X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=include%2Fwimlib.h;h=49bbffed1729ccc3b2885fcd59c71bb25b8b5a39;hp=6f0e45fe2289357f41f1bd32c1f0294e506b9a31;hb=4f9ccdbed3ee79171d0b861c4ba93b54ce8feaac;hpb=a933b4cc3f0bb93093287e353df8bebb2b714a42 diff --git a/include/wimlib.h b/include/wimlib.h index 6f0e45fe..49bbffed 100644 --- a/include/wimlib.h +++ b/include/wimlib.h @@ -4,7 +4,9 @@ * * This file contains extensive comments for generating documentation with * Doxygen. The built HTML documentation can be viewed at - * http://wimlib.sourceforge.net. + * http://wimlib.sourceforge.net. Make sure to see the Modules page to make more sense of the declarations + * in this header. */ /* @@ -26,17 +28,18 @@ * along with wimlib; if not, see http://www.gnu.org/licenses/. */ -/** \mainpage +/** + * @mainpage * - * \section intro Introduction + * @section sec_intro Introduction * - * This is the documentation for the library interface of wimlib 1.5.0, a C + * This is the documentation for the library interface of wimlib 1.5.3, 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 README file or manual pages. * - * \section installing_and_compiling Installing and Compiling + * @section sec_installing_and_compiling Installing and Compiling * * wimlib uses the GNU autotools, so, on UNIX-like systems, it should be easy to * install with configure && make && sudo make install; however, @@ -51,13 +54,14 @@ * wimlib_global_init() can (and in some cases, must) be called. See its * documentation for more details. * - * \section basic_wim_handling_concepts Basic WIM handling concepts + * @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: wimlib_open_wim(), which opens a WIM * file and creates a ::WIMStruct representing it, and wimlib_create_new_wim(), * which creates a new ::WIMStruct that initially contains no images and does - * not yet have a backing on-disk file. + * not yet have a backing on-disk file. See @ref G_creating_and_opening_wims + * for more details. * * A WIM file, represented by a ::WIMStruct, contains zero or more images. * Images can be extracted (or "applied") using wimlib_extract_image(), added @@ -67,7 +71,8 @@ * 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. + * wimlib_overwrite() can be used instead. See @ref G_extracting_wims, @ref + * G_modifying_wims, and @ref G_writing_and_overwriting_wims for more details. * * Note that with this ::WIMStruct abstraction, performing many tasks on WIM * files is a multi-step process. For example, to add, or "append" an image to @@ -83,14 +88,14 @@ * you can make multiple changes to a WIM and commit them all to the underlying * file in only one overwrite operation, which is more efficient. * - * \section cleaning_up Cleaning up + * @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 error_handling Error Handling + * @section sec_error_handling Error Handling * * Most functions in wimlib return 0 on success and a positive error code on * failure. Use wimlib_get_error_string() to get a string that describes an @@ -101,7 +106,7 @@ * Currently, error messages and strings (as well as all documentation, for that * matter) are only available in English. * - * \section encodings Locales and character encodings + * @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 @@ -116,11 +121,93 @@ * default, wimlib on UNIX will assume the locale is UTF-8 capable unless you * call wimlib_global_init() after having set your desired locale. * - * \section advanced Additional information and features + * @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 --pipable flag of wimlib-imagex + * capture for more information about pipable WIMs. + * + * @subsection subsec_thread_safety Thread Safety + * + * wimlib is thread-safe, with the following exceptions: + * - Different threads cannot operate on the same ::WIMStruct at the same time; + * they must use different ::WIMStruct's. + * - You must call wimlib_global_init() in one thread before calling any other + * functions. + * - wimlib_set_print_errors() and wimlib_set_memory_allocator() both apply globally. + * - wimlib_mount_image(), while it can be used to mount multiple WIMs + * concurrently in the same process, will daemonize the entire process when it + * does so for the first time. This includes changing the working directory + * to the root directory. + * + * @subsection subsec_limitations Limitations + * + * This section documents some technical limitations of wimlib not already + * documented in the man page for @b wimlib-imagex. + * + * - The old WIM format from Vista pre-releases is not supported. + * - Compressed resource chunk sizes other than 32768 are not supported. This + * doesn't seem to be a real problem because the chunk size always seems to be + * this value. + * - 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 manual pages for + * wimlib-imagex, since not all relevant information is repeated here in + * the API documentation. + */ + +/** @defgroup G_general General * - * \subsection image_addition Image addition/capture + * @brief Declarations and structures shared across the library. + */ + +/** @defgroup G_creating_and_opening_wims Creating and Opening WIMs * - * As described in \ref basic_wim_handling_concepts, capturing a new WIM or + * @brief Create new WIMs and open existing WIMs. + */ + +/** @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 WIM. + * + * @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 @@ -141,7 +228,31 @@ * Note that some details of how image addition/capture works are documented * more fully in the manual page for wimlib-imagex capture. * - * \subsection extraction Image extraction/application + * @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_name(), wimlib_set_image_descripton(), and + * wimlib_set_image_flags() 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, as usual, by a ::WIMStruct). This normally extracts the image @@ -155,30 +266,16 @@ * certain files or directories from a WIM image, instead of a full image. * * A third function, wimlib_extract_image_from_pipe(), allows an image to be - * extracted from a pipable WIM sent over a pipe; see \ref pipable_wims. + * extracted from a pipable WIM sent over a pipe; see @ref subsec_pipable_wims. * * Note that some details of how image extraction/application works are * documented more fully in the manual pages for wimlib-imagex apply and * wimlib-imagex extract. + */ + +/** @defgroup G_mounting_wim_images Mounting WIM images * - * \subsection non_standalone_wims Non-standalone WIMs - * - * Earlier it was stated that a ::WIMStruct represents a WIM file, but there's a - * bit more to it than that. Normally, WIM files are "standalone". However, - * WIM files 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_files(). - * This is done by calling wimlib_reference_resource_files() or - * wimlib_reference_resources(). - * - * wimlib_write() can create delta WIMs as well as standalone WIMs, but a - * specialized function (wimlib_split()) is needed to create a split WIM. - * - * \subsection mounting_wim_images Mounting WIM images + * @brief Mount and unmount WIM images. * * On UNIX-like systems supporting FUSE (such as Linux), wimlib supports * mounting images from WIM files either read-only or read-write. To mount an @@ -188,8 +285,11 @@ * compiled with the --without-fuse flag, these functions will be * available but will fail with ::WIMLIB_ERR_UNSUPPORTED. Note that mounting an * image read-write is an alternative to calling wimlib_update_image(). + */ + +/** @defgroup G_progress Progress Messages * - * \subsection progress_functions Progress Functions + * @brief Track the progress of long WIM operations. * * When operating on large archives, operations such as extraction will * naturally take a while to complete. Because of this and to improve the @@ -198,55 +298,42 @@ * function will be called periodically during the WIM operation(s) to report on * the progress of the operation (for example, how many bytes have been written * so far). + */ + +/** @defgroup G_writing_and_overwriting_wims Writing and Overwriting WIMs * - * \subsection 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 --pipable flag of wimlib-imagex - * capture for more information about pipable WIMs. - * - * \subsection thread_safety Thread Safety + * @brief Write and overwrite on-disk WIM files. * - * wimlib is thread-safe, with the following exceptions: - * - Different threads cannot operate on the same ::WIMStruct at the same time; - * they must use different ::WIMStruct's. - * - You must call wimlib_global_init() in one thread before calling any other - * functions. - * - wimlib_set_print_errors() and wimlib_set_memory_allocator() both apply globally. - * - wimlib_mount_image(), while it can be used to mount multiple WIMs - * concurrently in the same process, will daemonize the entire process when it - * does so for the first time. This includes changing the working directory - * to the root directory. - * - * \subsection limitations Limitations + * As described in @ref sec_basic_wim_handling_concepts, these functions are + * critical to the design of the library as they allow new or modified WIMs to + * actually be written to on-disk files. Generally, wimlib_write() is the + * function you need to call to write a new WIM file, and wimlib_overwrite() is + * the function you need to call to persistently update an existing WIM file. + */ + +/** @defgroup G_nonstandalone_wims Creating and handling non-standalone WIMs * - * This section documents some technical limitations of wimlib not already - * documented in the man page for @b wimlib-imagex. + * @brief Create and handle non-standalone WIMs, such as split and delta WIMs. * - * - The old WIM format from Vista pre-releases is not supported. - * - Compressed resource chunk sizes other than 32768 are not supported. This - * doesn't seem to be a real problem because the chunk size always seems to be - * this value. - * - 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. + * Normally, ::WIMStruct represents a WIM file, but there's a bit more to it + * than that. Normally, WIM files are "standalone". However, WIM files 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_files(). This is done by + * calling wimlib_reference_resource_files() or wimlib_reference_resources(). * - * \subsection more_info More information + * wimlib_write() can create delta WIMs as well as standalone WIMs, but a + * specialized function (wimlib_split()) is needed to create a split WIM. + */ + +/** @defgroup G_compression Compression and decompression functions * - * You are advised to read the