* resource.c
*
* Read uncompressed and compressed metadata and file resources.
- *
- * Copyright (C) 2010 Carl Thijssen
+ */
+
+/*
* Copyright (C) 2012 Eric Biggers
*
- * wimlib - Library for working with WIM files
+ * This file is part of wimlib, a 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.
+ * 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.
*
- * 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.
+ * 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 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
+ * You should have received a copy of the GNU General Public License along with
+ * wimlib; if not, see http://www.gnu.org/licenses/.
*/
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdarg.h>
+
+#ifdef WITH_NTFS_3G
+#include <ntfs-3g/attrib.h>
+#include <ntfs-3g/inode.h>
+#include <ntfs-3g/dir.h>
+#endif
+
#include "wimlib_internal.h"
+#include "lookup_table.h"
#include "io.h"
#include "lzx.h"
#include "xpress.h"
+#include "sha1.h"
#include "dentry.h"
#include <unistd.h>
#include <errno.h>
+#ifdef HAVE_ALLOCA_H
+#include <alloca.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[])
{
- DEBUG2("comp size = %"PRIu64", "
- "uncomp size = %"PRIu64", "
- "res offset = %"PRIu64"\n",
- resource_compressed_size,
- resource_uncompressed_size,
- resource_offset);
- DEBUG2("resource_ctype = %s, len = %"PRIu64", offset = %"PRIu64"\n",
- wimlib_get_compression_type_string(resource_ctype),
- len, offset);
+ DEBUG2("comp size = %"PRIu64", uncomp size = %"PRIu64", "
+ "res offset = %"PRIu64"",
+ resource_compressed_size,
+ resource_uncompressed_size,
+ resource_offset);
+ DEBUG2("resource_ctype = %s, len = %"PRIu64", offset = %"PRIu64"",
+ wimlib_get_compression_type_string(resource_ctype), len, offset);
/* Trivial case */
if (len == 0)
return 0;
* 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("Failed to seek to byte %"PRIu64" "
- "to read chunk table of compressed "
- "resource: %m\n",
- file_offset_of_needed_chunk_entries);
+ ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" to read "
+ "chunk table of compressed resource",
+ file_offset_of_needed_chunk_entries);
return WIMLIB_ERR_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("Failed to seek to byte %"PRIu64" "
- "to read first chunk of compressed "
- "resource: %m\n",
- file_offset_of_first_needed_chunk);
+ ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" to read "
+ "first chunk of compressed resource",
+ file_offset_of_first_needed_chunk);
return WIMLIB_ERR_READ;
}
/* Decompress all the chunks. */
for (u64 i = start_chunk; i <= end_chunk; i++) {
- DEBUG2("Chunk %"PRIu64" (start %"PRIu64", end %"PRIu64")\n",
- i, start_chunk, end_chunk);
+ DEBUG2("Chunk %"PRIu64" (start %"PRIu64", end %"PRIu64").",
+ i, start_chunk, end_chunk);
/* Calculate the sizes of the compressed chunk and of the
* uncompressed chunk. */
* 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
uncompressed_chunk_size = WIM_CHUNK_SIZE;
}
- DEBUG2("compressed_chunk_size = %u, uncompressed_chunk_size = %u\n",
- compressed_chunk_size, uncompressed_chunk_size);
+ DEBUG2("compressed_chunk_size = %u, "
+ "uncompressed_chunk_size = %u",
+ compressed_chunk_size, uncompressed_chunk_size);
/* Figure out how much of this chunk we actually need to read */
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\n", start_offset,
+ DEBUG2("start_offset = %u, end_offset = %u", start_offset,
end_offset);
- DEBUG2("partial_chunk_size = %u\n", partial_chunk_size);
+ DEBUG2("partial_chunk_size = %u", partial_chunk_size);
/* This is undocumented, but chunks can be uncompressed. This
* appears to always be the case when the compressed chunk size
if (start_offset != 0) {
if (fseeko(fp, start_offset, SEEK_CUR) != 0) {
- ERROR("Uncompressed partial chunk "
- "fseek() error: %m\n");
+ ERROR_WITH_ERRNO("Uncompressed partial "
+ "chunk fseek() error");
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;
memcpy(out_p, uncompressed_buf + start_offset,
partial_chunk_size);
} else {
- DEBUG2("out_p = %p\n");
ret = decompress(compressed_buf,
compressed_chunk_size,
out_p,
err:
if (feof(fp))
- ERROR("Unexpected EOF in compressed file resource\n");
+ ERROR("Unexpected EOF in compressed file resource");
else
- ERROR("Error reading compressed file resource: %m\n");
+ ERROR_WITH_ERRNO("Error reading compressed file resource");
return WIMLIB_ERR_READ;
}
-/*
+/*
* Reads uncompressed data from an open file stream.
