4 * Read, write, or create a WIM header.
8 * Copyright (C) 2012, 2013 Eric Biggers
10 * This file is part of wimlib, a library for working with WIM files.
12 * wimlib is free software; you can redistribute it and/or modify it under the
13 * terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 3 of the License, or (at your option)
17 * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
18 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
19 * A PARTICULAR PURPOSE. See the GNU General Public License for more
22 * You should have received a copy of the GNU General Public License
23 * along with wimlib; if not, see http://www.gnu.org/licenses/.
31 #include "wimlib/assert.h"
32 #include "wimlib/endianness.h"
33 #include "wimlib/error.h"
34 #include "wimlib/file_io.h"
35 #include "wimlib/header.h"
36 #include "wimlib/util.h"
37 #include "wimlib/wim.h"
49 * Reads the header from a WIM file.
52 * Name of the WIM file (for error/debug messages only), or NULL if reading
53 * directly from file descriptor.
55 * File descriptor, positioned at offset 0, to read the header from.
57 * Structure to read the header into.
60 * WIMLIB_ERR_SUCCESS (0)
61 * WIMLIB_ERR_IMAGE_COUNT
62 * WIMLIB_ERR_INVALID_CHUNK_SIZE
63 * WIMLIB_ERR_INVALID_PART_NUMBER
64 * WIMLIB_ERR_NOT_A_WIM_FILE
66 * WIMLIB_ERR_UNEXPECTED_END_OF_FILE
67 * WIMLIB_ERR_UNKNOWN_VERSION
70 read_wim_header(const tchar *filename, struct filedes *in_fd,
71 struct wim_header *hdr)
73 struct wim_header_disk disk_hdr _aligned_attribute(8);
77 wimlib_assert(in_fd->offset == 0);
80 pipe_str = alloca(40);
81 tsprintf(pipe_str, T("[fd %d]"), in_fd->fd);
85 BUILD_BUG_ON(sizeof(struct wim_header_disk) != WIM_HEADER_DISK_SIZE);
87 DEBUG("Reading WIM header from \"%"TS"\"", filename);
89 ret = full_read(in_fd, &disk_hdr, sizeof(disk_hdr));
93 if (disk_hdr.magic != WIM_MAGIC) {
94 if (disk_hdr.magic == PWM_MAGIC) {
95 /* Pipable WIM: Use header at end instead, unless
96 * actually reading from a pipe. */
97 if (!in_fd->is_pipe) {
98 lseek(in_fd->fd, -WIM_HEADER_DISK_SIZE, SEEK_END);
99 ret = full_read(in_fd, &disk_hdr, sizeof(disk_hdr));
104 ERROR("\"%"TS"\": Invalid magic characters in header", filename);
105 return WIMLIB_ERR_NOT_A_WIM_FILE;
108 hdr->magic = disk_hdr.magic;
110 if (le32_to_cpu(disk_hdr.hdr_size) != sizeof(struct wim_header_disk)) {
111 ERROR("\"%"TS"\": Header size is invalid (%u bytes)",
112 filename, le32_to_cpu(disk_hdr.hdr_size));
113 return WIMLIB_ERR_INVALID_HEADER;
116 if (le32_to_cpu(disk_hdr.wim_version) != WIM_VERSION) {
117 ERROR("\"%"TS"\": The WIM header says the WIM version is %u, "
118 "but wimlib only knows about version %u",
119 filename, le32_to_cpu(disk_hdr.wim_version), WIM_VERSION);
120 return WIMLIB_ERR_UNKNOWN_VERSION;
123 hdr->flags = le32_to_cpu(disk_hdr.wim_flags);
124 if (le32_to_cpu(disk_hdr.chunk_size) != WIM_CHUNK_SIZE &&
125 (hdr->flags & WIM_HDR_FLAG_COMPRESSION)) {
126 ERROR("\"%"TS"\": Unexpected chunk size of %u! Ask the author to "
127 "implement support for other chunk sizes.",
128 filename, le32_to_cpu(disk_hdr.chunk_size));
129 ERROR("(Or it might just be that the WIM header is invalid.)");
130 return WIMLIB_ERR_INVALID_CHUNK_SIZE;
133 memcpy(hdr->guid, disk_hdr.guid, WIM_GID_LEN);
