X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Fextract.c;h=c04f11b65b1c7d40f6dfc516a3f19fbbd7d19cd4;hb=ebdba490384924ef422b1df675ba11d5030faf09;hp=cfeb48982392c62893f9718c8f3e3a200a8fe6a1;hpb=01c6f902b2a48a33af3f94e29791f85c68df91d0;p=wimlib diff --git a/src/extract.c b/src/extract.c index cfeb4898..83477f13 100644 --- a/src/extract.c +++ b/src/extract.c @@ -6,446 +6,728 @@ */ /* - * Copyright (C) 2012, 2013 Eric Biggers + * Copyright (C) 2012, 2013, 2014, 2015 Eric Biggers * - * This file is part of wimlib, a library for working with WIM files. + * This file is free software; you can redistribute it and/or modify it under + * the terms of the GNU Lesser General Public License as published by the Free + * Software Foundation; either version 3 of the License, or (at your option) any + * later version. * - * wimlib is free software; you can redistribute it and/or modify it under the - * terms of the GNU General Public License as published by the Free - * Software Foundation; either version 3 of the License, or (at your option) - * any later version. - * - * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY - * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR - * A PARTICULAR PURPOSE. See the GNU General Public License for more + * This file is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more * details. * - * You should have received a copy of the GNU General Public License - * along with wimlib; if not, see http://www.gnu.org/licenses/. + * You should have received a copy of the GNU Lesser General Public License + * along with this file; if not, see http://www.gnu.org/licenses/. + */ + +/* + * This file provides the API functions wimlib_extract_image(), + * wimlib_extract_image_from_pipe(), wimlib_extract_paths(), and + * wimlib_extract_pathlist(). Internally, all end up calling + * do_wimlib_extract_paths() and extract_trees(). + * + * Although wimlib supports multiple extraction modes/backends (NTFS-3g, UNIX, + * Win32), this file does not itself have code to extract files or directories + * to any specific target; instead, it handles generic functionality and relies + * on lower-level callback functions declared in `struct apply_operations' to do + * the actual extraction. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif -#ifdef __WIN32__ -# include "wimlib/win32_common.h" /* For GetFullPathName() */ -#endif +#include +#include +#include +#include #include "wimlib/apply.h" +#include "wimlib/assert.h" +#include "wimlib/blob_table.h" #include "wimlib/dentry.h" #include "wimlib/encoding.h" #include "wimlib/endianness.h" #include "wimlib/error.h" -#include "wimlib/lookup_table.h" +#include "wimlib/metadata.h" +#include "wimlib/pathlist.h" #include "wimlib/paths.h" +#include "wimlib/reparse.h" #include "wimlib/resource.h" -#include "wimlib/swm.h" -#ifdef __WIN32__ -# include "wimlib/win32.h" /* for realpath() equivalent */ -#endif +#include "wimlib/security.h" +#include "wimlib/unix_data.h" +#include "wimlib/wildcard.h" +#include "wimlib/wim.h" +#include "wimlib/win32.h" /* for realpath() equivalent */ #include "wimlib/xml.h" -#include -#include -#ifdef WITH_NTFS_3G -# include /* for ntfs_mount(), ntfs_umount() */ -#endif -#include -#include -#include +#define WIMLIB_EXTRACT_FLAG_FROM_PIPE 0x80000000 +#define WIMLIB_EXTRACT_FLAG_IMAGEMODE 0x40000000 + +/* Keep in sync with wimlib.h */ +#define WIMLIB_EXTRACT_MASK_PUBLIC \ + (WIMLIB_EXTRACT_FLAG_NTFS | \ + WIMLIB_EXTRACT_FLAG_UNIX_DATA | \ + WIMLIB_EXTRACT_FLAG_NO_ACLS | \ + WIMLIB_EXTRACT_FLAG_STRICT_ACLS | \ + WIMLIB_EXTRACT_FLAG_RPFIX | \ + WIMLIB_EXTRACT_FLAG_NORPFIX | \ + WIMLIB_EXTRACT_FLAG_TO_STDOUT | \ + WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES | \ + WIMLIB_EXTRACT_FLAG_ALL_CASE_CONFLICTS | \ + WIMLIB_EXTRACT_FLAG_STRICT_TIMESTAMPS | \ + WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES | \ + WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS | \ + WIMLIB_EXTRACT_FLAG_GLOB_PATHS | \ + WIMLIB_EXTRACT_FLAG_STRICT_GLOB | \ + WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES | \ + WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE | \ + WIMLIB_EXTRACT_FLAG_WIMBOOT) + +/* Send WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE or + * WIMLIB_PROGRESS_MSG_EXTRACT_METADATA. */ +int +do_file_extract_progress(struct apply_ctx *ctx, enum wimlib_progress_msg msg) +{ + ctx->count_until_file_progress = 500; /* Arbitrary value to limit calls */ + return extract_progress(ctx, msg); +} + +static int +start_file_phase(struct apply_ctx *ctx, u64 end_file_count, enum wimlib_progress_msg msg) +{ + ctx->progress.extract.current_file_count = 0; + ctx->progress.extract.end_file_count = end_file_count; + return do_file_extract_progress(ctx, msg); +} + +int +start_file_structure_phase(struct apply_ctx *ctx, u64 end_file_count) +{ + return start_file_phase(ctx, end_file_count, WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE); +} -#define MAX_EXTRACT_LONG_PATH_WARNINGS 5 +int +start_file_metadata_phase(struct apply_ctx *ctx, u64 end_file_count) +{ + return start_file_phase(ctx, end_file_count, WIMLIB_PROGRESS_MSG_EXTRACT_METADATA); +} static int -do_apply_op(struct wim_dentry *dentry, struct apply_args *args, - int (*apply_dentry_func)(const tchar *, size_t, - struct wim_dentry *, struct apply_args *)) +end_file_phase(struct apply_ctx *ctx, enum wimlib_progress_msg msg) { - tchar *p; - size_t extraction_path_nchars; - struct wim_dentry *d; - LIST_HEAD(ancestor_list); - const tchar *target; - size_t target_nchars; + ctx->progress.extract.current_file_count = ctx->progress.extract.end_file_count; + return do_file_extract_progress(ctx, msg); +} -#ifdef __WIN32__ - if (args->target_lowlevel_path) { - target = args->target_lowlevel_path; - target_nchars = args->target_lowlevel_path_nchars; - } else -#endif +int +end_file_structure_phase(struct apply_ctx *ctx) +{ + return end_file_phase(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE); +} + +int +end_file_metadata_phase(struct apply_ctx *ctx) +{ + return end_file_phase(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_METADATA); +} + +#define PWM_ALLOW_WIM_HDR 0x00001 + +/* Read the header for a blob in a pipable WIM. */ +static int +read_pwm_blob_header(WIMStruct *pwm, struct blob_descriptor *blob, + struct wim_resource_descriptor *rdesc, + int flags, struct wim_header_disk *hdr_ret) +{ + union { + struct pwm_blob_hdr blob_hdr; + struct wim_header_disk pwm_hdr; + } buf; + struct wim_reshdr reshdr; + int ret; + + ret = full_read(&pwm->in_fd, &buf.blob_hdr, sizeof(buf.blob_hdr)); + if (ret) + goto read_error; + + if ((flags & PWM_ALLOW_WIM_HDR) && + le64_to_cpu(buf.blob_hdr.magic) == PWM_MAGIC) { - target = args->target; - target_nchars = args->target_nchars; - } + BUILD_BUG_ON(sizeof(buf.pwm_hdr) < sizeof(buf.blob_hdr)); + ret = full_read(&pwm->in_fd, &buf.blob_hdr + 1, + sizeof(buf.pwm_hdr) - sizeof(buf.blob_hdr)); - extraction_path_nchars = target_nchars; + if (ret) + goto read_error; + blob->blob_location = BLOB_NONEXISTENT; + memcpy(hdr_ret, &buf.pwm_hdr, sizeof(buf.pwm_hdr)); + return 0; + } - for (d = dentry; d != args->extract_root; d = d->parent) { - if (d->not_extracted) - return 0; - extraction_path_nchars += d->extraction_name_nchars + 1; - list_add(&d->tmp_list, &ancestor_list); + if (le64_to_cpu(buf.blob_hdr.magic) != PWM_BLOB_MAGIC) { + ERROR("Data read on pipe is invalid (expected blob header)."); + return WIMLIB_ERR_INVALID_PIPABLE_WIM; } - tchar extraction_path[extraction_path_nchars + 1]; - p = tmempcpy(extraction_path, target, target_nchars); + copy_hash(blob->hash, buf.blob_hdr.hash); + reshdr.size_in_wim = 0; + reshdr.flags = le32_to_cpu(buf.blob_hdr.flags); + reshdr.offset_in_wim = pwm->in_fd.offset; + reshdr.uncompressed_size = le64_to_cpu(buf.blob_hdr.uncompressed_size); + wim_res_hdr_to_desc(&reshdr, pwm, rdesc); + blob_set_is_located_in_nonsolid_wim_resource(blob, rdesc); + blob->is_metadata = (rdesc->flags & WIM_RESHDR_FLAG_METADATA) != 0; - list_for_each_entry(d, &ancestor_list, tmp_list) { - *p++ = OS_PREFERRED_PATH_SEPARATOR; - p = tmempcpy(p, d->extraction_name, d->extraction_name_nchars); - } - *p = T('\0'); + if (unlikely(blob->size == 0)) + return WIMLIB_ERR_INVALID_PIPABLE_WIM; -#ifdef __WIN32__ - /* Warn the user if the path exceeds MAX_PATH */ + return 0; + +read_error: + ERROR_WITH_ERRNO("Error reading pipable WIM from pipe"); + return ret; +} + +static int +read_blobs_from_pipe(struct apply_ctx *ctx, + const struct read_blob_list_callbacks *cbs) +{ + struct blob_descriptor *found_blob = NULL; + struct wim_resource_descriptor *rdesc = NULL; + struct blob_table *blob_table; + int ret; + + ret = WIMLIB_ERR_NOMEM; + found_blob = new_blob_descriptor(); + if (!found_blob) + goto out; + + rdesc = MALLOC(sizeof(struct wim_resource_descriptor)); + if (!rdesc) + goto out; + + blob_table = ctx->wim->blob_table; + memcpy(ctx->progress.extract.guid, ctx->wim->hdr.guid, WIM_GUID_LEN); + ctx->progress.extract.part_number = ctx->wim->hdr.part_number; + ctx->progress.extract.total_parts = ctx->wim->hdr.total_parts; + ret = extract_progress(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN); + if (ret) + goto out; + + while (ctx->num_blobs_remaining) { + struct wim_header_disk pwm_hdr; + struct blob_descriptor *needed_blob; + + if (found_blob->blob_location != BLOB_NONEXISTENT) + blob_unset_is_located_in_wim_resource(found_blob); + ret = read_pwm_blob_header(ctx->wim, found_blob, rdesc, + PWM_ALLOW_WIM_HDR, &pwm_hdr); + if (ret) + goto out; - /* + 1 for '\0', -4 for \\?