/* * write.c * * Support for writing WIM files; write a WIM file, overwrite a WIM file, write * compressed file resources, etc. * * Copyright (C) 2010 Carl Thijssen * Copyright (C) 2012 Eric Biggers * * wimlib - Library for working with WIM files * * This library 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 2.1 of the License, or (at your option) any * later version. * * This library 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 Lesser General Public License along * with this library; if not, write to the Free Software Foundation, Inc., 59 * Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "wimlib_internal.h" #include "io.h" #include "lookup_table.h" #include "dentry.h" #include "sha1.h" #include "lzx.h" #include "xml.h" #include "xpress.h" #include /* Used for buffering FILE IO */ #define BUFFER_SIZE 4096 /* * Copies bytes between two file streams. * * Copies @len bytes from @in to @out, at the current position in @out, and at * an offset of @in_offset in @in. */ int copy_between_files(FILE *in, off_t in_offset, FILE *out, size_t len) { u8 buf[BUFFER_SIZE]; size_t n; if (fseeko(in, in_offset, SEEK_SET) != 0) { ERROR("Failed to seek to byte %"PRIu64" of input file: %m\n", in_offset); return WIMLIB_ERR_READ; } /* To reduce memory usage and improve speed, read and write BUFFER_SIZE * bytes at a time. */ while (len != 0) { n = min(len, BUFFER_SIZE); if (fread(buf, 1, n, in) != n) { if (feof(in)) { ERROR("Unexpected EOF when copying data " "between files\n"); } else { ERROR("Error copying data between files: %m\n"); } return WIMLIB_ERR_READ; } if (fwrite(buf, 1, n, out) != n) { ERROR("Error copying data between files: %m\n"); return WIMLIB_ERR_WRITE; } len -= n; } return 0; } /* * Uncompresses a WIM file resource and writes it uncompressed to a file stream. * * @in: The file stream that contains the file resource. * @size: The size of the resource in the input file. * @original_size: The original (uncompressed) size of the resource. * @offset: The offset of the start of the resource in @in. * @input_ctype: The compression type of the resource in @in. * @out: The file stream to write the file resource to. */ static int uncompress_resource(FILE *in, u64 size, u64 original_size, off_t offset, int input_ctype, FILE *out) { int ret; u8 buf[WIM_CHUNK_SIZE]; /* Determine how many compressed chunks the file is divided into. */ u64 num_chunks; u64 i; u64 uncompressed_offset; u64 uncompressed_chunk_size; num_chunks = (original_size + WIM_CHUNK_SIZE - 1) / WIM_CHUNK_SIZE; for (i = 0; i < num_chunks; i++) { uncompressed_offset = i * WIM_CHUNK_SIZE; uncompressed_chunk_size = min(WIM_CHUNK_SIZE, original_size - uncompressed_offset); ret = read_resource(in, size, original_size, offset, input_ctype, uncompressed_chunk_size, uncompressed_offset, buf); if (ret != 0) return ret; if (fwrite(buf, 1, uncompressed_chunk_size, out) != uncompressed_chunk_size) { ERROR("Failed to write file resource: %m\n"); return WIMLIB_ERR_WRITE; } } return 0; } /* * Transfers a file resource between two files, writing it compressed. The file * resource in the input file may be either compressed or uncompressed. * Alternatively, the input resource may be in-memory, but it must be * uncompressed. * * @in: The file stream that contains the file resource. Ignored * if uncompressed_resource != NULL. * @uncompressed_resource: If this pointer is not NULL, it points to an * array of @original_size bytes that are * the uncompressed input resource. * @size: The size of the resource in the input file. * @original_size: The original (uncompressed) size of the resource. * @offset: The offset of the start of the resource in @in. Ignored * if uncompressed_resource != NULL. * @input_ctype: The compression type of the resource in @in. Ignored if * uncompressed_resource != NULL. * @out: The file stream to write the file resource to. * @output_type: The compression type to use when writing the resource to * @out. * @new_size_ret: A location into which the new compressed size of the file * resource in returned. */ static int recompress_resource(FILE *in, const u8 uncompressed_resource[], u64 size, u64 original_size, off_t offset, int input_ctype, FILE *out, int output_ctype, u64 *new_size_ret) { int ret; int (*compress)(const void *, uint, void *, uint *); if (output_ctype == WIM_COMPRESSION_TYPE_LZX) compress = lzx_compress; else compress = xpress_compress; u8 uncompressed_buf[WIM_CHUNK_SIZE]; u8 compressed_buf[WIM_CHUNK_SIZE - 1]; /* Determine how many compressed chunks the file needs to be divided * into. */ u64 num_chunks = (original_size + WIM_CHUNK_SIZE - 1) / WIM_CHUNK_SIZE; u64 num_chunk_entries = num_chunks - 1; /* Size of the chunk entries--- 8 bytes for files over 4GB, otherwise 4 * bytes */ uint chunk_entry_size = (original_size >= (u64)1 << 32) ? 8 : 4; /* Array in which to construct the chunk offset table. */ u64 chunk_offsets[num_chunk_entries]; /* Offset of the start of the chunk table in the output file. */ off_t chunk_tab_offset = ftello(out); /* Total size of the chunk table (as written to the file) */ u64 chunk_tab_size = chunk_entry_size * num_chunk_entries; /* Reserve space for the chunk table. */ if (fwrite(chunk_offsets, 1, chunk_tab_size, out) != chunk_tab_size) { ERROR("Failed to write chunk offset table: %m\n"); return WIMLIB_ERR_WRITE; } /* Read each chunk of the file, compress it, write it to the output * file, and update th chunk offset table. */ u64 cur_chunk_offset = 0; for (u64 i = 0; i < num_chunks; i++) { u64 uncompressed_offset = i * WIM_CHUNK_SIZE; u64 uncompressed_chunk_size = min(WIM_CHUNK_SIZE, original_size - uncompressed_offset); const u8 *uncompressed_p; if (uncompressed_resource != NULL) { uncompressed_p = uncompressed_resource + uncompressed_offset; } else { /* Read chunk i of the file into uncompressed_buf. */ ret = read_resource(in, size, original_size, offset, input_ctype, uncompressed_chunk_size, uncompressed_offset, uncompressed_buf); if (ret != 0) return ret; uncompressed_p = uncompressed_buf; } if (i != 0) chunk_offsets[i - 1] = cur_chunk_offset; uint compressed_len; ret = compress(uncompressed_p, uncompressed_chunk_size, compressed_buf, &compressed_len); /* if compress() returned nonzero, the compressed chunk would * have been at least as large as the uncompressed chunk. In * this situation, the WIM format requires that the uncompressed * chunk be written instead. */ const u8 *buf_to_write; uint len_to_write; if (ret == 0) { buf_to_write = compressed_buf; len_to_write = compressed_len; } else { buf_to_write = uncompressed_p; len_to_write = uncompressed_chunk_size; } if (fwrite(buf_to_write, 1, len_to_write, out) != len_to_write) { ERROR("Failed to write compressed file resource: %m\n"); return WIMLIB_ERR_WRITE; } cur_chunk_offset += len_to_write; } /* The chunk offset after the last chunk, plus the size of the chunk * table, gives the total compressed size of the resource. */ *new_size_ret = cur_chunk_offset + chunk_tab_size; /* Now that all entries of the chunk table are determined, rewind the * stream to where the chunk table was, and write it back out. */ if (fseeko(out, chunk_tab_offset, SEEK_SET) != 0) { ERROR("Failed to seek to beginning of chunk table: %m\n"); return WIMLIB_ERR_READ; } if (chunk_entry_size == 8) { array_to_le64(chunk_offsets, num_chunk_entries); if (fwrite(chunk_offsets, 1, chunk_tab_size, out) != chunk_tab_size) { ERROR("Failed to write