135 hdr->part_number = le16_to_cpu(disk_hdr.part_number);
136 hdr->total_parts = le16_to_cpu(disk_hdr.total_parts);
138 if (hdr->total_parts == 0 || hdr->part_number == 0 ||
139 hdr->part_number > hdr->total_parts)
141 ERROR("\"%"TS"\": Invalid WIM part number: %hu of %hu",
142 filename, hdr->part_number, hdr->total_parts);
143 return WIMLIB_ERR_INVALID_PART_NUMBER;
146 hdr->image_count = le32_to_cpu(disk_hdr.image_count);
148 DEBUG("part_number = %u, total_parts = %u, image_count = %u",
149 hdr->part_number, hdr->total_parts, hdr->image_count);
151 if (hdr->image_count >= INT_MAX) {
152 ERROR("\"%"TS"\": Invalid image count (%u)",
153 filename, hdr->image_count);
154 return WIMLIB_ERR_IMAGE_COUNT;
157 get_resource_entry(&disk_hdr.lookup_table_res_entry, &hdr->lookup_table_res_entry);
158 get_resource_entry(&disk_hdr.xml_data_res_entry, &hdr->xml_res_entry);
159 get_resource_entry(&disk_hdr.boot_metadata_res_entry, &hdr->boot_metadata_res_entry);
160 hdr->boot_idx = le32_to_cpu(disk_hdr.boot_idx);
161 get_resource_entry(&disk_hdr.integrity_table_res_entry, &hdr->integrity);
165 ERROR_WITH_ERRNO("\"%"TS"\": Error reading header", filename);
169 /* Writes the header for a WIM file at the specified offset. If the offset
170 * specified is the current one, the position is advanced by the size of the
173 write_wim_header_at_offset(const struct wim_header *hdr, struct filedes *out_fd,
176 struct wim_header_disk disk_hdr _aligned_attribute(8);
179 DEBUG("Writing %sWIM header at offset %"PRIu64,
180 ((hdr->magic == PWM_MAGIC) ? "pipable " : ""),
183 disk_hdr.magic = hdr->magic;
184 disk_hdr.hdr_size = cpu_to_le32(sizeof(struct wim_header_disk));
185 disk_hdr.wim_version = cpu_to_le32(WIM_VERSION);
186 disk_hdr.wim_flags = cpu_to_le32(hdr->flags);
187 disk_hdr.chunk_size = cpu_to_le32((hdr->flags & WIM_HDR_FLAG_COMPRESSION) ?
189 memcpy(disk_hdr.guid, hdr->guid, WIM_GID_LEN);
191 disk_hdr.part_number = cpu_to_le16(hdr->part_number);
192 disk_hdr.total_parts = cpu_to_le16(hdr->total_parts);
193 disk_hdr.image_count = cpu_to_le32(hdr->image_count);
194 put_resource_entry(&hdr->lookup_table_res_entry, &disk_hdr.lookup_table_res_entry);
195 put_resource_entry(&hdr->xml_res_entry, &disk_hdr.xml_data_res_entry);
196 put_resource_entry(&hdr->boot_metadata_res_entry, &disk_hdr.boot_metadata_res_entry);
197 disk_hdr.boot_idx = cpu_to_le32(hdr->boot_idx);
198 put_resource_entry(&hdr->integrity, &disk_hdr.integrity_table_res_entry);
199 memset(disk_hdr.unused, 0, sizeof(disk_hdr.unused));
201 if (offset == out_fd->offset)
202 ret = full_write(out_fd, &disk_hdr, sizeof(disk_hdr));
204 ret = full_pwrite(out_fd, &disk_hdr, sizeof(disk_hdr), offset);
206 ERROR_WITH_ERRNO("Failed to write WIM header");
210 /* Writes the header for a WIM file at the output file descriptor's current
213 write_wim_header(const struct wim_header *hdr, struct filedes *out_fd)
215 return write_wim_header_at_offset(hdr, out_fd, out_fd->offset);
218 /* Update just the wim_flags field. */
220 write_wim_header_flags(u32 hdr_flags, struct filedes *out_fd)
222 le32 flags = cpu_to_le32(hdr_flags);
224 return full_pwrite(out_fd, &flags, sizeof(flags),
225 offsetof(struct wim_header_disk, wim_flags));
229 * Initializes the header for a WIM file.