*/
-int read_uncompressed_resource(FILE *fp, u64 offset, u64 len,
- u8 contents_ret[])
+int read_uncompressed_resource(FILE *fp, u64 offset, u64 len,
+ u8 contents_ret[])
{
if (fseeko(fp, offset, SEEK_SET) != 0) {
ERROR("Failed to seek to byte %"PRIu64" of input file "
- "to read uncompressed resource "
- "(len = %"PRIu64")!\n", offset, len);
+ "to read uncompressed resource (len = %"PRIu64")",
+ offset, len);
return WIMLIB_ERR_READ;
}
if (fread(contents_ret, 1, len, fp) != len) {
if (feof(fp)) {
- ERROR("Unexpected EOF in uncompressed file resource!\n");
+ ERROR("Unexpected EOF in uncompressed file resource");
} else {
ERROR("Failed to read %"PRIu64" bytes from "
- "uncompressed resource at offset "
- "%"PRIu64"\n", len, offset);
+ "uncompressed resource at offset %"PRIu64,
+ len, offset);
}
return WIMLIB_ERR_READ;
}
return 0;
}
-/*
- * Reads a WIM resource.
+
+
+
+/* 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. */
+const u8 *get_resource_entry(const u8 *p, struct resource_entry *entry)
+{
+ u64 size;
+ u8 flags;
+
+ p = get_u56(p, &size);
+ 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;
+}
+
+/* Copies the struct resource_entry @entry to the memory pointed to by @p in the
+ * on-disk format. A pointer to the byte after the memory written at @p is
+ * returned. */
+u8 *put_resource_entry(u8 *p, const struct resource_entry *entry)
+{
+ p = put_u56(p, entry->size);
+ p = put_u8(p, entry->flags);
+ p = put_u64(p, entry->offset);
+ p = put_u64(p, entry->original_size);
+ return p;
+}
+
+/*
+ * Reads some data from the resource corresponding to a WIM lookup table entry.
*
- * @fp: The FILE* for the WIM file.
- * @resource_size: The compressed size of the resource.
- * @resource_original_size: The uncompressed size of the resource.
- * @resource_offset: The offset of the resource in the stream @fp.
- * @resource_ctype: The compression type of the resource.
- * (WIM_COMPRESSION_TYPE_*)
- * @len: How many bytes of the resource should be read.
- * @offset: The offset within the resource at which the read
- * will occur.
+ * @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.
+ * @raw: If %true, compressed data is read literally rather than being
+ * decompressed first.
*
- * To read the whole file resource, specify offset =
- * 0 and len = resource_original_size, or call
- * read_full_resource().
+ * Returns zero on success, nonzero on failure.
+ */
+int read_wim_resource(const struct lookup_table_entry *lte, u8 buf[],
+ size_t size, u64 offset, bool raw)
+{
+ int ctype;
+ int ret = 0;
+ FILE *fp;
+
+ /* We shouldn't be allowing read over-runs in any part of the library.
+ * */
+ if (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:
+ /* 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);
+ wimlib_assert(lte->wim->fp != NULL);
+ ctype = wim_resource_compression_type(lte);
+
+ wimlib_assert(ctype != WIM_COMPRESSION_TYPE_NONE ||
+ (lte->resource_entry.original_size ==
+ lte->resource_entry.size));
+
+ if (raw || ctype == WIM_COMPRESSION_TYPE_NONE)
+ ret = read_uncompressed_resource(lte->wim->fp,
+ lte->resource_entry.offset + offset,
+ size, buf);
+ else
+ ret = read_compressed_resource(lte->wim->fp,
+ lte->resource_entry.size,
+ lte->resource_entry.original_size,
+ lte->resource_entry.offset,
+ ctype, size, offset, buf);
+ break;
+ case RESOURCE_IN_STAGING_FILE:
+ case RESOURCE_IN_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);
+ wimlib_assert(<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 {
+ fp = fopen(lte->file_on_disk, "rb");
+ if (!fp) {
+ ERROR_WITH_ERRNO("Failed to open the file "
+ "`%s'", lte->file_on_disk);
+ ret = WIMLIB_ERR_OPEN;
+ break;
+ }
+ }
+ ret = read_uncompressed_resource(fp, offset, size, buf);
+ if (fp != lte->file_on_disk_fp)
+ fclose(fp);
+ break;
+ case RESOURCE_IN_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);
+ break;
+#ifdef WITH_NTFS_3G
+ case RESOURCE_IN_NTFS_VOLUME:
+ wimlib_assert(lte->ntfs_loc != NULL);
+ wimlib_assert(lte->attr != NULL);
+ {
+ u64 adjusted_offset;
+ if (lte->ntfs_loc->is_reparse_point)
+ adjusted_offset = offset + 8;
+ else
+ adjusted_offset = offset;
+ 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:
+ wimlib_assert(0);
+ ret = -1;
+ break;
+ }
+ return ret;
+}
+
+/*
+ * Reads all the data from the resource corresponding to a WIM lookup table
+ * entry.
