalent to wimlib_add_image() except it allows for
 * multiple sources to be combined into a single WIM image.  This is done by
 * specifying the @p sources and @p num_sources parameters instead of the @p
 * source parameter of wimlib_add_image().  The rest of the parameters are the
 * same as wimlib_add_image().  See the documentation for <b>wimcapture</b> for
 * full details on how this mode works.
 */
extern int
wimlib_add_image_multisource(WIMStruct *wim,
                             const struct wimlib_capture_source *sources,
                             size_t num_sources,
                             const wimlib_tchar *name,
                             const wimlib_tchar *config_file,
                             int add_flags);

/**
 * @ingroup G_modifying_wims
 *
 * Add the file or directory tree at @p fs_source_path on the filesystem to the
 * location @p wim_target_path within the specified @p image of the @p wim.
 *
 * This just builds an appropriate ::wimlib_add_command and passes it to
 * wimlib_update_image().
 */
extern int
wimlib_add_tree(WIMStruct *wim, int image,
                const wimlib_tchar *fs_source_path,
                const wimlib_tchar *wim_target_path, int add_flags);

/**
 * @ingroup G_creating_and_opening_wims
 *
 * Create a ::WIMStruct which initially contains no images and is not backed by
 * an on-disk file.
 *
 * @param ctype
 *      The "output compression type" to assign to the ::WIMStruct.  This is the
 *      compression type that will be used if the ::WIMStruct is later persisted
 *      to an on-disk file using wimlib_write().
 *      <br/>
 *      This choice is not necessarily final.  If desired, it can still be
 *      changed at any time before wimlib_write() is called, using
 *      wimlib_set_output_compression_type().  In addition, if you wish to use a
 *      non-default compression chunk size, then you will need to call
 *      wimlib_set_output_chunk_size().
 * @param wim_ret
 *      On success, a pointer to the new ::WIMStruct is written to the memory
 *      location pointed to by this parameter.  This ::WIMStruct must be freed
 *      using using wimlib_free() when finished with it.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INVALID_COMPRESSION_TYPE
 *      @p ctype was not a supported compression type.
 * @retval ::WIMLIB_ERR_NOMEM
 *      Insufficient memory to allocate a new ::WIMStruct.
 */
extern int
wimlib_create_new_wim(enum wimlib_compression_type ctype, WIMStruct **wim_ret);

/**
 * @ingroup G_modifying_wims
 *
 * Delete an image, or all images, from a ::WIMStruct.
 *
 * Note that no changes are committed to disk until wimlib_write() or
 * wimlib_overwrite() is called.
 *
 * @param wim
 *      Pointer to the ::WIMStruct from which to delete the image.
 * @param image
 *      The 1-based index of the image to delete, or ::WIMLIB_ALL_IMAGES to
 *      delete all images.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p image does not exist in the WIM.
 *
 * This function can additionally return ::WIMLIB_ERR_DECOMPRESSION,
 * ::WIMLIB_ERR_INVALID_METADATA_RESOURCE, ::WIMLIB_ERR_METADATA_NOT_FOUND,
 * ::WIMLIB_ERR_READ, or ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE, all of which
 * indicate failure (for different reasons) to read the metadata resource for an
 * image that needed to be deleted.
 *
 * If this function fails when @p image was ::WIMLIB_ALL_IMAGES, then it's
 * possible that some but not all of the images were deleted.
 */
extern int
wimlib_delete_image(WIMStruct *wim, int image);

/**
 * @ingroup G_modifying_wims
 *
 * Delete the @p path from the specified @p image of the @p wim.
 *
 * This just builds an appropriate ::wimlib_delete_command and passes it to
 * wimlib_update_image().
 */
extern int
wimlib_delete_path(WIMStruct *wim, int image,
                   const wimlib_tchar *path, int delete_flags);

/**
 * @ingroup G_modifying_wims
 *
 * Export an image, or all images, from a ::WIMStruct into another ::WIMStruct.
 *
 * Specifically, if the destination ::WIMStruct contains <tt>n</tt> images, then
 * the source image(s) will be appended, in order, starting at destination index
 * <tt>n + 1</tt>.  By default, all image metadata will be exported verbatim,
 * but certain changes can be made by passing appropriate parameters.
 *
 * wimlib_export_image() is only an in-memory operation; no changes are
 * committed to disk until wimlib_write() or wimlib_overwrite() is called.
 *
 * A limitation of the current implementation of wimlib_export_image() is that
 * the directory tree of a source or destination image cannot be updated
 * following an export until one of the two images has been freed from memory.
 *
 * @param src_wim
 *      The WIM from which to export the images, specified as a pointer to the
 *      ::WIMStruct for a standalone WIM file, a delta WIM file, or part 1 of a
 *      split WIM.  In the case of a WIM file that is not standalone, this
 *      ::WIMStruct must have had any needed external resources previously
 *      referenced using wimlib_reference_resources() or
 *      wimlib_reference_resource_files().
 * @param src_image
 *      The 1-based index of the image from @p src_wim to export, or
 *      ::WIMLIB_ALL_IMAGES.
 * @param dest_wim
 *      The ::WIMStruct to which to export the images.
 * @param dest_name
 *      For single-image exports, the name to give the exported image in @p
 *      dest_wim.  If left @c NULL, the name from @p src_wim is used.  For
 *      ::WIMLIB_ALL_IMAGES exports, this parameter must be left @c NULL; in
 *      that case, the names are all taken from @p src_wim.  This parameter is
 *      overridden by ::WIMLIB_EXPORT_FLAG_NO_NAMES.
 * @param dest_description
 *      For single-image exports, the description to give the exported image in
 *      the new WIM file.  If left @c NULL, the description from @p src_wim is
 *      used.  For ::WIMLIB_ALL_IMAGES exports, this parameter must be left @c
 *      NULL; in that case, the description are all taken from @p src_wim.  This
 *      parameter is overridden by ::WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS.
 * @param export_flags
 *      Bitwise OR of flags prefixed with WIMLIB_EXPORT_FLAG.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_DUPLICATE_EXPORTED_IMAGE
 *      One or more of the source images had already been exported into the
 *      destination WIM.
 * @retval ::WIMLIB_ERR_IMAGE_NAME_COLLISION
 *      One or more of the names being given to an exported image was already in
 *      use in the destination WIM.
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p src_image does not exist in @p src_wim.
 * @retval ::WIMLIB_ERR_METADATA_NOT_FOUND
 *      At least one of @p src_wim and @p dest_wim does not contain image
 *      metadata; for example, one of them represents a non-first part of a
 *      split WIM.
 * @retval ::WIMLIB_ERR_RESOURCE_NOT_FOUND
 *      A file data blob that needed to be exported could not be found in the
 *      blob lookup table of @p src_wim.  See @ref G_nonstandalone_wims.
 *
 * This function can additionally return ::WIMLIB_ERR_DECOMPRESSION,
 * ::WIMLIB_ERR_INVALID_METADATA_RESOURCE, ::WIMLIB_ERR_METADATA_NOT_FOUND,
 * ::WIMLIB_ERR_READ, or ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE, all of which
 * indicate failure (for different reasons) to read the metadata resource for an
 * image in @p src_wim that needed to be exported.
 */
extern int
wimlib_export_image(WIMStruct *src_wim, int src_image,
                    WIMStruct *dest_wim,
                    const wimlib_tchar *dest_name,
                    const wimlib_tchar *dest_description,
                    int export_flags);

/**
 * @ingroup G_extracting_wims
 *
 * Extract an image, or all images, from a ::WIMStruct.
 *
 * The exact behavior of how wimlib extracts files from a WIM image is
 * controllable by the @p extract_flags parameter, but there also are
 * differences depending on the platform (UNIX-like vs Windows).  See the
 * documentation for <b>wimapply</b> for more information, including about the
 * NTFS-3G extraction mode.
 *
 * @param wim
 *      The WIM from which to extract the image(s), specified as a pointer to the
 *      ::WIMStruct for a standalone WIM file, a delta WIM file, or part 1 of a
 *      split WIM.  In the case of a WIM file that is not standalone, this
 *      ::WIMStruct must have had any needed external resources previously
 *      referenced using wimlib_reference_resources() or
 *      wimlib_reference_resource_files().
 * @param image
 *      The 1-based index of the image to extract, or ::WIMLIB_ALL_IMAGES to
 *      extract all images.  Note: ::WIMLIB_ALL_IMAGES is unsupported in NTFS-3G
 *      extraction mode.
 * @param target
 *      A null-terminated string which names the location to which the image(s)
 *      will be extracted.  By default, this is interpreted as a path to a
 *      directory.  Alternatively, if ::WIMLIB_EXTRACT_FLAG_NTFS is specified in
 *      @p extract_flags, then this is interpreted as a path to an unmounted
 *      NTFS volume.
 * @param extract_flags
 *      Bitwise OR of flags prefixed with WIMLIB_EXTRACT_FLAG.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_DECOMPRESSION
 *      The WIM file contains invalid compressed data.
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p image does not exist in @p wim.
 * @retval ::WIMLIB_ERR_INVALID_METADATA_RESOURCE
 *      The metadata for an image to extract was invalid.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      The extraction flags were invalid; more details may be found in the
 *      documentation for the specific extraction flags that were specified.  Or
 *      @p target was @c NULL or an empty string, or @p wim was @c NULL.
 * @retval ::WIMLIB_ERR_INVALID_RESOURCE_HASH
 *      The data of a file that needed to be extracted was corrupt.
 * @retval ::WIMLIB_ERR_LINK
 *      Failed to create a symbolic link or a hard link.
 * @retval ::WIMLIB_ERR_METADATA_NOT_FOUND
 *      @p wim does not contain image metadata; for example, it represents a
 *      non-first part of a split WIM.
 * @retval ::WIMLIB_ERR_MKDIR
 *      Failed create a directory.
 * @retval ::WIMLIB_ERR_NTFS_3G
 *      libntfs-3g reported that a problem occurred while writing to the NTFS
 *      volume.
 * @retval ::WIMLIB_ERR_OPEN
 *      Could not create a file, or failed to open an already-extracted file.
 * @retval ::WIMLIB_ERR_READ
 *      Failed to read data from the WIM.
 * @retval ::WIMLIB_ERR_READLINK
 *      Failed to determine the target of a symbolic link in the WIM.
 * @retval ::WIMLIB_ERR_REPARSE_POINT_FIXUP_FAILED
 *      Failed to fix the target of an absolute symbolic link (e.g. if the
 *      target would have exceeded the maximum allowed length).  (Only if
 *      reparse data was supported by the extraction mode and
 *      ::WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS was specified in @p
 *      extract_flags.)
 * @retval ::WIMLIB_ERR_RESOURCE_NOT_FOUND
 *      A file data blob that needed to be extracted could not be found in the
 *      blob lookup table of @p wim.  See @ref G_nonstandalone_wims.
 * @retval ::WIMLIB_ERR_SET_ATTRIBUTES
 *      Failed to set attributes on a file.
 * @retval ::WIMLIB_ERR_SET_REPARSE_DATA
 *      Failed to set reparse data on a file (only if reparse data was supported
 *      by the extraction mode).
 * @retval ::WIMLIB_ERR_SET_SECURITY
 *      Failed to set security descriptor on a file.
 * @retval ::WIMLIB_ERR_SET_SHORT_NAME
 *      Failed to set the short name of a file.
 * @retval ::WIMLIB_ERR_SET_TIMESTAMPS
 *      Failed to set timestamps on a file.
 * @retval ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE
 *      Unexpected end-of-file occurred when reading data from the WIM.
 * @retval ::WIMLIB_ERR_UNSUPPORTED
 *      A requested extraction flag, or the data or metadata that must be
 *      extracted to support it, is unsupported in the build and configuration
 *      of wimlib, or on the current platform or extraction mode or target
 *      volume.  Flags affected by this include ::WIMLIB_EXTRACT_FLAG_NTFS,
 *      ::WIMLIB_EXTRACT_FLAG_UNIX_DATA, ::WIMLIB_EXTRACT_FLAG_STRICT_ACLS,
 *      ::WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES,
 *      ::WIMLIB_EXTRACT_FLAG_STRICT_TIMESTAMPS, and
 *      ::WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS.  For example, if
 *      ::WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES is specified in @p
 *      extract_flags, ::WIMLIB_ERR_UNSUPPORTED will be returned if the WIM
 *      image contains one or more files with short names, but extracting short
 *      names is not supported --- on Windows, this occurs if the target volume
 *      does not support short names, while on non-Windows, this occurs if
 *      ::WIMLIB_EXTRACT_FLAG_NTFS was not specified in @p extract_flags.
 * @retval ::WIMLIB_ERR_WIMBOOT
 *      ::WIMLIB_EXTRACT_FLAG_WIMBOOT was specified in @p extract_flags, but
 *      there was a problem creating WIMBoot pointer files or registering a
 *      source WIM file with the Windows Overlay Filesystem (WOF) driver.
 * @retval ::WIMLIB_ERR_WRITE
 *      Failed to write data to a file being extracted.
 *
 * If a progress function is registered with @p wim, then as each image is
 * extracted it will receive ::WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN, then
 * zero or more ::WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE messages, then zero
 * or more ::WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS messages, then zero or more
 * ::WIMLIB_PROGRESS_MSG_EXTRACT_METADATA messages, then
 * ::WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END.
 */
extern int
wimlib_extract_image(WIMStruct *wim, int image,
                     const wimlib_tchar *target, int extract_flags);

