/*
* resource.c
*
- * Read uncompressed and compressed metadata and file resources.
+ * Read uncompressed and compressed metadata and file resources from a WIM file.
*/
/*
- * Copyright (C) 2010 Carl Thijssen
- * Copyright (C) 2012 Eric Biggers
+ * Copyright (C) 2012, 2013 Eric Biggers
*
* This file is part of wimlib, a library for working with WIM files.
*
* wimlib 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.
+ * 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 Lesser General Public License for more
- * details.
+ * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
- * You should have received a copy of the GNU Lesser General Public License
- * along with wimlib; if not, see http://www.gnu.org/licenses/.
+ * You should have received a copy of the GNU General Public License along with
+ * wimlib; if not, see http://www.gnu.org/licenses/.
*/
#include "wimlib_internal.h"
+#include "dentry.h"
#include "lookup_table.h"
-#include "io.h"
+#include "buffer_io.h"
#include "lzx.h"
#include "xpress.h"
#include "sha1.h"
-#include "dentry.h"
-#include "config.h"
-#include <unistd.h>
+
#include <errno.h>
-#include <alloca.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#ifdef WITH_NTFS_3G
+#include <time.h>
+#include <ntfs-3g/attrib.h>
+#include <ntfs-3g/inode.h>
+#include <ntfs-3g/dir.h>
+#endif
-/*
+/*
* Reads all or part of a compressed resource into an in-memory buffer.
*
* @fp: The FILE* for the WIM file.
- * @resource_compressed_size: The compressed size of the resource.
+ * @resource_compressed_size: The compressed size of the resource.
* @resource_uncompressed_size: The uncompressed size of the resource.
* @resource_offset: The offset of the start of the resource from
* the start of the stream @fp.
- * @resource_ctype: The compression type of the resource.
+ * @resource_ctype: The compression type of the resource.
* @len: The number of bytes of uncompressed data to read from
* the resource.
* @offset: The offset of the bytes to read within the uncompressed
*
* Returns zero on success, nonzero on failure.
*/
-static int read_compressed_resource(FILE *fp, u64 resource_compressed_size,
- u64 resource_uncompressed_size,
- u64 resource_offset, int resource_ctype,
+static int read_compressed_resource(FILE *fp, u64 resource_compressed_size,
+ u64 resource_uncompressed_size,
+ u64 resource_offset, int resource_ctype,
u64 len, u64 offset, u8 contents_ret[])
{
if (len == 0)
return 0;
- int (*decompress)(const void *, uint, void *, uint);
+ int (*decompress)(const void *, unsigned, void *, unsigned);
/* Set the appropriate decompress function. */
- if (resource_ctype == WIM_COMPRESSION_TYPE_LZX)
+ if (resource_ctype == WIMLIB_COMPRESSION_TYPE_LZX)
decompress = lzx_decompress;
else
decompress = xpress_decompress;
* The chunk offsets are measured relative to the end of the chunk
* table. The first chunk is omitted from the table in the WIM file
* because its offset is implicitly given by the fact that it directly
- * follows the chunk table and therefore must have an offset of 0.
+ * follows the chunk table and therefore must have an offset of 0.
*/
/* Calculate how many chunks the resource conists of in its entirety. */
/* According to M$'s documentation, if the uncompressed size of
* the file is greater than 4 GB, the chunk entries are 8-byte
* integers. Otherwise, they are 4-byte integers. */
- u64 chunk_entry_size = (resource_uncompressed_size >= (u64)1 << 32) ?
+ u64 chunk_entry_size = (resource_uncompressed_size >= (u64)1 << 32) ?
8 : 4;
/* Size of the full chunk table in the WIM file. */
/* Number of entries we need to actually read from the chunk
* table (excludes the implicit first chunk). */
- u64 num_needed_chunk_entries = (start_chunk == 0) ?
+ u64 num_needed_chunk_entries = (start_chunk == 0) ?