*
- * @contents_ret: An array, that must have length at least @len,
- * into which the uncompressed contents of
- * the file resource starting at @offset and
- * continuing for @len bytes will be written.
+ * @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.
*
- * @return: Zero on success, nonzero on failure. Failure may be due to
- * being unable to read the data from the WIM file at the
- * specified length and offset, or it may be due to the
- * compressed data (if the data is compressed) being
- * invalid.
+ * Returns 0 on success; nonzero on failure.
*/
-int read_resource(FILE *fp, u64 resource_size, u64 resource_original_size,
- u64 resource_offset, int resource_ctype, u64 len,
- u64 offset, void *contents_ret)
+int read_full_wim_resource(const struct lookup_table_entry *lte, u8 buf[])
{
- if (resource_ctype == WIM_COMPRESSION_TYPE_NONE) {
- if (resource_size != resource_original_size) {
- ERROR("Resource with original size %"PRIu64" "
- "bytes is marked as uncompressed, \n",
- resource_original_size);
- ERROR(" but its actual size is %"PRIu64" "
- "bytes!\n",
- resource_size);
- return WIMLIB_ERR_INVALID_RESOURCE_SIZE;
- }
- return read_uncompressed_resource(fp,
- resource_offset + offset,
- len, contents_ret);
+ return read_wim_resource(lte, buf, wim_resource_size(lte), 0, false);
+}
+
+/* Chunk table that's located at the beginning of each compressed resource in
+ * the WIM. (This is not the on-disk format; the on-disk format just has an
+ * array of offsets.) */
+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];
+};
+
+/*
+ * Allocates and initializes a chunk table, and reserves space for it in the
+ * output file.
+ */
+static int
+begin_wim_resource_chunk_tab(const struct lookup_table_entry *lte,
+ FILE *out_fp,
+ off_t file_offset,
+ struct chunk_table **chunk_tab_ret)
+{
+ u64 size = wim_resource_size(lte);
+ u64 num_chunks = (size + WIM_CHUNK_SIZE - 1) / WIM_CHUNK_SIZE;
+ size_t alloc_size = sizeof(struct chunk_table) + num_chunks * sizeof(u64);
+ struct chunk_table *chunk_tab = CALLOC(1, alloc_size);
+ int ret;
+
+ if (!chunk_tab) {
+ ERROR("Failed to allocate chunk table for %"PRIu64" byte "
+ "resource", size);
+ ret = WIMLIB_ERR_NOMEM;
+ goto out;
+ }
+ chunk_tab->file_offset = file_offset;
+ chunk_tab->num_chunks = num_chunks;
+ chunk_tab->original_resource_size = size;
+ chunk_tab->bytes_per_chunk_entry = (size >= (1ULL << 32)) ? 8 : 4;
+ chunk_tab->table_disk_size = chunk_tab->bytes_per_chunk_entry *
+ (num_chunks - 1);
+ chunk_tab->cur_offset = 0;
+ chunk_tab->cur_offset_p = chunk_tab->offsets;
+
+ 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;
+ }
+
+ ret = 0;
+out:
+ *chunk_tab_ret = chunk_tab;
+ return ret;
+}
+
+/*
+ * Compresses a chunk of a WIM resource.
+ *
+ * @chunk: Uncompressed data of the chunk.
+ * @chunk_size: Size of the uncompressed chunk in bytes.
+ * @compressed_chunk: Pointer to output buffer of size at least
+ * (@chunk_size - 1) bytes.
+ * @compressed_chunk_len_ret: Pointer to an unsigned int into which the size
+ * of the compressed chunk will be
+ * returned.
+ * @ctype: Type of compression to use. Must be WIM_COMPRESSION_TYPE_LZX
+ * or WIM_COMPRESSION_TYPE_XPRESS.
+ *
+ * Returns zero if compressed succeeded, and nonzero if the chunk could not be
+ * compressed to any smaller than @chunk_size. This function cannot fail for
+ * any other reasons.
+ */
+static int compress_chunk(const u8 chunk[], unsigned chunk_size,
+ u8 compressed_chunk[],
+ unsigned *compressed_chunk_len_ret,
+ int ctype)
+{
+ int (*compress)(const void *, unsigned, void *, unsigned *);
+ switch (ctype) {
+ case WIM_COMPRESSION_TYPE_LZX:
+ compress = lzx_compress;
+ break;
+ case WIM_COMPRESSION_TYPE_XPRESS:
+ compress = xpress_compress;
+ break;
+ default:
+ wimlib_assert(0);
+ break;
+ }
+ return (*compress)(chunk, chunk_size, compressed_chunk,
+ compressed_chunk_len_ret);
+}
+
+/*
+ * Writes a chunk of a WIM resource to an output file.