chunk table: %m\n"); return WIMLIB_ERR_WRITE; } } else { u32 chunk_entries_small[num_chunk_entries]; for (u64 i = 0; i < num_chunk_entries; i++) chunk_entries_small[i] = to_le32(chunk_offsets[i]); if (fwrite(chunk_entries_small, 1, chunk_tab_size, out) != chunk_tab_size) { ERROR("Failed to write chunk table: %m\n"); return WIMLIB_ERR_WRITE; } } if (fseeko(out, 0, SEEK_END) != 0) { ERROR("Failed to seek to end of output file: %m\n"); return WIMLIB_ERR_WRITE; } return 0; } int write_resource_from_memory(const u8 resource[], int out_ctype, u64 resource_original_size, FILE *out, u64 *resource_size_ret) { if (out_ctype == WIM_COMPRESSION_TYPE_NONE) { if (fwrite(resource, 1, resource_original_size, out) != resource_original_size) { ERROR("Failed to write resource of length " "%"PRIu64": %m\n", resource_original_size); return WIMLIB_ERR_WRITE; } *resource_size_ret = resource_original_size; return 0; } else { return recompress_resource(NULL, resource, resource_original_size, resource_original_size, 0, 0, out, out_ctype, resource_size_ret); } } /* * Transfers a file resource from a FILE* opened for reading to a FILE* opened * for writing, possibly changing the compression type. * * @in: The FILE* that contains the file resource. * @size: The (compressed) size of the file resource. * @original_size: The uncompressed size of the file resource. * @offset: The offset of the file resource in the input file. * @input_ctype: The compression type of the file resource in the input * file. * @out: The FILE* for the output file. The file resource is * written at the current position of @out. * @output_ctype: The compression type to which the file resource will be * converted. * @output_res_entry: A pointer to a resource entry that, upon successful * return of this function, will have the size, * original size, offset, and flags fields filled * in for the file resource written to the output * file. */ static int transfer_file_resource(FILE *in, u64 size, u64 original_size, off_t offset, int input_ctype, FILE *out, int output_ctype, struct resource_entry *output_res_entry) { int ret; /* Handle zero-length files */ if (original_size == 0) { memset(output_res_entry, 0, sizeof(*output_res_entry)); return 0; } /* Get current offset in the output file. */ output_res_entry->offset = ftello(out); if (output_res_entry->offset == -1) { ERROR("Failed to get output position: %m\n"); return WIMLIB_ERR_WRITE; } if (output_ctype == input_ctype) { /* The same compression types; simply copy the resource. */ ret = copy_between_files(in, offset, out, size); if (ret != 0) return ret; output_res_entry->size = size; } else { /* Different compression types. */ if (output_ctype == WIM_COMPRESSION_TYPE_NONE) { /* Uncompress a compressed file resource */ ret = uncompress_resource(in, size, original_size, offset, input_ctype, out); if (ret != 0) return ret; output_res_entry->size = original_size; } else { u64 new_size; /* Compress an uncompressed file resource, or compress a * compressed file resource using a different * compression type (the latter is currently unsupported * since only LZX compression is supported. */ ret = recompress_resource(in, NULL, size, original_size, offset, input_ctype, out, output_ctype, &new_size); if (ret != 0) return ret; output_res_entry->size = new_size; } } output_res_entry->original_size = original_size; if (output_ctype == WIM_COMPRESSION_TYPE_NONE) output_res_entry->flags = 0; else output_res_entry->flags = WIM_RESHDR_FLAG_COMPRESSED; return 0; } /* * Writes a file resource to the output file. * * @dentry: The dentry for the file resource. * @wim_p: A pointer to the WIMStruct. The fields of interest to this * function are the input and output file