README as well as the manual pages for - * wimlib-imagex, since not all relevant information is repeated here in - * the API documentation. + * @brief Functions for LZX and XPRESS compression and decompression, exported + * for convenience only. These functions normally do not need to be used. */ #ifndef _WIMLIB_H @@ -258,19 +345,26 @@ #include #include -/** Major version of the library (for example, the 1 in 1.2.5). */ +/** @ingroup 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 5 /** Patch version of the library (for example, the 5 in 1.2.5). */ -#define WIMLIB_PATCH_VERSION 0 +#define WIMLIB_PATCH_VERSION 3 #ifdef __cplusplus extern "C" { #endif +/** @} */ +/** @ingroup G_general + * @{ */ + /** * Opaque structure that represents a WIM file. This is an in-memory structure * and need not correspond to a specific on-disk file. However, a ::WIMStruct @@ -283,6 +377,8 @@ extern "C" { * * Use wimlib_write() or wimlib_overwrite() to actually write an on-disk WIM * file from a ::WIMStruct. + * + * See @ref sec_basic_wim_handling_concepts for more information. */ #ifndef WIMLIB_WIMSTRUCT_DECLARED typedef struct WIMStruct WIMStruct; @@ -292,7 +388,7 @@ typedef struct WIMStruct WIMStruct; #ifdef __WIN32__ typedef wchar_t wimlib_tchar; #else -/** See \ref encodings */ +/** See @ref sec_encodings */ typedef char wimlib_tchar; #endif @@ -331,6 +427,10 @@ enum wimlib_compression_type { WIMLIB_COMPRESSION_TYPE_XPRESS = 2, }; +/** @} */ +/** @ingroup G_progress + * @{ */ + /** Possible values of the first parameter to the user-supplied * ::wimlib_progress_func_t progress function */ enum wimlib_progress_msg { @@ -684,6 +784,10 @@ union wimlib_progress_info { typedef int (*wimlib_progress_func_t)(enum wimlib_progress_msg msg_type, const union wimlib_progress_info *info); +/** @} */ +/** @ingroup 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 { @@ -766,6 +870,10 @@ struct wimlib_capture_config { * reparse-point fixups by default when capturing or applying WIM images. */ #define WIMLIB_CHANGE_RPFIX_FLAG 0x00000008 +/** @} */ +/** @ingroup G_wim_information + * @{ */ + /** General information about a WIM file. */ struct wimlib_wim_info { @@ -998,14 +1106,6 @@ typedef int (*wimlib_iterate_dir_tree_callback_t)(const struct wimlib_dir_entry typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resource_entry *resource, void *user_ctx); -/** - * @name Directory tree iteration flags - * - * The following flags can be passed to wimlib_iterate_dir_tree(). - * - * @{ - */ - /** For wimlib_iterate_dir_tree(): Iterate recursively on children rather than * just on the specified path. */ #define WIMLIB_ITERATE_DIR_TREE_FLAG_RECURSIVE 0x00000001 @@ -1022,15 +1122,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour #define WIMLIB_ITERATE_DIR_TREE_FLAG_RESOURCES_NEEDED 0x00000004 -/** - * @name Add flags - * - * The following flags can be passed to wimlib_add_image(), - * wimlib_add_image_multisource(), and add commands passed to - * wimlib_update_image(). - * - * @{ - */ +/** @} */ +/** @ingroup G_modifying_wims + * @{ */ /** Directly capture a NTFS volume rather than a generic directory. This flag * cannot be combined with ::WIMLIB_ADD_FLAG_DEREFERENCE or @@ -1129,14 +1223,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour WIMLIB_ADD_FLAG_NO_UNSUPPORTED_EXCLUDE #define WIMLIB_ADD_IMAGE_FLAG_WINCONFIG WIMLIB_ADD_FLAG_WINCONFIG -/** - * @name Delete flags - * - * The following flags can be specified in delete commands passed to - * wimlib_update_image(). - * - * @{ - */ +/** @} */ +/** @ingroup G_modifying_wims + * @{ */ /** Do not issue an error if the path to delete does not exist. */ #define WIMLIB_DELETE_FLAG_FORCE 0x00000001 @@ -1145,13 +1234,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour * issued if the path to delete is a directory. */ #define WIMLIB_DELETE_FLAG_RECURSIVE 0x00000002 -/** - * @name Export flags - * - * The following flags can be passed to wimlib_export_image(). - * - * @{ - */ +/** @} */ +/** @ingroup G_modifying_wims + * @{ */ /** * If a single image is being exported, mark it bootable in the destination WIM. @@ -1169,14 +1254,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour /** Give the exported image(s) no descriptions. */ #define WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS 0x00000004 -/** - * @name Extract flags - * - * The following flags can be passed to wimlib_extract_image(), - * wimlib_extract_files(), and wimlib_extract_image_from_pipe(). - * - * @{ - */ +/** @} */ +/** @ingroup G_extracting_wims + * @{ */ /** Extract the image directly to a NTFS volume rather than a generic directory. * This mode is only available if wimlib was compiled with libntfs-3g support; @@ -1262,13 +1342,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour * behavior is currently less than satisfactory. Do not use (yet). */ #define WIMLIB_EXTRACT_FLAG_RESUME 0x00010000 -/** - * @name Mount flags - * - * The following flags can be passed to wimlib_mount_image(). - * - * @{ - */ +/** @} */ +/** @ingroup G_mounting_wim_images + * @{ */ /** Mount the WIM image read-write rather than the default of read-only. */ #define WIMLIB_MOUNT_FLAG_READWRITE 0x00000001 @@ -1295,13 +1371,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour * allow_other option to FUSE mount) */ #define