+ *
+ * @chunk: Uncompressed data of the chunk.
+ * @chunk_size: Size of the chunk (<= WIM_CHUNK_SIZE)
+ * @out_fp: FILE * to write tho chunk to.
+ * @out_ctype: Compression type to use when writing the chunk (ignored if no
+ * chunk table provided)
+ * @chunk_tab: Pointer to chunk table being created. It is updated with the
+ * offset of the chunk we write.
+ *
+ * Returns 0 on success; nonzero on failure.
+ */
+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;
+
+ wimlib_assert(chunk_size <= WIM_CHUNK_SIZE);
+
+ if (!chunk_tab) {
+ out_chunk = chunk;
+ out_chunk_size = chunk_size;
} else {
- return read_compressed_resource(fp, resource_size,
- resource_original_size, resource_offset,
- resource_ctype, len, offset, contents_ret);
+ u8 *compressed_chunk = alloca(chunk_size);
+ int ret;
+
+ ret = compress_chunk(chunk, chunk_size, compressed_chunk,
+ &out_chunk_size, out_ctype);
+ if (ret == 0) {
+ out_chunk = compressed_chunk;
+ } else {
+ out_chunk = chunk;
+ out_chunk_size = chunk_size;
+ }
+ *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;
}
+/*
+ * Finishes a WIM chunk tale and writes it to the output file at the correct
+ * offset.
+ *
+ * The final size of the full compressed resource is returned in the
+ * @compressed_size_p.
+ */
+static int
+finish_wim_resource_chunk_tab(struct chunk_table *chunk_tab,
+ FILE *out_fp, u64 *compressed_size_p)
+{
+ size_t bytes_written;
+ if (fseeko(out_fp, chunk_tab->file_offset, SEEK_SET) != 0) {
+ ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" of output "
+ "WIM file", chunk_tab->file_offset);
+ return WIMLIB_ERR_WRITE;
+ }
-/*
- * Extracts the first @size bytes file resource specified by @entry to the open
- * file @fd. Returns nonzero on error.
+ if (chunk_tab->bytes_per_chunk_entry == 8) {
+ array_cpu_to_le64(chunk_tab->offsets, chunk_tab->num_chunks);
+ } else {
+ for (u64 i = 0; i < chunk_tab->num_chunks; i++)
+ ((u32*)chunk_tab->offsets)[i] =
+ cpu_to_le32(chunk_tab->offsets[i]);
+ }
+ bytes_written = fwrite((u8*)chunk_tab->offsets +
+ chunk_tab->bytes_per_chunk_entry,
+ 1, chunk_tab->table_disk_size, out_fp);
+ if (bytes_written != 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, 0, SEEK_END) != 0) {
+ ERROR_WITH_ERRNO("Failed to seek to end of output WIM file");
+ return WIMLIB_ERR_WRITE;
+ }
+ *compressed_size_p = chunk_tab->cur_offset + chunk_tab->table_disk_size;
+ return 0;
+}
+
+/*
+ * Writes a WIM resource to a FILE * opened for writing. The resource may be
+ * written uncompressed or compressed depending on the @out_ctype parameter.
+ *
+ * If by chance the resource compresses to more than the original size (this may
+ * happen with random data or files than are pre-compressed), the resource is
+ * instead written uncompressed (and this is reflected in the @out_res_entry by
+ * removing the WIM_RESHDR_FLAG_COMPRESSED flag).
+ *
+ * @lte: The lookup table entry for the WIM resource.
+ * @out_fp: The FILE * to write the resource to.
+ * @out_ctype: The compression type of the resource to write. Note: if this is
+ * the same as the compression type of the WIM resource we
+ * need to read, we simply copy the data (i.e. we do not
+ * uncompress it, then compress it again).
+ * @out_res_entry: If non-NULL, a resource entry that is filled in with the
+ * offset, original size, compressed size, and compression flag
+ * of the output resource.
*
- * XXX
- * This function is somewhat redundant with uncompress_resource(). The
- * main difference is that this function writes to a file descriptor using
- * low-level calls to write() rather than to a FILE* with fwrite(); also this
- * function allows only up to @size bytes to be extracted.
+ * Returns 0 on success; nonzero on failure.