num_needed_chunks - 1 : num_needed_chunks;
/* Skip over unneeded chunk table entries. */
- u64 file_offset_of_needed_chunk_entries = resource_offset +
+ u64 file_offset_of_needed_chunk_entries = resource_offset +
start_table_idx * chunk_entry_size;
if (fseeko(fp, file_offset_of_needed_chunk_entries, SEEK_SET) != 0) {
ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" to read "
if (chunk_entry_size == 4) {
u32 *entries = (u32*)chunk_tab_buf;
while (num_needed_chunk_entries--)
- *chunk_tab_p++ = to_le32(*entries++);
+ *chunk_tab_p++ = le32_to_cpu(*entries++);
} else {
u64 *entries = (u64*)chunk_tab_buf;
while (num_needed_chunk_entries--)
- *chunk_tab_p++ = to_le64(*entries++);
+ *chunk_tab_p++ = le64_to_cpu(*entries++);
}
/* Done with the chunk table now. We must now seek to the first chunk
* that is needed for the read. */
- u64 file_offset_of_first_needed_chunk = resource_offset +
+ u64 file_offset_of_first_needed_chunk = resource_offset +
chunk_table_size + chunk_offsets[0];
if (fseeko(fp, file_offset_of_first_needed_chunk, SEEK_SET) != 0) {
ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" to read "
/* Calculate the sizes of the compressed chunk and of the
* uncompressed chunk. */
- uint compressed_chunk_size, uncompressed_chunk_size;
+ unsigned compressed_chunk_size;
+ unsigned uncompressed_chunk_size;
if (i != num_chunks - 1) {
/* All the chunks except the last one in the resource
* expand to WIM_CHUNK_SIZE uncompressed, and the amount
* of compressed data for the chunk is given by the
* difference of offsets in the chunk offset table. */
- compressed_chunk_size = chunk_offsets[i + 1 - start_chunk] -
+ compressed_chunk_size = chunk_offsets[i + 1 - start_chunk] -
chunk_offsets[i - start_chunk];
uncompressed_chunk_size = WIM_CHUNK_SIZE;
} else {
* bytes in the file resource, and the last uncompressed
* chunk has size equal to however many bytes are left-
* that is, the remainder of the uncompressed size when
- * divided by WIM_CHUNK_SIZE.
+ * divided by WIM_CHUNK_SIZE.
*
* Note that the resource_compressed_size includes the
* chunk table, so the size of it must be subtracted. */
- compressed_chunk_size = resource_compressed_size -
+ compressed_chunk_size = resource_compressed_size -
chunk_table_size -
chunk_offsets[i - start_chunk];
- uncompressed_chunk_size = resource_uncompressed_size %
+ uncompressed_chunk_size = resource_uncompressed_size %
WIM_CHUNK_SIZE;
/* If the remainder is 0, the last chunk actually
end_offset = WIM_CHUNK_SIZE - 1;
u64 partial_chunk_size = end_offset + 1 - start_offset;
- bool is_partial_chunk = (partial_chunk_size !=
+ bool is_partial_chunk = (partial_chunk_size !=
uncompressed_chunk_size);
DEBUG2("start_offset = %u, end_offset = %u", start_offset,
return WIMLIB_ERR_READ;
}
}
- if (fread(out_p, 1, partial_chunk_size, fp) !=
+ if (fread(out_p, 1, partial_chunk_size, fp) !=
partial_chunk_size)
goto err;
} else {
int ret;
/* Read the compressed data into compressed_buf. */
- if (fread(compressed_buf, 1, compressed_chunk_size,
+ if (fread(compressed_buf, 1, compressed_chunk_size,
fp) != compressed_chunk_size)
goto err;
ret = decompress(compressed_buf,
compressed_chunk_size,
- uncompressed_buf,
+ uncompressed_buf,
uncompressed_chunk_size);
if (ret != 0)
return WIMLIB_ERR_DECOMPRESSION;
return WIMLIB_ERR_READ;
}
-/*
+/*
* Reads uncompressed data from an open file stream.
*/
int read_uncompressed_resource(FILE *fp, u64 offset, u64 len,
return 0;
}
-
-
-
/* Reads the contents of a struct resource_entry, as represented in the on-disk
* format, from the memory pointed to by @p, and fills in the fields of @entry.
* A pointer to the byte after the memory read at @p is returned. */
p = get_u8(p, &flags);
entry->size = size;
entry->flags = flags;
+
+ /* offset and original_size are truncated to 62 bits to avoid possible
+ * overflows, when converting to a signed 64-bit integer (off_t) or when
+ * adding size or original_size. This is okay since no one would ever
+ * actually have a WIM bigger than 4611686018427387903 bytes... */
p = get_u64(p, &entry->offset);
+ if (entry->offset & 0xc000000000000000ULL) {