streams and the lookup table. * @return zero on success, nonzero on failure. */ static int write_file_resource(struct dentry *dentry, void *wim_p) { WIMStruct *w; FILE *out; FILE *in; struct lookup_table_entry *lte; int in_wim_ctype; int out_wim_ctype; int input_res_ctype; struct resource_entry *input_res_entry; struct resource_entry *output_res_entry; u64 len; int ret; w = wim_p; out = w->out_fp; /* Directories don't need file resources. */ if (dentry_is_directory(dentry)) return 0; /* Get the lookup entry for the file resource. */ lte = wim_lookup_resource(w, dentry); if (!lte) return 0; /* No need to write file resources twice. (This indicates file * resources that are part of a hard link set.) */ if (++lte->out_refcnt != 1) return 0; out_wim_ctype = wimlib_get_compression_type(w); output_res_entry = <e->output_resource_entry; /* Figure out if we can read the resource from the WIM file, or * if we have to read it from the filesystem outside. */ if (lte->file_on_disk) { /* Read from disk (uncompressed) */ len = lte->resource_entry.original_size; in = fopen(lte->file_on_disk, "rb"); if (!in) { ERROR("Failed to open the file `%s': %m\n", lte->file_on_disk); return WIMLIB_ERR_OPEN; } if (w->verbose) puts(lte->file_on_disk); ret = transfer_file_resource(in, len, len, 0, WIM_COMPRESSION_TYPE_NONE, out, out_wim_ctype, output_res_entry); fclose(in); } else { /* Read from input WIM (possibly compressed) */ /* It may be a different WIM file, in the case of * exporting images from one WIM file to another */ if (lte->other_wim_fp) { /* Different WIM file. */ in = lte->other_wim_fp; in_wim_ctype = lte->other_wim_ctype; } else { /* Same WIM file. */ in = w->fp; in_wim_ctype = out_wim_ctype; } input_res_entry = <e->resource_entry; input_res_ctype = resource_compression_type( in_wim_ctype, input_res_entry->flags); ret = transfer_file_resource(in, input_res_entry->size, input_res_entry->original_size, input_res_entry->offset, input_res_ctype, out, out_wim_ctype, output_res_entry); } return ret; } /* Reopens the FILE* for a WIM read-write. */ static int reopen_rw(WIMStruct *w) { FILE *fp; if (fclose(w->fp) != 0) ERROR("Failed to close the file `%s': %m\n", w->filename); fp = fopen(w->filename, "r+b"); if (!fp) { ERROR("Failed to open `%s' for reading and writing: " "%m\n", w->filename); return WIMLIB_ERR_OPEN; } w->fp = fp; return 0; } /* * Writes a WIM file to the original file that it was read from, overwriting it. */ WIMLIBAPI int wimlib_overwrite(WIMStruct *w, int flags) { const char *wimfile_name; size_t wim_name_len; int ret; wimfile_name = w->filename; DEBUG("Replacing WIM file `%s'\n", wimfile_name); if (!wimfile_name) return WIMLIB_ERR_NO_FILENAME; /* Write the WIM to a temporary file. */ /* XXX should the temporary file be somewhere else? */ wim_name_len = strlen(wimfile_name); char tmpfile[wim_name_len + 10]; memcpy(tmpfile, wimfile_name, wim_name_len); randomize_char_array_with_alnum(tmpfile + wim_name_len, 9); tmpfile[wim_name_len + 9] = '\0'; ret = wimlib_write(w, tmpfile, WIM_ALL_IMAGES, flags); if (ret != 0) { ERROR("Failed to write the WIM file `%s'!\n", tmpfile); return ret; } DEBUG("Closing original WIM file.\n"); /* Close the original WIM file that was opened for reading. */ if (w->fp) { if (fclose(w->fp) != 0) { WARNING("Failed to close the file `%s'\n", wimfile_name); } w->fp = NULL; } DEBUG("Renaming `%s' to `%s'\n", tmpfile, wimfile_name); /* Rename the new file to the old file .