*/
-int extract_resource_to_fd(WIMStruct *w, const struct resource_entry *entry,
- int fd, u64 size)
+static int write_wim_resource(struct lookup_table_entry *lte,
+ FILE *out_fp, int out_ctype,
+ struct resource_entry *out_res_entry)
{
- u64 num_chunks;
- u64 n;
- u8 buf[min(size, WIM_CHUNK_SIZE)];
- int res_ctype;
+ u64 bytes_remaining;
+ u64 original_size;
+ u64 old_compressed_size;
+ u64 new_compressed_size;
u64 offset;
- u64 i;
int ret;
+ struct chunk_table *chunk_tab = NULL;
+ bool raw;
+ off_t file_offset;
+#ifdef WITH_NTFS_3G
+ ntfs_inode *ni = NULL;
+#endif
+
+ wimlib_assert(lte);
+
+ /* Original size of the resource */
+ original_size = wim_resource_size(lte);
+
+ /* Compressed size of the resource (as it exists now) */
+ old_compressed_size = wim_resource_compressed_size(lte);
+
+ /* Current offset in output file */
+ file_offset = ftello(out_fp);
+ if (file_offset == -1) {
+ ERROR_WITH_ERRNO("Failed to get offset in output "
+ "stream");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ /* Are the compression types the same? If so, do a raw copy (copy
+ * without decompressing and recompressing the data). */
+ raw = (wim_resource_compression_type(lte) == out_ctype
+ && out_ctype != WIM_COMPRESSION_TYPE_NONE);
+ if (raw)
+ bytes_remaining = old_compressed_size;
+ else
+ bytes_remaining = original_size;
- errno = 0;
+ /* Empty resource; nothing needs to be done, so just return success. */
+ if (bytes_remaining == 0)
+ return 0;
+
+ /* Buffer for reading chunks for the resource */
+ u8 buf[min(WIM_CHUNK_SIZE, bytes_remaining)];
+
+ /* If we are writing a compressed resource and not doing a raw copy, we
+ * need to initialize the chunk table */
+ if (out_ctype != WIM_COMPRESSION_TYPE_NONE && !raw) {
+ ret = begin_wim_resource_chunk_tab(lte, out_fp, file_offset,
+ &chunk_tab);
+ if (ret != 0)
+ goto out;
+ }
+
+ /* If the WIM resource is in an external file, open a FILE * to it so we
+ * don't have to open a temporary one in read_wim_resource() for each
+ * chunk. */
+ if (lte->resource_location == RESOURCE_IN_FILE_ON_DISK
+ && !lte->file_on_disk_fp)
+ {
+ wimlib_assert(lte->file_on_disk);
+ lte->file_on_disk_fp = fopen(lte->file_on_disk, "rb");
+ if (!lte->file_on_disk_fp) {
+ ERROR_WITH_ERRNO("Failed to open the file `%s' for "
+ "reading", lte->file_on_disk);
+ ret = WIMLIB_ERR_OPEN;
+ goto out;
+ }
+ }
+#ifdef WITH_NTFS_3G
+ else if (lte->resource_location == RESOURCE_IN_NTFS_VOLUME
+ && !lte->attr)
+ {
+ struct ntfs_location *loc = lte->ntfs_loc;
+ wimlib_assert(loc);
+ ni = ntfs_pathname_to_inode(*loc->ntfs_vol_p, NULL, loc->path_utf8);
+ if (!ni) {
+ ERROR_WITH_ERRNO("Failed to open inode `%s' in NTFS "
+ "volume", loc->path_utf8);
+ ret = WIMLIB_ERR_NTFS_3G;
+ goto out;
+ }
+ lte->attr = ntfs_attr_open(ni,
+ loc->is_reparse_point ? AT_REPARSE_POINT : AT_DATA,
+ (ntfschar*)loc->stream_name_utf16,
+ loc->stream_name_utf16_num_chars);
+ if (!lte->attr) {
+ ERROR_WITH_ERRNO("Failed to open attribute of `%s' in "
+ "NTFS volume", loc->path_utf8);
+ ret = WIMLIB_ERR_NTFS_3G;
+ goto out_fclose;
+ }
+ }
+#endif
- num_chunks = (size + WIM_CHUNK_SIZE - 1) / WIM_CHUNK_SIZE;
- n = WIM_CHUNK_SIZE;
- res_ctype = wim_resource_compression_type(w, entry);
+ /* If we aren't doing a raw copy, we will compute the SHA1 message
+ * digest of the resource as we read it, and verify it's the same as the
+ * hash given in the lookup table entry once we've finished reading the
+ * resource. */
+ SHA_CTX ctx;
+ if (!raw)
+ sha1_init(&ctx);
+
+ /* While there are still bytes remaining in the WIM resource, read a
+ * chunk of the resource, update SHA1, then write that chunk using the
+ * desired compression type. */
offset = 0;
- for (i = 0; i < num_chunks; i++) {
- if (i == num_chunks - 1) {
- n = size % WIM_CHUNK_SIZE;
- if (n == 0) {
- n = WIM_CHUNK_SIZE;
+ do {
+ u64 to_read = min(bytes_remaining, WIM_CHUNK_SIZE);
+ ret = read_wim_resource(lte, buf, to_read, offset, raw);
+ if (ret != 0)
+ goto out_fclose;
+ if (!raw)
+ sha1_update(&ctx, buf, to_read);
+ ret = write_wim_resource_chunk(buf, to_read, out_fp,
+ out_ctype, chunk_tab);
+ if (ret != 0)
+ goto out_fclose;
+ bytes_remaining -= to_read;
+ offset += to_read;
+ } while (bytes_remaining);
+
+ /* Raw copy: The new compressed size is the same as the old compressed
+ * size
+ *
+ * Using WIM_COMPRESSION_TYPE_NONE: The new compressed size is the
+ * original size
+ *
+ * Using a different compression type: Call
+ * finish_wim_resource_chunk_tab() and it will provide the new
+ * compressed size.