+ WARNING("Truncating offset in resource entry");
+ entry->offset &= 0x3fffffffffffffffULL;
+ }
p = get_u64(p, &entry->original_size);
+ if (entry->original_size & 0xc000000000000000ULL) {
+ WARNING("Truncating original_size in resource entry");
+ entry->original_size &= 0x3fffffffffffffffULL;
+ }
return p;
}
return p;
}
-static int __read_wim_resource(const struct lookup_table_entry *lte,
- u8 buf[], size_t size, u64 offset, bool raw)
+#ifdef WITH_FUSE
+static FILE *wim_get_fp(WIMStruct *w)
+{
+ pthread_mutex_lock(&w->fp_tab_mutex);
+ FILE *fp;
+
+ wimlib_assert(w->filename != NULL);
+
+ for (size_t i = 0; i < w->num_allocated_fps; i++) {
+ if (w->fp_tab[i]) {
+ fp = w->fp_tab[i];
+ w->fp_tab[i] = NULL;
+ goto out;
+ }
+ }
+ DEBUG("Opening extra file descriptor to `%s'", w->filename);
+ fp = fopen(w->filename, "rb");
+ if (!fp)
+ ERROR_WITH_ERRNO("Failed to open `%s'", w->filename);
+out:
+ pthread_mutex_unlock(&w->fp_tab_mutex);
+ return fp;
+}
+
+static int wim_release_fp(WIMStruct *w, FILE *fp)
+{
+ int ret = 0;
+ FILE **fp_tab;
+
+ pthread_mutex_lock(&w->fp_tab_mutex);
+
+ for (size_t i = 0; i < w->num_allocated_fps; i++) {
+ if (w->fp_tab[i] == NULL) {
+ w->fp_tab[i] = fp;
+ goto out;
+ }
+ }
+
+ fp_tab = REALLOC(w->fp_tab, sizeof(FILE*) * (w->num_allocated_fps + 4));
+ if (!fp_tab) {
+ ret = WIMLIB_ERR_NOMEM;
+ goto out;
+ }
+ w->fp_tab = fp_tab;
+ memset(&w->fp_tab[w->num_allocated_fps], 0, 4 * sizeof(FILE*));
+ w->fp_tab[w->num_allocated_fps] = fp;
+ w->num_allocated_fps += 4;
+out:
+ pthread_mutex_unlock(&w->fp_tab_mutex);
+ return ret;
+}
+#endif
+
+/*
+ * Reads some data from the resource corresponding to a WIM lookup table entry.
+ *
+ * @lte: The WIM lookup table entry for the resource.
+ * @buf: Buffer into which to write the data.
+ * @size: Number of bytes to read.
+ * @offset: Offset at which to start reading the resource.
+ *
+ * Returns zero on success, nonzero on failure.
+ */
+int read_wim_resource(const struct wim_lookup_table_entry *lte, u8 buf[],
+ size_t size, u64 offset, int flags)
{
- wimlib_assert(offset + size <= wim_resource_size(lte));
int ctype;
- int ret;
+ int ret = 0;
FILE *fp;
+
+ /* We shouldn't be allowing read over-runs in any part of the library.
+ * */
+ if (flags & WIMLIB_RESOURCE_FLAG_RAW)
+ wimlib_assert(offset + size <= lte->resource_entry.size);
+ else
+ wimlib_assert(offset + size <= lte->resource_entry.original_size);
+
switch (lte->resource_location) {
case RESOURCE_IN_WIM:
- wimlib_assert(lte->wim);
- wimlib_assert(lte->wim->fp);
- ctype = wim_resource_compression_type(lte);
- if (ctype == WIM_COMPRESSION_TYPE_NONE &&
- lte->resource_entry.original_size !=
- lte->resource_entry.size) {
- ERROR("WIM resource at offset %"PRIu64", size %"PRIu64
- "has an original size of %"PRIu64", but is "
- "uncompressed",
- lte->resource_entry.offset,
- lte->resource_entry.size,
- lte->resource_entry.original_size);
- return WIMLIB_ERR_INVALID_RESOURCE_SIZE;
+ /* The resource is in a WIM file, and its WIMStruct is given by
+ * the lte->wim member. The resource may be either compressed
+ * or uncompressed. */
+ wimlib_assert(lte->wim != NULL);
+
+ #ifdef WITH_FUSE
+ if (flags & WIMLIB_RESOURCE_FLAG_MULTITHREADED) {
+ fp = wim_get_fp(lte->wim);
+ if (!fp)
+ return WIMLIB_ERR_OPEN;
+ } else
+ #endif
+ {
+ wimlib_assert(!(flags & WIMLIB_RESOURCE_FLAG_MULTITHREADED));
+ wimlib_assert(lte->wim->fp != NULL);
+ fp = lte->wim->fp;
}
- if (raw || ctype == WIM_COMPRESSION_TYPE_NONE)
- return read_uncompressed_resource(lte->wim->fp,
- offset, size, buf);
+
+ ctype = wim_resource_compression_type(lte);
+
+ wimlib_assert(ctype != WIMLIB_COMPRESSION_TYPE_NONE ||
+ (lte->resource_entry.original_size ==
+ lte->resource_entry.size));
+
+ if ((flags & WIMLIB_RESOURCE_FLAG_RAW)
+ || ctype == WIMLIB_COMPRESSION_TYPE_NONE)
+ ret = read_uncompressed_resource(fp,
+ lte->resource_entry.offset + offset,
+ size, buf);
else
- return read_compressed_resource(lte->wim->fp,
- lte->resource_entry.size,
- lte->resource_entry.original_size,
- lte->resource_entry.offset,
- ctype, size, offset, buf);
+ ret = read_compressed_resource(fp,
+ lte->resource_entry.size,