WIMLIB_MOUNT_FLAG_ALLOW_OTHER 0x00000040 -/** - * @name Open flags - * - * The following flags can be passed to wimlib_open_wim() and several other - * functions such as wimlib_join(). - * @{ - */ +/** @} */ +/** @ingroup G_creating_and_opening_wims + * @{ */ /** Verify the WIM contents against the WIM's integrity table, if present. This * causes the raw data of the WIM file, divided into 10 MB chunks, to be @@ -1311,7 +1383,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour * integrity table is invalid). */ #define WIMLIB_OPEN_FLAG_CHECK_INTEGRITY 0x00000001 -/** Issue an error if the WIM is part of a split WIM. */ +/** Issue an error 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 return ::WIMLIB_ERR_WIM_IS_READONLY if it @@ -1322,12 +1396,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour * an error sooner rather than later. */ #define WIMLIB_OPEN_FLAG_WRITE_ACCESS 0x00000004 -/** - * @name Unmount flags - * - * The following flags can be passed to wimlib_unmount_image(). - * @{ - */ +/** @} */ +/** @ingroup G_mounting_wim_images + * @{ */ /** See ::WIMLIB_WRITE_FLAG_CHECK_INTEGRITY. */ #define WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY 0x00000001 @@ -1345,24 +1416,17 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour /** Do a "lazy" unmount (detach filesystem immediately, even if busy). */ #define WIMLIB_UNMOUNT_FLAG_LAZY 0x00000010 -/** - * @name Update flags - * - * The following flags can be passed to wimlib_update_image(). - * @{ - */ +/** @} */ +/** @ingroup 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 -/** - * @name Write flags - * - * The following flags can be passed to wimlib_write(), wimlib_overwrite(), - * wimlib_write_to_fd(), and several other functions such as wimlib_join(). - * @{ - */ +/** @} */ +/** @ingroup G_writing_and_overwriting_wims + * @{ */ /** Include an integrity table in the WIM. * @@ -1437,12 +1501,11 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour * already implied for wimlib_overwrite(). */ #define WIMLIB_WRITE_FLAG_STREAMS_OK 0x00000400 -/** - * @name Init flags - * - * The following flags can be passed to wimlib_global_init(). - * @{ - */ +#define WIMLIB_WRITE_FLAG_RESERVED 0x00000800 + +/** @} */ +/** @ingroup G_general + * @{ */ /** Assume that strings are represented in UTF-8, even if this is not the * locale's character encoding. This flag is ignored on Windows, where wimlib @@ -1472,13 +1535,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour */ #define WIMLIB_INIT_FLAG_STRICT_APPLY_PRIVILEGES 0x00000008 -/** - * @name Resource reference flags - * - * The following flags can be passed to wimlib_reference_resource_files() and - * wimlib_reference_resources(). - * @{ - */ +/** @} */ +/** @ingroup G_nonstandalone_wims + * @{ */ /** wimlib_reference_resource_files() only: Enable shell-style filename * globbing. */ @@ -1492,9 +1551,9 @@ typedef int (*wimlib_iterate_lookup_table_callback_t)(const struct wimlib_resour * ::WIMLIB_REF_FLAG_GLOB_ENABLE is not also specified. */ #define WIMLIB_REF_FLAG_GLOB_ERR_ON_NOMATCH 0x00000002 -/** - * @} - */ +/** @} */ +/** @ingroup G_modifying_wims + * @{ */ /** The specific type of update to perform. */ enum wimlib_update_op { @@ -1566,7 +1625,12 @@ struct wimlib_update_command { }; }; -/** Specification of a file or directory tree to extract from a WIM image. */ +/** @} */ +/** @ingroup G_extracting_wims + * @{ */ + +/** Specification of a file or directory tree to extract from a WIM image. Used + * in calls to wimlib_extract_files(). */ struct wimlib_extract_command { /** Path to file or directory tree within the WIM image to extract. It * must be provided as an absolute path from the root of the WIM image. @@ -1580,6 +1644,102 @@ struct wimlib_extract_command { int extract_flags; }; +/** @} */ +/** @ingroup G_compression + * @{ */ + +/** LZX compression parameters to pass to wimlib_lzx_alloc_context(). */ +struct wimlib_lzx_params { + /** Must be set to the size of this structure, in bytes. */ + uint32_t size_of_this; + + /** Relatively fast LZX compression algorithm with a decent compression + * ratio; the suggested default. */ +#define WIMLIB_LZX_ALGORITHM_FAST 0 + + /** Slower LZX compression algorithm that provides a better compression + * ratio. */ +#define WIMLIB_LZX_ALGORITHM_SLOW 1 + + /** Algorithm to use to perform the compression: either + * ::WIMLIB_LZX_ALGORITHM_FAST or ::WIMLIB_LZX_ALGORITHM_SLOW. The + * format is still LZX; this refers to the method the code will use to + * perform LZX-compatible compression. */ + uint32_t algorithm : 3; + + /** If set to 1, the default parameters for the specified algorithm are + * used rather than the ones specified in the following union. */ + uint32_t use_defaults : 1; + + union { + /** Parameters for the fast algorithm. */ + struct wimlib_lzx_fast_params { + uint32_t fast_reserved1[10]; + } fast; + + /** Parameters for the slow algorithm. */ + struct wimlib_lzx_slow_params { + /** If set to 1, the compressor can output length 2 + * matches. If set 0, the compressor only outputs + * matches of length 3 or greater. Suggested value: 1 + */ + uint32_t use_len2_matches : 1; + + uint32_t slow_reserved1 : 31; + + /** Matches with length (in bytes) longer than this + * value are immediately taken without spending time on + * minimum-cost measurements. Suggested value: 32. */ + uint32_t num_fast_bytes; + + /** Number of passes to compute a match/literal sequence + * for each LZX block. This is for an iterative + * algorithm that attempts to minimize the cost of the + * match/literal sequence by using a cost model provided + * by the previous iteration. Must be at least 1. + * Suggested value: 2. */ + uint32_t num_optim_passes; + + /** Reserved; set to 0. */ + uint32_t slow_reserved_blocksplit; + + /** Maximum depth to search for matches at each + * position. Suggested value: 50. */ + uint32_t max_search_depth; + + /** Maximum number of potentially good matches to + * consider for each position. Suggested value: 3. */ + uint32_t max_matches_per_pos; + + uint32_t slow_reserved2[2]; + + /** Assumed cost of a main symbol with zero frequency. + * Must be at least 1 and no more than 16. Suggested + * value: 15. */ + uint8_t main_nostat_cost; + + /** Assumed cost of a length symbol with zero frequency. + * Must be at least 1 and no more than 16. Suggested + * value: 15. */ + uint8_t len_nostat_cost; + + /** Assumed cost of an aligned symbol with zero + * frequency. Must be at least 1 and no more than 8. + * Suggested value: 7. */ + uint8_t aligned_nostat_cost; + + uint8_t slow_reserved3[5]; + } slow; + } alg_params; +}; + +/** Opaque LZX compression context. */ +struct wimlib_lzx_context; + +/** @} */ +/** @ingroup G_general + * @{ */ + /** * Possible values of the error code returned by many functions in wimlib. * @@ -1671,6 +1831,8 @@ enum wimlib_error_code { #define WIMLIB_ALL_IMAGES (-1) /** + * @ingroup G_modifying_wims + * * Appends an empty image to a WIM file. This empty image will initially * contain no files or directories, although if written without further * modifications, a root directory will be created automatically for it. After @@ -1707,6 +1869,8 @@ wimlib_add_empty_image(WIMStruct *wim, int *new_idx_ret); /** + * @ingroup G_modifying_wims + * * Adds an image to a WIM file from an on-disk directory tree or NTFS volume. * * The directory tree or NTFS volume is scanned immediately to load the dentry @@ -1762,7 +1926,10 @@ wimlib_add_image(WIMStruct *wim, int add_flags, wimlib_progress_func_t progress_func); -/** This function is equivalent to wimlib_add_image() except it allows for +/** + * @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 @@ -1789,6 +1956,8 @@ wimlib_add_image_multisource(WIMStruct *wim, wimlib_progress_func_t progress_func); /** + * @ingroup G_creating_and_opening_wims + * * Creates a ::WIMStruct for a new WIM file. * * This only creates an in-memory structure for a WIM that initially contains no @@ -1814,6 +1983,8 @@ extern int wimlib_create_new_wim(int ctype, WIMStruct **wim_ret); /** + * @ingroup G_modifying_wims + * * Deletes an image, or all images, from a WIM file. * * All streams referenced by the image(s) being deleted are removed from the @@ -1853,6 +2024,8 @@ extern int wimlib_delete_image(WIMStruct *wim, int image); /** + * @ingroup G_modifying_wims + * * Exports an image, or all the images, from a WIM file, into another WIM file. * * The destination image is made to share the same dentry tree and security data @@ -1946,6 +2119,8 @@ wimlib_export_image(WIMStruct *src_wim, int src_image, wimlib_progress_func_t progress_func); /** + * @ingroup G_extracting_wims + * * Extract zero or more files or directory trees from a WIM image. * * This generalizes the single-image extraction functionality of @@ -2011,6 +2186,8 @@ wimlib_extract_files(WIMStruct *wim, wimlib_progress_func_t progress_func); /** + * @ingroup G_extracting_wims + * * Extracts an image, or all images, from a WIM to a directory or directly to a * NTFS volume image. * @@ -2136,6 +2313,8 @@ wimlib_extract_image(WIMStruct *wim, int image, wimlib_progress_func_t progress_func); /** + * @ingroup G_extracting_wims + * * Since wimlib v1.5.0: Extract one or more images from a pipe on which a * pipable WIM is being sent. * @@ -2186,9 +2365,13 @@ wimlib_extract_image_from_pipe(int pipe_fd, wimlib_progress_func_t progress_func); /** + * @ingroup G_wim_information + * * Extracts the XML data of a WIM file to a file stream. Every WIM file * includes a string of XML that describes the images contained in the WIM. * + * See wimlib_get_xml_data() to read the XML data into memory instead. + * * @param wim * Pointer to the ::WIMStruct for a WIM file, which does not necessarily * have to be standalone (e.g. it could be part of a split WIM). @@ -2209,6 +2392,8 @@ extern int wimlib_extract_xml_data(WIMStruct *wim, FILE *fp); /** + * @ingroup G_general + * * Frees all memory allocated for a WIMStruct and closes all files associated * with it. * @@ -2221,6 +2406,8 @@ extern void wimlib_free(WIMStruct *wim); /** + * @ingroup G_general + * * Converts a ::wimlib_compression_type value into a string. * * @param ctype @@ -2235,6 +2422,8 @@ extern const wimlib_tchar * wimlib_get_compression_type_string(int ctype); /** + * @ingroup G_general + * * Converts an error code into a string describing it. * * @param code @@ -2248,6 +2437,8 @@ extern const wimlib_tchar * wimlib_get_error_string(enum wimlib_error_code code); /** + * @ingroup G_wim_information + * * Returns the description of the specified image. * * @param wim @@ -2267,6 +2458,8 @@ extern