+ */
+ if (raw) {
+ new_compressed_size = old_compressed_size;
+ } else {
+ if (out_ctype == WIM_COMPRESSION_TYPE_NONE)
+ new_compressed_size = original_size;
+ else {
+ ret = finish_wim_resource_chunk_tab(chunk_tab, out_fp,
+ &new_compressed_size);
+ if (ret != 0)
+ goto out_fclose;
+ }
+ }
+
+ /* Verify SHA1 message digest of the resource, unless we are doing a raw
+ * write (in which case we never even saw the uncompressed data). Or,
+ * if the hash we had before is all 0's, just re-set it to be the new
+ * hash. */
+ if (!raw) {
+ u8 md[SHA1_HASH_SIZE];
+ sha1_final(md, &ctx);
+ if (is_zero_hash(lte->hash)) {
+ copy_hash(lte->hash, md);
+ } else if (!hashes_equal(md, lte->hash)) {
+ ERROR("WIM resource has incorrect hash!");
+ if (lte->resource_location == RESOURCE_IN_FILE_ON_DISK) {
+ ERROR("We were reading it from `%s'; maybe it changed "
+ "while we were reading it.",
+ lte->file_on_disk);
}
+ ret = WIMLIB_ERR_INVALID_RESOURCE_HASH;
+ goto out_fclose;
}
+ }
- ret = read_resource(w->fp, entry->size, entry->original_size,
- entry->offset, res_ctype, n, offset, buf);
+ if (!raw && new_compressed_size >= original_size &&
+ out_ctype != WIM_COMPRESSION_TYPE_NONE)
+ {
+ /* Oops! We compressed the resource to larger than the original
+ * size. Write the resource uncompressed instead. */
+ if (fseeko(out_fp, file_offset, SEEK_SET) != 0) {
+ ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" "
+ "of output WIM file", file_offset);
+ ret = WIMLIB_ERR_WRITE;
+ goto out_fclose;
+ }
+ ret = write_wim_resource(lte, out_fp, WIM_COMPRESSION_TYPE_NONE,
+ out_res_entry);
if (ret != 0)
- return ret;
-
- if (full_write(fd, buf, n) != n)
- return WIMLIB_ERR_WRITE;
- offset += n;
+ goto out_fclose;
+ if (fflush(out_fp) != 0) {
+ ERROR_WITH_ERRNO("Failed to flush output WIM file");
+ ret = WIMLIB_ERR_WRITE;
+ goto out_fclose;
+ }
+ if (ftruncate(fileno(out_fp), file_offset + out_res_entry->size) != 0) {
+ ERROR_WITH_ERRNO("Failed to truncate output WIM file");
+ ret = WIMLIB_ERR_WRITE;
+ goto out_fclose;
+ }
+ } else {
+ if (out_res_entry) {
+ out_res_entry->size = new_compressed_size;
+ out_res_entry->original_size = original_size;
+ out_res_entry->offset = file_offset;
+ out_res_entry->flags = lte->resource_entry.flags
+ & ~WIM_RESHDR_FLAG_COMPRESSED;
+ if (out_ctype != WIM_COMPRESSION_TYPE_NONE)
+ out_res_entry->flags |= WIM_RESHDR_FLAG_COMPRESSED;
+ }
}
+ ret = 0;
+out_fclose:
+ if (lte->resource_location == RESOURCE_IN_FILE_ON_DISK
+ && lte->file_on_disk_fp) {
+ fclose(lte->file_on_disk_fp);
+ lte->file_on_disk_fp = NULL;
+ }
+#ifdef WITH_NTFS_3G
+ else if (lte->resource_location == RESOURCE_IN_NTFS_VOLUME) {
+ if (lte->attr) {
+ ntfs_attr_close(lte->attr);
+ lte->attr = NULL;
+ }
+ if (ni)
+ ntfs_inode_close(ni);
+ }
+#endif
+out:
+ FREE(chunk_tab);
return ret;
}
-/* 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. */
-const u8 *get_resource_entry(const u8 *p, struct resource_entry *entry)
+/* Like write_wim_resource(), but the resource is specified by a buffer of
+ * uncompressed data rather a lookup table entry; also writes the SHA1 hash of
+ * the buffer to @hash. */
+static int write_wim_resource_from_buffer(const u8 *buf, u64 buf_size,
+ FILE *out_fp, int out_ctype,
+ struct resource_entry *out_res_entry,
+ u8 hash[SHA1_HASH_SIZE])