+ lte->resource_entry.original_size,
+ lte->resource_entry.offset,
+ ctype, size, offset, buf);
+ #ifdef WITH_FUSE
+ if (flags & WIMLIB_RESOURCE_FLAG_MULTITHREADED) {
+ int ret2 = wim_release_fp(lte->wim, fp);
+ if (ret == 0)
+ ret = ret2;
+ }
+ #endif
break;
case RESOURCE_IN_STAGING_FILE:
- wimlib_assert(lte->staging_file_name);
- wimlib_assert(0);
- break;
case RESOURCE_IN_FILE_ON_DISK:
- wimlib_assert(lte->file_on_disk);
+ /* The resource is in some file on the external filesystem and
+ * needs to be read uncompressed */
+ wimlib_assert(lte->file_on_disk != NULL);
+ BUILD_BUG_ON(<e->file_on_disk != <e->staging_file_name);
+ /* Use existing file pointer if available; otherwise open one
+ * temporarily */
if (lte->file_on_disk_fp) {
fp = lte->file_on_disk_fp;
} else {
if (!fp) {
ERROR_WITH_ERRNO("Failed to open the file "
"`%s'", lte->file_on_disk);
+ ret = WIMLIB_ERR_OPEN;
+ break;
}
}
- ret = read_uncompressed_resource(lte->file_on_disk_fp,
- offset, size, buf);
+ ret = read_uncompressed_resource(fp, offset, size, buf);
if (fp != lte->file_on_disk_fp)
fclose(fp);
- return ret;
break;
+#if defined(__CYGWIN__) || defined(__WIN32__)
+ case RESOURCE_WIN32:
+ wimlib_assert(lte->file_on_disk_fp != NULL);
+ ret = win32_read_file(lte->file_on_disk, lte->file_on_disk_fp,
+ offset, size, buf);
+ break;
+#endif
case RESOURCE_IN_ATTACHED_BUFFER:
- wimlib_assert(lte->attached_buffer);
+ /* The resource is directly attached uncompressed in an
+ * in-memory buffer. */
+ wimlib_assert(lte->attached_buffer != NULL);
memcpy(buf, lte->attached_buffer + offset, size);
- return 0;
break;
+#ifdef WITH_NTFS_3G
+ case RESOURCE_IN_NTFS_VOLUME:
+ wimlib_assert(lte->ntfs_loc != NULL);
+ wimlib_assert(lte->attr != NULL);
+ if (lte->ntfs_loc->is_reparse_point)
+ offset += 8;
+ if (ntfs_attr_pread(lte->attr, offset, size, buf) != size) {
+ ERROR_WITH_ERRNO("Error reading NTFS attribute "
+ "at `%s'",
+ lte->ntfs_loc->path_utf8);
+ ret = WIMLIB_ERR_NTFS_3G;
+ }
+ break;
+#endif
default:
- assert(0);
- }
-}
-
-int read_wim_resource(const struct lookup_table_entry *lte, u8 buf[],
- size_t size, u64 offset)
-{
- return __read_wim_resource(lte, buf, size, offset, false);
-}
-
-int read_full_wim_resource(const struct lookup_table_entry *lte, u8 buf[])
-{
- return __read_wim_resource(lte, buf, lte->resource_entry.original_size,
- 0, false);
-}
-
-struct chunk_table {
- off_t file_offset;
- u64 num_chunks;
- u64 original_resource_size;
- u64 bytes_per_chunk_entry;
- u64 table_disk_size;
- u64 cur_offset;
- u64 *cur_offset_p;
- u64 offsets[0];
-};
-
-static int
-begin_wim_resource_chunk_tab(const struct lookup_table_entry *lte,
- FILE *out_fp,
- struct chunk_table **chunk_tab_ret)
-{
- u64 size = wim_resource_size(lte);
- u64 num_chunks = (size + WIM_CHUNK_SIZE - 1) / WIM_CHUNK_SIZE;
- struct chunk_table *chunk_tab = MALLOC(sizeof(struct chunk_table) +
- num_chunks * sizeof(u64));
- int ret = 0;
-
- if (!chunk_tab) {
- ERROR("Failed to allocate chunk table for %"PRIu64" byte "
- "resource", size);
- ret = WIMLIB_ERR_NOMEM;
- goto out;
- }
- chunk_tab->file_offset = ftello(out_fp);
- if (chunk_tab->file_offset == -1) {
- ERROR_WITH_ERRNO("Failed to get file offset in output WIM");
- ret = WIMLIB_ERR_WRITE;
- goto out;
- }
- chunk_tab->num_chunks = num_chunks;
- chunk_tab->cur_offset_p = chunk_tab->offsets;
- chunk_tab->original_resource_size = lte->resource_entry.original_size;
- chunk_tab->bytes_per_chunk_entry =
- (lte->resource_entry.original_size >= (1ULL << 32))
- ? 8 : 4;
- chunk_tab->table_disk_size = chunk_tab->bytes_per_chunk_entry *
- (num_chunks - 1);
-
- if (fwrite(chunk_tab, 1, chunk_tab->table_disk_size, out_fp) !=
- chunk_tab->table_disk_size)
- {
- ERROR_WITH_ERRNO("Failed to write chunk table in compressed "
- "file resource");
- ret = WIMLIB_ERR_WRITE;
- goto out;
+ wimlib_assert(0);
+ ret = -1;
+ break;
}
-
- *chunk_tab_ret = chunk_tab;
-out:
return ret;
}
-static int compress_chunk(const u8 chunk[], unsigned chunk_sz,
- u8 compressed_chunk[],
- unsigned *compressed_chunk_len_ret,
- int ctype)
+/*
+ * Reads all the data from the resource corresponding to a WIM lookup table
+ * entry.