\. */ - if (extraction_path_nchars + 1 - 4 > MAX_PATH) { - if (dentry->needs_extraction && - args->num_long_paths < MAX_EXTRACT_LONG_PATH_WARNINGS) + if ((found_blob->blob_location != BLOB_NONEXISTENT) + && !found_blob->is_metadata + && (needed_blob = lookup_blob(blob_table, found_blob->hash)) + && (needed_blob->out_refcnt)) { - WARNING("Path \"%ls\" exceeds MAX_PATH and will not be accessible " - "to most Windows software", extraction_path); - if (++args->num_long_paths == MAX_EXTRACT_LONG_PATH_WARNINGS) - WARNING("Suppressing further warnings about long paths"); + blob_unset_is_located_in_wim_resource(found_blob); + blob_set_is_located_in_nonsolid_wim_resource(needed_blob, rdesc); + + ret = (*cbs->begin_blob)(needed_blob, + cbs->begin_blob_ctx); + if (ret) { + blob_unset_is_located_in_wim_resource(needed_blob); + goto out; + } + + ret = extract_blob(needed_blob, needed_blob->size, + cbs->consume_chunk, + cbs->consume_chunk_ctx); + + ret = (*cbs->end_blob)(needed_blob, ret, + cbs->end_blob_ctx); + blob_unset_is_located_in_wim_resource(needed_blob); + if (ret) + goto out; + ctx->num_blobs_remaining--; + } else if (found_blob->blob_location != BLOB_NONEXISTENT) { + ret = skip_wim_resource(found_blob->rdesc); + if (ret) + goto out; + } else { + u16 part_number = le16_to_cpu(pwm_hdr.part_number); + u16 total_parts = le16_to_cpu(pwm_hdr.total_parts); + + if (part_number != ctx->progress.extract.part_number || + total_parts != ctx->progress.extract.total_parts || + memcmp(pwm_hdr.guid, ctx->progress.extract.guid, + WIM_GUID_LEN)) + { + ctx->progress.extract.part_number = part_number; + ctx->progress.extract.total_parts = total_parts; + memcpy(ctx->progress.extract.guid, + pwm_hdr.guid, WIM_GUID_LEN); + ret = extract_progress(ctx, + WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN); + if (ret) + goto out; + } } } -#endif - return (*apply_dentry_func)(extraction_path, extraction_path_nchars, - dentry, args); + ret = 0; +out: + if (found_blob && found_blob->blob_location != BLOB_IN_WIM) + FREE(rdesc); + free_blob_descriptor(found_blob); + return ret; } - -/* Extracts a file, directory, or symbolic link from the WIM archive. */ +/* Creates a temporary file opened for writing. The open file descriptor is + * returned in @fd_ret and its name is returned in @name_ret (dynamically + * allocated). */ static int -apply_dentry_normal(struct wim_dentry *dentry, void *arg) +create_temporary_file(struct filedes *fd_ret, tchar **name_ret) { + tchar *name; + int open_flags; + int raw_fd; + +retry: + name = ttempnam(NULL, T("wimlib")); + if (!name) { + ERROR_WITH_ERRNO("Failed to create temporary filename"); + return WIMLIB_ERR_NOMEM; + } + + open_flags = O_WRONLY | O_CREAT | O_EXCL | O_BINARY; #ifdef __WIN32__ - return do_apply_op(dentry, arg, win32_do_apply_dentry); -#else - return do_apply_op(dentry, arg, unix_do_apply_dentry); + open_flags |= _O_SHORT_LIVED; #endif -} + raw_fd = topen(name, open_flags, 0600); + + if (raw_fd < 0) { + if (errno == EEXIST) { + FREE(name); + goto retry; + } + ERROR_WITH_ERRNO("Failed to create temporary file " + "\"%"TS"\"", name); + FREE(name); + return WIMLIB_ERR_OPEN; + } + filedes_init(fd_ret, raw_fd); + *name_ret = name; + return 0; +} -/* Apply timestamps to an extracted file or directory */ static int -apply_dentry_timestamps_normal(struct wim_dentry *dentry, void *arg) +begin_extract_blob_wrapper(struct blob_descriptor *blob, void *_ctx) { -#ifdef __WIN32__ - return do_apply_op(dentry, arg, win32_do_apply_dentry_timestamps); -#else - return do_apply_op(dentry, arg, unix_do_apply_dentry_timestamps); -#endif + struct apply_ctx *ctx = _ctx; + + ctx->cur_blob = blob; + ctx->cur_blob_offset = 0; + + if (unlikely(blob->out_refcnt > MAX_OPEN_FILES)) + return create_temporary_file(&ctx->tmpfile_fd, &ctx->tmpfile_name); + else + return (*ctx->saved_cbs->begin_blob)(blob, ctx->saved_cbs->begin_blob_ctx); } -static bool -dentry_is_dot_or_dotdot(const struct wim_dentry *dentry) +static int +extract_chunk_wrapper(const void *chunk, size_t size, void *_ctx) { - const utf16lechar *file_name = dentry->file_name; - return file_name != NULL && - file_name[0] == cpu_to_le16('.') && - (file_name[1] == cpu_to_le16('\0') || - (file_name[1] == cpu_to_le16('.') && - file_name[2] == cpu_to_le16('\0'))); + struct apply_ctx *ctx = _ctx; + union wimlib_progress_info *progress = &ctx->progress; + int ret; + + ctx->cur_blob_offset += size; + + if (likely(ctx->supported_features.hard_links)) { + progress->extract.completed_bytes += + (u64)size * ctx->cur_blob->out_refcnt; + if (ctx->cur_blob_offset == ctx->cur_blob->size) + progress->extract.completed_streams += ctx->cur_blob->out_refcnt; + } else { + const struct blob_extraction_target *targets = + blob_extraction_targets(ctx->cur_blob); + for (u32 i = 0; i < ctx->cur_blob->out_refcnt; i++) { + const struct wim_inode *inode = targets[i].inode; + const struct wim_dentry *dentry; + + list_for_each_entry(dentry, + &inode->i_extraction_aliases, + d_extraction_alias_node) + { + progress->extract.completed_bytes += size; + if (ctx->cur_blob_offset == ctx->cur_blob->size) + progress->extract.completed_streams++; + } + } + } + if (progress->extract.completed_bytes >= ctx->next_progress) { + + ret = extract_progress(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS); + if (ret) + return ret; + + if (progress->extract.completed_bytes >= + progress->extract.total_bytes) + { + ctx->next_progress = UINT64_MAX; + } else { + /* Send new message as soon as another 1/128 of the + * total has been extracted. (Arbitrary number.) */ + ctx->next_progress = + progress->extract.completed_bytes + + progress->extract.total_bytes / 128; + + /* ... Unless that would be more than 5000000 bytes, in + * which case send the next after the next 5000000 + * bytes. (Another arbitrary number.) */ + if (progress->extract.completed_bytes + 5000000 < + ctx->next_progress) + ctx->next_progress = + progress->extract.completed_bytes + 5000000; + + /* ... But always send a message as soon as we're + * completely done. */ + if (progress->extract.total_bytes < ctx->next_progress) + ctx->next_progress = progress->extract.total_bytes; + } + } + + if (unlikely(filedes_valid(&ctx->tmpfile_fd))) { + /* Just extracting to temporary file for now. */ + ret = full_write(&ctx->tmpfile_fd, chunk, size); + if (ret) { + ERROR_WITH_ERRNO("Error writing data to " + "temporary file \"%"TS"\"", + ctx->tmpfile_name); + } + return ret; + } else { + return (*ctx->saved_cbs->consume_chunk)(chunk, size, + ctx->saved_cbs->consume_chunk_ctx); + } } -/* Extract a dentry if it hasn't already been extracted and either - * WIMLIB_EXTRACT_FLAG_NO_STREAMS is not specified, or the dentry is a directory - * and/or has no unnamed stream. */ static int -maybe_apply_dentry(struct wim_dentry *dentry, void *arg) +extract_from_tmpfile(const tchar *tmpfile_name, struct apply_ctx *ctx) { - struct apply_args *args = arg; + struct blob_descriptor tmpfile_blob; + struct blob_descriptor *orig_blob = ctx->cur_blob; + const struct read_blob_list_callbacks *cbs = ctx->saved_cbs; int ret; + const u32 orig_refcnt = orig_blob->out_refcnt; - if (!dentry->needs_extraction) - return 0; + BUILD_BUG_ON(MAX_OPEN_FILES < + ARRAY_LEN(orig_blob->inline_blob_extraction_targets)); - if (args->extract_flags & WIMLIB_EXTRACT_FLAG_NO_STREAMS && - !dentry_is_directory(dentry) && - inode_unnamed_lte_resolved(dentry->d_inode) != NULL) - return 0; + struct blob_extraction_target *targets = orig_blob->blob_extraction_targets; - if ((args->extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE) && - args->progress_func) { - ret = calculate_dentry_full_path(dentry); + /* Copy the blob's data from the temporary file to each of its targets. + * + * This is executed only in the very uncommon case that a blob is being + * extracted to more than MAX_OPEN_FILES targets! */ + + memcpy(&tmpfile_blob, orig_blob, sizeof(struct blob_descriptor)); + tmpfile_blob.blob_location = BLOB_IN_FILE_ON_DISK; + tmpfile_blob.file_on_disk = ctx->tmpfile_name; + ret = 0; + for (u32 i = 0; i < orig_refcnt; i++) { + + /* Note: it usually doesn't matter whether we pass the original + * blob descriptor to callbacks provided by the extraction + * backend as opposed to the tmpfile blob descriptor, since they + * shouldn't actually read data from the blob other than through + * the read_blob_prefix() call below. But for + * WIMLIB_EXTRACT_FLAG_WIMBOOT mode on Windows it does matter + * because it needs access to the original WIM resource + * descriptor in order to create the external backing reference. + */ + + orig_blob->out_refcnt = 1; + orig_blob->inline_blob_extraction_targets[0] = targets[i]; + + ret = (*cbs->begin_blob)(orig_blob, cbs->begin_blob_ctx); if (ret) - return ret; - args->progress.extract.cur_path = dentry->_full_path; - args->progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DENTRY, - &args->progress); + break; + + /* Extra SHA-1 isn't necessary here, but it shouldn't hurt as + * this case is very rare anyway. */ + ret = extract_blob(&tmpfile_blob, tmpfile_blob.size, + cbs->consume_chunk, + cbs->consume_chunk_ctx); + + ret = (*cbs->end_blob)(orig_blob, ret, cbs->end_blob_ctx); + if (ret) + break; } - ret = args->apply_dentry(dentry, args); - if (ret == 0) - dentry->needs_extraction = 0; + FREE(targets); + orig_blob->out_refcnt = 0; return ret; } -static void -calculate_bytes_to_extract(struct list_head *stream_list, - int extract_flags, - union wimlib_progress_info *progress) +static int +end_extract_blob_wrapper(struct blob_descriptor *blob, int status, void *_ctx) { - struct wim_lookup_table_entry *lte; - u64 total_bytes = 0; - u64 num_streams = 0; - - /* For each stream to be extracted... */ - list_for_each_entry(lte, stream_list, extraction_list) { - if (extract_flags & - (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK)) - { - /* In the symlink or hard link extraction mode, each - * stream will be extracted one time regardless of how - * many dentries share the stream. */ - wimlib_assert(!(extract_flags & WIMLIB_EXTRACT_FLAG_NTFS)); - if (!lte->extracted_file) { - num_streams++; - total_bytes += wim_resource_size(lte); - } - } else { - num_streams += lte->out_refcnt; - total_bytes += lte->out_refcnt * wim_resource_size(lte); - } + struct apply_ctx *ctx = _ctx; + + if (unlikely(filedes_valid(&ctx->tmpfile_fd))) { + filedes_close(&ctx->tmpfile_fd); + if (!status) + status = extract_from_tmpfile(ctx->tmpfile_name, ctx); + filedes_invalidate(&ctx->tmpfile_fd); + tunlink(ctx->tmpfile_name); + FREE(ctx->tmpfile_name); + return status; + } else { + return (*ctx->saved_cbs->end_blob)(blob, status, + ctx->saved_cbs->end_blob_ctx); } - progress->extract.num_streams = num_streams; - progress->extract.total_bytes = total_bytes; - progress->extract.completed_bytes = 0; } -static void -maybe_add_stream_for_extraction(struct wim_lookup_table_entry *lte, - struct list_head *stream_list) +/* + * Read the list of blobs to extract and feed their data into the specified + * callback functions. + * + * This handles checksumming each blob. + * + * This also handles sending WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS. + * + * This also works if the WIM is being read from a pipe, whereas attempting to + * read blobs directly (e.g. with read_full_blob_into_buf()) will not. + * + * This also will split up blobs that will need to be extracted to more than + * MAX_OPEN_FILES locations, as measured by the 'out_refcnt' of each blob. + * Therefore, the apply_operations implementation need not worry about running + * out of file descriptors, unless it might open more than one file descriptor + * per 'blob_extraction_target' (e.g. Win32 currently might because the + * destination file system might not support hard links). + */ +int +extract_blob_list(struct apply_ctx *ctx, + const struct read_blob_list_callbacks *cbs) { - if (++lte->out_refcnt == 1) { - INIT_LIST_HEAD(<e->lte_dentry_list); - list_add_tail(<e->extraction_list, stream_list); + struct read_blob_list_callbacks wrapper_cbs = { + .begin_blob = begin_extract_blob_wrapper, + .begin_blob_ctx = ctx, + .consume_chunk = extract_chunk_wrapper, + .consume_chunk_ctx = ctx, + .end_blob = end_extract_blob_wrapper, + .end_blob_ctx = ctx, + }; + ctx->saved_cbs = cbs; + if (ctx->extract_flags & WIMLIB_EXTRACT_FLAG_FROM_PIPE) { + return read_blobs_from_pipe(ctx, &wrapper_cbs); + } else { + return read_blob_list(&ctx->blob_list, + offsetof(struct blob_descriptor, + extraction_list), + &wrapper_cbs, VERIFY_BLOB_HASHES); } } -struct find_streams_ctx { - struct list_head stream_list; - int extract_flags; -}; - +/* Extract a WIM dentry to standard output. + * + * This obviously doesn't make sense in all cases. We return an error if the + * dentry does not correspond to a regular file. Otherwise we extract the + * unnamed data stream only. */ static int -dentry_find_streams_to_extract(struct wim_dentry *dentry, void *_ctx) +extract_dentry_to_stdout(struct wim_dentry *dentry, + const struct blob_table *blob_table) { - struct find_streams_ctx *ctx = _ctx; struct wim_inode *inode = dentry->d_inode; - struct wim_lookup_table_entry *lte; - bool dentry_added = false; - struct list_head *stream_list = &ctx->stream_list; - int extract_flags = ctx->extract_flags; - - if (!dentry->needs_extraction) - return 0; + struct blob_descriptor *blob; + struct filedes _stdout; - lte = inode_unnamed_lte_resolved(inode); - if (lte) { - if (!inode->i_visited) - maybe_add_stream_for_extraction(lte, stream_list); - list_add_tail(&dentry->extraction_stream_list, <e->lte_dentry_list); - dentry_added = true; + if (inode->i_attributes & (FILE_ATTRIBUTE_REPARSE_POINT | + FILE_ATTRIBUTE_DIRECTORY | + FILE_ATTRIBUTE_ENCRYPTED)) + { + ERROR("\"%"TS"\" is not a regular file and therefore cannot be " + "extracted to standard output", dentry_full_path(dentry)); + return WIMLIB_ERR_NOT_A_REGULAR_FILE; } - /* Determine whether to include alternate data stream entries or not. - * - * UNIX: Include them if extracting using NTFS-3g. - * - * Windows: Include them undconditionally, although if the filesystem is - * not NTFS we won't actually be able to extract them. */ -#if defined(WITH_NTFS_3G) - if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) -#elif defined(__WIN32__) - if (1) -#else - if (0) -#endif - { - for (unsigned i = 0; i < inode->i_num_ads; i++) { - if (inode->i_ads_entries[i].stream_name_nbytes != 0) { - lte = inode->i_ads_entries[i].lte; - if (lte) { - if (!inode->i_visited) { - maybe_add_stream_for_extraction(lte, - stream_list); - } - if (!dentry_added) { - list_add_tail(&dentry->extraction_stream_list, - <e->lte_dentry_list); - dentry_added = true; - } - } - } - } + blob = inode_get_blob_for_unnamed_data_stream(inode, blob_table); + if (!blob) { + const u8 *hash = inode_get_hash_of_unnamed_data_stream(inode); + if (!is_zero_hash(hash)) + return blob_not_found_error(inode, hash); + return 0; } - inode->i_visited = 1; - return 0; + + filedes_init(&_stdout, STDOUT_FILENO); + return extract_full_blob_to_fd(blob, &_stdout); } static int -dentry_resolve_and_zero_lte_refcnt(struct wim_dentry *dentry, void *_lookup_table) +extract_dentries_to_stdout(struct wim_dentry **dentries, size_t num_dentries, + const struct blob_table *blob_table) { - struct wim_inode *inode = dentry->d_inode; - struct wim_lookup_table *lookup_table = _lookup_table; - struct wim_lookup_table_entry *lte; - - inode_resolve_ltes(inode, lookup_table); - for (unsigned i = 0; i <= inode->i_num_ads; i++) { - lte = inode_stream_lte_resolved(inode, i); - if (lte) - lte->out_refcnt = 0; + for (size_t i = 0; i < num_dentries; i++) { + int ret = extract_dentry_to_stdout(dentries[i], blob_table); + if (ret) + return ret; } return 0; } -static void -find_streams_for_extraction(struct wim_dentry *root, - struct list_head *stream_list, - struct wim_lookup_table *lookup_table, - int extract_flags) -{ - struct find_streams_ctx ctx; +/**********************************************************************/ - INIT_LIST_HEAD(&ctx.stream_list); - ctx.extract_flags = extract_flags; - for_dentry_in_tree(root, dentry_resolve_and_zero_lte_refcnt, lookup_table); - for_dentry_in_tree(root, dentry_find_streams_to_extract, &ctx); - list_transfer(&ctx.stream_list, stream_list); +/* + * Removes duplicate dentries from the array. + * + * Returns the new number of dentries, packed at the front of the array. + */ +static size_t +remove_duplicate_trees(struct wim_dentry **trees, size_t num_trees) +{ + size_t i, j = 0; + for (i = 0; i < num_trees; i++) { + if (!trees[i]->tmp_flag) { + /* Found distinct dentry. */ + trees[i]->tmp_flag = 1; + trees[j++] = trees[i]; + } + } + for (i = 0; i < j; i++) + trees[i]->tmp_flag = 0; + return j; } -struct apply_operations { - int (*apply_dentry)(struct wim_dentry *dentry, void *arg); - int (*apply_dentry_timestamps)(struct wim_dentry *dentry, void *arg); -}; +/* + * Remove dentries that are descendants of other dentries in the array. + * + * Returns the new number of dentries, packed at the front of the array. + */ +static size_t +remove_contained_trees(struct wim_dentry **trees, size_t num_trees) +{ + size_t i, j = 0; + for (i = 0; i < num_trees; i++) + trees[i]->tmp_flag = 1; + for (i = 0; i < num_trees; i++) { + struct wim_dentry *d = trees[i]; + while (!dentry_is_root(d)) { + d = d->d_parent; + if (d->tmp_flag) + goto tree_contained; + } + trees[j++] = trees[i]; + continue; -static const struct apply_operations normal_apply_operations = { - .apply_dentry = apply_dentry_normal, - .apply_dentry_timestamps = apply_dentry_timestamps_normal, -}; + tree_contained: + trees[i]->tmp_flag = 0; + } -#ifdef WITH_NTFS_3G -static const struct apply_operations ntfs_apply_operations = { - .apply_dentry = apply_dentry_ntfs, - .apply_dentry_timestamps = apply_dentry_timestamps_ntfs, -}; -#endif + for (i = 0; i < j; i++) + trees[i]->tmp_flag = 0; + return j; +} static int -apply_stream_list(struct list_head *stream_list, - struct apply_args *args, - const struct apply_operations *ops, - wimlib_progress_func_t progress_func) +dentry_append_to_list(struct wim_dentry *dentry, void *_dentry_list) { - uint64_t bytes_per_progress = args->progress.extract.total_bytes / 100; - uint64_t next_progress = bytes_per_progress; - struct wim_lookup_table_entry *lte; - struct wim_dentry *dentry; - int ret; - - /* This complicated loop is essentially looping through the dentries, - * although dentries may be visited more than once (if a dentry contains - * two different nonempty streams) or not at all (if a dentry contains - * no non-empty streams). - * - * The outer loop is over the distinct streams to be extracted so that - * sequential reading of the WIM can be implemented. */ - - /* For each distinct stream to be extracted */ - list_for_each_entry(lte, stream_list, extraction_list) { - /* For each dentry to be extracted that is a name for an inode - * containing the stream */ - list_for_each_entry(dentry, <e->lte_dentry_list, extraction_stream_list) { - /* Extract the dentry if it was not already - * extracted */ - ret = maybe_apply_dentry(dentry, args); - if (ret) - return ret; - if (progress_func && - args->progress.extract.completed_bytes >= next_progress) - { - progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS, - &args->progress); - if (args->progress.extract.completed_bytes >= - args->progress.extract.total_bytes) - { - next_progress = ~0ULL; - } else { - next_progress = - min (args->progress.extract.completed_bytes + - bytes_per_progress, - args->progress.extract.total_bytes); - } - } - } - } + struct list_head *dentry_list = _dentry_list; + list_add_tail(&dentry->d_extraction_list_node, dentry_list); return 0; } -static int -sort_stream_list_by_wim_position(struct list_head *stream_list) +static void +dentry_reset_extraction_list_node(struct wim_dentry *dentry) { - struct list_head *cur; - size_t num_streams; - struct wim_lookup_table_entry **array; - size_t i; - size_t array_size; - - num_streams = 0; - list_for_each(cur, stream_list) - num_streams++; - array_size = num_streams * sizeof(array[0]); - array = MALLOC(array_size); - if (!array) { - ERROR("Failed to allocate %zu bytes to sort stream entries", - array_size); - return WIMLIB_ERR_NOMEM; - } - cur = stream_list->next; - for (i = 0; i < num_streams; i++) { - array[i] = container_of(cur, struct wim_lookup_table_entry, extraction_list); - cur = cur->next; - } - - qsort(array, num_streams, sizeof(array[0]), cmp_streams_by_wim_position); + dentry->d_extraction_list_node = (struct list_head){NULL, NULL}; +} - INIT_LIST_HEAD(stream_list); - for (i = 0; i < num_streams; i++) - list_add_tail(&array[i]->extraction_list, stream_list); - FREE(array); +static int +dentry_delete_from_list(struct wim_dentry *dentry, void *_ignore) +{ + list_del(&dentry->d_extraction_list_node); + dentry_reset_extraction_list_node(dentry); return 0; } /* - * Extract a dentry to standard output. + * Build the preliminary list of dentries to be extracted. * - * This obviously doesn't make sense in all cases. We return an error if the - * dentry does not correspond to a regular file. Otherwise we extract the - * unnamed data stream only. + * The list maintains the invariant that if d1 and d2 are in the list and d1 is + * an ancestor of d2, then d1 appears before d2 in the list. */ -static int -extract_dentry_to_stdout(struct wim_dentry *dentry) +static void +build_dentry_list(struct list_head *dentry_list, struct wim_dentry **trees, + size_t num_trees, bool add_ancestors) { - int ret = 0; - if (!dentry_is_regular_file(dentry)) { - ERROR("\"%"TS"\" is not a regular file and therefore cannot be " - "extracted to standard output", dentry->_full_path); - ret = WIMLIB_ERR_NOT_A_REGULAR_FILE; - } else { - struct wim_lookup_table_entry *lte; - - lte = inode_unnamed_lte_resolved(dentry->d_inode); - if (lte) { - ret = extract_wim_resource_to_fd(lte, STDOUT_FILENO, - wim_resource_size(lte)); + INIT_LIST_HEAD(dentry_list); + + /* Add the trees recursively. */ + for (size_t i = 0; i < num_trees; i++) + for_dentry_in_tree(trees[i], dentry_append_to_list, dentry_list); + + /* If requested, add ancestors of the trees. */ + if (add_ancestors) { + for (size_t i = 0; i < num_trees; i++) { + struct wim_dentry *dentry = trees[i]; + struct wim_dentry *ancestor; + struct list_head *place_after; + + if (dentry_is_root(dentry)) + continue; + + place_after = dentry_list; + ancestor = dentry; + do { + ancestor = ancestor->d_parent; + if (will_extract_dentry(ancestor)) { + place_after = &ancestor->d_extraction_list_node; + break; + } + } while (!dentry_is_root(ancestor)); + + ancestor = dentry; + do { + ancestor = ancestor->d_parent; + if (will_extract_dentry(ancestor)) + break; + list_add(&ancestor->d_extraction_list_node, place_after); + } while (!dentry_is_root(ancestor)); } } - return ret; +} + +static void +destroy_dentry_list(struct list_head *dentry_list) +{ + struct wim_dentry *dentry, *tmp; + struct wim_inode *inode; + + list_for_each_entry_safe(dentry, tmp, dentry_list, d_extraction_list_node) { + inode = dentry->d_inode; + dentry_reset_extraction_list_node(dentry); + inode->i_visited = 0; + inode->i_can_externally_back = 0; + if ((void *)dentry->d_extraction_name != (void *)dentry->file_name) + FREE(dentry->d_extraction_name); + dentry->d_extraction_name = NULL; + dentry->d_extraction_name_nchars = 0; + } +} + +static void +destroy_blob_list(struct list_head *blob_list) +{ + struct blob_descriptor *blob; + + list_for_each_entry(blob, blob_list, extraction_list) + if (blob->out_refcnt > ARRAY_LEN(blob->inline_blob_extraction_targets)) + FREE(blob->blob_extraction_targets); } #ifdef __WIN32__ @@ -495,80 +777,60 @@ file_name_valid(utf16lechar *name, size_t num_chars, bool fix) return true; } -/* - * dentry_calculate_extraction_path- - * - * Calculate the actual filename component at which a WIM dentry will be - * extracted, handling invalid filenames "properly". - * - * dentry->extraction_name usually will be set the same as dentry->file_name (on - * UNIX, converted into the platform's multibyte encoding). However, if the - * file name contains characters that are not valid on the current platform or - * has some other format that is not valid, leave dentry->extraction_name as - * NULL and clear dentry->needs_extraction to indicate that this dentry should - * not be extracted, unless the appropriate flag - * WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES is set in the extract flags, in - * which case a substitute filename will be created and set instead. - * - * Conflicts with case-insensitive names on Windows are handled similarly; see - * below. - */ static int -dentry_calculate_extraction_path(struct wim_dentry *dentry, void *_args) +dentry_calculate_extraction_name(struct wim_dentry *dentry, + struct apply_ctx *ctx) { - struct apply_args *args = _args; int ret; - dentry->needs_extraction = 1; - - if (dentry == args->extract_root) + if (dentry_is_root(dentry)) return 0; - if (dentry_is_dot_or_dotdot(dentry)) { - /* WIM files shouldn't contain . or .. entries. But if they are - * there, don't attempt to extract them. */ - WARNING("Skipping extraction of unexpected . or .. file \"%"TS"\"", - dentry_full_path(dentry)); - goto skip_dentry; +#ifdef WITH_NTFS_3G + if (ctx->extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { + dentry->d_extraction_name = dentry->file_name; + dentry->d_extraction_name_nchars = dentry->file_name_nbytes / + sizeof(utf16lechar); + return 0; } +#endif -#ifdef __WIN32__ - struct wim_dentry *other; - list_for_each_entry(other, &dentry->case_insensitive_conflict_list, - case_insensitive_conflict_list) - { - if (other->needs_extraction) { - if (args->extract_flags & WIMLIB_EXTRACT_FLAG_ALL_CASE_CONFLICTS) - { - WARNING("\"%"TS"\" has the same case-insensitive " - "name as \"%"TS"\"; extracting dummy name instead", - dentry_full_path(dentry), - dentry_full_path(other)); - goto out_replace; - } else { - WARNING("Not extracting \"%"TS"\": has same case-insensitive " - "name as \"%"TS"\"", - dentry_full_path(dentry), - dentry_full_path(other)); - goto skip_dentry; + if (!ctx->supported_features.case_sensitive_filenames) { + struct wim_dentry *other; + list_for_each_entry(other, &dentry->d_ci_conflict_list, + d_ci_conflict_list) + { + if (will_extract_dentry(other)) { + if (ctx->extract_flags & + WIMLIB_EXTRACT_FLAG_ALL_CASE_CONFLICTS) { + WARNING("\"%"TS"\" has the same " + "case-insensitive name as " + "\"%"TS"\"; extracting " + "dummy name instead", + dentry_full_path(dentry), + dentry_full_path(other)); + goto out_replace; + } else { + WARNING("Not extracting \"%"TS"\": " + "has same case-insensitive " + "name as \"%"TS"\"", + dentry_full_path(dentry), + dentry_full_path(other)); + goto skip_dentry; + } } } } -#endif if (file_name_valid(dentry->file_name, dentry->file_name_nbytes / 2, false)) { -#ifdef __WIN32__ - dentry->extraction_name = dentry->file_name; - dentry->extraction_name_nchars = dentry->file_name_nbytes / 2; - return 0; -#else - return utf16le_to_tstr(dentry->file_name, + ret = utf16le_get_tstr(dentry->file_name, dentry->file_name_nbytes, - &dentry->extraction_name, - &dentry->extraction_name_nchars); -#endif + (const tchar **)&dentry->d_extraction_name, + &dentry->d_extraction_name_nchars); + dentry->d_extraction_name_nchars /= sizeof(tchar); + return ret; } else { - if (args->extract_flags & WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES) + if (ctx->extract_flags & WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES) { WARNING("\"%"TS"\" has an invalid filename " "that is not supported on this platform; " @@ -590,536 +852,902 @@ out_replace: memcpy(utf16_name_copy, dentry->file_name, dentry->file_name_nbytes); file_name_valid(utf16_name_copy, dentry->file_name_nbytes / 2, true); - tchar *tchar_name; + const tchar *tchar_name; size_t tchar_nchars; - #ifdef __WIN32__ - tchar_name = utf16_name_copy; - tchar_nchars = dentry->file_name_nbytes / 2; - #else - ret = utf16le_to_tstr(utf16_name_copy, - dentry->file_name_nbytes, - &tchar_name, &tchar_nchars); + + ret = utf16le_get_tstr(utf16_name_copy, + dentry->file_name_nbytes, + &tchar_name, &tchar_nchars); if (ret) return ret; - #endif - size_t fixed_name_num_chars = tchar_nchars; + + tchar_nchars /= sizeof(tchar); + + size_t fixed_name_num_chars = tchar_nchars; tchar fixed_name[tchar_nchars + 50]; tmemcpy(fixed_name, tchar_name, tchar_nchars); fixed_name_num_chars += tsprintf(fixed_name + tchar_nchars, T(" (invalid filename #%lu)"), - ++args->invalid_sequence); - #ifndef __WIN32__ - FREE(tchar_name); - #endif - dentry->extraction_name = memdup(fixed_name, 2 * fixed_name_num_chars + 2); - if (!dentry->extraction_name) + ++ctx->invalid_sequence); + + utf16le_put_tstr(tchar_name); + + dentry->d_extraction_name = TSTRDUP(fixed_name); + if (!dentry->d_extraction_name) return WIMLIB_ERR_NOMEM; - dentry->extraction_name_nchars = fixed_name_num_chars; + dentry->d_extraction_name_nchars = fixed_name_num_chars; } return 0; + skip_dentry: - dentry->needs_extraction = 0; - dentry->not_extracted = 1; + for_dentry_in_tree(dentry, dentry_delete_from_list, NULL); return 0; } +/* + * Calculate the actual filename component at which each WIM dentry will be + * extracted, with special handling for dentries that are unsupported by the + * extraction backend or have invalid names. + * + * ctx->supported_features must be filled in. + * + * Possible error codes: WIMLIB_ERR_NOMEM, WIMLIB_ERR_INVALID_UTF16_STRING + */ static int -dentry_reset_needs_extraction(struct wim_dentry *dentry, void *_ignore) +dentry_list_calculate_extraction_names(struct list_head *dentry_list, + struct apply_ctx *ctx) { - dentry->needs_extraction = 0; - dentry->not_extracted = 0; - dentry->is_win32_name = 0; - dentry->d_inode->i_visited = 0; - dentry->d_inode->i_dos_name_extracted = 0; - FREE(dentry->d_inode->i_extracted_file); - dentry->d_inode->i_extracted_file = NULL; - if ((void*)dentry->extraction_name != (void*)dentry->file_name) - FREE(dentry->extraction_name); - dentry->extraction_name = NULL; + struct list_head *prev, *cur; + + /* Can't use list_for_each_entry() because a call to + * dentry_calculate_extraction_name() may delete the current dentry and + * its children from the list. */ + + prev = dentry_list; + for (;;) { + struct wim_dentry *dentry; + int ret; + + cur = prev->next; + if (cur == dentry_list) + break; + + dentry = list_entry(cur, struct wim_dentry, d_extraction_list_node); + + ret = dentry_calculate_extraction_name(dentry, ctx); + if (ret) + return ret; + + if (prev->next == cur) + prev = cur; + else + ; /* Current dentry and its children (which follow in + the list) were deleted. prev stays the same. */ + } return 0; } -#define WINDOWS_NT_MAX_PATH 32768 +static int +dentry_resolve_streams(struct wim_dentry *dentry, int extract_flags, + struct blob_table *blob_table) +{ + struct wim_inode *inode = dentry->d_inode; + struct blob_descriptor *blob; + int ret; + bool force = false; + + /* Special case: when extracting from a pipe, the WIM blob table is + * initially empty, so "resolving" an inode's streams is initially not + * possible. However, we still need to keep track of which blobs, + * identified by SHA-1 message digests, need to be extracted, so we + * "resolve" the inode's streams anyway by allocating a 'struct + * blob_descriptor' for each one. */ + if (extract_flags & WIMLIB_EXTRACT_FLAG_FROM_PIPE) + force = true; + ret = inode_resolve_streams(inode, blob_table, force); + if (ret) + return ret; + for (unsigned i = 0; i < inode->i_num_streams; i++) { + blob = stream_blob_resolved(&inode->i_streams[i]); + if (blob) + blob->out_refcnt = 0; + } + return 0; +} /* - * extract_tree - Extract a file or directory tree from the currently selected - * WIM image. + * For each dentry to be extracted, resolve all streams in the corresponding + * inode and set 'out_refcnt' in all referenced blob_descriptors to 0. * - * @wim: WIMStruct for the WIM file, with the desired image selected - * (as wim->current_image). - * @wim_source_path: - * "Canonical" (i.e. no leading or trailing slashes, path - * separators forwald slashes) path inside the WIM image to - * extract. An empty string means the full image. - * @target: - * Filesystem path to extract the file or directory tree to. - * - * @extract_flags: - * WIMLIB_EXTRACT_FLAG_*. Also, the private flag - * WIMLIB_EXTRACT_FLAG_MULTI_IMAGE will be set if this is being - * called through wimlib_extract_image() with WIMLIB_ALL_IMAGES as - * the image. - * - * @progress_func: - * If non-NULL, progress function for the extraction. The messages - * we may in this function are: + * Possible error codes: WIMLIB_ERR_RESOURCE_NOT_FOUND, WIMLIB_ERR_NOMEM. + */ +static int +dentry_list_resolve_streams(struct list_head *dentry_list, + struct apply_ctx *ctx) +{ + struct wim_dentry *dentry; + int ret; + + list_for_each_entry(dentry, dentry_list, d_extraction_list_node) { + ret = dentry_resolve_streams(dentry, + ctx->extract_flags, + ctx->wim->blob_table); + if (ret) + return ret; + } + return 0; +} + +static int +ref_stream(struct wim_inode_stream *strm, struct wim_dentry *dentry, + struct apply_ctx *ctx) +{ + struct wim_inode *inode = dentry->d_inode; + struct blob_descriptor *blob = stream_blob_resolved(strm); + struct blob_extraction_target *targets; + + if (!blob) + return 0; + + /* Tally the size only for each actual extraction of the stream (not + * additional hard links to the inode). */ + if (inode->i_visited && ctx->supported_features.hard_links) + return 0; + + ctx->progress.extract.total_bytes += blob->size; + ctx->progress.extract.total_streams++; + + if (inode->i_visited) + return 0; + + /* Add each blob to 'ctx->blob_list' only one time, regardless of how + * many extraction targets it will have. */ + if (blob->out_refcnt == 0) { + list_add_tail(&blob->extraction_list, &ctx->blob_list); + ctx->num_blobs_remaining++; + } + + /* Set this stream as an extraction target of 'blob'. */ + + if (blob->out_refcnt < ARRAY_LEN(blob->inline_blob_extraction_targets)) { + targets = blob->inline_blob_extraction_targets; + } else { + struct blob_extraction_target *prev_targets; + size_t alloc_blob_extraction_targets; + + if (blob->out_refcnt == ARRAY_LEN(blob->inline_blob_extraction_targets)) { + prev_targets = NULL; + alloc_blob_extraction_targets = ARRAY_LEN(blob->inline_blob_extraction_targets); + } else { + prev_targets = blob->blob_extraction_targets; + alloc_blob_extraction_targets = blob->alloc_blob_extraction_targets; + } + + if (blob->out_refcnt == alloc_blob_extraction_targets) { + alloc_blob_extraction_targets *= 2; + targets = REALLOC(prev_targets, + alloc_blob_extraction_targets * + sizeof(targets[0])); + if (!targets) + return WIMLIB_ERR_NOMEM; + if (!prev_targets) { + memcpy(targets, + blob->inline_blob_extraction_targets, + sizeof(blob->inline_blob_extraction_targets)); + } + blob->blob_extraction_targets = targets; + blob->alloc_blob_extraction_targets = alloc_blob_extraction_targets; + } + targets = blob->blob_extraction_targets; + } + targets[blob->out_refcnt].inode = inode; + targets[blob->out_refcnt].stream = strm; + blob->out_refcnt++; + return 0; +} + +static int +ref_stream_if_needed(struct wim_dentry *dentry, struct wim_inode *inode, + struct wim_inode_stream *strm, struct apply_ctx *ctx) +{ + bool need_stream = false; + switch (strm->stream_type) { + case STREAM_TYPE_DATA: + if (stream_is_named(strm)) { + /* Named data stream */ + if (ctx->supported_features.named_data_streams) + need_stream = true; + } else if (!(inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY | + FILE_ATTRIBUTE_ENCRYPTED)) + && !(inode_is_symlink(inode) + && !ctx->supported_features.reparse_points + && ctx->supported_features.symlink_reparse_points)) + { + /* + * Unnamed data stream. Skip if any of the following is true: + * + * - file is a directory + * - file is encrypted + * - backend needs to create the file as UNIX symlink + * - backend will extract the stream as externally backed + */ + if (ctx->apply_ops->will_externally_back) { + int ret = (*ctx->apply_ops->will_externally_back)(dentry, ctx); + if (ret > 0) /* Error? */ + return ret; + if (ret < 0) /* Won't externally back? */ + need_stream = true; + } else { + need_stream = true; + } + } + break; + case STREAM_TYPE_REPARSE_POINT: + wimlib_assert(inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT); + if (ctx->supported_features.reparse_points || + (inode_is_symlink(inode) && + ctx->supported_features.symlink_reparse_points)) + need_stream = true; + break; + case STREAM_TYPE_EFSRPC_RAW_DATA: + wimlib_assert(inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED); + if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) { + if (ctx->supported_features.encrypted_directories) + need_stream = true; + } else { + if (ctx->supported_features.encrypted_files) + need_stream = true; + } + break; + } + if (need_stream) + return ref_stream(strm, dentry, ctx); + return 0; +} + +static int +dentry_ref_streams(struct wim_dentry *dentry, struct apply_ctx *ctx) +{ + struct wim_inode *inode = dentry->d_inode; + for (unsigned i = 0; i < inode->i_num_streams; i++) { + int ret = ref_stream_if_needed(dentry, inode, + &inode->i_streams[i], ctx); + if (ret) + return ret; + } + inode->i_visited = 1; + return 0; +} + +/* + * Given a list of dentries to be extracted, build the list of blobs that need + * to be extracted, and for each blob determine the streams to which that blob + * will be extracted. * - * WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN or - * WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN; - * WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_BEGIN; - * WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_END; - * WIMLIB_PROGRESS_MSG_EXTRACT_DENTRY; - * WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS; - * WIMLIB_PROGRESS_MSG_APPLY_TIMESTAMPS; - * WIMLIB_PROGRESS_MSG_EXTRACT_TREE_END or - * WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END. + * This also initializes the extract progress info with byte and blob + * information. * - * Returns 0 on success; nonzero on failure. + * ctx->supported_features must be filled in. */ static int -extract_tree(WIMStruct *wim, const tchar *wim_source_path, const tchar *target, - int extract_flags, wimlib_progress_func_t progress_func) +dentry_list_ref_streams(struct list_head *dentry_list, struct apply_ctx *ctx) { + struct wim_dentry *dentry; int ret; - struct list_head stream_list; - struct apply_args args; - const struct apply_operations *ops; - struct wim_dentry *root; - memset(&args, 0, sizeof(args)); + list_for_each_entry(dentry, dentry_list, d_extraction_list_node) { + ret = dentry_ref_streams(dentry, ctx); + if (ret) + return ret; + } + list_for_each_entry(dentry, dentry_list, d_extraction_list_node) + dentry->d_inode->i_visited = 0; + return 0; +} +static void +dentry_list_build_inode_alias_lists(struct list_head *dentry_list) +{ + struct wim_dentry *dentry; + struct wim_inode *inode; - args.w = wim; - args.target = target; - args.target_nchars = tstrlen(target); - args.extract_flags = extract_flags; - args.progress_func = progress_func; + list_for_each_entry(dentry, dentry_list, d_extraction_list_node) { + inode = dentry->d_inode; + if (!inode->i_visited) + INIT_LIST_HEAD(&inode->i_extraction_aliases); + list_add_tail(&dentry->d_extraction_alias_node, + &inode->i_extraction_aliases); + inode->i_visited = 1; + } + list_for_each_entry(dentry, dentry_list, d_extraction_list_node) + dentry->d_inode->i_visited = 0; +} -#ifdef __WIN32__ - /* Work around defective behavior in Windows where paths longer than 260 - * characters are not supported by default; instead they need to be - * turned into absolute paths and prefixed with "\\?\". */ - args.target_lowlevel_path = MALLOC(WINDOWS_NT_MAX_PATH * sizeof(wchar_t)); - if (!args.target_lowlevel_path) +static void +inode_tally_features(const struct wim_inode *inode, + struct wim_features *features) +{ + if (inode->i_attributes & FILE_ATTRIBUTE_ARCHIVE) + features->archive_files++; + if (inode->i_attributes & FILE_ATTRIBUTE_HIDDEN) + features->hidden_files++; + if (inode->i_attributes & FILE_ATTRIBUTE_SYSTEM) + features->system_files++; + if (inode->i_attributes & FILE_ATTRIBUTE_COMPRESSED) + features->compressed_files++; + if (inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED) { + if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) + features->encrypted_directories++; + else + features->encrypted_files++; + } + if (inode->i_attributes & FILE_ATTRIBUTE_NOT_CONTENT_INDEXED) + features->not_context_indexed_files++; + if (inode->i_attributes & FILE_ATTRIBUTE_SPARSE_FILE) + features->sparse_files++; + if (inode_has_named_data_stream(inode)) + features->named_data_streams++; + if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT) { + features->reparse_points++; + if (inode_is_symlink(inode)) + features->symlink_reparse_points++; + else + features->other_reparse_points++; + } + if (inode->i_security_id != -1) + features->security_descriptors++; + if (inode_has_unix_data(inode)) + features->unix_data++; +} + +/* Tally features necessary to extract a dentry and the corresponding inode. */ +static void +dentry_tally_features(struct wim_dentry *dentry, struct wim_features *features) +{ + struct wim_inode *inode = dentry->d_inode; + + if (dentry_has_short_name(dentry)) + features->short_names++; + + if (inode->i_visited) { + features->hard_links++; + } else { + inode_tally_features(inode, features); + inode->i_visited = 1; + } +} + +/* Tally the features necessary to extract the specified dentries. */ +static void +dentry_list_get_features(struct list_head *dentry_list, + struct wim_features *features) +{ + struct wim_dentry *dentry; + + list_for_each_entry(dentry, dentry_list, d_extraction_list_node) + dentry_tally_features(dentry, features); + + list_for_each_entry(dentry, dentry_list, d_extraction_list_node) + dentry->d_inode->i_visited = 0; +} + +static int +do_feature_check(const struct wim_features *required_features, + const struct wim_features *supported_features, + int extract_flags) +{ + /* Encrypted files. */ + if (required_features->encrypted_files && + !supported_features->encrypted_files) + WARNING("Ignoring EFS-encrypted data of %lu files", + required_features->encrypted_files); + + /* Named data streams. */ + if (required_features->named_data_streams && + !supported_features->named_data_streams) + WARNING("Ignoring named data streams of %lu files", + required_features->named_data_streams); + + /* File attributes. */ + if (!(extract_flags & WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES)) { + /* Note: Don't bother the user about FILE_ATTRIBUTE_ARCHIVE. + * We're an archive program, so theoretically we can do what we + * want with it. */ + + if (required_features->hidden_files && + !supported_features->hidden_files) + WARNING("Ignoring FILE_ATTRIBUTE_HIDDEN of %lu files", + required_features->hidden_files); + + if (required_features->system_files && + !supported_features->system_files) + WARNING("Ignoring FILE_ATTRIBUTE_SYSTEM of %lu files", + required_features->system_files); + + if (required_features->compressed_files && + !supported_features->compressed_files) + WARNING("Ignoring FILE_ATTRIBUTE_COMPRESSED of %lu files", + required_features->compressed_files); + + if (required_features->not_context_indexed_files && + !supported_features->not_context_indexed_files) + WARNING("Ignoring FILE_ATTRIBUTE_NOT_CONTENT_INDEXED of %lu files", + required_features->not_context_indexed_files); + + if (required_features->sparse_files && + !supported_features->sparse_files) + WARNING("Ignoring FILE_ATTRIBUTE_SPARSE_FILE of %lu files", + required_features->sparse_files); + + if (required_features->encrypted_directories && + !supported_features->encrypted_directories) + WARNING("Ignoring FILE_ATTRIBUTE_ENCRYPTED of %lu directories", + required_features->encrypted_directories); + } + + /* Hard links. */ + if (required_features->hard_links && !supported_features->hard_links) + WARNING("Extracting %lu hard links as independent files", + required_features->hard_links); + + /* Symbolic links and reparse points. */ + if ((extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS) && + required_features->symlink_reparse_points && + !supported_features->symlink_reparse_points && + !supported_features->reparse_points) { - ret = WIMLIB_ERR_NOMEM; - goto out; + ERROR("Extraction backend does not support symbolic links!"); + return WIMLIB_ERR_UNSUPPORTED; + } + if (required_features->reparse_points && + !supported_features->reparse_points) + { + if (supported_features->symlink_reparse_points) { + if (required_features->other_reparse_points) { + WARNING("Ignoring reparse data of %lu non-symlink/junction files", + required_features->other_reparse_points); + } + } else { + WARNING("Ignoring reparse data of %lu files", + required_features->reparse_points); + } } - args.target_lowlevel_path_nchars = - GetFullPathName(args.target, WINDOWS_NT_MAX_PATH - 4, - &args.target_lowlevel_path[4], NULL); - if (args.target_lowlevel_path_nchars == 0 || - args.target_lowlevel_path_nchars >= WINDOWS_NT_MAX_PATH - 4) + /* Security descriptors. */ + if (((extract_flags & (WIMLIB_EXTRACT_FLAG_STRICT_ACLS | + WIMLIB_EXTRACT_FLAG_UNIX_DATA)) + == WIMLIB_EXTRACT_FLAG_STRICT_ACLS) && + required_features->security_descriptors && + !supported_features->security_descriptors) { - WARNING("Can't get full path name for \"%ls\"", args.target); - FREE(args.target_lowlevel_path); - args.target_lowlevel_path = NULL; - } else { - wmemcpy(args.target_lowlevel_path, L"\\\\?