/**
 * @ingroup G_extracting_wims
 *
 * Extract one image from a pipe on which a pipable WIM is being sent.
 *
 * See the documentation for ::WIMLIB_WRITE_FLAG_PIPABLE, and @ref
 * subsec_pipable_wims, for more information about pipable WIMs.
 *
 * This function operates in a special way to read the WIM fully sequentially.
 * As a result, there is no ::WIMStruct is made visible to library users, and
 * you cannot call wimlib_open_wim() on the pipe.  (You can, however, use
 * wimlib_open_wim() to transparently open a pipable WIM if it's available as a
 * seekable file, not a pipe.)
 *
 * @param pipe_fd
 *      File descriptor, which may be a pipe, opened for reading and positioned
 *      at the start of the pipable WIM.
 * @param image_num_or_name
 *      String that specifies the 1-based index or name of the image to extract.
 *      It is translated to an image index using the same rules that
 *      wimlib_resolve_image() uses.  However, unlike wimlib_extract_image(),
 *      only a single image (not all images) can be specified.  Alternatively,
 *      specify @p NULL here to use the first image in the WIM if it contains
 *      exactly one image but otherwise return ::WIMLIB_ERR_INVALID_IMAGE.
 * @param target
 *      Same as the corresponding parameter to wimlib_extract_image().
 * @param extract_flags
 *      Same as the corresponding parameter to wimlib_extract_image().
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.  The possible
 * error codes include those returned by wimlib_extract_image() and
 * wimlib_open_wim() as well as the following:
 *
 * @retval ::WIMLIB_ERR_INVALID_PIPABLE_WIM
 *      Data read from the pipable WIM was invalid.
 * @retval ::WIMLIB_ERR_NOT_PIPABLE
 *      The WIM being piped over @p pipe_fd is a normal WIM, not a pipable WIM.
 */
extern int
wimlib_extract_image_from_pipe(int pipe_fd,
                               const wimlib_tchar *image_num_or_name,
                               const wimlib_tchar *target, int extract_flags);

/**
 * @ingroup G_extracting_wims
 *
 * Same as wimlib_extract_image_from_pipe(), but allows specifying a progress
 * function.  The progress function will be used while extracting the image and
 * will receive the normal extraction progress messages, such as
 * ::WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS, in addition to
 * ::WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN.
 */
extern int
wimlib_extract_image_from_pipe_with_progress(int pipe_fd,
                                             const wimlib_tchar *image_num_or_name,
                                             const wimlib_tchar *target,
                                             int extract_flags,
                                             wimlib_progress_func_t progfunc,
                                             void *progctx);

/**
 * @ingroup G_extracting_wims
 *
 * Similar to wimlib_extract_paths(), but the paths to extract from the WIM
 * image are specified in the ASCII, UTF-8, or UTF-16LE text file named by @p
 * path_list_file which itself contains the list of paths to use, one per line.
 * Leading and trailing whitespace is ignored.  Empty lines and lines beginning
 * with the ';' or '#' characters are ignored.  No quotes are needed, as paths
 * are otherwise delimited by the newline character.  However, quotes will be
 * stripped if present.
 *
 * The error codes are the same as those returned by wimlib_extract_paths(),
 * except that wimlib_extract_pathlist() returns an appropriate error code if it
 * cannot read the path list file (e.g. ::WIMLIB_ERR_OPEN, ::WIMLIB_ERR_STAT,
 * ::WIMLIB_ERR_READ).
 */
extern int
wimlib_extract_pathlist(WIMStruct *wim, int image,
                        const wimlib_tchar *target,
                        const wimlib_tchar *path_list_file,
                        int extract_flags);

/**
 * @ingroup G_extracting_wims
 *
 * Extract zero or more paths (files or directory trees) from the specified WIM
 * image.
 *
 * By default, each path will be extracted to a corresponding subdirectory of
 * the target based on its location in the image.  For example, if one of the
 * paths to extract is <c>/Windows/explorer.exe</c> and the target is
 * <c>outdir</c>, the file will be extracted to
 * <c>outdir/Windows/explorer.exe</c>.  This behavior can be changed by
 * providing the flag ::WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE, which
 * will cause each file or directory tree to be placed directly in the target
 * directory --- so the same example would extract <c>/Windows/explorer.exe</c>
 * to <c>outdir/explorer.exe</c>.
 *
 * With globbing turned off (the default), paths are always checked for
 * existence strictly; that is, if any path to extract does not exist in the
 * image, then nothing is extracted and the function fails with
 * ::WIMLIB_ERR_PATH_DOES_NOT_EXIST.  But with globbing turned on
 * (::WIMLIB_EXTRACT_FLAG_GLOB_PATHS specified), globs are by default permitted
 * to match no files, and there is a flag (::WIMLIB_EXTRACT_FLAG_STRICT_GLOB) to
 * enable the strict behavior if desired.
 *
 * Symbolic links are not dereferenced when paths in the image are interpreted.
 *
 * @param wim
 *      WIM from which to extract the paths, specified as a pointer to the
 *      ::WIMStruct for a standalone WIM file, a delta WIM file, or part 1 of a
 *      split WIM.  In the case of a WIM file that is not standalone, this
 *      ::WIMStruct must have had any needed external resources previously
 *      referenced using wimlib_reference_resources() or
 *      wimlib_reference_resource_files().
 * @param image
 *      The 1-based index of the WIM image from which to extract the paths.
 * @param paths
 *      Array of paths to extract.  Each element must be the absolute path to a
 *      file or directory within the image.  Path separators may be either
 *      forwards or backwards slashes, and leading path separators are optional.
 *      The paths will be interpreted either case-sensitively (UNIX default) or
 *      case-insensitively (Windows default); however, the case sensitivity can
 *      be configured explicitly at library initialization time by passing an
 *      appropriate flag to wimlib_global_init().
 *      <br/>
 *      By default, "globbing" is disabled, so the characters @c * and @c ? are
 *      interpreted literally.  This can be changed by specifying
 *      ::WIMLIB_EXTRACT_FLAG_GLOB_PATHS in @p extract_flags.
 * @param num_paths
 *      Number of paths specified in @p paths.
 * @param target
 *      Directory to which to extract the paths.
 * @param extract_flags
 *      Bitwise OR of flags prefixed with WIMLIB_EXTRACT_FLAG.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.  Most of the
 * error codes are the same as those returned by wimlib_extract_image().  Below,
 * some of the error codes returned in situations specific to path-mode
 * extraction are documented:
 *
 * @retval ::WIMLIB_ERR_NOT_A_REGULAR_FILE
 *      ::WIMLIB_EXTRACT_FLAG_TO_STDOUT was specified in @p extract_flags, but
 *      one of the paths to extract did not name a regular file.
 * @retval ::WIMLIB_ERR_PATH_DOES_NOT_EXIST
 *      One of the paths to extract does not exist in the image; see discussion
 *      above about strict vs. non-strict behavior.
 *
 * If a progress function is registered with @p wim, then it will receive
 * ::WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS.
 */
extern int
wimlib_extract_paths(WIMStruct *wim,
                     int image,
                     const wimlib_tchar *target,
                     const wimlib_tchar * const *paths,
                     size_t num_paths,
                     int extract_flags);

/**
 * @ingroup G_wim_information
 *
 * Similar to wimlib_get_xml_data(), but the XML document will be written to the
 * specified standard C <c>FILE*</c> instead of retrieved in an in-memory
 * buffer.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.  This may
 * return any error code which can be returned by wimlib_get_xml_data() as well
 * as the following error codes:
 *
 * @retval ::WIMLIB_ERR_WRITE
 *      Failed to write the data to the requested file.
 */
extern int
wimlib_extract_xml_data(WIMStruct *wim, FILE *fp);

/**
 * @ingroup G_general
 *
 * Release a reference to a ::WIMStruct.  If the ::WIMStruct is still referenced
 * by other ::WIMStruct's (e.g. following calls to wimlib_export_image() or
 * wimlib_reference_resources()), then the library will free it later, when the
 * last reference is released; otherwise it is freed immediately and any
 * associated file descriptors are closed.
 *
 * @param wim
 *      Pointer to the ::WIMStruct to release.  If @c NULL, no action is taken.
 */
extern void
wimlib_free(WIMStruct *wim);

/**
 * @ingroup G_general
 *
 * Convert a ::wimlib_compression_type value into a string.
 *
 * @param ctype
 *      The compression type value to convert.
 *
 * @return
 *      A statically allocated string naming the compression type, such as
 *      "None", "LZX", or "XPRESS".  If the value was unrecognized, then
 *      the resulting string will be "Invalid".
 */
extern const wimlib_tchar *
wimlib_get_compression_type_string(enum wimlib_compression_type ctype);