*/ if (rename(tmpfile, wimfile_name) != 0) { ERROR("Failed to rename `%s' to `%s': %m\n", tmpfile, wimfile_name); /* Remove temporary file. */ if (unlink(tmpfile) != 0) ERROR("Failed to remove `%s': %m\n", tmpfile); return WIMLIB_ERR_RENAME; } return 0; } WIMLIBAPI int wimlib_overwrite_xml_and_header(WIMStruct *w, int flags) { int ret; FILE *fp; u8 *integrity_table = NULL; off_t xml_end; off_t xml_size; size_t bytes_written; DEBUG("Overwriting XML and header of `%s', flags = %d\n", w->filename, flags); if (!w->filename) return WIMLIB_ERR_NO_FILENAME; ret = reopen_rw(w); if (ret != 0) return ret; fp = w->fp; /* The old integrity table is still OK, as the SHA1 message digests in * the integrity table include neither the header nor the XML data. * Save it for later if it exists and an integrity table was required. * */ if (flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY && w->hdr.integrity.offset != 0) { DEBUG("Reading existing integrity table.\n"); integrity_table = MALLOC(w->hdr.integrity.size); if (!integrity_table) return WIMLIB_ERR_NOMEM; ret = read_uncompressed_resource(fp, w->hdr.integrity.offset, w->hdr.integrity.original_size, integrity_table); if (ret != 0) goto err; DEBUG("Done reading existing integrity table.\n"); } DEBUG("Overwriting XML data.\n"); /* Overwrite the XML data. */ if (fseeko(fp, w->hdr.xml_res_entry.offset, SEEK_SET) != 0) { ERROR("Failed to seek to byte %"PRIu64" for XML data: " "%m\n", w->hdr.xml_res_entry.offset); ret = WIMLIB_ERR_WRITE; goto err; } ret = write_xml_data(w->wim_info, WIM_ALL_IMAGES, fp); if (ret != 0) goto err; DEBUG("Updating XML resource entry.\n"); /* Update the XML resource entry in the WIM header. */ xml_end = ftello(fp); if (xml_end == -1) { ret = WIMLIB_ERR_WRITE; goto err; } xml_size = xml_end - w->hdr.xml_res_entry.offset; w->hdr.xml_res_entry.size = xml_size; w->hdr.xml_res_entry.original_size = xml_size; if (flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) { DEBUG("Writing integrity table.\n"); w->hdr.integrity.offset = xml_end; if (integrity_table) { /* The existing integrity table was saved. */ bytes_written = fwrite(integrity_table, 1, w->hdr.integrity.size, fp); if (bytes_written != w->hdr.integrity.size) { ERROR("Failed to write integrity table: %m\n"); ret = WIMLIB_ERR_WRITE; goto err; } FREE(integrity_table); } else { /* There was no existing integrity table, so a new one * must be calculated. */ ret = write_integrity_table(fp, WIM_HEADER_DISK_SIZE, w->hdr.lookup_table_res_entry.offset + w->hdr.lookup_table_res_entry.size, flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS); if (ret != 0) goto err; off_t integrity_size = ftello(fp) - xml_end; w->hdr.integrity.size = integrity_size; w->hdr.integrity.original_size = integrity_size; w->hdr.integrity.flags = 0; } } else { DEBUG("Truncating file to end of XML data.\n"); /* No integrity table to write. The file should be truncated * because it's possible that the old file was longer (due to it * including an integrity table, or due to its XML data being * longer) */ if (fflush(fp) != 0) { ERROR("Failed to flush stream for file `%s': %m\n", w->filename); return WIMLIB_ERR_WRITE; } if (ftruncate(fileno(fp), xml_end) != 0) { ERROR("Failed to truncate `%s' to %"PRIu64" " "bytes: %m\n", w->filename, xml_end); return WIMLIB_ERR_WRITE; } memset(&w->hdr.integrity, 0, sizeof(struct resource_entry)); } DEBUG("Overwriting header.\n"); /* Overwrite the header. */ if (fseeko(fp, 0, SEEK_SET) != 0) { ERROR("Failed to seek to beginning of `%s': %m\n", w->filename); return WIMLIB_ERR_WRITE; } ret = write_header(&w->hdr, fp); if (ret != 0) return ret;; DEBUG("Closing file.\n"); if (fclose(fp) != 0) { ERROR("Failed to close `%s': %m\n", w->filename); return WIMLIB_ERR_WRITE; } w->fp = NULL; DEBUG("Done.