{
- u64 size;
- u8 flags;
+ /* Set up a temporary lookup table entry to provide to
+ * write_wim_resource(). */
+ struct lookup_table_entry lte;
+ int ret;
+ 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;
+
+ zero_out_hash(lte.hash);
+ ret = write_wim_resource(<e, out_fp, out_ctype, out_res_entry);
+ if (ret != 0)
+ return ret;
+ copy_hash(hash, lte.hash);
+ return 0;
+}
- p = get_u56(p, &size);
- p = get_u8(p, &flags);
- entry->size = size;
- entry->flags = flags;
- p = get_u64(p, &entry->offset);
- p = get_u64(p, &entry->original_size);
- return p;
+/*
+ * Extracts the first @size bytes of the WIM resource specified by @lte to the
+ * open file descriptor @fd.
+ *
+ * Returns 0 on success; nonzero on failure.
+ */
+int extract_wim_resource_to_fd(const struct lookup_table_entry *lte, int fd,
+ u64 size)
+{
+ u64 bytes_remaining = size;
+ u8 buf[min(WIM_CHUNK_SIZE, bytes_remaining)];
+ u64 offset = 0;
+ int ret = 0;
+ u8 hash[SHA1_HASH_SIZE];
+
+ SHA_CTX ctx;
+ sha1_init(&ctx);
+
+ while (bytes_remaining) {
+ u64 to_read = min(bytes_remaining, WIM_CHUNK_SIZE);
+ ret = read_wim_resource(lte, buf, to_read, offset, false);
+ if (ret != 0)
+ break;
+ sha1_update(&ctx, buf, to_read);
+ if (full_write(fd, buf, to_read) < to_read) {
+ ERROR_WITH_ERRNO("Error extracting WIM resource");
+ return WIMLIB_ERR_WRITE;
+ }
+ bytes_remaining -= to_read;
+ offset += to_read;
+ }
+ sha1_final(hash, &ctx);
+ if (!hashes_equal(hash, lte->hash)) {
+ ERROR("Invalid checksum on a WIM resource "
+ "(detected when extracting to external file)");
+ ERROR("The following WIM resource is invalid:");
+ print_lookup_table_entry(lte);
+ return WIMLIB_ERR_INVALID_RESOURCE_HASH;
+ }
+ return 0;
}
-/* Copies the struct resource_entry @entry to the memory pointed to by @p in the
- * on-disk format. A pointer to the byte after the memory written at @p is
- * returned. */
-u8 *put_resource_entry(u8 *p, const struct resource_entry *entry)
+/*
+ * Extracts the WIM resource specified by @lte to the open file descriptor @fd.
+ *
+ * Returns 0 on success; nonzero on failure.
+ */
+int extract_full_wim_resource_to_fd(const struct lookup_table_entry *lte, int fd)
{
- p = put_u56(p, entry->size);
- p = put_u8(p, entry->flags);
- p = put_u64(p, entry->offset);
- p = put_u64(p, entry->original_size);
- return p;
+ return extract_wim_resource_to_fd(lte, fd, wim_resource_size(lte));
+}
+
+/*
+ * Copies the file resource specified by the lookup table entry @lte from the
+ * 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).
+ */
+int copy_resource(struct lookup_table_entry *lte, void *wim)
+{
+ WIMStruct *w = wim;
+ int ret;
+
+ if ((lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) &&
+ !w->write_metadata)
+ return 0;
+
+ ret = write_wim_resource(lte, w->out_fp,
+ wim_resource_compression_type(lte),
+ <e->output_resource_entry);
+ if (ret != 0)
+ return ret;
+ lte->out_refcnt = lte->refcnt;
+ lte->part_number = w->hdr.part_number;
+ return 0;
}
-/* Given the compression type for the WIM file as a whole as the flags field of
- * a resource entry, returns the compression type for that resource entry. */
-int resource_compression_type(int wim_ctype, int reshdr_flags)
+/*
+ * 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 containing @dentry.