/**
 * @ingroup G_general
 *
 * Convert a wimlib error code into a string describing it.
 *
 * @param code
 *      An error code returned by one of wimlib's functions.
 *
 * @return
 *      Pointer to a statically allocated string describing the error code.  If
 *      the value was unrecognized, then the resulting string will be "Unknown
 *      error".
 */
extern const wimlib_tchar *
wimlib_get_error_string(enum wimlib_error_code code);

/**
 * @ingroup G_wim_information
 *
 * Get the description of the specified image.  Equivalent to
 * <tt>wimlib_get_image_property(wim, image, "DESCRIPTION")</tt>.
 */
extern const wimlib_tchar *
wimlib_get_image_description(const WIMStruct *wim, int image);

/**
 * @ingroup G_wim_information
 *
 * Get the name of the specified image.  Equivalent to
 * <tt>wimlib_get_image_property(wim, image, "NAME")</tt>, except that
 * wimlib_get_image_name() will return an empty string if the image is unnamed
 * whereas wimlib_get_image_property() may return @c NULL in that case.
 */
extern const wimlib_tchar *
wimlib_get_image_name(const WIMStruct *wim, int image);

/**
 * @ingroup G_wim_information
 *
 * Since wimlib v1.8.3: get a per-image property from the WIM's XML document.
 * This is an alternative to wimlib_get_image_name() and
 * wimlib_get_image_description() which allows getting any simple string
 * property.
 *
 * @param wim
 *      Pointer to the ::WIMStruct for the WIM.
 * @param image
 *      The 1-based index of the image for which to get the property.
 * @param property_name
 *      The name of the image property, for example "NAME", "DESCRIPTION", or
 *      "TOTALBYTES".  The name can contain forward slashes to indicate a nested
 *      XML element; for example, "WINDOWS/VERSION/BUILD" indicates the BUILD
 *      element nested within the VERSION element nested within the WINDOWS
 *      element.  Since wimlib v1.9.0, a bracketed number can be used to
 *      indicate one of several identically-named elements; for example,
 *      "WINDOWS/LANGUAGES/LANGUAGE[2]" indicates the second "LANGUAGE" element
 *      nested within the "WINDOWS/LANGUAGES" element.  Note that element names
 *      are case sensitive.
 *
 * @return
 *      The property's value as a ::wimlib_tchar string, or @c NULL if there is
 *      no such property.  The string may not remain valid after later library
 *      calls, so the caller should duplicate it if needed.
 */
extern const wimlib_tchar *
wimlib_get_image_property(const WIMStruct *wim, int image,
                          const wimlib_tchar *property_name);

/**
 * @ingroup G_general
 *
 * Return the version of wimlib as a 32-bit number whose top 12 bits contain the
 * major version, the next 10 bits contain the minor version, and the low 10
 * bits contain the patch version.
 *
 * In other words, the returned value is equal to <c>((WIMLIB_MAJOR_VERSION <<
 * 20) | (WIMLIB_MINOR_VERSION << 10) | WIMLIB_PATCH_VERSION)</c> for the
 * corresponding header file.
 */
extern uint32_t
wimlib_get_version(void);

/**
 * @ingroup G_wim_information
 *
 * Get basic information about a WIM file.
 *
 * @param wim
 *      Pointer to the ::WIMStruct to query.  This need not represent a
 *      standalone WIM (e.g. it could represent part of a split WIM).
 * @param info
 *      A ::wimlib_wim_info structure that will be filled in with information
 *      about the WIM file.
 *
 * @return 0
 */
extern int
wimlib_get_wim_info(WIMStruct *wim, struct wimlib_wim_info *info);

/**
 * @ingroup G_wim_information
 *
 * Read a WIM file's XML document into an in-memory buffer.
 *
 * The XML document contains metadata about the WIM file and the images stored
 * in it.
 *
 * @param wim
 *      Pointer to the ::WIMStruct to query.  This need not represent a
 *      standalone WIM (e.g. it could represent part of a split WIM).
 * @param buf_ret
 *      On success, a pointer to an allocated buffer containing the raw UTF16-LE
 *      XML document is written to this location.
 * @param bufsize_ret
 *      The size of the XML document in bytes is written to this location.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_NO_FILENAME
 *      @p wim is not backed by a file and therefore does not have an XML
 *      document.
 * @retval ::WIMLIB_ERR_READ
 *      Failed to read the XML document from the WIM file.
 * @retval ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE
 *      Failed to read the XML document from the WIM file.
 */
extern int
wimlib_get_xml_data(WIMStruct *wim, void **buf_ret, size_t *bufsize_ret);

/**
 * @ingroup G_general
 *
 * Initialization function for wimlib.  Call before using any other wimlib
 * function (except possibly wimlib_set_print_errors()).  If not done manually,
 * this function will be called automatically with a flags argument of 0.  This
 * function does nothing if called again after it has already successfully run.
 *
 * @param init_flags
 *      Bitwise OR of flags prefixed with WIMLIB_INIT_FLAG.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INSUFFICIENT_PRIVILEGES
 *      ::WIMLIB_INIT_FLAG_STRICT_APPLY_PRIVILEGES and/or
 *      ::WIMLIB_INIT_FLAG_STRICT_CAPTURE_PRIVILEGES were specified in @p
 *      init_flags, but the corresponding privileges could not be acquired.
 */
extern int
wimlib_global_init(int init_flags);

/**
 * @ingroup G_general
 *
 * Cleanup function for wimlib.  You are not required to call this function, but
 * it will release any global resources allocated by the library.
 */
extern void
wimlib_global_cleanup(void);

/**
 * @ingroup G_wim_information
 *
 * Determine if an image name is already used by some image in the WIM.
 *
 * @param wim
 *      Pointer to the ::WIMStruct to query.  This need not represent a
 *      standalone WIM (e.g. it could represent part of a split WIM).
 * @param name
 *      The name to check.
 *
 * @return
 *      @c true if there is already an image in @p wim named @p name; @c false
 *      if there is no image named @p name in @p wim.  If @p name is @c NULL or
 *      the empty string, then @c false is returned.
 */
extern bool
wimlib_image_name_in_use(const WIMStruct *wim, const wimlib_tchar *name);

/**
 * @ingroup G_wim_information
 *
 * Iterate through a file or directory tree in a WIM image.  By specifying
 * appropriate flags and a callback function, you can get the attributes of a
 * file in the image, get a directory listing, or even get a listing of the
 * entire image.
 *
 * @param wim
 *      The ::WIMStruct containing the image(s) over which to iterate.  This
 *      ::WIMStruct must contain image metadata, so it cannot be the non-first
 *      part of a split WIM (for example).
 * @param image
 *      The 1-based index of the image that contains the files or directories to
 *      iterate over, or ::WIMLIB_ALL_IMAGES to iterate over all images.
 * @param path
 *      Path in the image at which to do the iteration.
 * @param flags
 *      Bitwise OR of flags prefixed with WIMLIB_ITERATE_DIR_TREE_FLAG.
 * @param cb
 *      A callback function that will receive each directory entry.
 * @param user_ctx
 *      An extra parameter that will always be passed to the callback function
 *      @p cb.
 *
 * @return Normally, returns 0 if all calls to @p cb returned 0; otherwise the
 * first nonzero value that was returned from @p cb.  However, additional
 * ::wimlib_error_code values may be returned, including the following:
 *
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p image does not exist in @p wim.
 * @retval ::WIMLIB_ERR_PATH_DOES_NOT_EXIST
 *      @p path does not exist in the image.
 * @retval ::WIMLIB_ERR_RESOURCE_NOT_FOUND
 *      ::WIMLIB_ITERATE_DIR_TREE_FLAG_RESOURCES_NEEDED was specified, but the
 *      data for some files could not be found in the blob lookup table of @p
 *      wim.
 *
 * This function can additionally return ::WIMLIB_ERR_DECOMPRESSION,
 * ::WIMLIB_ERR_INVALID_METADATA_RESOURCE, ::WIMLIB_ERR_METADATA_NOT_FOUND,
 * ::WIMLIB_ERR_READ, or ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE, all of which
 * indicate failure (for different reasons) to read the metadata resource for an
 * image over which iteration needed to be done.
 */
extern int
wimlib_iterate_dir_tree(WIMStruct *wim, int image, const wimlib_tchar *path,
                        int flags,
                        wimlib_iterate_dir_tree_callback_t cb, void *user_ctx);

/**
 * @ingroup G_wim_information
 *
 * Iterate through the blob lookup table of a ::WIMStruct.  This can be used to
 * directly get a listing of the unique "blobs" contained in a WIM file, which
 * are deduplicated over all images.
 *
 * Specifically, each listed blob may be from any of the following sources:
 *
 * - Metadata blobs, if the ::WIMStruct contains image metadata
 * - File blobs from the on-disk WIM file (if any) backing the ::WIMStruct
 * - File blobs from files that have been added to the in-memory ::WIMStruct,
 *   e.g. by using wimlib_add_image()
 * - File blobs from external WIMs referenced by
 *   wimlib_reference_resource_files() or wimlib_reference_resources()
 *
 * @param wim
 *      Pointer to the ::WIMStruct for which to get the blob listing.
 * @param flags
 *      Reserved; set to 0.
 * @param cb
 *      A callback function that will receive each blob.
 * @param user_ctx
 *      An extra parameter that will always be passed to the callback function
 *      @p cb.
 *
 * @return 0 if all calls to @p cb returned 0; otherwise the first nonzero value
 * that was returned from @p cb.
 */
extern int
wimlib_iterate_lookup_table(WIMStruct *wim, int flags,
                            wimlib_iterate_lookup_table_callback_t cb,
                            void *user_ctx);

/**
 * @ingroup G_nonstandalone_wims
 *
 * Join a split WIM into a stand-alone (one-part) WIM.
 *
 * @param swms
 *      An array of strings that gives the filenames of all parts of the split
 *      WIM.  No specific order is required, but all parts must be included with
 *      no duplicates.
 * @param num_swms
 *      Number of filenames in @p swms.
 * @param swm_open_flags
 *      Open flags for the split WIM parts (e.g.
 *      ::WIMLIB_OPEN_FLAG_CHECK_INTEGRITY).
 * @param wim_write_flags
 *      Bitwise OR of relevant flags prefixed with WIMLIB_WRITE_FLAG, which will
 *      be used to write the joined WIM.
 * @param output_path
 *      The path to write the joined WIM file to.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.  This function
 * may return most error codes that can be returned by wimlib_open_wim() and
 * wimlib_write(), as well as the following error codes:
 *
 * @retval ::WIMLIB_ERR_SPLIT_INVALID
 *      The split WIMs do not form a valid WIM because they do not include all
 *      the parts of the original WIM, there are duplicate parts, or not all the
 *      parts have the same GUID and compression type.
 *
 * Note: wimlib is generalized enough that this function is not actually needed
 * to join a split WIM; instead, you could open the first part of the split WIM,
 * then reference the other parts with wimlib_reference_resource_files(), then
 * write the joined WIM using wimlib_write().  However, wimlib_join() provides
 * an easy-to-use wrapper around this that has some advantages (e.g.  extra
 * sanity checks).
 */
extern int
wimlib_join(const wimlib_tchar * const *swms,
            unsigned num_swms,
            const wimlib_tchar *output_path,
            int swm_open_flags,
            int wim_write_flags);