+ *
+ * @lte: The WIM lookup table entry for the resource.
+ * @buf: Buffer into which to write the data. It must be at least
+ * wim_resource_size(lte) bytes long.
+ *
+ * Returns 0 on success; nonzero on failure.
+ */
+int read_full_wim_resource(const struct wim_lookup_table_entry *lte, u8 buf[],
+ int flags)
{
- unsigned compressed_chunk_sz;
- int (*compress)(const void *, unsigned, void *, unsigned *);
- if (ctype == WIM_COMPRESSION_TYPE_LZX)
- compress = lzx_compress;
- else
- compress = xpress_compress;
- return (*compress)(chunk, chunk_sz, compressed_chunk,
- compressed_chunk_len_ret);
+ return read_wim_resource(lte, buf, wim_resource_size(lte), 0, flags);
}
-static int write_wim_resource_chunk(const u8 chunk[], unsigned chunk_size,
- FILE *out_fp, int out_ctype,
- struct chunk_table *chunk_tab)
-{
- const u8 *out_chunk;
- unsigned out_chunk_size;
-
- if (out_ctype == WIM_COMPRESSION_TYPE_NONE) {
- out_chunk = chunk;
- out_chunk_size = chunk_size;
- } else {
- u8 *compressed_chunk = alloca(chunk_size);
- int ret;
- unsigned compressed_chunk_len;
-
- wimlib_assert(chunk_tab != NULL);
-
- ret = compress_chunk(chunk, chunk_size, compressed_chunk,
- &out_chunk_size, out_ctype);
- if (ret > 0)
- return ret;
- else if (ret < 0) {
- out_chunk = chunk;
- out_chunk_size = chunk_size;
- } else {
- out_chunk = compressed_chunk;
- }
- *chunk_tab->cur_offset_p++ = chunk_tab->cur_offset;
- chunk_tab->cur_offset += out_chunk_size;
- }
-
- if (fwrite(out_chunk, 1, out_chunk_size, out_fp) != out_chunk_size) {
- ERROR_WITH_ERRNO("Failed to write WIM resource chunk");
- return WIMLIB_ERR_WRITE;
- }
- return 0;
-}
-
-static int
-finish_wim_resource_chunk_tab(const struct chunk_table *chunk_tab,
- FILE *out_fp)
-{
- if (fseeko(out_fp, chunk_tab->file_offset, SEEK_SET) != 0) {
- ERROR_WITH_ERRNO("Failed to seet to byte "PRIu64" of output "
- "WIM file", chunk_tab->file_offset);
- return WIMLIB_ERR_WRITE;
- }
-
- if (chunk_tab->bytes_per_chunk_entry == 8) {
- array_to_le64(chunk_tab->offsets, chunk_tab->num_chunks - 1);
- } else {
- for (u64 i = 0; i < chunk_tab->num_chunks - 1; i++)
- ((u32*)chunk_tab->offsets)[i] =
- to_le32(chunk_tab->offsets[i]);
- }
- if (fwrite(chunk_tab->offsets, 1, chunk_tab->table_disk_size, out_fp) !=
- chunk_tab->table_disk_size)
- {
- ERROR_WITH_ERRNO("Failed to write chunk table in compressed "
- "file resource");
- return WIMLIB_ERR_WRITE;
- }
- if (fseeko(out_fp, chunk_tab->file_offset, SEEK_SET) != 0) {
- ERROR_WITH_ERRNO("Failed to seet to byte "PRIu64" of output "
- "WIM file", chunk_tab->file_offset);
- return WIMLIB_ERR_WRITE;
- }
- return 0;
-}
-
-static int write_wim_resource(const struct lookup_table_entry *lte,
- FILE *out_fp, int out_ctype)
+/* Extracts the first @size bytes of a WIM resource to somewhere. In the
+ * process, the SHA1 message digest of the resource is checked if the full
+ * resource is being extracted.