\\", 4); - args.target_lowlevel_path_nchars += 4; + ERROR("Extraction backend does not support security descriptors!"); + return WIMLIB_ERR_UNSUPPORTED; + } + if (!(extract_flags & WIMLIB_EXTRACT_FLAG_NO_ACLS) && + required_features->security_descriptors && + !supported_features->security_descriptors) + WARNING("Ignoring Windows NT security descriptors of %lu files", + required_features->security_descriptors); + + /* UNIX data. */ + if ((extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) && + required_features->unix_data && !supported_features->unix_data) + { + ERROR("Extraction backend does not support UNIX data!"); + return WIMLIB_ERR_UNSUPPORTED; } -#endif - if (progress_func) { - args.progress.extract.wimfile_name = wim->filename; - args.progress.extract.image = wim->current_image; - args.progress.extract.extract_flags = (extract_flags & - WIMLIB_EXTRACT_MASK_PUBLIC); - args.progress.extract.image_name = wimlib_get_image_name(wim, - wim->current_image); - args.progress.extract.extract_root_wim_source_path = wim_source_path; - args.progress.extract.target = target; + if (required_features->unix_data && + !(extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA)) + { + WARNING("Ignoring UNIX metadata of %lu files", + required_features->unix_data); } -#ifdef WITH_NTFS_3G - if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { - args.vol = ntfs_mount(target, 0); - if (!args.vol) { - ERROR_WITH_ERRNO("Failed to mount NTFS volume `%"TS"'", - target); - ret = WIMLIB_ERR_NTFS_3G; - goto out_free_target_lowlevel_path; + /* DOS Names. */ + if (required_features->short_names && + !supported_features->short_names) + { + if (extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES) { + ERROR("Extraction backend does not support DOS names!"); + return WIMLIB_ERR_UNSUPPORTED; } - ops = &ntfs_apply_operations; - } else -#endif - ops = &normal_apply_operations; + WARNING("Ignoring DOS names of %lu files", + required_features->short_names); + } - root = get_dentry(wim, wim_source_path); - if (!root) { - ERROR("Path \"%"TS"\" does not exist in WIM image %d", - wim_source_path, wim->current_image); - ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST; - goto out_ntfs_umount; + /* Timestamps. */ + if ((extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_TIMESTAMPS) && + !supported_features->timestamps) + { + ERROR("Extraction backend does not support timestamps!"); + return WIMLIB_ERR_UNSUPPORTED; } - args.extract_root = root; - /* Calculate the actual filename component of each extracted dentry, and - * in the process set the dentry->needs_extraction flag on dentries that - * will be extracted. */ - ret = for_dentry_in_tree(root, dentry_calculate_extraction_path, &args); - if (ret) - goto out_dentry_reset_needs_extraction; + return 0; +} - /* Build a list of the streams that need to be extracted */ - find_streams_for_extraction(root, - &stream_list, - wim->lookup_table, extract_flags); +static const struct apply_operations * +select_apply_operations(int extract_flags) +{ +#ifdef WITH_NTFS_3G + if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) + return &ntfs_3g_apply_ops; +#endif +#ifdef __WIN32__ + return &win32_apply_ops; +#else + return &unix_apply_ops; +#endif +} - /* Calculate the number of bytes of data that will be extracted */ - calculate_bytes_to_extract(&stream_list, extract_flags, - &args.progress); +static int +extract_trees(WIMStruct *wim, struct wim_dentry **trees, size_t num_trees, + const tchar *target, int extract_flags) +{ + const struct apply_operations *ops; + struct apply_ctx *ctx; + int ret; + LIST_HEAD(dentry_list); if (extract_flags & WIMLIB_EXTRACT_FLAG_TO_STDOUT) { - ret = extract_dentry_to_stdout(root); - goto out_dentry_reset_needs_extraction; + ret = extract_dentries_to_stdout(trees, num_trees, + wim->blob_table); + goto out; } - if (progress_func) { - progress_func(*wim_source_path ? WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN : - WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN, - &args.progress); + num_trees = remove_duplicate_trees(trees, num_trees); + num_trees = remove_contained_trees(trees, num_trees); + + ops = select_apply_operations(extract_flags); + + if (num_trees > 1 && ops->single_tree_only) { + ERROR("Extracting multiple directory trees " + "at once is not supported in %s extraction mode!", + ops->name); + ret = WIMLIB_ERR_UNSUPPORTED; + goto out; } - /* If a sequential extraction was specified, sort the streams to be - * extracted by their position in the WIM file, so that the WIM file can - * be read sequentially. */ - if (extract_flags & WIMLIB_EXTRACT_FLAG_SEQUENTIAL) { - ret = sort_stream_list_by_wim_position(&stream_list); - if (ret != 0) { - WARNING("Falling back to non-sequential extraction"); - extract_flags &= ~WIMLIB_EXTRACT_FLAG_SEQUENTIAL; - } + ctx = CALLOC(1, ops->context_size); + if (!ctx) { + ret = WIMLIB_ERR_NOMEM; + goto out; } - if (progress_func) { - progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_BEGIN, - &args.progress); + ctx->wim = wim; + ctx->target = target; + ctx->target_nchars = tstrlen(target); + ctx->extract_flags = extract_flags; + if (ctx->wim->progfunc) { + ctx->progfunc = ctx->wim->progfunc; + ctx->progctx = ctx->wim->progctx; + ctx->progress.extract.image = wim->current_image; + ctx->progress.extract.extract_flags = (extract_flags & + WIMLIB_EXTRACT_MASK_PUBLIC); + ctx->progress.extract.wimfile_name = wim->filename; + ctx->progress.extract.image_name = wimlib_get_image_name(wim, + wim->current_image); + ctx->progress.extract.target = target; } + INIT_LIST_HEAD(&ctx->blob_list); + filedes_invalidate(&ctx->tmpfile_fd); + ctx->apply_ops = ops; - /* Make the directory structure and extract empty files */ - args.extract_flags |= WIMLIB_EXTRACT_FLAG_NO_STREAMS; - args.apply_dentry = ops->apply_dentry; - ret = for_dentry_in_tree(root, maybe_apply_dentry, &args); - args.extract_flags &= ~WIMLIB_EXTRACT_FLAG_NO_STREAMS; + ret = (*ops->get_supported_features)(target, &ctx->supported_features); if (ret) - goto out_dentry_reset_needs_extraction; + goto out_cleanup; - if (progress_func) { - progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_END, - &args.progress); - } + build_dentry_list(&dentry_list, trees, num_trees, + !(extract_flags & + WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE)); - if (extract_flags & WIMLIB_EXTRACT_FLAG_RPFIX) { - args.target_realpath = realpath(target, NULL); - if (!args.target_realpath) { - ret = WIMLIB_ERR_NOMEM; - goto out_dentry_reset_needs_extraction; - } - args.target_realpath_len = tstrlen(args.target_realpath); - } + dentry_list_get_features(&dentry_list, &ctx->required_features); + + ret = do_feature_check(&ctx->required_features, &ctx->supported_features, + ctx->extract_flags); + if (ret) + goto out_cleanup; - /* Extract non-empty files */ - ret = apply_stream_list(&stream_list, &args, ops, progress_func); + ret = dentry_list_calculate_extraction_names(&dentry_list, ctx); if (ret) - goto out_free_target_realpath; + goto out_cleanup; - if (progress_func) { - progress_func(WIMLIB_PROGRESS_MSG_APPLY_TIMESTAMPS, - &args.progress); + if (unlikely(list_empty(&dentry_list))) { + WARNING("There is nothing to extract!"); + goto out_cleanup; } - /* Apply timestamps */ - ret = for_dentry_in_tree_depth(root, - ops->apply_dentry_timestamps, &args); + ret = dentry_list_resolve_streams(&dentry_list, ctx); if (ret) - goto out_free_target_realpath; - - if (progress_func) { - progress_func(*wim_source_path ? WIMLIB_PROGRESS_MSG_EXTRACT_TREE_END : - WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END, - &args.progress); - } -out_free_target_realpath: - FREE(args.target_realpath); -out_dentry_reset_needs_extraction: - for_dentry_in_tree(root, dentry_reset_needs_extraction, NULL); -out_ntfs_umount: -#ifdef WITH_NTFS_3G - /* Unmount the NTFS volume */ - if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { - if (ntfs_umount(args.vol, FALSE) != 0) { - ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%"TS"'", - args.target); - if (ret == 0) - ret = WIMLIB_ERR_NTFS_3G; + goto out_cleanup; + + dentry_list_build_inode_alias_lists(&dentry_list); + + ret = dentry_list_ref_streams(&dentry_list, ctx); + if (ret) + goto out_cleanup; + + if (extract_flags & WIMLIB_EXTRACT_FLAG_FROM_PIPE) { + /* When extracting from a pipe, the number of bytes of data to + * extract can't be determined in the normal way (examining the + * blob table), since at this point all we have is a set of + * SHA-1 message digests of blobs that need to be extracted. + * However, we can get a reasonably accurate estimate by taking + * from the corresponding in the WIM XML + * data. This does assume that a full image is being extracted, + * but currently there is no API for doing otherwise. (Also, + * subtract from this if hard links are + * supported by the extraction mode.) */ + ctx->progress.extract.total_bytes = + wim_info_get_image_total_bytes(wim->wim_info, + wim->current_image); + if (ctx->supported_features.hard_links) { + ctx->progress.extract.total_bytes -= + wim_info_get_image_hard_link_bytes(wim->wim_info, + wim->current_image); } } -#endif -out_free_target_lowlevel_path: -#ifdef __WIN32__ - FREE(args.target_lowlevel_path); -#endif + + ret = extract_progress(ctx, + ((extract_flags & WIMLIB_EXTRACT_FLAG_IMAGEMODE) ? + WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN : + WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN)); + if (ret) + goto out_cleanup; + + ret = (*ops->extract)(&dentry_list, ctx); + if (ret) + goto out_cleanup; + + if (ctx->progress.extract.completed_bytes < + ctx->progress.extract.total_bytes) + { + ctx->progress.extract.completed_bytes = + ctx->progress.extract.total_bytes; + ret = extract_progress(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS); + if (ret) + goto out_cleanup; + } + + ret = extract_progress(ctx, + ((extract_flags & WIMLIB_EXTRACT_FLAG_IMAGEMODE) ? + WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END : + WIMLIB_PROGRESS_MSG_EXTRACT_TREE_END)); +out_cleanup: + destroy_blob_list(&ctx->blob_list); + destroy_dentry_list(&dentry_list); + FREE(ctx); out: return ret; } -/* Validates a single wimlib_extract_command, mostly checking to make sure the - * extract flags make sense. */ static int -check_extract_command(struct wimlib_extract_command *cmd, int wim_header_flags) +mkdir_if_needed(const tchar *target) { - int extract_flags; - bool is_entire_image = (cmd->wim_source_path[0] == T('\0')); + if (!tmkdir(target, 0755)) + return 0; - /* Empty destination path? */ - if (cmd->fs_dest_path[0] == T('\0')) - return WIMLIB_ERR_INVALID_PARAM; + if (errno == EEXIST) + return 0; + +#ifdef __WIN32__ + /* _wmkdir() fails with EACCES if called on a drive root directory. */ + if (errno == EACCES) + return 0; +#endif + + ERROR_WITH_ERRNO("Failed to create directory \"%"TS"\"", target); + return WIMLIB_ERR_MKDIR; +} - extract_flags = cmd->extract_flags; +/* Make sure the extraction flags make sense, and update them if needed. */ +static int +check_extract_flags(const WIMStruct *wim, int *extract_flags_p) +{ + int extract_flags = *extract_flags_p; + + /* Check for invalid flag combinations */ - /* Specified both symlink and hardlink modes? */ if ((extract_flags & - (WIMLIB_EXTRACT_FLAG_SYMLINK | - WIMLIB_EXTRACT_FLAG_HARDLINK)) == (WIMLIB_EXTRACT_FLAG_SYMLINK | - WIMLIB_EXTRACT_FLAG_HARDLINK)) + (WIMLIB_EXTRACT_FLAG_NO_ACLS | + WIMLIB_EXTRACT_FLAG_STRICT_ACLS)) == (WIMLIB_EXTRACT_FLAG_NO_ACLS | + WIMLIB_EXTRACT_FLAG_STRICT_ACLS)) return WIMLIB_ERR_INVALID_PARAM; -#ifdef __WIN32__ - /* Wanted UNIX data on Windows? */ - if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) { - ERROR("Extracting UNIX data is not supported on Windows"); - return WIMLIB_ERR_INVALID_PARAM; - } - /* Wanted linked extraction on Windows? (XXX This is possible, just not - * implemented yet.) */ - if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | - WIMLIB_EXTRACT_FLAG_HARDLINK)) - { - ERROR("Linked extraction modes are not supported on Windows"); + if ((extract_flags & + (WIMLIB_EXTRACT_FLAG_RPFIX | + WIMLIB_EXTRACT_FLAG_NORPFIX)) == (WIMLIB_EXTRACT_FLAG_RPFIX | + WIMLIB_EXTRACT_FLAG_NORPFIX)) return WIMLIB_ERR_INVALID_PARAM; + +#ifndef WITH_NTFS_3G + if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { + ERROR("wimlib was compiled without support for NTFS-3g, so\n" + " it cannot apply a WIM image directly to an NTFS volume."); + return WIMLIB_ERR_UNSUPPORTED; } #endif - if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { - /* NTFS-3g extraction mode requested */ -#ifdef WITH_NTFS_3G - if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | - WIMLIB_EXTRACT_FLAG_HARDLINK))) { - ERROR("Cannot specify symlink or hardlink flags when applying\n" - " directly to a NTFS volume"); - return WIMLIB_ERR_INVALID_PARAM; - } - if (!is_entire_image && - (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS)) - { - ERROR("When applying directly to a NTFS volume you can " - "only extract a full image, not part of one"); - return WIMLIB_ERR_INVALID_PARAM; - } - if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) { - ERROR("Cannot restore UNIX-specific data in " - "the NTFS extraction mode"); - return WIMLIB_ERR_INVALID_PARAM; - } + if (extract_flags & WIMLIB_EXTRACT_FLAG_WIMBOOT) { +#ifdef __WIN32__ + if (!wim->filename) + return WIMLIB_ERR_NO_FILENAME; #else - ERROR("wimlib was compiled without support for NTFS-3g, so"); - ERROR("we cannot apply a WIM image directly to a NTFS volume"); + ERROR("WIMBoot extraction is only supported on Windows!"); return WIMLIB_ERR_UNSUPPORTED; #endif } - if ((extract_flags & (WIMLIB_EXTRACT_FLAG_RPFIX | - WIMLIB_EXTRACT_FLAG_NORPFIX)) == - (WIMLIB_EXTRACT_FLAG_RPFIX | WIMLIB_EXTRACT_FLAG_NORPFIX)) - { - ERROR("Cannot specify RPFIX and NORPFIX flags at the same time!"); - return WIMLIB_ERR_INVALID_PARAM; - } if ((extract_flags & (WIMLIB_EXTRACT_FLAG_RPFIX | - WIMLIB_EXTRACT_FLAG_NORPFIX)) == 0) + WIMLIB_EXTRACT_FLAG_NORPFIX | + WIMLIB_EXTRACT_FLAG_IMAGEMODE)) == + WIMLIB_EXTRACT_FLAG_IMAGEMODE) { - /* Do reparse point fixups by default if the WIM header says - * they are enabled and we are extracting a full image. */ - if ((wim_header_flags & WIM_HDR_FLAG_RP_FIX) && is_entire_image) + /* For full-image extraction, do reparse point fixups by default + * if the WIM header says they are enabled. */ + if (wim->hdr.flags & WIM_HDR_FLAG_RP_FIX) extract_flags |= WIMLIB_EXTRACT_FLAG_RPFIX; } - if (!is_entire_image && (extract_flags & WIMLIB_EXTRACT_FLAG_RPFIX)) { - ERROR("Cannot specify --rpfix when not extracting entire image"); - return WIMLIB_ERR_INVALID_PARAM; - } - - cmd->extract_flags = extract_flags; + *extract_flags_p = extract_flags; return 0; } - -/* Internal function to execute extraction commands for a WIM image. */ -static int -do_wimlib_extract_files(WIMStruct *wim, - int image, - struct wimlib_extract_command *cmds, - size_t num_cmds, - wimlib_progress_func_t progress_func) +static u32 +get_wildcard_flags(int extract_flags) { - int ret; - bool found_link_cmd = false; - bool found_nolink_cmd = false; + u32 wildcard_flags = 0; - /* Select the image from which we are extracting files */ - ret = select_wim_image(wim, image); - if (ret) - return ret; + if (extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_GLOB) + wildcard_flags |= WILDCARD_FLAG_ERROR_IF_NO_MATCH; + else + wildcard_flags |= WILDCARD_FLAG_WARN_IF_NO_MATCH; - /* Make sure there are no streams in the WIM that have not been - * checksummed yet. */ - ret = wim_checksum_unhashed_streams(wim); - if (ret) - return ret; + if (default_ignore_case) + wildcard_flags |= WILDCARD_FLAG_CASE_INSENSITIVE; - /* Check for problems with the extraction commands */ - for (size_t i = 0; i < num_cmds; i++) { - ret = check_extract_command(&cmds[i], wim->hdr.flags); - if (ret) - return ret; - if (cmds[i].extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | - WIMLIB_EXTRACT_FLAG_HARDLINK)) { - found_link_cmd = true; - } else { - found_nolink_cmd = true; - } - if (found_link_cmd && found_nolink_cmd) { - ERROR("Symlink or hardlink extraction mode must " - "be set on all extraction commands"); - return WIMLIB_ERR_INVALID_PARAM; - } - } + return wildcard_flags; +} - /* Execute the extraction commands */ - for (size_t i = 0; i < num_cmds; i++) { - ret = extract_tree(wim, - cmds[i].wim_source_path, - cmds[i].fs_dest_path, - cmds[i].extract_flags, - progress_func); - if (ret) - return ret; +struct append_dentry_ctx { + struct wim_dentry **dentries; + size_t num_dentries; + size_t num_alloc_dentries; +}; + +static int +append_dentry_cb(struct wim_dentry *dentry, void *_ctx) +{ + struct append_dentry_ctx *ctx = _ctx; + + if (ctx->num_dentries == ctx->num_alloc_dentries) { + struct wim_dentry **new_dentries; + size_t new_length; + + new_length = max(ctx->num_alloc_dentries + 8, + ctx->num_alloc_dentries * 3 / 2); + new_dentries = REALLOC(ctx->dentries, + new_length * sizeof(ctx->dentries[0])); + if (new_dentries == NULL) + return WIMLIB_ERR_NOMEM; + ctx->dentries = new_dentries; + ctx->num_alloc_dentries = new_length; } + ctx->dentries[ctx->num_dentries++] = dentry; return 0; } -/* Extract files or directories from a WIM image. */ -WIMLIBAPI int -wimlib_extract_files(WIMStruct *wim, - int image, - const struct wimlib_extract_command *cmds, - size_t num_cmds, - int default_extract_flags, - WIMStruct **additional_swms, - unsigned num_additional_swms, - wimlib_progress_func_t progress_func) +static int +do_wimlib_extract_paths(WIMStruct *wim, int image, const tchar *target, + const tchar * const *paths, size_t num_paths, + int extract_flags) { int ret; - struct wimlib_extract_command *cmds_copy; - int all_flags = 0; + struct wim_dentry **trees; + size_t num_trees; - default_extract_flags &= WIMLIB_EXTRACT_MASK_PUBLIC; + if (wim == NULL || target == NULL || target[0] == T('\0') || + (num_paths != 0 && paths == NULL)) + return WIMLIB_ERR_INVALID_PARAM; - ret = verify_swm_set(wim, additional_swms, num_additional_swms); + ret = check_extract_flags(wim, &extract_flags); if (ret) - goto out; + return ret; - if (num_cmds == 0) - goto out; + ret = select_wim_image(wim, image); + if (ret) + return ret; - if (num_additional_swms) - merge_lookup_tables(wim, additional_swms, num_additional_swms); + ret = wim_checksum_unhashed_blobs(wim); + if (ret) + return ret; - cmds_copy = CALLOC(num_cmds, sizeof(cmds[0])); - if (!cmds_copy) { - ret = WIMLIB_ERR_NOMEM; - goto out_restore_lookup_table; + if ((extract_flags & (WIMLIB_EXTRACT_FLAG_NTFS | + WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE)) == + (WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE)) + { + ret = mkdir_if_needed(target); + if (ret) + return ret; } - for (size_t i = 0; i < num_cmds; i++) { - cmds_copy[i].extract_flags = (default_extract_flags | - cmds[i].extract_flags) - & WIMLIB_EXTRACT_MASK_PUBLIC; - all_flags |= cmds_copy[i].extract_flags; + if (extract_flags & WIMLIB_EXTRACT_FLAG_GLOB_PATHS) { - cmds_copy[i].wim_source_path = canonicalize_wim_path(cmds[i].wim_source_path); - if (!cmds_copy[i].wim_source_path) { - ret = WIMLIB_ERR_NOMEM; - goto out_free_cmds_copy; + struct append_dentry_ctx append_dentry_ctx = { + .dentries = NULL, + .num_dentries = 0, + .num_alloc_dentries = 0, + }; + + u32 wildcard_flags = get_wildcard_flags(extract_flags); + + for (size_t i = 0; i < num_paths; i++) { + tchar *path = canonicalize_wim_path(paths[i]); + if (path == NULL) { + ret = WIMLIB_ERR_NOMEM; + trees = append_dentry_ctx.dentries; + goto out_free_trees; + } + ret = expand_wildcard(wim, path, + append_dentry_cb, + &append_dentry_ctx, + wildcard_flags); + FREE(path); + if (ret) { + trees = append_dentry_ctx.dentries; + goto out_free_trees; + } } + trees = append_dentry_ctx.dentries; + num_trees = append_dentry_ctx.num_dentries; + } else { + trees = MALLOC(num_paths * sizeof(trees[0])); + if (trees == NULL) + return WIMLIB_ERR_NOMEM; - cmds_copy[i].fs_dest_path = canonicalize_fs_path(cmds[i].fs_dest_path); - if (!cmds_copy[i].fs_dest_path) { - ret = WIMLIB_ERR_NOMEM; - goto out_free_cmds_copy; + for (size_t i = 0; i < num_paths; i++) { + + tchar *path = canonicalize_wim_path(paths[i]); + if (path == NULL) { + ret = WIMLIB_ERR_NOMEM; + goto out_free_trees; + } + + trees[i] = get_dentry(wim, path, + WIMLIB_CASE_PLATFORM_DEFAULT); + FREE(path); + if (trees[i] == NULL) { + ERROR("Path \"%"TS"\" does not exist " + "in WIM image %d", + paths[i], wim->current_image); + ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST; + goto out_free_trees; + } } + num_trees = num_paths; + } + if (num_trees == 0) { + ret = 0; + goto out_free_trees; } - ret = do_wimlib_extract_files(wim, image, - cmds_copy, num_cmds, - progress_func); - if (all_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | - WIMLIB_EXTRACT_FLAG_HARDLINK)) - { - for_lookup_table_entry(wim->lookup_table, - lte_free_extracted_file, NULL); - } -out_free_cmds_copy: - for (size_t i = 0; i < num_cmds; i++) { - FREE(cmds_copy[i].wim_source_path); - FREE(cmds_copy[i].fs_dest_path); - } - FREE(cmds_copy); -out_restore_lookup_table: - if (num_additional_swms) - unmerge_lookup_table(wim); -out: + ret = extract_trees(wim, trees, num_trees, target, extract_flags); +out_free_trees: + FREE(trees); return ret; } -/* - * Extracts an image from a WIM file. - * - * @wim: WIMStruct for the WIM file. - * - * @image: Number of the single image to extract. - * - * @target: Directory or NTFS volume to extract the image to. - * - * @extract_flags: Bitwise or of WIMLIB_EXTRACT_FLAG_*. - * - * @progress_func: If non-NULL, a progress function to be called - * periodically. - * - * Returns 0 on success; nonzero on failure. - */ static int extract_single_image(WIMStruct *wim, int image, - const tchar *target, int extract_flags, - wimlib_progress_func_t progress_func) + const tchar *target, int extract_flags) { - int ret; - tchar *target_copy = canonicalize_fs_path(target); - if (!target_copy) - return WIMLIB_ERR_NOMEM; - struct wimlib_extract_command cmd = { - .wim_source_path = T(""), - .fs_dest_path = target_copy, - .extract_flags = extract_flags, - }; - ret = do_wimlib_extract_files(wim, image, &cmd, 1, progress_func); - FREE(target_copy); - return ret; + const tchar *path = WIMLIB_WIM_ROOT_PATH; + extract_flags |= WIMLIB_EXTRACT_FLAG_IMAGEMODE; + return do_wimlib_extract_paths(wim, image, target, &path, 1, extract_flags); } static const tchar * const filename_forbidden_chars = @@ -1145,10 +1773,7 @@ image_name_ok_as_dir(const tchar *image_name) /* Extracts all images from the WIM to the directory @target, with the images * placed in subdirectories named by their image names. */ static int -extract_all_images(WIMStruct *wim, - const tchar *target, - int extract_flags, - wimlib_progress_func_t progress_func) +extract_all_images(WIMStruct *wim, const tchar *target, int extract_flags) { size_t image_name_max_len = max(xml_get_max_image_name_len(wim), 20); size_t output_path_len = tstrlen(target); @@ -1156,26 +1781,15 @@ extract_all_images(WIMStruct *wim, int ret; int image; const tchar *image_name; - struct stat stbuf; - if (tstat(target, &stbuf)) { - if (errno == ENOENT) - { - if (tmkdir(target, S_IRWXU | S_IRGRP | S_IXGRP | - S_IROTH | S_IXOTH)) - { - ERROR_WITH_ERRNO("Failed to create directory \"%"TS"\"", target); - return WIMLIB_ERR_MKDIR; - } - } else { - ERROR_WITH_ERRNO("Failed to stat \"%"TS"\"", target); - return WIMLIB_ERR_STAT; - } - } else if (!S_ISDIR(stbuf.st_mode)) { - ERROR("\"%"TS"\" is not a directory", target); - return WIMLIB_ERR_NOTDIR; + if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { + ERROR("Cannot extract multiple images in NTFS extraction mode."); + return WIMLIB_ERR_INVALID_PARAM; } + ret = mkdir_if_needed(target); + if (ret) + return ret; tmemcpy(buf, target, output_path_len); buf[output_path_len] = OS_PREFERRED_PATH_SEPARATOR; for (image = 1; image <= wim->hdr.image_count; image++) { @@ -1187,53 +1801,245 @@ extract_all_images(WIMStruct *wim, * Use image number instead. */ tsprintf(buf + output_path_len + 1, T("%d"), image); } - ret = extract_single_image(wim, image, buf, extract_flags, - progress_func); + ret = extract_single_image(wim, image, buf, extract_flags); if (ret) return ret; } return 0; } -/* Extracts a single image or all images from a WIM file to a directory or NTFS - * volume. */ +static int +do_wimlib_extract_image(WIMStruct *wim, int image, const tchar *target, + int extract_flags) +{ + if (extract_flags & (WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE | + WIMLIB_EXTRACT_FLAG_TO_STDOUT | + WIMLIB_EXTRACT_FLAG_GLOB_PATHS)) + return WIMLIB_ERR_INVALID_PARAM; + + if (image == WIMLIB_ALL_IMAGES) + return extract_all_images(wim, target, extract_flags); + else + return extract_single_image(wim, image, target, extract_flags); +} + + +/**************************************************************************** + * Extraction API * + ****************************************************************************/ + +WIMLIBAPI int +wimlib_extract_paths(WIMStruct *wim, int image, const tchar *target, + const tchar * const *paths, size_t num_paths, + int extract_flags) +{ + if (extract_flags & ~WIMLIB_EXTRACT_MASK_PUBLIC) + return WIMLIB_ERR_INVALID_PARAM; + + return do_wimlib_extract_paths(wim, image, target, paths, num_paths, + extract_flags); +} + WIMLIBAPI int -wimlib_extract_image(WIMStruct *wim, - int image, - const tchar *target, - int extract_flags, - WIMStruct **additional_swms, - unsigned num_additional_swms, - wimlib_progress_func_t progress_func) +wimlib_extract_pathlist(WIMStruct *wim, int image, const tchar *target, + const tchar *path_list_file, int extract_flags) { int ret; + tchar **paths; + size_t num_paths; + void *mem; + + ret = read_path_list_file(path_list_file, &paths, &num_paths, &mem); + if (ret) { + ERROR("Failed to read path list file \"%"TS"\"", + path_list_file); + return ret; + } - extract_flags &= WIMLIB_EXTRACT_MASK_PUBLIC; + ret = wimlib_extract_paths(wim, image, target, + (const tchar * const *)paths, num_paths, + extract_flags); + FREE(paths); + FREE(mem); + return ret; +} - ret = verify_swm_set(wim, additional_swms, num_additional_swms); +WIMLIBAPI int +wimlib_extract_image_from_pipe_with_progress(int pipe_fd, + const tchar *image_num_or_name, + const tchar *target, + int extract_flags, + wimlib_progress_func_t progfunc, + void *progctx) +{ + int ret; + WIMStruct *pwm; + struct filedes *in_fd; + int image; + unsigned i; + + if (extract_flags & ~WIMLIB_EXTRACT_MASK_PUBLIC) + return WIMLIB_ERR_INVALID_PARAM; + + /* Read the WIM header from the pipe and get a WIMStruct to represent + * the pipable WIM. Caveats: Unlike getting a WIMStruct with + * wimlib_open_wim(), getting a WIMStruct in this way will result in an + * empty blob table, no XML data read, and no filename set. */ + ret = open_wim_as_WIMStruct(&pipe_fd, WIMLIB_OPEN_FLAG_FROM_PIPE, &pwm, + progfunc, progctx); if (ret) return ret; - if (num_additional_swms) - merge_lookup_tables(wim, additional_swms, num_additional_swms); + /* Sanity check to make sure this is a pipable WIM. */ + if (pwm->hdr.magic != PWM_MAGIC) { + ERROR("The WIM being read from file descriptor %d " + "is not pipable!", pipe_fd); + ret = WIMLIB_ERR_NOT_PIPABLE; + goto out_wimlib_free; + } - if (image == WIMLIB_ALL_IMAGES) { - ret = extract_all_images(wim, target, - extract_flags | WIMLIB_EXTRACT_FLAG_MULTI_IMAGE, - progress_func); - } else { - ret = extract_single_image(wim, image, target, extract_flags, - progress_func); + /* Sanity check to make sure the first part of a pipable split WIM is + * sent over the pipe first. */ + if (pwm->hdr.part_number != 1) { + ERROR("The first part of the split WIM must be " + "sent over the pipe first."); + ret = WIMLIB_ERR_INVALID_PIPABLE_WIM; + goto out_wimlib_free; } - if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | - WIMLIB_EXTRACT_FLAG_HARDLINK)) + in_fd = &pwm->in_fd; + wimlib_assert(in_fd->offset == WIM_HEADER_DISK_SIZE); + + /* As mentioned, the WIMStruct we created from the pipe does not have + * XML data yet. Fix this by reading the extra copy of the XML data + * that directly follows the header in pipable WIMs. (Note: see + * write_pipable_wim() for more details about the format of pipable + * WIMs.) */ { - for_lookup_table_entry(wim->lookup_table, - lte_free_extracted_file, - NULL); + struct blob_descriptor xml_blob; + struct wim_resource_descriptor xml_rdesc; + ret = read_pwm_blob_header(pwm, &xml_blob, &xml_rdesc, 0, NULL); + if (ret) + goto out_wimlib_free; + + if (!xml_blob.is_metadata) { + ERROR("Expected XML data, but found non-metadata resource."); + ret = WIMLIB_ERR_INVALID_PIPABLE_WIM; + goto out_wimlib_free; + } + + wim_res_desc_to_hdr(&xml_rdesc, &pwm->hdr.xml_data_reshdr); + + ret = read_wim_xml_data(pwm); + if (ret) + goto out_wimlib_free; + + if (wim_info_get_num_images(pwm->wim_info) != pwm->hdr.image_count) { + ERROR("Image count in XML data is not the same as in WIM header."); + ret = WIMLIB_ERR_IMAGE_COUNT; + goto out_wimlib_free; + } + } + + /* Get image index (this may use the XML data that was just read to + * resolve an image name). */ + if (image_num_or_name) { + image = wimlib_resolve_image(pwm, image_num_or_name); + if (image == WIMLIB_NO_IMAGE) { + ERROR("\"%"TS"\" is not a valid image in the pipable WIM!", + image_num_or_name); + ret = WIMLIB_ERR_INVALID_IMAGE; + goto out_wimlib_free; + } else if (image == WIMLIB_ALL_IMAGES) { + ERROR("Applying all images from a pipe is not supported!"); + ret = WIMLIB_ERR_INVALID_IMAGE; + goto out_wimlib_free; + } + } else { + if (pwm->hdr.image_count != 1) { + ERROR("No image was specified, but the pipable WIM " + "did not contain exactly 1 image"); + ret = WIMLIB_ERR_INVALID_IMAGE; + goto out_wimlib_free; + } + image = 1; } - if (num_additional_swms) - unmerge_lookup_table(wim); + + /* Load the needed metadata resource. */ + for (i = 1; i <= pwm->hdr.image_count; i++) { + struct blob_descriptor *metadata_blob; + struct wim_image_metadata *imd; + struct wim_resource_descriptor *metadata_rdesc; + + metadata_blob = new_blob_descriptor(); + if (metadata_blob == NULL) { + ret = WIMLIB_ERR_NOMEM; + goto out_wimlib_free; + } + metadata_rdesc = MALLOC(sizeof(struct wim_resource_descriptor)); + if (metadata_rdesc == NULL) { + ret = WIMLIB_ERR_NOMEM; + free_blob_descriptor(metadata_blob); + goto out_wimlib_free; + } + + ret = read_pwm_blob_header(pwm, metadata_blob, metadata_rdesc, 0, NULL); + imd = pwm->image_metadata[i - 1]; + imd->metadata_blob = metadata_blob; + if (ret) { + FREE(metadata_rdesc); + goto out_wimlib_free; + } + + if (!metadata_blob->is_metadata) { + ERROR("Expected metadata resource, but found " + "non-metadata resource."); + ret = WIMLIB_ERR_INVALID_PIPABLE_WIM; + goto out_wimlib_free; + } + + if (i == image) { + /* Metadata resource is for the image being extracted. + * Parse it and save the metadata in memory. */ + ret = read_metadata_resource(imd); + if (ret) + goto out_wimlib_free; + imd->modified = 1; + } else { + /* Metadata resource is not for the image being + * extracted. Skip over it. */ + ret = skip_wim_resource(metadata_rdesc); + if (ret) + goto out_wimlib_free; + } + } + /* Extract the image. */ + extract_flags |= WIMLIB_EXTRACT_FLAG_FROM_PIPE; + ret = do_wimlib_extract_image(pwm, image, target, extract_flags); + /* Clean up and return. */ +out_wimlib_free: + wimlib_free(pwm); return ret; } + + +WIMLIBAPI int +wimlib_extract_image_from_pipe(int pipe_fd, const tchar *image_num_or_name, + const tchar *target, int extract_flags) +{ + return wimlib_extract_image_from_pipe_with_progress(pipe_fd, + image_num_or_name, + target, + extract_flags, + NULL, + NULL); +} + +WIMLIBAPI int +wimlib_extract_image(WIMStruct *wim, int image, const tchar *target, + int extract_flags) +{ + if (extract_flags & ~WIMLIB_EXTRACT_MASK_PUBLIC) + return WIMLIB_ERR_INVALID_PARAM; + return do_wimlib_extract_image(wim, image, target, extract_flags); +}