/**
 * @ingroup G_nonstandalone_wims
 *
 * Same as wimlib_join(), but allows specifying a progress function.  The
 * progress function will receive the write progress messages, such as
 * ::WIMLIB_PROGRESS_MSG_WRITE_STREAMS, while writing the joined WIM.  In
 * addition, if ::WIMLIB_OPEN_FLAG_CHECK_INTEGRITY is specified in @p
 * swm_open_flags, the progress function will receive a series of
 * ::WIMLIB_PROGRESS_MSG_VERIFY_INTEGRITY messages when each of the split WIM
 * parts is opened.
 */
extern int
wimlib_join_with_progress(const wimlib_tchar * const *swms,
                          unsigned num_swms,
                          const wimlib_tchar *output_path,
                          int swm_open_flags,
                          int wim_write_flags,
                          wimlib_progress_func_t progfunc,
                          void *progctx);


/**
 * @ingroup G_mounting_wim_images
 *
 * Mount an image from a WIM file on a directory read-only or read-write.
 *
 * @param wim
 *      Pointer to the ::WIMStruct containing the image to be mounted.  This
 *      ::WIMStruct must have a backing file.
 * @param image
 *      The 1-based index of the image to mount.  This image cannot have been
 *      previously modified in memory.
 * @param dir
 *      The path to an existing empty directory on which to mount the image.
 * @param mount_flags
 *      Bitwise OR of flags prefixed with WIMLIB_MOUNT_FLAG.  Use
 *      ::WIMLIB_MOUNT_FLAG_READWRITE to request a read-write mount instead of a
 *      read-only mount.
 * @param staging_dir
 *      If non-NULL, the name of a directory in which a temporary directory for
 *      storing modified or added files will be created.  Ignored if
 *      ::WIMLIB_MOUNT_FLAG_READWRITE is not specified in @p mount_flags.  If
 *      left @c NULL, the staging directory is created in the same directory as
 *      the backing WIM file.  The staging directory is automatically deleted
 *      when the image is unmounted.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_ALREADY_LOCKED
 *      Another process is currently modifying the WIM file.
 * @retval ::WIMLIB_ERR_FUSE
 *      A non-zero status code was returned by @c fuse_main().
 * @retval ::WIMLIB_ERR_IMAGE_HAS_MULTIPLE_REFERENCES
 *      There are currently multiple references to the image as a result of a
 *      call to wimlib_export_image().  Free one before attempting the
 *      read-write mount.
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p image does not exist in @p wim.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      @p wim was @c NULL; or @p dir was NULL or an empty string; or an
 *      unrecognized flag was specified in @p mount_flags; or the image has
 *      already been modified in memory (e.g. by wimlib_update_image()).
 * @retval ::WIMLIB_ERR_MKDIR
 *      ::WIMLIB_MOUNT_FLAG_READWRITE was specified in @p mount_flags, but the
 *      staging directory could not be created.
 * @retval ::WIMLIB_ERR_WIM_IS_READONLY
 *      ::WIMLIB_MOUNT_FLAG_READWRITE was specified in @p mount_flags, but the
 *      WIM file is considered read-only because of any of the reasons mentioned
 *      in the documentation for the ::WIMLIB_OPEN_FLAG_WRITE_ACCESS flag.
 * @retval ::WIMLIB_ERR_UNSUPPORTED
 *      Mounting is not supported in this build of the library.
 *
 * This function can additionally return ::WIMLIB_ERR_DECOMPRESSION,
 * ::WIMLIB_ERR_INVALID_METADATA_RESOURCE, ::WIMLIB_ERR_METADATA_NOT_FOUND,
 * ::WIMLIB_ERR_READ, or ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE, all of which
 * indicate failure (for different reasons) to read the metadata resource for
 * the image to mount.
 *
 * The ability to mount WIM images is implemented using FUSE (Filesystem in
 * UserSpacE).  Depending on how FUSE is set up on your system, this function
 * may work as normal users in addition to the root user.
 *
 * Mounting WIM images is not supported if wimlib was configured
 * <c>--without-fuse</c>.  This includes Windows builds of wimlib;
 * ::WIMLIB_ERR_UNSUPPORTED will be returned in such cases.
 *
 * Calling this function daemonizes the process, unless
 * ::WIMLIB_MOUNT_FLAG_DEBUG was specified or an early error occurs.
 *
 * It is safe to mount multiple images from the same WIM file read-only at the
 * same time, but only if different ::WIMStruct's are used.  It is @b not safe
 * to mount multiple images from the same WIM file read-write at the same time.
 *
 * To unmount the image, call wimlib_unmount_image().  This may be done in a
 * different process.
 */
extern int
wimlib_mount_image(WIMStruct *wim,
                   int image,
                   const wimlib_tchar *dir,
                   int mount_flags,
                   const wimlib_tchar *staging_dir);

/**
 * @ingroup G_creating_and_opening_wims
 *
 * Open a WIM file and create a ::WIMStruct for it.
 *
 * @param wim_file
 *      The path to the WIM file to open.
 * @param open_flags
 *      Bitwise OR of flags prefixed with WIMLIB_OPEN_FLAG.
 * @param wim_ret
 *      On success, a pointer to a new ::WIMStruct backed by the specified
 *      on-disk WIM file is written to the memory location pointed to by this
 *      parameter.  This ::WIMStruct must be freed using using wimlib_free()
 *      when finished with it.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_IMAGE_COUNT
 *      The number of metadata resources found in the WIM did not match the
 *      image count specified in the WIM header, or the number of &lt;IMAGE&gt;
 *      elements in the XML data of the WIM did not match the image count
 *      specified in the WIM header.
 * @retval ::WIMLIB_ERR_INTEGRITY
 *      ::WIMLIB_OPEN_FLAG_CHECK_INTEGRITY was specified in @p open_flags, and
 *      the WIM file failed the integrity check.
 * @retval ::WIMLIB_ERR_INVALID_CHUNK_SIZE
 *      The library did not recognize the compression chunk size of the WIM as
 *      valid for its compression type.
 * @retval ::WIMLIB_ERR_INVALID_COMPRESSION_TYPE
 *      The library did not recognize the compression type of the WIM.
 * @retval ::WIMLIB_ERR_INVALID_HEADER
 *      The header of the WIM was otherwise invalid.
 * @retval ::WIMLIB_ERR_INVALID_INTEGRITY_TABLE
 *      ::WIMLIB_OPEN_FLAG_CHECK_INTEGRITY was specified in @p open_flags and
 *      the WIM contained an integrity table, but the integrity table was
 *      invalid.
 * @retval ::WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY
 *      The lookup table of the WIM was invalid.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      @p wim_ret was @c NULL; or, @p wim_file was not a nonempty string.
 * @retval ::WIMLIB_ERR_IS_SPLIT_WIM
 *      The WIM was a split WIM and ::WIMLIB_OPEN_FLAG_ERROR_IF_SPLIT was
 *      specified in @p open_flags.
 * @retval ::WIMLIB_ERR_NOT_A_WIM_FILE
 *      The file did not begin with the magic characters that identify a WIM
 *      file.
 * @retval ::WIMLIB_ERR_OPEN
 *      Failed to open the WIM file for reading.  Some possible reasons: the WIM
 *      file does not exist, or the calling process does not have permission to
 *      open it.
 * @retval ::WIMLIB_ERR_READ
 *      Failed to read data from the WIM file.
 * @retval ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE
 *      Unexpected end-of-file while reading data from the WIM file.
 * @retval ::WIMLIB_ERR_UNKNOWN_VERSION
 *      The WIM version number was not recognized. (May be a pre-Vista WIM.)
 * @retval ::WIMLIB_ERR_WIM_IS_ENCRYPTED
 *      The WIM cannot be opened because it contains encrypted segments.  (It
 *      may be a Windows 8 "ESD" file.)
 * @retval ::WIMLIB_ERR_WIM_IS_INCOMPLETE
 *      The WIM file is not complete (e.g. the program which wrote it was
 *      terminated before it finished)
 * @retval ::WIMLIB_ERR_WIM_IS_READONLY
 *      ::WIMLIB_OPEN_FLAG_WRITE_ACCESS was specified but the WIM file was
 *      considered read-only because of any of the reasons mentioned in the
 *      documentation for the ::WIMLIB_OPEN_FLAG_WRITE_ACCESS flag.
 * @retval ::WIMLIB_ERR_XML
 *      The XML data of the WIM was invalid.
 */
extern int
wimlib_open_wim(const wimlib_tchar *wim_file,
                int open_flags,
                WIMStruct **wim_ret);

/**
 * @ingroup G_creating_and_opening_wims
 *
 * Same as wimlib_open_wim(), but allows specifying a progress function and
 * progress context.  If successful, the progress function will be registered in
 * the newly open ::WIMStruct, as if by an automatic call to
 * wimlib_register_progress_function().  In addition, if
 * ::WIMLIB_OPEN_FLAG_CHECK_INTEGRITY is specified in @p open_flags, then the
 * progress function will receive ::WIMLIB_PROGRESS_MSG_VERIFY_INTEGRITY
 * messages while checking the WIM file's integrity.
 */
extern int
wimlib_open_wim_with_progress(const wimlib_tchar *wim_file,
                              int open_flags,
                              WIMStruct **wim_ret,
                              wimlib_progress_func_t progfunc,
                              void *progctx);

/**
 * @ingroup G_writing_and_overwriting_wims
 *
 * Commit a ::WIMStruct to disk, updating its backing file.
 *
 * There are several alternative ways in which changes may be committed:
 *
 *   1. Full rebuild: write the updated WIM to a temporary file, then rename the
 *      temporary file to the original.
 *   2. Appending: append updates to the new original WIM file, then overwrite
 *      its header such that those changes become visible to new readers.
 *   3. Compaction: normally should not be used; see
 *      ::WIMLIB_WRITE_FLAG_UNSAFE_COMPACT for details.
 *
 * Append mode is often much faster than a full rebuild, but it wastes some
 * amount of space due to leaving "holes" in the WIM file.  Because of the
 * greater efficiency, wimlib_overwrite() normally defaults to append mode.
 * However, ::WIMLIB_WRITE_FLAG_REBUILD can be used to explicitly request a full
 * rebuild.  In addition, if wimlib_delete_image() has been used on the
 * ::WIMStruct, then the default mode switches to rebuild mode, and
 * ::WIMLIB_WRITE_FLAG_SOFT_DELETE can be used to explicitly request append
 * mode.
 *
 * If this function completes successfully, then no more functions can be called
 * on the ::WIMStruct other than wimlib_free().  If you need to continue using
 * the WIM file, you must use wimlib_open_wim() to open a new ::WIMStruct for
 * it.
 *
 * @param wim
 *      Pointer to a ::WIMStruct to commit to its backing file.
 * @param write_flags
 *      Bitwise OR of relevant flags prefixed with WIMLIB_WRITE_FLAG.
 * @param num_threads
 *      The number of threads to use for compressing data, or 0 to have the
 *      library automatically choose an appropriate number.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.  This function
 * may return most error codes returned by wimlib_write() as well as the
 * following error codes:
 *
 * @retval ::WIMLIB_ERR_ALREADY_LOCKED
 *      Another process is currently modifying the WIM file.
 * @retval ::WIMLIB_ERR_NO_FILENAME
 *      @p wim is not backed by an on-disk file.  In other words, it is a
 *      ::WIMStruct created by wimlib_create_new_wim() rather than
 *      wimlib_open_wim().
 * @retval ::WIMLIB_ERR_RENAME
 *      The temporary file to which the WIM was written could not be renamed to
 *      the original file.
 * @retval ::WIMLIB_ERR_WIM_IS_READONLY
 *      The WIM file is considered read-only because of any of the reasons
 *      mentioned in the documentation for the ::WIMLIB_OPEN_FLAG_WRITE_ACCESS
 *      flag.
 *
 * If a progress function is registered with @p wim, then it will receive the
 * messages ::WIMLIB_PROGRESS_MSG_WRITE_STREAMS,
 * ::WIMLIB_PROGRESS_MSG_WRITE_METADATA_BEGIN, and
 * ::WIMLIB_PROGRESS_MSG_WRITE_METADATA_END.
 */
extern int
wimlib_overwrite(WIMStruct *wim, int write_flags, unsigned num_threads);