+ *
+ * @extract_chunk is a function that is called to extract each chunk of the
+ * resource. */
+int extract_wim_resource(const struct wim_lookup_table_entry *lte,
+ u64 size,
+ extract_chunk_func_t extract_chunk,
+ void *extract_chunk_arg)
{
- u64 bytes_remaining = wim_resource_size(lte);
- char buf[min(WIM_CHUNK_SIZE, bytes_remaining)];
+ u64 bytes_remaining = size;
+ u8 buf[min(WIM_CHUNK_SIZE, bytes_remaining)];
u64 offset = 0;
int ret = 0;
- bool raw = wim_resource_compression_type(lte) == out_ctype;
- struct chunk_table *chunk_tab = NULL;
+ u8 hash[SHA1_HASH_SIZE];
+ bool check_hash = (size == wim_resource_size(lte));
+ SHA_CTX ctx;
- if (raw)
- out_ctype = WIM_COMPRESSION_TYPE_NONE;
-
- if (out_ctype != WIM_COMPRESSION_TYPE_NONE) {
- ret = begin_wim_resource_chunk_tab(lte, out_fp,
- &chunk_tab);
- if (ret != 0)
- return 0;
- }
+ if (check_hash)
+ sha1_init(&ctx);
while (bytes_remaining) {
- u64 to_read = min(bytes_remaining, WIM_CHUNK_SIZE);
- ret = __read_wim_resource(lte, buf, to_read, offset, raw);
- if (ret != 0)
- break;
- ret = write_wim_resource_chunk(buf, to_read, out_fp,
- out_ctype, chunk_tab);
+ u64 to_read = min(bytes_remaining, sizeof(buf));
+ ret = read_wim_resource(lte, buf, to_read, offset, 0);
if (ret != 0)
- break;
+ return ret;
+ if (check_hash)
+ sha1_update(&ctx, buf, to_read);
+ ret = extract_chunk(buf, to_read, offset, extract_chunk_arg);
+ if (ret != 0) {
+ ERROR_WITH_ERRNO("Error extracting WIM resource");
+ return ret;
+ }
bytes_remaining -= to_read;
offset += to_read;
}
- if (out_ctype != WIM_COMPRESSION_TYPE_NONE)
- ret = finish_wim_resource_chunk_tab(chunk_tab, out_fp);
- return ret;
-}
-
-static int write_wim_resource_from_buffer(const u8 *buf, u64 buf_size,
- FILE *out_fp, int out_ctype)
-{
- struct lookup_table_entry lte;
- lte.resource_entry.flags = 0;
- lte.resource_entry.original_size = buf_size;
- lte.resource_entry.size = buf_size;
- lte.resource_entry.offset = 0;
- lte.resource_location = RESOURCE_IN_ATTACHED_BUFFER;
- lte.attached_buffer = (u8*)buf;
- return write_wim_resource(<e, out_fp, out_ctype);
+ if (check_hash) {
+ sha1_final(hash, &ctx);
+ if (!hashes_equal(hash, lte->hash)) {
+ #ifdef ENABLE_ERROR_MESSAGES
+ ERROR("Invalid checksum on the following WIM resource:");
+ print_lookup_table_entry(lte, stderr);
+ #endif
+ return WIMLIB_ERR_INVALID_RESOURCE_HASH;
+ }
+ }
+ return 0;
}
-/*
- * Extracts the first @size bytes of the resource specified by @lte to the open
- * file @fd. Returns nonzero on error.
- */
-int extract_wim_resource_to_fd(const struct lookup_table_entry *lte, int fd,
- u64 size)
+/* Write @n bytes from @buf to the file descriptor @fd, retrying on internupt
+ * and on short writes.
+ *
+ * Returns short count and set errno on failure. */
+static ssize_t full_write(int fd, const void *buf, size_t n)
{
- u64 bytes_remaining = size;
- char buf[min(WIM_CHUNK_SIZE, bytes_remaining)];
- u64 offset = 0;
- int ret = 0;
-
- while (bytes_remaining) {
- u64 to_read = min(bytes_remaining, WIM_CHUNK_SIZE);
- ret = read_wim_resource(lte, buf, to_read, offset);
- if (ret != 0)
- break;
- if (full_write(fd, buf, to_read) < 0) {
- ERROR_WITH_ERRNO("Error extracting WIM resource");
- return WIMLIB_ERR_WRITE;
+ const char *p = buf;
+ ssize_t ret;
+ ssize_t total = 0;
+
+ while (total != n) {
+ ret = write(fd, p, n);
+ if (ret < 0) {
+ if (errno == EINTR)
+ continue;
+ else
+ break;
}
- bytes_remaining -= to_read;
- offset += to_read;
+ total += ret;
+ p += ret;
}
- return 0;
+ return total;
}
-int extract_full_wim_resource_to_fd(const struct lookup_table_entry *lte, int fd)
+int extract_wim_chunk_to_fd(const u8 *buf, size_t len, u64 offset, void *arg)
{
- return extract_wim_resource_to_fd(lte, fd,
- lte->resource_entry.original_size);
+ int fd = *(int*)arg;
+ ssize_t ret = full_write(fd, buf, len);
+ if (ret < len) {
+ ERROR_WITH_ERRNO("Error writing to file descriptor");
+ return WIMLIB_ERR_WRITE;
+ } else {
+ return 0;
+ }
}
-/*
+/*
* Copies the file resource specified by the lookup table entry @lte from the
- * input WIM, pointed to by the fp field of the WIMStruct, to the output WIM,
- * pointed to by the out_fp field of the WIMStruct.