const wimlib_tchar * wimlib_get_image_description(const WIMStruct *wim, int image); /** + * @ingroup G_wim_information + * * Returns the name of the specified image. * * @param wim @@ -2287,6 +2480,8 @@ wimlib_get_image_name(const WIMStruct *wim, int image); /** + * @ingroup G_wim_information + * * Get basic information about a WIM file. * * @param wim @@ -2302,6 +2497,38 @@ extern int wimlib_get_wim_info(WIMStruct *wim, struct wimlib_wim_info *info); /** + * @ingroup G_wim_information + * + * Read the XML data of a WIM file into an in-memory buffer. Every WIM file + * includes a string of XML that describes the images contained in the WIM. + * + * See wimlib_extract_xml_data() to extract the XML data to a file stream + * instead. + * + * @param wim + * Pointer to the ::WIMStruct for a WIM file, which does not necessarily + * have to be standalone (e.g. it could be part of a split WIM). + * @param buf_ret + * On success, a pointer to an allocated buffer containing the raw UTF16-LE + * XML data is written to this location. + * @param bufsize_ret + * The size of the XML data in bytes is written to this location. + * + * @return 0 on success; nonzero on error. + * @retval ::WIMLIB_ERR_INVALID_PARAM + * @p wim is not a ::WIMStruct that was created by wimlib_open_wim(), or + * @p buf_ret or @p bufsize_ret was @c NULL. + * @retval ::WIMLIB_ERR_NOMEM + * @retval ::WIMLIB_ERR_READ + * @retval ::WIMLIB_ERR_UNEXPECTED_END_OF_FILE + * Failed to read the XML data from the WIM. + */ +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 wimlib_set_print_errors(). If not done manually, this * function will be called automatically with @p init_flags set to @@ -2322,6 +2549,8 @@ 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. */ @@ -2329,6 +2558,8 @@ extern void wimlib_global_cleanup(void); /** + * @ingroup G_wim_information + * * Determines if an image name is already used by some image in the WIM. * * @param wim @@ -2345,6 +2576,8 @@ 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 the WIM image. By specifying * appropriate flags and a callback function, you can get the attributes of a * file in the WIM, get a directory listing, or even get a listing of the entire @@ -2400,6 +2633,8 @@ wimlib_iterate_dir_tree(WIMStruct *wim, int image, const wimlib_tchar *path, wimlib_iterate_dir_tree_callback_t cb, void *user_ctx); /** + * @ingroup G_wim_information + * * Iterate through the lookup table of a WIM file. This can be used to directly * get a listing of the unique resources contained in a WIM file over all * images. Both file resources and metadata resources are included. However, @@ -2433,6 +2668,8 @@ wimlib_iterate_lookup_table(WIMStruct *wim, int flags, void *user_ctx); /** + * @ingroup G_nonstandalone_wims + * * Joins a split WIM into a stand-alone one-part WIM. * * @param swms @@ -2478,6 +2715,8 @@ wimlib_join(const wimlib_tchar * const *swms, wimlib_progress_func_t progress_func); /** + * @ingroup G_compression + * * Compress a chunk of a WIM resource using LZX compression. * * This function is exported for convenience only and should only be used by @@ -2499,9 +2738,57 @@ wimlib_join(const wimlib_tchar * const *swms, * format and therefore requires (@p chunk_size <= 32768). */ extern unsigned -wimlib_lzx_compress(const void *chunk, unsigned chunk_size, void *out); +wimlib_lzx_compress(const void *chunk, unsigned chunk_size, void *out) + _wimlib_deprecated; /** + * @ingroup G_compression + * + * Equivalent to wimlib_lzx_compress(), but uses the specified compression + * context, allocated by wimlib_lzx_alloc_context(). + */ +extern unsigned +wimlib_lzx_compress2(const void *chunk, unsigned chunk_size, void *out, + struct wimlib_lzx_context *ctx); + +/** + * @ingroup G_compression + * + * Allocate a LZX compression context using the specified parameters. + * + * This function is exported for convenience only and should only be used by + * library clients looking to make use of wimlib's compression code for another + * purpose. + * + * @param window_size + * Size of the LZX window. Must be a power of 2 between 2^15 and 2^21, + * inclusively. + * + * @param params + * Compression parameters to use, or @c NULL to use the default parameters. + * + * @param ctx_ret + * A pointer to either @c NULL or an existing ::wimlib_lzx_context. If + * *ctx_ret == NULL, the new context is allocated. If + * *ctx_ret != NULL, the existing context is re-used if + * possible. Alternatively, this argument can itself be @c NULL to + * indicate that only parameter validation is to be performed. + * + * @return 0 on success; nonzero on error. + * + * @retval ::WIMLIB_ERR_INVALID_PARAM + * The window size or compression parameters were invalid. + * @retval ::WIMLIB_ERR_NOMEM + * Not enough memory to allocate the compression context. + */ +extern int +wimlib_lzx_alloc_context(uint32_t window_size, + const struct wimlib_lzx_params *params, + struct wimlib_lzx_context **ctx_pp); + +/** + * @ingroup G_compression + * * Decompresses a block of LZX-compressed data as used in the WIM file format. * * Note that this will NOT work unmodified for LZX as used in the cabinet @@ -2530,8 +2817,53 @@ extern int wimlib_lzx_decompress(const void *compressed_data, unsigned compressed_len, void *uncompressed_data, unsigned uncompressed_len); +extern int +wimlib_lzx_decompress2(const void *compressed_data, unsigned compressed_len, + void *uncompressed_data, unsigned uncompressed_len, + uint32_t max_window_size); + +/** + * @ingroup G_compression + * + * Free the specified LZX compression context, allocated with + * wimlib_lzx_alloc_context(). + */ +extern void +wimlib_lzx_free_context(struct wimlib_lzx_context *ctx); + +/** + * @ingroup G_compression + * + * Set the global default LZX compression parameters. + * + * @param params + * The LZX compression parameters to set. These default parameters will be + * used by any calls to wimlib_lzx_alloc_context() with @c NULL LZX + * parameters specified, as well as by any future compression performed by + * the library itself. Passing @p NULL here resets the default LZX + * parameters to their original value. + * + * @return 0 on success; nonzero on error. + * + * @retval ::WIMLIB_ERR_INVALID_PARAM + * The compression parameters were invalid. + */ +extern int +wimlib_lzx_set_default_params(const struct wimlib_lzx_params *params); + +/** + * @ingroup G_compression + * + * Free the specified LZX compression context, allocated with + * wimlib_lzx_alloc_context(). + */ +extern void +wimlib_lzx_free_context(struct wimlib_lzx_context *ctx); + /** + * @ingroup G_mounting_wim_images + * * Mounts an image in a WIM file on a directory read-only or read-write. * * As this is implemented using FUSE (Filesystme in UserSpacE), this is not @@ -2617,6 +2949,8 @@ wimlib_mount_image(WIMStruct *wim, const wimlib_tchar *staging_dir); /** + * @ingroup G_creating_and_opening_wims + * * Opens a WIM file and creates a ::WIMStruct for it. * * @param wim_file @@ -2695,6 +3029,8 @@ wimlib_open_wim(const wimlib_tchar *wim_file, wimlib_progress_func_t progress_func); /** + * @ingroup G_writing_and_overwriting_wims + * * Overwrites the file that the WIM was originally read from, with changes made. * This only makes sense for ::WIMStruct's obtained from wimlib_open_wim() * rather than wimlib_create_new_wim(). @@ -2772,6 +3108,8 @@ wimlib_overwrite(WIMStruct *wim, int write_flags, unsigned num_threads, wimlib_progress_func_t progress_func); /** + * @ingroup G_wim_information + * * Prints information about one image, or all images, contained in a WIM. * * @param wim @@ -2789,6 +3127,8 @@ extern void wimlib_print_available_images(const WIMStruct *wim, int image); /** + * @ingroup G_wim_information + * * Deprecated in favor of wimlib_get_wim_info(), which provides the information * in a way that can be accessed programatically. */ @@ -2796,6 +3136,8 @@ extern void wimlib_print_header(const WIMStruct *wim) _wimlib_deprecated; /** + * @ingroup G_wim_information + * * Deprecated in favor of wimlib_iterate_dir_tree(), which provides the * information in a way that can be accessed programatically. */ @@ -2803,6 +3145,8 @@ extern int wimlib_print_metadata(WIMStruct *wim, int image) _wimlib_deprecated; /** + * @ingroup G_nonstandalone_wims + * * Reference resources 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 needed resources (that is, "streams" keyed by SHA1 message digest) @@ -2855,6 +3199,8 @@ wimlib_reference_resource_files(WIMStruct *wim, wimlib_progress_func_t progress_func); /** + * @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. * @@ -2887,6 +3233,8 @@ wimlib_reference_resources(WIMStruct *wim, WIMStruct **resource_wims, unsigned num_resource_wims, int ref_flags); /** + * @ingroup G_modifying_wims + * * Declares 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 @@ -2960,6 +3308,8 @@ wimlib_reference_template_image(WIMStruct *wim, int new_image, int flags, wimlib_progress_func_t progress_func); /** + * @ingroup G_wim_information + * * Translates 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. * @@ -2990,6 +3340,8 @@ wimlib_resolve_image(WIMStruct *wim, const wimlib_tchar *image_name_or_num); /** + * @ingroup G_modifying_wims + * * Changes the description of an image in the WIM. * * @param wim @@ -3015,6 +3367,62 @@ wimlib_set_image_descripton(WIMStruct *wim, int image, const wimlib_tchar *description); /** + * @ingroup G_writing_and_overwriting_wims + * + * Set the compression chunk size of a WIM to use in subsequent calls to + * wimlib_write() or wimlib_overwrite(). + * + * A compression chunk size will result in a greater compression ratio, but the + * speed of random access to the WIM will be reduced, and the effect of an + * increased compression chunk size is limited by the size of each file being + * compressed. + * + * WARNING: Changing the compression chunk size to any value other than the + * default of 32768 bytes eliminates compatibility with Microsoft's software, + * except when increasing the XPRESS chunk size before Windows 8. + * + * @param wim + * ::WIMStruct for a WIM. + * @param out_chunk_size + * The chunk size (in bytes) to set. The valid chunk sizes are dependent + * on the compression format. The XPRESS compression format supports chunk + * sizes that are powers of 2 with exponents between 15 and 26 inclusively, + * whereas the LZX compression format supports chunk sizes that are powers + * of 2 with exponents between 15 and 21 inclusively. + * + * @return 0 on success; nonzero on error. + * + * @retval ::WIMLIB_ERR_INVALID_CHUNK_SIZE + * @p ctype is not a supported chunk size. + */ +extern int +wimlib_set_output_chunk_size(WIMStruct *wim, uint32_t chunk_size); + +/** + * @ingroup G_writing_and_overwriting_wims + * + * Set the compression type of a WIM to use in subsequent calls to + * wimlib_write() or wimlib_overwrite(). + * + * @param wim + * ::WIMStruct for a WIM. + * @param ctype + * The compression type to set (one of ::wimlib_compression_type). If this + * compression type is incompatible with the current output chunk size + * (either the default or as set with wimlib_set_output_chunk_size()), the + * output chunk size is reset to the default for that compression type. + * + * @return 0 on success; nonzero on error. + * + * @retval ::WIMLIB_ERR_INVALID_PARAM + * @p ctype did not specify a valid compression type. + */ +extern int +wimlib_set_output_compression_type(WIMStruct *wim, int ctype); + +/** + * @ingroup G_modifying_wims + * * Set basic information about a WIM. * * @param wim @@ -3045,6 +3453,8 @@ wimlib_set_wim_info(WIMStruct *wim, const struct wimlib_wim_info *info, int which); /** + * @ingroup G_modifying_wims + * * Changes what is written in the \ element in the WIM XML data * (something like "Core" or "Ultimate") * @@ -3069,6 +3479,8 @@ extern int wimlib_set_image_flags(WIMStruct *wim, int image, const wimlib_tchar *flags); /** + * @ingroup G_modifying_wims + * * Changes the name of an image in the WIM. * * @param wim @@ -3095,6 +3507,8 @@ extern int wimlib_set_image_name(WIMStruct *wim, int image, const wimlib_tchar *name); /** + * @ingroup G_general + * * Set the functions that wimlib uses to allocate and free memory. * * These settings are global and not per-WIM. @@ -3128,6 +3542,8 @@ wimlib_set_memory_allocator(void *(*malloc_func)(size_t), void *(*realloc_func)(void *, size_t)); /** + * @ingroup G_general + * * Sets whether wimlib is to print error messages to @c stderr when a function * fails. These error messages may provide information that cannot be * determined only from the error code that is returned. Not every error will @@ -3153,6 +3569,8 @@ extern int wimlib_set_print_errors(bool show_messages); /** + * @ingroup G_nonstandalone_wims + * * Splits a WIM into multiple parts. * * @param wim @@ -3197,6 +3615,8 @@ wimlib_split(WIMStruct *wim, wimlib_progress_func_t progress_func); /** + * @ingroup G_mounting_wim_images + * * Unmounts a WIM image that was mounted using wimlib_mount_image(). * * The image to unmount is specified by the path to the mountpoint, not the @@ -3264,6 +3684,8 @@ wimlib_unmount_image(const wimlib_tchar *dir, wimlib_progress_func_t progress_func); /** + * @ingroup G_modifying_wims + * * Update a WIM image by adding, deleting, and/or renaming files or directories. * * @param wim @@ -3375,6 +3797,8 @@ wimlib_update_image(WIMStruct *wim, wimlib_progress_func_t progress_func); /** + * @ingroup G_writing_and_overwriting_wims + * * Writes a WIM to a file. * * This brings in resources from any external locations, such as directory trees @@ -3460,6 +3884,8 @@ wimlib_write(WIMStruct *wim, wimlib_progress_func_t progress_func); /** + * @ingroup G_writing_and_overwriting_wims + * * Since wimlib v1.5.0: 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 @@ -3486,15 +3912,57 @@ wimlib_write_to_fd(WIMStruct *wim, wimlib_progress_func_t progress_func); /** - * This function is equivalent to wimlib_lzx_compress(), but instead compresses - * the data using "XPRESS" compression. + * @ingroup G_compression + * + * Compress a chunk of data using XPRESS compression. + * + * This function is exported for convenience only and should only be used by + * library clients looking to make use of wimlib's compression code for another + * purpose. + * + * As of wimlib v1.5.4, this function can be used with @p chunk_size greater + * than 32768 bytes and is only limited by available memory. However, the + * XPRESS format itself still caps match offsets to 65535, so if a larger chunk + * size is chosen, then the matching will effectively occur in a sliding window + * over it. + * + * @param chunk + * Uncompressed data of the chunk. + * @param chunk_size + * Size of the uncompressed chunk, in bytes. + * @param out + * Pointer to output buffer of size at least (@p chunk_size - 1) bytes. + * + * @return + * The size of the compressed data written to @p out in bytes, or 0 if the + * data could not be compressed to (@p chunk_size - 1) bytes or fewer. */ extern unsigned wimlib_xpress_compress(const void *chunk, unsigned chunk_size, void *out); /** - * This function is equivalent to wimlib_lzx_decompress(), but instead assumes - * the data is compressed using "XPRESS" compression. + * @ingroup G_compression + * + * Decompresses a chunk of XPRESS-compressed data. + * + * This function is exported for convenience only and should only be used by + * library clients looking to make use of wimlib's compression code for another + * purpose. + * + * @param compressed_data + * Pointer to the compressed data. + * + * @param compressed_len + * Length of the compressed data, in bytes. + * + * @param uncompressed_data + * Pointer to the buffer into which to write the uncompressed data. + * + * @param uncompressed_len + * Length of the uncompressed data. + * + * @return + * 0 on success; non-zero on failure. */ extern int wimlib_xpress_decompress(const void *compressed_data, unsigned compressed_len,