/**
 * @ingroup G_wim_information
 *
 * (Deprecated) Print information about one image, or all images, contained in a
 * WIM.
 *
 * @param wim
 *      Pointer to the ::WIMStruct to query.  This need not represent a
 *      standalone WIM (e.g. it could represent part of a split WIM).
 * @param image
 *      The 1-based index of the image for which to print information, or
 *      ::WIMLIB_ALL_IMAGES to print information about all images.
 *
 * @return This function has no return value.  No error checking is done when
 * printing the information.  If @p image is invalid, an error message is
 * printed.
 *
 * This function is deprecated; use wimlib_get_xml_data() or
 * wimlib_get_image_property() to query image information instead.
 */
extern void
wimlib_print_available_images(const WIMStruct *wim, int image);

/**
 * @ingroup G_wim_information
 *
 * Print the header of the WIM file (intended for debugging only).
 */
extern void
wimlib_print_header(const WIMStruct *wim);

/**
 * @ingroup G_nonstandalone_wims
 *
 * Reference file data from other WIM files or split WIM parts.  This function
 * can be used on WIMs that are not standalone, such as split or "delta" WIMs,
 * to load additional file data before calling a function such as
 * wimlib_extract_image() that requires the file data to be present.
 *
 * @param wim
 *      The ::WIMStruct for a WIM that contains metadata resources, but is not
 *      necessarily "standalone".  In the case of split WIMs, this should be the
 *      first part, since only the first part contains the metadata resources.
 *      In the case of delta WIMs, this should be the delta WIM rather than the
 *      WIM on which it is based.
 * @param resource_wimfiles_or_globs
 *      Array of paths to WIM files and/or split WIM parts to reference.
 *      Alternatively, when ::WIMLIB_REF_FLAG_GLOB_ENABLE is specified in @p
 *      ref_flags, these are treated as globs rather than literal paths.  That
 *      is, using this function you can specify zero or more globs, each of
 *      which expands to one or more literal paths.
 * @param count
 *      Number of entries in @p resource_wimfiles_or_globs.
 * @param ref_flags
 *      Bitwise OR of ::WIMLIB_REF_FLAG_GLOB_ENABLE and/or
 *      ::WIMLIB_REF_FLAG_GLOB_ERR_ON_NOMATCH.
 * @param open_flags
 *      Additional open flags, such as ::WIMLIB_OPEN_FLAG_CHECK_INTEGRITY, to
 *      pass to internal calls to wimlib_open_wim() on the reference files.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_GLOB_HAD_NO_MATCHES
 *      One of the specified globs did not match any paths (only with both
 *      ::WIMLIB_REF_FLAG_GLOB_ENABLE and ::WIMLIB_REF_FLAG_GLOB_ERR_ON_NOMATCH
 *      specified in @p ref_flags).
 * @retval ::WIMLIB_ERR_READ
 *      I/O or permissions error while processing a file glob.
 *
 * This function can additionally return most values that can be returned by
 * wimlib_open_wim().
 */
extern int
wimlib_reference_resource_files(WIMStruct *wim,
                                const wimlib_tchar * const *resource_wimfiles_or_globs,
                                unsigned count,
                                int ref_flags,
                                int open_flags);

/**
 * @ingroup G_nonstandalone_wims
 *
 * Similar to wimlib_reference_resource_files(), but operates at a lower level
 * where the caller must open the ::WIMStruct for each referenced file itself.
 *
 * @param wim
 *      The ::WIMStruct for a WIM that contains metadata resources, but is not
 *      necessarily "standalone".  In the case of split WIMs, this should be the
 *      first part, since only the first part contains the metadata resources.
 * @param resource_wims
 *      Array of pointers to the ::WIMStruct's for additional resource WIMs or
 *      split WIM parts to reference.
 * @param num_resource_wims
 *      Number of entries in @p resource_wims.
 * @param ref_flags
 *      Reserved; must be 0.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 */
extern int
wimlib_reference_resources(WIMStruct *wim, WIMStruct **resource_wims,
                           unsigned num_resource_wims, int ref_flags);

/**
 * @ingroup G_modifying_wims
 *
 * Declare that a newly added image is mostly the same as a prior image, but
 * captured at a later point in time, possibly with some modifications in the
 * intervening time.  This is designed to be used in incremental backups of the
 * same filesystem or directory tree.
 *
 * This function compares the metadata of the directory tree of the newly added
 * image against that of the old image.  Any files that are present in both the
 * newly added image and the old image and have timestamps that indicate they
 * haven't been modified are deemed not to have been modified and have their
 * checksums copied from the old image.  Because of this and because WIM uses
 * single-instance streams, such files need not be read from the filesystem when
 * the WIM is being written or overwritten.  Note that these unchanged files
 * will still be "archived" and will be logically present in the new image; the
 * optimization is that they don't need to actually be read from the filesystem
 * because the WIM already contains them.
 *
 * This function is provided to optimize incremental backups.  The resulting WIM
 * file will still be the same regardless of whether this function is called.
 * (This is, however, assuming that timestamps have not been manipulated or
 * unmaintained as to trick this function into thinking a file has not been
 * modified when really it has.  To partly guard against such cases, other
 * metadata such as file sizes will be checked as well.)
 *
 * This function must be called after adding the new image (e.g. with
 * wimlib_add_image()), but before writing the updated WIM file (e.g. with
 * wimlib_overwrite()).
 *
 * @param wim
 *      Pointer to the ::WIMStruct containing the newly added image.
 * @param new_image
 *      The 1-based index in @p wim of the newly added image.
 * @param template_wim
 *      Pointer to the ::WIMStruct containing the template image.  This can be,
 *      but does not have to be, the same ::WIMStruct as @p wim.
 * @param template_image
 *      The 1-based index in @p template_wim of the template image.
 * @param flags
 *      Reserved; must be 0.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p new_image does not exist in @p wim or @p template_image does not
 *      exist in @p template_wim.
 * @retval ::WIMLIB_ERR_METADATA_NOT_FOUND
 *      At least one of @p wim and @p template_wim does not contain image
 *      metadata; for example, one of them represents a non-first part of a
 *      split WIM.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      Identical values were provided for the template and new image; or @p
 *      new_image specified an image that had not been modified since opening
 *      the WIM.
 *
 * This function can additionally return ::WIMLIB_ERR_DECOMPRESSION,
 * ::WIMLIB_ERR_INVALID_METADATA_RESOURCE, ::WIMLIB_ERR_METADATA_NOT_FOUND,
 * ::WIMLIB_ERR_READ, or ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE, all of which
 * indicate failure (for different reasons) to read the metadata resource for
 * the template image.
 */
extern int
wimlib_reference_template_image(WIMStruct *wim, int new_image,
                                WIMStruct *template_wim, int template_image,
                                int flags);

/**
 * @ingroup G_general
 *
 * Register a progress function with a ::WIMStruct.
 *
 * @param wim
 *      The ::WIMStruct for which to register the progress function.
 * @param progfunc
 *      Pointer to the progress function to register.  If the WIM already has a
 *      progress function registered, it will be replaced with this one.  If @p
 *      NULL, the current progress function (if any) will be unregistered.
 * @param progctx
 *      The value which will be passed as the third argument to calls to @p
 *      progfunc.
 */
extern void
wimlib_register_progress_function(WIMStruct *wim,
                                  wimlib_progress_func_t progfunc,
                                  void *progctx);

/**
 * @ingroup G_modifying_wims
 *
 * Rename the @p source_path to the @p dest_path in the specified @p image of
 * the @p wim.
 *
 * This just builds an appropriate ::wimlib_rename_command and passes it to
 * wimlib_update_image().
 */
extern int
wimlib_rename_path(WIMStruct *wim, int image,
                   const wimlib_tchar *source_path, const wimlib_tchar *dest_path);

/**
 * @ingroup G_wim_information
 *
 * Translate a string specifying the name or number of an image in the WIM into
 * the number of the image.  The images are numbered starting at 1.
 *
 * @param wim
 *      Pointer to the ::WIMStruct for a WIM.
 * @param image_name_or_num
 *      A string specifying the name or number of an image in the WIM.  If it
 *      parses to a positive integer, this integer is taken to specify the
 *      number of the image, indexed starting at 1.  Otherwise, it is taken to
 *      be the name of an image, as given in the XML data for the WIM file.  It
 *      also may be the keyword "all" or the string "*", both of which will
 *      resolve to ::WIMLIB_ALL_IMAGES.
 *      <br/> <br/>
 *      There is no way to search for an image actually named "all", "*", or an
 *      integer number, or an image that has no name.  However, you can use
 *      wimlib_get_image_name() to get the name of any image.
 *
 * @return
 *      If the string resolved to a single existing image, the number of that
 *      image, indexed starting at 1, is returned.  If the keyword "all" or "*"
 *      was specified, ::WIMLIB_ALL_IMAGES is returned.  Otherwise,
 *      ::WIMLIB_NO_IMAGE is returned.  If @p image_name_or_num was @c NULL or
 *      the empty string, ::WIMLIB_NO_IMAGE is returned, even if one or more
 *      images in @p wim has no name.  (Since a WIM may have multiple unnamed
 *      images, an unnamed image must be specified by index to eliminate the
 *      ambiguity.)
 */
extern int
wimlib_resolve_image(WIMStruct *wim,
                     const wimlib_tchar *image_name_or_num);

/**
 * @ingroup G_general
 *
 * Set the file to which the library will print error and warning messages.
 *
 * This version of the function takes a C library <c>FILE*</c> opened for
 * writing (or appending).  Use wimlib_set_error_file_by_name() to specify the
 * file by name instead.
 *
 * This also enables error messages, as if by a call to
 * wimlib_set_print_errors(true).
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_UNSUPPORTED
 *      wimlib was compiled using the <c>--without-error-messages</c> option.
 */
extern int
wimlib_set_error_file(FILE *fp);