+ * input WIM to the output WIM that has its FILE * given by
+ * ((WIMStruct*)wim)->out_fp.
*
* The output_resource_entry, out_refcnt, and part_number fields of @lte are
* updated.
*
- * Metadata resources are not copied (they are handled elsewhere for joining and
- * splitting).
+ * (This function is confusing and should be refactored somehow.)
*/
-int copy_resource(struct lookup_table_entry *lte, void *wim)
+int copy_resource(struct wim_lookup_table_entry *lte, void *wim)
{
WIMStruct *w = wim;
int ret;
- off_t new_offset;
if ((lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) &&
!w->write_metadata)
return 0;
- new_offset = ftello(w->out_fp);
- if (new_offset == -1) {
- ERROR_WITH_ERRNO("Could not get offset in output WIM");
- return WIMLIB_ERR_WRITE;
- }
-
-
ret = write_wim_resource(lte, w->out_fp,
- wimlib_get_compression_type((WIMStruct*)w));
+ wim_resource_compression_type(lte),
+ <e->output_resource_entry, 0);
if (ret != 0)
return ret;
-
- memcpy(<e->output_resource_entry, <e->resource_entry,
- sizeof(struct resource_entry));
-
- lte->output_resource_entry.offset = new_offset;
lte->out_refcnt = lte->refcnt;
lte->part_number = w->hdr.part_number;
return 0;
}
-
-/*
- * Writes a dentry's resources, including the main file resource as well as all
- * alternate data streams, to the output file.
- *
- * @dentry: The dentry for the file.
- * @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.
- */
-int write_dentry_resources(struct dentry *dentry, void *wim_p)
-{
- WIMStruct *w = wim_p;
- int ret = 0;
- struct lookup_table_entry *lte;
- int ctype = wimlib_get_compression_type(w);
-
- for (unsigned i = 0; i <= dentry->num_ads; i++) {
- lte = dentry_stream_lte(dentry, i, w->lookup_table);
- if (lte && ++lte->out_refcnt == 1) {
- ret = write_wim_resource(lte, w->out_fp, ctype);
- if (ret != 0)
- break;
- }
- }
- return ret;
-}
-
-/*
- * Reads the metadata metadata resource from the WIM file. The metadata
- * resource consists of the security data, followed by the directory entry for
- * the root directory, followed by all the other directory entries in the
- * filesystem. The subdir_offset field of each directory entry gives the start
- * of its child entries from the beginning of the metadata resource. An
- * end-of-directory is signaled by a directory entry of length '0', really of
- * length 8, because that's how long the 'length' field is.
- *
- * @fp: The FILE* for the input WIM file.
- * @wim_ctype: The compression type of the WIM file.
- * @imd: Pointer to the image metadata structure. Its
- * `lookup_table_entry' member specifies the lookup table entry for
- * the metadata resource. The rest of the image metadata entry
- * will be filled in by this function.
- *
- * @return: Zero on success, nonzero on failure.
- */
-int read_metadata_resource(FILE *fp, int wim_ctype, struct image_metadata *imd)
-{
- u8 *buf;
- int ctype;
- u32 dentry_offset;
- int ret;
- struct dentry *dentry;
- struct wim_security_data *sd;
- struct link_group_table *lgt;
- const struct lookup_table_entry *metadata_lte;
- const struct resource_entry *res_entry;
-
- metadata_lte = imd->metadata_lte;
- res_entry = &metadata_lte->resource_entry;
-
- DEBUG("Reading metadata resource: length = %"PRIu64", "
- "offset = %"PRIu64"",
- res_entry->original_size, res_entry->offset);
-
- if (res_entry->original_size < 8) {
- ERROR("Expected at least 8 bytes for the metadata resource");
- return WIMLIB_ERR_INVALID_RESOURCE_SIZE;
- }
-
- /* Allocate memory for the uncompressed metadata resource. */
- buf = MALLOC(res_entry->original_size);
-
- if (!buf) {
- ERROR("Failed to allocate %"PRIu64" bytes for uncompressed "
- "metadata resource", res_entry->original_size);
- return WIMLIB_ERR_NOMEM;
- }
-
- /* Determine the compression type of the metadata resource. */
-
- /* Read the metadata resource into memory. (It may be compressed.) */
- ret = read_full_wim_resource(metadata_lte, buf);
- if (ret != 0)
- goto out_free_buf;
-
- DEBUG("Finished reading metadata resource into memory.");
-
- /* The root directory entry starts after security data, on an 8-byte
- * aligned address.