232 init_wim_header(struct wim_header *hdr, int ctype)
234 memset(hdr, 0, sizeof(struct wim_header));
236 case WIMLIB_COMPRESSION_TYPE_NONE:
239 case WIMLIB_COMPRESSION_TYPE_LZX:
240 hdr->flags = WIM_HDR_FLAG_COMPRESSION |
241 WIM_HDR_FLAG_COMPRESS_LZX;
243 case WIMLIB_COMPRESSION_TYPE_XPRESS:
244 hdr->flags = WIM_HDR_FLAG_COMPRESSION |
245 WIM_HDR_FLAG_COMPRESS_XPRESS;
248 ERROR("Invalid compression type specified (%d)", ctype);
249 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
251 hdr->total_parts = 1;
252 hdr->part_number = 1;
253 randomize_byte_array(hdr->guid, sizeof(hdr->guid));
254 hdr->magic = WIM_MAGIC;
262 struct hdr_flag hdr_flags[] = {
263 {WIM_HDR_FLAG_RESERVED, "RESERVED"},
264 {WIM_HDR_FLAG_COMPRESSION, "COMPRESSION"},
265 {WIM_HDR_FLAG_READONLY, "READONLY"},
266 {WIM_HDR_FLAG_SPANNED, "SPANNED"},
267 {WIM_HDR_FLAG_RESOURCE_ONLY, "RESOURCE_ONLY"},
268 {WIM_HDR_FLAG_METADATA_ONLY, "METADATA_ONLY"},
269 {WIM_HDR_FLAG_WRITE_IN_PROGRESS,"WRITE_IN_PROGRESS"},
270 {WIM_HDR_FLAG_RP_FIX, "RP_FIX"},
271 {WIM_HDR_FLAG_COMPRESS_RESERVED,"COMPRESS_RESERVED"},
272 {WIM_HDR_FLAG_COMPRESS_LZX, "COMPRESS_LZX"},
273 {WIM_HDR_FLAG_COMPRESS_XPRESS, "COMPRESS_XPRESS"},
276 /* API function documented in wimlib.h */
278 wimlib_print_header(const WIMStruct *wim)
280 const struct wim_header *hdr = &wim->hdr;
282 tprintf(T("Magic Characters = MSWIM\\000\\000\\000\n"));
283 tprintf(T("Header Size = %u\n"), WIM_HEADER_DISK_SIZE);
284 tprintf(T("Version = 0x%x\n"), WIM_VERSION);
286 tprintf(T("Flags = 0x%x\n"), hdr->flags);
287 for (size_t i = 0; i < ARRAY_LEN(hdr_flags); i++)
288 if (hdr_flags[i].flag & hdr->flags)
289 tprintf(T(" WIM_HDR_FLAG_%s is set\n"), hdr_flags[i].name);
291 tprintf(T("Chunk Size = %u\n"), WIM_CHUNK_SIZE);
292 tfputs (T("GUID = "), stdout);
293 print_byte_field(hdr->guid, WIM_GID_LEN, stdout);
295 tprintf(T("Part Number = %hu\n"), wim->hdr.part_number);
296 tprintf(T("Total Parts = %hu\n"), wim->hdr.total_parts);
297 tprintf(T("Image Count = %u\n"), hdr->image_count);
298 tprintf(T("Lookup Table Size = %"PRIu64"\n"),
299 (u64)hdr->lookup_table_res_entry.size);
300 tprintf(T("Lookup Table Flags = 0x%hhx\n"),
301 (u8)hdr->lookup_table_res_entry.flags);
302 tprintf(T("Lookup Table Offset = %"PRIu64"\n"),
303 hdr->lookup_table_res_entry.offset);
304 tprintf(T("Lookup Table Original_size = %"PRIu64"\n"),
305 hdr->lookup_table_res_entry.original_size);
306 tprintf(T("XML Data Size = %"PRIu64"\n"),
307 (u64)hdr->xml_res_entry.size);
308 tprintf(T("XML Data Flags = 0x%hhx\n"),
309 (u8)hdr->xml_res_entry.flags);
310 tprintf(T("XML Data Offset = %"PRIu64"\n"),
311 hdr->xml_res_entry.offset);
312 tprintf(T("XML Data Original Size = %"PRIu64"\n"),
313 hdr->xml_res_entry.original_size);
314 tprintf(T("Boot Metadata Size = %"PRIu64"\n"),
315 (u64)hdr->boot_metadata_res_entry.size);
316 tprintf(T("Boot Metadata Flags = 0x%hhx\n"),
317 (u8)hdr->boot_metadata_res_entry.flags);
318 tprintf(T("Boot Metadata Offset = %"PRIu64"\n"),
319 hdr->boot_metadata_res_entry.offset);
320 tprintf(T("Boot Metadata Original Size = %"PRIu64"\n"),
321 hdr->boot_metadata_res_entry.original_size);
322 tprintf(T("Boot Index = %u\n"), hdr->boot_idx);
323 tprintf(T("Integrity Size = %"PRIu64"\n"),
324 (u64)hdr->integrity.size);
325 tprintf(T("Integrity Flags = 0x%hhx\n"),
326 (u8)hdr->integrity.flags);
327 tprintf(T("Integrity Offset = %"PRIu64"\n"),
328 hdr->integrity.offset);
329 tprintf(T("Integrity Original_size = %"PRIu64"\n"),
330 hdr->integrity.original_size);