/**
 * @ingroup G_general
 *
 * Set the path to the file to which the library will print error and warning
 * messages.  The library will open this file for appending.
 *
 * This also enables error messages, as if by a call to
 * wimlib_set_print_errors(true).
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_OPEN
 *      The file named by @p path could not be opened for appending.
 * @retval ::WIMLIB_ERR_UNSUPPORTED
 *      wimlib was compiled using the <c>--without-error-messages</c> option.
 */
extern int
wimlib_set_error_file_by_name(const wimlib_tchar *path);

/**
 * @ingroup G_modifying_wims
 *
 * Change the description of a WIM image.  Equivalent to
 * <tt>wimlib_set_image_property(wim, image, "DESCRIPTION", description)</tt>.
 *
 * Note that "description" is misspelled in the name of this function.
 */
extern int
wimlib_set_image_descripton(WIMStruct *wim, int image,
                            const wimlib_tchar *description);

/**
 * @ingroup G_modifying_wims
 *
 * Change what is stored in the \<FLAGS\> element in the WIM XML document
 * (usually something like "Core" or "Ultimate").  Equivalent to
 * <tt>wimlib_set_image_property(wim, image, "FLAGS", flags)</tt>.
 */
extern int
wimlib_set_image_flags(WIMStruct *wim, int image, const wimlib_tchar *flags);

/**
 * @ingroup G_modifying_wims
 *
 * Change the name of a WIM image.  Equivalent to
 * <tt>wimlib_set_image_property(wim, image, "NAME", name)</tt>.
 */
extern int
wimlib_set_image_name(WIMStruct *wim, int image, const wimlib_tchar *name);

/**
 * @ingroup G_modifying_wims
 *
 * Since wimlib v1.8.3: add, modify, or remove a per-image property from the
 * WIM's XML document.  This is an alternative to wimlib_set_image_name(),
 * wimlib_set_image_descripton(), and wimlib_set_image_flags() which allows
 * manipulating any simple string property.
 *
 * @param wim
 *      Pointer to the ::WIMStruct for the WIM.
 * @param image
 *      The 1-based index of the image for which to set the property.
 * @param property_name
 *      The name of the image property in the same format documented for
 *      wimlib_get_image_property().
 *      <br/>
 *      Note: if creating a new element using a bracketed index such as
 *      "WINDOWS/LANGUAGES/LANGUAGE[2]", the highest index that can be specified
 *      is one greater than the number of existing elements with that same name,
 *      excluding the index.  That means that if you are adding a list of new
 *      elements, they must be added sequentially from the first index (1) to
 *      the last index (n).
 * @param property_value
 *      If not NULL and not empty, the property is set to this value.
 *      Otherwise, the property is removed from the XML document.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_IMAGE_NAME_COLLISION
 *      The user requested to set the image name (the <tt>NAME</tt> property),
 *      but another image in the WIM already had the requested name.
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p image does not exist in @p wim.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      @p property_name has an unsupported format, or @p property_name included
 *      a bracketed index that was too high.
 */
extern int
wimlib_set_image_property(WIMStruct *wim, int image,
                          const wimlib_tchar *property_name,
                          const wimlib_tchar *property_value);

/**
 * @ingroup G_general
 *
 * Set the functions that wimlib uses to allocate and free memory.
 *
 * These settings are global and not per-WIM.
 *
 * The default is to use the default @c malloc(), @c free(), and @c realloc()
 * from the standard C library.
 *
 * Note: some external functions, such as those in @c libntfs-3g, may use the
 * standard memory allocation functions regardless of this setting.
 *
 * @param malloc_func
 *      A function equivalent to @c malloc() that wimlib will use to allocate
 *      memory.  If @c NULL, the allocator function is set back to the default
 *      @c malloc() from the C library.
 * @param free_func
 *      A function equivalent to @c free() that wimlib will use to free memory.
 *      If @c NULL, the free function is set back to the default @c free() from
 *      the C library.
 * @param realloc_func
 *      A function equivalent to @c realloc() that wimlib will use to reallocate
 *      memory.  If @c NULL, the free function is set back to the default @c
 *      realloc() from the C library.
 *
 * @return 0
 */
extern int
wimlib_set_memory_allocator(void *(*malloc_func)(size_t),
                            void (*free_func)(void *),
                            void *(*realloc_func)(void *, size_t));

/**
 * @ingroup G_writing_and_overwriting_wims
 *
 * Set a ::WIMStruct's output compression chunk size.  This is the compression
 * chunk size that will be used for writing non-solid resources in subsequent
 * calls to wimlib_write() or wimlib_overwrite().  A larger compression chunk
 * size often results in a better compression ratio, but compression may be
 * slower and the speed of random access to data may be reduced.  In addition,
 * some chunk sizes are not compatible with Microsoft software.
 *
 * @param wim
 *      The ::WIMStruct for which to set the output chunk size.
 * @param chunk_size
 *      The chunk size (in bytes) to set.  The valid chunk sizes are dependent
 *      on the compression type.  See the documentation for each
 *      ::wimlib_compression_type constant for more information.  As a special
 *      case, if @p chunk_size is specified as 0, then the chunk size will be
 *      reset to the default for the currently selected output compression type.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INVALID_CHUNK_SIZE
 *      @p chunk_size was not 0 or a supported chunk size for the currently
 *      selected output compression type.
 */
extern int
wimlib_set_output_chunk_size(WIMStruct *wim, uint32_t chunk_size);

/**
 * @ingroup G_writing_and_overwriting_wims
 *
 * Similar to wimlib_set_output_chunk_size(), but set the chunk size for writing
 * solid resources.
 */
extern int
wimlib_set_output_pack_chunk_size(WIMStruct *wim, uint32_t chunk_size);

/**
 * @ingroup G_writing_and_overwriting_wims
 *
 * Set a ::WIMStruct's output compression type.  This is the compression type
 * that will be used for writing non-solid resources in subsequent calls to
 * wimlib_write() or wimlib_overwrite().
 *
 * @param wim
 *      The ::WIMStruct for which to set the output compression type.
 * @param ctype
 *      The compression type to set.  If this compression type is incompatible
 *      with the current output chunk size, then the output chunk size will be
 *      reset to the default for the new compression type.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INVALID_COMPRESSION_TYPE
 *      @p ctype did not specify a valid compression type.
 */
extern int
wimlib_set_output_compression_type(WIMStruct *wim,
                                   enum wimlib_compression_type ctype);

/**
 * @ingroup G_writing_and_overwriting_wims
 *
 * Similar to wimlib_set_output_compression_type(), but set the compression type
 * for writing solid resources.  This cannot be ::WIMLIB_COMPRESSION_TYPE_NONE.
 */
extern int
wimlib_set_output_pack_compression_type(WIMStruct *wim,
                                        enum wimlib_compression_type ctype);

/**
 * @ingroup G_general
 *
 * Set whether wimlib can print error and warning messages to the error file,
 * which defaults to standard error.  Error and warning messages may provide
 * information that cannot be determined only from returned error codes.
 *
 * By default, error messages are not printed.
 *
 * This setting applies globally (it is not per-WIM).
 *
 * This can be called before wimlib_global_init().
 *
 * @param show_messages
 *      @c true if messages are to be printed; @c false if messages are not to
 *      be printed.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_UNSUPPORTED
 *      wimlib was compiled using the <c>--without-error-messages</c> option.
 */
extern int
wimlib_set_print_errors(bool show_messages);

/**
 * @ingroup G_modifying_wims
 *
 * Set basic information about a WIM.
 *
 * @param wim
 *      Pointer to the ::WIMStruct for a WIM.
 * @param info
 *      Pointer to a ::wimlib_wim_info structure that contains the information
 *      to set.  Only the information explicitly specified in the @p which flags
 *      need be valid.
 * @param which
 *      Flags that specify which information to set.  This is a bitwise OR of
 *      ::WIMLIB_CHANGE_READONLY_FLAG, ::WIMLIB_CHANGE_GUID,
 *      ::WIMLIB_CHANGE_BOOT_INDEX, and/or ::WIMLIB_CHANGE_RPFIX_FLAG.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_IMAGE_COUNT
 *      ::WIMLIB_CHANGE_BOOT_INDEX was specified, but
 *      ::wimlib_wim_info.boot_index did not specify 0 or a valid 1-based image
 *      index in the WIM.
 */
extern int
wimlib_set_wim_info(WIMStruct *wim, const struct wimlib_wim_info *info,
                    int which);

/**
 * @ingroup G_nonstandalone_wims
 *
 * Split a WIM into multiple parts.
 *
 * @param wim
 *      The ::WIMStruct for the WIM to split.
 * @param swm_name
 *      Name of the split WIM (SWM) file to create.  This will be the name of
 *      the first part.  The other parts will, by default, have the same name
 *      with 2, 3, 4, ..., etc.  appended before the suffix.  However, the exact
 *      names can be customized using the progress function.
 * @param part_size
 *      The maximum size per part, in bytes.  Unfortunately, it is not
 *      guaranteed that this will really be the maximum size per part, because
 *      some file resources in the WIM may be larger than this size, and the WIM
 *      file format provides no way to split up file resources among multiple
 *      WIMs.
 * @param write_flags
 *      Bitwise OR of relevant flags prefixed with @c WIMLIB_WRITE_FLAG.  These
 *      flags will be used to write each split WIM part.  Specify 0 here to get
 *      the default behavior.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.  This function
 * may return most error codes that can be returned by wimlib_write() as well as
 * the following error codes:
 *
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      @p swm_name was not a nonempty string, or @p part_size was 0.
 * @retval ::WIMLIB_ERR_UNSUPPORTED
 *      The WIM contains solid resources.  Splitting a WIM containing solid
 *      resources is not supported.
 *
 * If a progress function is registered with @p wim, then for each split WIM
 * part that is written it will receive the messages
 * ::WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART and
 * ::WIMLIB_PROGRESS_MSG_SPLIT_END_PART.
 */
extern int
wimlib_split(WIMStruct *wim,
             const wimlib_tchar *swm_name,
             uint64_t part_size,
             int write_flags);