\n"); return 0; err: FREE(integrity_table); return ret; } /* Write the metadata resource for the current image. */ int write_metadata_resource(WIMStruct *w) { FILE *out; u8 *buf; u8 *p; int ret; off_t subdir_offset; struct dentry *root; struct lookup_table_entry *lte; struct resource_entry *res_entry; off_t metadata_offset; u64 metadata_original_size; u64 metadata_compressed_size; int metadata_ctype; u8 hash[WIM_HASH_SIZE]; DEBUG("Writing metadata resource for image %u\n", w->current_image); out = w->out_fp; root = wim_root_dentry(w); metadata_ctype = wimlib_get_compression_type(w); metadata_offset = ftello(out); if (metadata_offset == -1) return WIMLIB_ERR_WRITE; subdir_offset = 8 + root->length + 8; calculate_subdir_offsets(root, &subdir_offset); metadata_original_size = subdir_offset; buf = MALLOC(metadata_original_size); if (!buf) { ERROR("Failed to allocate %"PRIu64" bytes for " "metadata resource\n", metadata_original_size); return WIMLIB_ERR_NOMEM; } p = buf; #if 0 /* Write the security data. */ p = write_security_data(wim_security_data(w), p); #else p = put_u32(p, 8); /* Total length of security data. */ p = put_u32(p, 0); /* Number of security data entries. */ #endif DEBUG("Writing dentry tree.\n"); p = write_dentry_tree(root, p); /* Like file resources, the lookup table entry for a metadata resource * uses for the hash code a SHA1 message digest of its uncompressed * contents. */ sha1_buffer(buf, metadata_original_size, hash); ret = write_resource_from_memory(buf, metadata_ctype, metadata_original_size, out, &metadata_compressed_size); FREE(buf); if (ret != 0) return ret; /* Update the lookup table entry, including the hash and output resource * entry fields, for this image's metadata resource. */ lte = wim_metadata_lookup_table_entry(w); res_entry = <e->output_resource_entry; lte->out_refcnt++; if (memcmp(hash, lte->hash, WIM_HASH_SIZE) != 0) { lookup_table_unlink(w->lookup_table, lte); memcpy(lte->hash, hash, WIM_HASH_SIZE); lookup_table_insert(w->lookup_table, lte); } res_entry->original_size = metadata_original_size; res_entry->offset = metadata_offset; res_entry->size = metadata_compressed_size; res_entry->flags = WIM_RESHDR_FLAG_METADATA; if (metadata_ctype != WIM_COMPRESSION_TYPE_NONE) res_entry->flags |= WIM_RESHDR_FLAG_COMPRESSED; return 0; } /* Write the file resources for the current image. */ static int write_file_resources(WIMStruct *w) { DEBUG("Writing file resources for image %u\n", w->current_image); return for_dentry_in_tree(wim_root_dentry(w), write_file_resource, w); } /* Write lookup table, xml data, lookup table, and rewrite header * * write_lt is zero iff the lookup table is not to be written; i.e. it is * handled elsewhere. */ int finish_write(WIMStruct *w, int image, int flags, int write_lt) { off_t lookup_table_offset; off_t xml_data_offset; off_t lookup_table_size; off_t integrity_offset; off_t xml_data_size; off_t end_offset; off_t integrity_size; int ret; int i; struct wim_header hdr; FILE *out = w->out_fp; if (write_lt) { lookup_table_offset = ftello(out); if (lookup_table_offset == -1) return WIMLIB_ERR_WRITE; DEBUG("Writing lookup table.\n"); /* Write the lookup table. */ ret = write_lookup_table(w->lookup_table, out); if (ret != 0) return ret; } DEBUG("Writing XML data.\n"); xml_data_offset = ftello(out); if (xml_data_offset == -1) return WIMLIB_ERR_WRITE; /* @hdr will be the header for the new WIM. First copy all the data * from the header in the WIMStruct; then set all the fields that may * have changed, including the resource entries, boot index, and image * count. */ memcpy(&hdr, &w->hdr, sizeof(struct wim_header)); if (write_lt) { lookup_table_size = xml_data_offset - lookup_table_offset; hdr.lookup_table_res_entry.offset = lookup_table_offset; hdr.lookup_table_res_entry.size = lookup_table_size; } hdr.lookup_table_res_entry.original_size = hdr.lookup_table_res_entry.size; hdr.lookup_table_res_entry.flags = WIM_RESHDR_FLAG_METADATA; ret = write_xml_data(w->wim_info, image, out); if (ret != 0) return ret; integrity_offset = ftello(out); if (integrity_offset == -1) return WIMLIB_ERR_WRITE; xml_data_size = integrity_offset - xml_data_offset; hdr.xml_res_entry.offset = xml_data_offset; hdr.xml_res_entry.size = xml_data_size; hdr.xml_res_entry.original_size = xml_data_size; hdr.xml_res_entry.flags = 0; if (flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) { ret = write_integrity_table(out, WIM_HEADER_DISK_SIZE, xml_data_offset, flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS); if (ret != 0) return ret; end_offset = ftello(out); if (end_offset == -1) return WIMLIB_ERR_WRITE; integrity_size = end_offset - integrity_offset; hdr.integrity.offset = integrity_offset; hdr.integrity.size = integrity_size; hdr.integrity.original_size = integrity_size; } else { hdr.integrity.offset = 0; hdr.integrity.size = 0; hdr.integrity.original_size = 0; } hdr.integrity.flags = 0; DEBUG("Updating WIM header.\n"); /* * In the WIM header, there is room for the resource entry for a * metadata resource labeled as the "boot metadata". This entry should * be zeroed out if there is no bootable image (boot_idx 0). Otherwise, * it should be a copy of the resource entry for the image that is * marked as bootable. This is not well documented... */ if (hdr.boot_idx == 0 || !w->image_metadata || (image != WIM_ALL_IMAGES && image != hdr.boot_idx)) { memset(&hdr.boot_metadata_res_entry, 0, sizeof(struct resource_entry)); } else { memcpy(&hdr.boot_metadata_res_entry, &w->image_metadata[hdr.boot_idx - 1].lookup_table_entry-> output_resource_entry, sizeof(struct resource_entry)); } /* Set image count and boot index correctly for single image writes */ if (image != WIM_ALL_IMAGES) { hdr.image_count = 1; if (hdr.boot_idx == image) hdr.boot_idx = 1; else hdr.boot_idx = 0; } if (fseeko(out, 0, SEEK_SET) != 0) return WIMLIB_ERR_WRITE; return write_header(&hdr, out); } /* Open file stream and write dummy header for WIM. */ int begin_write(WIMStruct *w, const char *path, int flags) { const char *mode; DEBUG("Opening `%s' for new WIM\n", path); /* checking the integrity requires going back over the file to read it. * XXX * (It also would be possible to keep a running sha1sum as the file * as written-- this would be faster, but a bit more complicated) */ if (flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) mode = "w+b"; else mode = "wb"; w->out_fp = fopen(path, mode); if (!w->out_fp) { ERROR("Failed to open the file `%s' for writing!\n", path); return WIMLIB_ERR_OPEN; } /* Write dummy header. It will be overwritten later. */ return write_header(&w->hdr, w->out_fp); } /* Writes the WIM to a file. */ WIMLIBAPI int wimlib_write(WIMStruct *w, const char *path, int image, int flags) { int ret; if (image != WIM_ALL_IMAGES && (image < 1 || image > w->hdr.image_count)) return WIMLIB_ERR_INVALID_IMAGE; if (image == WIM_ALL_IMAGES) DEBUG("Writing all images to `%s'\n", path); else DEBUG("Writing image %d to `%s'\n", image, path); ret = begin_write(w, path, flags); if (ret != 0) goto done; for_lookup_table_entry(w->lookup_table, zero_out_refcnts, NULL); ret = for_image(w, image, write_file_resources); if (ret != 0) { ERROR("Failed to write file resources!\n"); goto done; } ret = for_image(w, image, write_metadata_resource); if (ret != 0) { ERROR("Failed to write image metadata!\n"); goto done; } ret = finish_write(w, image, flags, 1); done: DEBUG("Closing output file.\n"); if (w->out_fp != NULL) { if (fclose(w->out_fp) != 0) { ERROR("Failed to close the file `%s': %m\n", path); ret = WIMLIB_ERR_WRITE; } w->out_fp = NULL; } return ret; }