- *
- * The security data starts with a 4-byte integer giving its total
- * length. */
-
- /* Read the security data into a wim_security_data structure. */
- ret = read_security_data(buf, res_entry->original_size, &sd);
- if (ret != 0)
- goto out_free_buf;
-
- dentry = MALLOC(sizeof(struct dentry));
- if (!dentry) {
- ERROR("Failed to allocate %zu bytes for root dentry",
- sizeof(struct dentry));
- ret = WIMLIB_ERR_NOMEM;
- goto out_free_security_data;
- }
-
- get_u32(buf, &dentry_offset);
- if (dentry_offset == 0)
- dentry_offset = 8;
- dentry_offset = (dentry_offset + 7) & ~7;
-
- ret = read_dentry(buf, res_entry->original_size, dentry_offset, dentry);
- /* This is the root dentry, so set its pointers correctly. */
- dentry->parent = dentry;
- dentry->next = dentry;
- dentry->prev = dentry;
- if (ret != 0)
- goto out_free_dentry_tree;
-
- DEBUG("Reading dentry tree");
- /* Now read the entire directory entry tree. */
- ret = read_dentry_tree(buf, res_entry->original_size, dentry);
- if (ret != 0)
- goto out_free_dentry_tree;
-
- DEBUG("Calculating dentry full paths");
- /* Calculate the full paths in the dentry tree. */
- ret = for_dentry_in_tree(dentry, calculate_dentry_full_path, NULL);
- if (ret != 0)
- goto out_free_dentry_tree;
-
- DEBUG("Building link group table");
- /* Build hash table that maps hard link group IDs to dentry sets */
- lgt = new_link_group_table(9001);
- if (!lgt)
- goto out_free_dentry_tree;
- ret = for_dentry_in_tree(dentry, link_group_table_insert, lgt);
- if (ret != 0)
- goto out_free_lgt;
-
- DEBUG("Freeing duplicate ADS entries in link group table");
- ret = link_groups_free_duplicate_data(lgt);
- if (ret != 0)
- goto out_free_lgt;
- DEBUG("Done reading image metadata");
-
- imd->lgt = lgt;
- imd->security_data = sd;
- imd->root_dentry = dentry;
- goto out_free_buf;
-out_free_lgt:
- free_link_group_table(lgt);
-out_free_dentry_tree:
- free_dentry_tree(dentry, NULL);
-out_free_security_data:
- free_security_data(sd);
-out_free_buf:
- FREE(buf);
- return ret;
-}
-
-/* Write the metadata resource for the current image. */
-int write_metadata_resource(WIMStruct *w)
-{
- FILE *out;
- u8 *buf;
- u8 *p;
- int ret;
- u64 subdir_offset;
- struct dentry *root;
- struct lookup_table_entry *lte;
- off_t metadata_offset;
- u64 metadata_original_size;
- u64 metadata_compressed_size;
- int metadata_ctype;
- u8 hash[SHA1_HASH_SIZE];
-
- DEBUG("Writing metadata resource for image %d", 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;
-
- struct wim_security_data *sd = wim_security_data(w);
- if (sd)
- subdir_offset = sd->total_length + root->length + 8;
- else
- 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", metadata_original_size);
- return WIMLIB_ERR_NOMEM;
- }
-
- p = write_security_data(sd, buf);
-
- DEBUG("Writing dentry tree.");
- 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_wim_resource_from_buffer(buf, metadata_original_size,
- out, metadata_ctype);
- FREE(buf);
- if (ret != 0)
- return ret;
-
- DEBUG("Updating metadata lookup table entry (size %zu)",
- metadata_original_size);
-
- /* 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);
- lte->out_refcnt++;
- if (!hashes_equal(hash, lte->hash)) {
- lookup_table_unlink(w->lookup_table, lte);
- copy_hash(lte->hash, hash);
- lookup_table_insert(w->lookup_table, lte);
- }
- lte->output_resource_entry.original_size = metadata_original_size;
- lte->output_resource_entry.offset = metadata_offset;
- lte->output_resource_entry.size = metadata_compressed_size;
- lte->output_resource_entry.flags = WIM_RESHDR_FLAG_METADATA;
- if (metadata_ctype != WIM_COMPRESSION_TYPE_NONE)
- lte->output_resource_entry.flags |= WIM_RESHDR_FLAG_COMPRESSED;
- return 0;
-}
git://wimlib.net / wimlib / blobdiff