/**
 * @ingroup G_general
 *
 * Perform verification checks on a WIM file.
 *
 * This function is intended for safety checking and/or debugging.  If used on a
 * well-formed WIM file, it should always succeed.
 *
 * @param wim
 *      The ::WIMStruct for the WIM file to verify.  Note: for an extra layer of
 *      verification, it is a good idea to have used
 *      ::WIMLIB_OPEN_FLAG_CHECK_INTEGRITY when you opened the file.
 *      <br/>
 *      If verifying a split WIM, specify the first part of the split WIM here,
 *      and reference the other parts using wimlib_reference_resource_files()
 *      before calling this function.
 * @param verify_flags
 *      Reserved; must be 0.
 *
 * @return 0 if the WIM file was successfully verified; a ::wimlib_error_code
 * value if it failed verification or another error occurred.
 *
 * @retval ::WIMLIB_ERR_DECOMPRESSION
 *      The WIM file contains invalid compressed data.
 * @retval ::WIMLIB_ERR_INVALID_METADATA_RESOURCE
 *      The metadata resource for an image is invalid.
 * @retval ::WIMLIB_ERR_INVALID_RESOURCE_HASH
 *      File data stored in the WIM file is corrupt.
 * @retval ::WIMLIB_ERR_RESOURCE_NOT_FOUND
 *      The data for a file in an image could not be found.  See @ref
 *      G_nonstandalone_wims.
 *
 * If a progress function is registered with @p wim, then it will receive the
 * following progress messages: ::WIMLIB_PROGRESS_MSG_BEGIN_VERIFY_IMAGE,
 * ::WIMLIB_PROGRESS_MSG_END_VERIFY_IMAGE, and
 * ::WIMLIB_PROGRESS_MSG_VERIFY_STREAMS.
 */
extern int
wimlib_verify_wim(WIMStruct *wim, int verify_flags);

/**
 * @ingroup G_mounting_wim_images
 *
 * Unmount a WIM image that was mounted using wimlib_mount_image().
 *
 * When unmounting a read-write mounted image, the default behavior is to
 * discard changes to the image.  Use ::WIMLIB_UNMOUNT_FLAG_COMMIT to cause the
 * image to be committed.
 *
 * @param dir
 *      The directory on which the WIM image is mounted.
 * @param unmount_flags
 *      Bitwise OR of flags prefixed with @p WIMLIB_UNMOUNT_FLAG.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_NOT_A_MOUNTPOINT
 *      There is no WIM image mounted on the specified directory.
 * @retval ::WIMLIB_ERR_MOUNTED_IMAGE_IS_BUSY
 *      The read-write mounted image cannot be committed because there are file
 *      descriptors open to it, and ::WIMLIB_UNMOUNT_FLAG_FORCE was not
 *      specified.
 * @retval ::WIMLIB_ERR_MQUEUE
 *      Could not create a POSIX message queue.
 * @retval ::WIMLIB_ERR_NOT_PERMITTED_TO_UNMOUNT
 *      The image was mounted by a different user.
 * @retval ::WIMLIB_ERR_UNSUPPORTED
 *      Mounting is not supported in this build of the library.
 *
 * Note: you can also unmount the image by using the @c umount() system call, or
 * by using the @c umount or @c fusermount programs.  However, you need to call
 * this function if you want changes to be committed.
 */
extern int
wimlib_unmount_image(const wimlib_tchar *dir, int unmount_flags);

/**
 * @ingroup G_mounting_wim_images
 *
 * Same as wimlib_unmount_image(), but allows specifying a progress function.
 * The progress function will receive a ::WIMLIB_PROGRESS_MSG_UNMOUNT_BEGIN
 * message.  In addition, if changes are committed from a read-write mount, the
 * progress function will receive ::WIMLIB_PROGRESS_MSG_WRITE_STREAMS messages.
 */
extern int
wimlib_unmount_image_with_progress(const wimlib_tchar *dir,
                                   int unmount_flags,
                                   wimlib_progress_func_t progfunc,
                                   void *progctx);

/**
 * @ingroup G_modifying_wims
 *
 * Update a WIM image by adding, deleting, and/or renaming files or directories.
 *
 * @param wim
 *      Pointer to the ::WIMStruct containing the image to update.
 * @param image
 *      The 1-based index of the image to update.
 * @param cmds
 *      An array of ::wimlib_update_command's that specify the update operations
 *      to perform.
 * @param num_cmds
 *      Number of commands in @p cmds.
 * @param update_flags
 *      ::WIMLIB_UPDATE_FLAG_SEND_PROGRESS or 0.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.  On failure,
 * all update commands will be rolled back, and no visible changes will have
 * been made to @p wim.
 *
 * @retval ::WIMLIB_ERR_FVE_LOCKED_VOLUME
 *      Windows-only: One of the "add" commands attempted to add files from an
 *      encrypted BitLocker volume that hasn't yet been unlocked.
 * @retval ::WIMLIB_ERR_IMAGE_HAS_MULTIPLE_REFERENCES
 *      There are currently multiple references to the image as a result of a
 *      call to wimlib_export_image().  Free one before attempting the update.
 * @retval ::WIMLIB_ERR_INVALID_CAPTURE_CONFIG
 *      The contents of a capture configuration file were invalid.
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p image did not exist in @p wim.
 * @retval ::WIMLIB_ERR_INVALID_OVERLAY
 *      An add command with ::WIMLIB_ADD_FLAG_NO_REPLACE specified attempted to
 *      replace an existing nondirectory file.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      An unknown operation type was provided in the update commands; or
 *      unknown or incompatible flags were provided in a flags parameter; or
 *      there was another problem with the provided parameters.
 * @retval ::WIMLIB_ERR_INVALID_REPARSE_DATA
 *      While executing an add command, a reparse point had invalid data.
 * @retval ::WIMLIB_ERR_IS_DIRECTORY
 *      An add command attempted to replace a directory with a non-directory; or
 *      a delete command without ::WIMLIB_DELETE_FLAG_RECURSIVE attempted to
 *      delete a directory; or a rename command attempted to rename a directory
 *      to a non-directory.
 * @retval ::WIMLIB_ERR_NOTDIR
 *      An add command attempted to replace a non-directory with a directory; or
 *      an add command attempted to set the root of the image to a
 *      non-directory; or a rename command attempted to rename a directory to a
 *      non-directory; or a component of an image path that was used as a
 *      directory was not, in fact, a directory.
 * @retval ::WIMLIB_ERR_NOTEMPTY
 *      A rename command attempted to rename a directory to a non-empty
 *      directory; or a rename command would have created a loop.
 * @retval ::WIMLIB_ERR_NTFS_3G
 *      While executing an add command with ::WIMLIB_ADD_FLAG_NTFS specified, an
 *      error occurred while reading data from the NTFS volume using libntfs-3g.
 * @retval ::WIMLIB_ERR_OPEN
 *      Failed to open a file to be captured while executing an add command.
 * @retval ::WIMLIB_ERR_OPENDIR
 *      Failed to open a directory to be captured while executing an add
 *      command.
 * @retval ::WIMLIB_ERR_PATH_DOES_NOT_EXIST
 *      A delete command without ::WIMLIB_DELETE_FLAG_FORCE specified was for a
 *      WIM path that did not exist; or a rename command attempted to rename a
 *      file that does not exist.
 * @retval ::WIMLIB_ERR_READ
 *      While executing an add command, failed to read data from a file or
 *      directory to be captured.
 * @retval ::WIMLIB_ERR_READLINK
 *      While executing an add command, failed to read the target of a symbolic
 *      link, junction, or other reparse point.
 * @retval ::WIMLIB_ERR_STAT
 *      While executing an add command, failed to read metadata for a file or
 *      directory.
 * @retval ::WIMLIB_ERR_UNABLE_TO_READ_CAPTURE_CONFIG
 *      A capture configuration file could not be read.
 * @retval ::WIMLIB_ERR_UNSUPPORTED
 *      A command had flags provided that are not supported on this platform or
 *      in this build of the library.
 * @retval ::WIMLIB_ERR_UNSUPPORTED_FILE
 *      An add command with ::WIMLIB_ADD_FLAG_NO_UNSUPPORTED_EXCLUDE specified
 *      discovered a file that was not of a supported type.
 *
 * This function can additionally return ::WIMLIB_ERR_DECOMPRESSION,
 * ::WIMLIB_ERR_INVALID_METADATA_RESOURCE, ::WIMLIB_ERR_METADATA_NOT_FOUND,
 * ::WIMLIB_ERR_READ, or ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE, all of which
 * indicate failure (for different reasons) to read the metadata resource for an
 * image that needed to be updated.
 */
extern int
wimlib_update_image(WIMStruct *wim,
                    int image,
                    const struct wimlib_update_command *cmds,
                    size_t num_cmds,
                    int update_flags);

/**
 * @ingroup G_writing_and_overwriting_wims
 *
 * Persist a ::WIMStruct to a new on-disk WIM file.
 *
 * This brings in file data from any external locations, such as directory trees
 * or NTFS volumes scanned with wimlib_add_image(), or other WIM files via
 * wimlib_export_image(), and incorporates it into a new on-disk WIM file.
 *
 * By default, the new WIM file is written as stand-alone.  Using the
 * ::WIMLIB_WRITE_FLAG_SKIP_EXTERNAL_WIMS flag, a "delta" WIM can be written
 * instead.  However, this function cannot directly write a "split" WIM; use
 * wimlib_split() for that.
 *
 * @param wim
 *      Pointer to the ::WIMStruct being persisted.
 * @param path
 *      The path to the on-disk file to write.
 * @param image
 *      Normally, specify ::WIMLIB_ALL_IMAGES here.  This indicates that all
 *      images are to be included in the new on-disk WIM file.  If for some
 *      reason you only want to include a single image, specify the 1-based
 *      index of that image instead.
 * @param write_flags
 *      Bitwise OR of flags prefixed with @c WIMLIB_WRITE_FLAG.
 * @param num_threads
 *      The number of threads to use for compressing data, or 0 to have the
 *      library automatically choose an appropriate number.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_CONCURRENT_MODIFICATION_DETECTED
 *      A file that had previously been scanned for inclusion in the WIM was
 *      concurrently modified.
 * @retval ::WIMLIB_ERR_INVALID_IMAGE
 *      @p image did not exist in @p wim.
 * @retval ::WIMLIB_ERR_INVALID_RESOURCE_HASH
 *      A file, stored in another WIM, which needed to be written was corrupt.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      @p path was not a nonempty string, or invalid flags were passed.
 * @retval ::WIMLIB_ERR_OPEN
 *      Failed to open the output WIM file for writing, or failed to open a file
 *      whose data needed to be included in the WIM.
 * @retval ::WIMLIB_ERR_READ
 *      Failed to read data that needed to be included in the WIM.
 * @retval ::WIMLIB_ERR_RESOURCE_NOT_FOUND
 *      A file data blob that needed to be written could not be found in the
 *      blob lookup table of @p wim.  See @ref G_nonstandalone_wims.
 * @retval ::WIMLIB_ERR_WRITE
 *      An error occurred when trying to write data to the new WIM file.
 *
 * This function can additionally return ::WIMLIB_ERR_DECOMPRESSION,
 * ::WIMLIB_ERR_INVALID_METADATA_RESOURCE, ::WIMLIB_ERR_METADATA_NOT_FOUND,
 * ::WIMLIB_ERR_READ, or ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE, all of which
 * indicate failure (for different reasons) to read the data from a WIM file.
 *
 * If a progress function is registered with @p wim, then it will receive the
 * messages ::WIMLIB_PROGRESS_MSG_WRITE_STREAMS,
 * ::WIMLIB_PROGRESS_MSG_WRITE_METADATA_BEGIN, and
 * ::WIMLIB_PROGRESS_MSG_WRITE_METADATA_END.
 */
extern int
wimlib_write(WIMStruct *wim,
             const wimlib_tchar *path,
             int image,
             int write_flags,
             unsigned num_threads);

/**
 * @ingroup G_writing_and_overwriting_wims
 *
 * Same as wimlib_write(), but write the WIM directly to a file descriptor,
 * which need not be seekable if the write is done in a special pipable WIM
 * format by providing ::WIMLIB_WRITE_FLAG_PIPABLE in @p write_flags.  This can,
 * for example, allow capturing a WIM image and streaming it over the network.
 * See @ref subsec_pipable_wims for more information about pipable WIMs.
 *
 * The file descriptor @p fd will @b not be closed when the write is complete;
 * the calling code is responsible for this.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.  The possible
 * error codes include those that can be returned by wimlib_write() as well as
 * the following:
 *
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      @p fd was not seekable, but ::WIMLIB_WRITE_FLAG_PIPABLE was not
 *      specified in @p write_flags.
 */
extern int
wimlib_write_to_fd(WIMStruct *wim,
                   int fd,
                   int image,
                   int write_flags,
                   unsigned num_threads);

/**
 * @defgroup G_compression Compression and decompression functions
 *
 * @brief Functions for XPRESS, LZX, and LZMS compression and decompression.
 *
 * These functions are already used by wimlib internally when appropriate for
 * reading and writing WIM archives.  But they are exported and documented so
 * that they can be used in other applications or libraries for general-purpose
 * lossless data compression.  They are implemented in highly optimized C code,
 * using state-of-the-art compression techniques.  The main limitation is the
 * lack of sliding window support; this has, however, allowed the algorithms to
 * be optimized for block-based compression.
 *
 * @{
 */

/** Opaque compressor handle.  */
struct wimlib_compressor;

/** Opaque decompressor handle.  */
struct wimlib_decompressor;

/**
 * Set the default compression level for the specified compression type.  This
 * is the compression level that wimlib_create_compressor() assumes if it is
 * called with @p compression_level specified as 0.
 *
 * wimlib's WIM writing code (e.g. wimlib_write()) will pass 0 to
 * wimlib_create_compressor() internally.  Therefore, calling this function will
 * affect the compression level of any data later written to WIM files using the
 * specified compression type.
 *
 * The initial state, before this function is called, is that all compression
 * types have a default compression level of 50.
 *
 * @param ctype
 *      Compression type for which to set the default compression level, as one
 *      of the ::wimlib_compression_type constants.  Or, if this is the special
 *      value -1, the default compression levels for all compression types will
 *      be set.
 * @param compression_level
 *      The default compression level to set.  If 0, the "default default" level
 *      of 50 is restored.  Otherwise, a higher value indicates higher
 *      compression, whereas a lower value indicates lower compression.  See
 *      wimlib_create_compressor() for more information.
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INVALID_COMPRESSION_TYPE
 *      @p ctype was neither a supported compression type nor -1.
 */
extern int
wimlib_set_default_compression_level(int ctype, unsigned int compression_level);

/**
 * Return the approximate number of bytes needed to allocate a compressor with
 * wimlib_create_compressor() for the specified compression type, maximum block
 * size, and compression level.  @p compression_level may be 0, in which case
 * the current default compression level for @p ctype is used.  Returns 0 if the
 * compression type is invalid, or the @p max_block_size for that compression
 * type is invalid.
 */
extern uint64_t
wimlib_get_compressor_needed_memory(enum wimlib_compression_type ctype,
                                    size_t max_block_size,
                                    unsigned int compression_level);

#define WIMLIB_COMPRESSOR_FLAG_DESTRUCTIVE      0x80000000

/**
 * Allocate a compressor for the specified compression type using the specified
 * parameters.  This function is part of wimlib's compression API; it is not
 * necessary to call this to process a WIM file.
 *
 * @param ctype
 *      Compression type for which to create the compressor, as one of the
 *      ::wimlib_compression_type constants.
 * @param max_block_size
 *      The maximum compression block size to support.  This specifies the
 *      maximum allowed value for the @p uncompressed_size parameter of
 *      wimlib_compress() when called using this compressor.
 *      <br/>
 *      Usually, the amount of memory used by the compressor will scale in
 *      proportion to the @p max_block_size parameter.
 *      wimlib_get_compressor_needed_memory() can be used to query the specific
 *      amount of memory that will be required.
 *      <br/>
 *      This parameter must be at least 1 and must be less than or equal to a
 *      compression-type-specific limit.
 *      <br/>
 *      In general, the same value of @p max_block_size must be passed to
 *      wimlib_create_decompressor() when the data is later decompressed.
 *      However, some compression types have looser requirements regarding this.
 * @param compression_level
 *      The compression level to use.  If 0, the default compression level (50,
 *      or another value as set through wimlib_set_default_compression_level())
 *      is used.  Otherwise, a higher value indicates higher compression.  The
 *      values are scaled so that 10 is low compression, 50 is medium
 *      compression, and 100 is high compression.  This is not a percentage;
 *      values above 100 are also valid.
 *      <br/>
 *      Using a higher-than-default compression level can result in a better
 *      compression ratio, but can significantly reduce performance.  Similarly,
 *      using a lower-than-default compression level can result in better
 *      performance, but can significantly worsen the compression ratio.  The
 *      exact results will depend heavily on the compression type and what
 *      algorithms are implemented for it.  If you are considering using a
 *      non-default compression level, you should run benchmarks to see if it is
 *      worthwhile for your application.
 *      <br/>
 *      The compression level does not affect the format of the compressed data.
 *      Therefore, it is a compressor-only parameter and does not need to be
 *      passed to the decompressor.
 *      <br/>
 *      Since wimlib v1.8.0, this parameter can be OR-ed with the flag
 *      ::WIMLIB_COMPRESSOR_FLAG_DESTRUCTIVE.  This creates the compressor in a
 *      mode where it is allowed to modify the input buffer.  Specifically, in
 *      this mode, if compression succeeds, the input buffer may have been
 *      modified, whereas if compression does not succeed the input buffer still
 *      may have been written to but will have been restored exactly to its
 *      original state.  This mode is designed to save some memory when using
 *      large buffer sizes.
 * @param compressor_ret
 *      A location into which to return the pointer to the allocated compressor.
 *      The allocated compressor can be used for any number of calls to
 *      wimlib_compress() before being freed with wimlib_free_compressor().
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INVALID_COMPRESSION_TYPE
 *      @p ctype was not a supported compression type.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      @p max_block_size was invalid for the compression type, or @p
 *      compressor_ret was @c NULL.
 * @retval ::WIMLIB_ERR_NOMEM
 *      Insufficient memory to allocate the compressor.
 */
extern int
wimlib_create_compressor(enum wimlib_compression_type ctype,
                         size_t max_block_size,
                         unsigned int compression_level,
                         struct wimlib_compressor **compressor_ret);

/**
 * Compress a buffer of data.
 *
 * @param uncompressed_data
 *      Buffer containing the data to compress.
 * @param uncompressed_size
 *      Size, in bytes, of the data to compress.  This cannot be greater than
 *      the @p max_block_size with which wimlib_create_compressor() was called.
 *      (If it is, the data will not be compressed and 0 will be returned.)
 * @param compressed_data
 *      Buffer into which to write the compressed data.
 * @param compressed_size_avail
 *      Number of bytes available in @p compressed_data.
 * @param compressor
 *      A compressor previously allocated with wimlib_create_compressor().
 *
 * @return
 *      The size of the compressed data, in bytes, or 0 if the data could not be
 *      compressed to @p compressed_size_avail or fewer bytes.
 */
extern size_t
wimlib_compress(const void *uncompressed_data, size_t uncompressed_size,
                void *compressed_data, size_t compressed_size_avail,
                struct wimlib_compressor *compressor);

/**
 * Free a compressor previously allocated with wimlib_create_compressor().
 *
 * @param compressor
 *      The compressor to free.  If @c NULL, no action is taken.
 */
extern void
wimlib_free_compressor(struct wimlib_compressor *compressor);

/**
 * Allocate a decompressor for the specified compression type.  This function is
 * part of wimlib's compression API; it is not necessary to call this to process
 * a WIM file.
 *
 * @param ctype
 *      Compression type for which to create the decompressor, as one of the
 *      ::wimlib_compression_type constants.
 * @param max_block_size
 *      The maximum compression block size to support.  This specifies the
 *      maximum allowed value for the @p uncompressed_size parameter of
 *      wimlib_decompress().
 *      <br/>
 *      In general, this parameter must be the same as the @p max_block_size
 *      that was passed to wimlib_create_compressor() when the data was
 *      compressed.  However, some compression types have looser requirements
 *      regarding this.
 * @param decompressor_ret
 *      A location into which to return the pointer to the allocated
 *      decompressor.  The allocated decompressor can be used for any number of
 *      calls to wimlib_decompress() before being freed with
 *      wimlib_free_decompressor().
 *
 * @return 0 on success; a ::wimlib_error_code value on failure.
 *
 * @retval ::WIMLIB_ERR_INVALID_COMPRESSION_TYPE
 *      @p ctype was not a supported compression type.
 * @retval ::WIMLIB_ERR_INVALID_PARAM
 *      @p max_block_size was invalid for the compression type, or @p
 *      decompressor_ret was @c NULL.
 * @retval ::WIMLIB_ERR_NOMEM
 *      Insufficient memory to allocate the decompressor.
 */
extern int
wimlib_create_decompressor(enum wimlib_compression_type ctype,
                           size_t max_block_size,
                           struct wimlib_decompressor **decompressor_ret);

/**
 * Decompress a buffer of data.
 *
 * @param compressed_data
 *      Buffer containing the data to decompress.
 * @param compressed_size
 *      Size, in bytes, of the data to decompress.
 * @param uncompressed_data
 *      Buffer into which to write the uncompressed data.
 * @param uncompressed_size
 *      Size, in bytes, of the data when uncompressed.  This cannot exceed the
 *      @p max_block_size with which wimlib_create_decompressor() was called.
 *      (If it does, the data will not be decompressed and a nonzero value will
 *      be returned.)
 * @param decompressor
 *      A decompressor previously allocated with wimlib_create_decompressor().
 *
 * @return 0 on success; nonzero on failure.
 *
 * No specific error codes are defined; any nonzero value indicates that the
 * decompression failed.  This can only occur if the data is truly invalid;
 * there will never be transient errors like "out of memory", for example.
 *
 * This function requires that the exact uncompressed size of the data be passed
 * as the @p uncompressed_size parameter.  If this is not done correctly,
 * decompression may fail or the data may be decompressed incorrectly.
 */
extern int
wimlib_decompress(const void *compressed_data, size_t compressed_size,
                  void *uncompressed_data, size_t uncompressed_size,
                  struct wimlib_decompressor *decompressor);

/**
 * Free a decompressor previously allocated with wimlib_create_decompressor().
 *
 * @param decompressor
 *      The decompressor to free.  If @c NULL, no action is taken.
 */
extern void
wimlib_free_decompressor(struct wimlib_decompressor *decompressor);


/**
 * @}
 */


#ifdef __cplusplus
}
#endif

#endif /* _WIMLIB_H */