+ *
+ * @return zero on success, nonzero on failure.
+ */
+int write_dentry_resources(struct dentry *dentry, void *wim_p)
{
- if (wim_ctype == WIM_COMPRESSION_TYPE_NONE) {
- return WIM_COMPRESSION_TYPE_NONE;
- } else {
- if (reshdr_flags & WIM_RESHDR_FLAG_COMPRESSED)
- return wim_ctype;
- else
- return WIM_COMPRESSION_TYPE_NONE;
+ WIMStruct *w = wim_p;
+ int ret = 0;
+ struct lookup_table_entry *lte;
+ int ctype = wimlib_get_compression_type(w);
+
+ if (w->write_flags & WIMLIB_WRITE_FLAG_VERBOSE) {
+ wimlib_assert(dentry->full_path_utf8);
+ printf("Writing streams for `%s'\n", dentry->full_path_utf8);
+ }
+
+ for (unsigned i = 0; i <= dentry->d_inode->num_ads; i++) {
+ lte = inode_stream_lte(dentry->d_inode, i, w->lookup_table);
+ if (lte && ++lte->out_refcnt == 1) {
+ ret = write_wim_resource(lte, w->out_fp, ctype,
+ <e->output_resource_entry);
+ 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
* length 8, because that's how long the 'length' field is.
*
* @fp: The FILE* for the input WIM file.
- * @res_entry: The resource entry for the metadata resource (a.k.a the metadata
- * for the metadata)
* @wim_ctype: The compression type of the WIM file.
- * @root_dentry_p: A pointer to a pointer to a struct dentry structure into which the
- * root dentry is allocated and returned.
+ * @imd: Pointer to the image metadata structure. Its `metadata_lte'
+ * 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: True on success, false on failure.
+ * @return: Zero on success, nonzero on failure.
*/
-int read_metadata_resource(FILE *fp, const struct resource_entry *res_entry,
- int wim_ctype, struct dentry **root_dentry_p)
+int read_metadata_resource(WIMStruct *w, struct image_metadata *imd)
{
u8 *buf;
- int ctype;
u32 dentry_offset;
int ret;
struct dentry *dentry;
+ struct inode_table inode_tab;
+ const struct lookup_table_entry *metadata_lte;
+ u64 metadata_len;
+ u64 metadata_offset;
+ struct hlist_head inode_list;
+
+ metadata_lte = imd->metadata_lte;
+ metadata_len = wim_resource_size(metadata_lte);
+ metadata_offset = metadata_lte->resource_entry.offset;
+
+ DEBUG("Reading metadata resource: length = %"PRIu64", "
+ "offset = %"PRIu64"", metadata_len, metadata_offset);
+
+ /* There is no way the metadata resource could possibly be less than (8
+ * + WIM_DENTRY_DISK_SIZE) bytes, where the 8 is for security data (with
+ * no security descriptors) and WIM_DENTRY_DISK_SIZE is for the root
+ * dentry. */
+ if (metadata_len < 8 + WIM_DENTRY_DISK_SIZE) {
+ ERROR("Expected at least %u bytes for the metadata resource",
+ 8 + WIM_DENTRY_DISK_SIZE);
+ return WIMLIB_ERR_INVALID_RESOURCE_SIZE;
+ }
- DEBUG("Reading metadata resource: length = %lu, offset = %lu\n",
- res_entry->original_size, res_entry->offset);
-
- if (res_entry->original_size < 8) {
- ERROR("Expected at least 8 bytes for the metadata "
- "resource!\n");
+ if (sizeof(size_t) < 8 && metadata_len > 0xffffffff) {
+ ERROR("Metadata resource is too large (%"PRIu64" bytes",
+ metadata_len);
return WIMLIB_ERR_INVALID_RESOURCE_SIZE;
}
/* Allocate memory for the uncompressed metadata resource. */
- buf = MALLOC(res_entry->original_size);
+ buf = MALLOC(metadata_len);
if (!buf) {
ERROR("Failed to allocate %"PRIu64" bytes for uncompressed "
- "metadata resource!\n",
- res_entry->original_size);
+ "metadata resource", metadata_len);
return WIMLIB_ERR_NOMEM;
}
- /* Determine the compression type of the metadata resource. */
- ctype = resource_compression_type(wim_ctype, res_entry->flags);
-
/* Read the metadata resource into memory. (It may be compressed.) */
- ret = read_full_resource(fp, res_entry->size,
- res_entry->original_size, res_entry->offset,
- ctype, buf);
+ ret = read_full_wim_resource(metadata_lte, buf);
if (ret != 0)
- goto err1;
+ goto out_free_buf;
- DEBUG("Finished reading metadata resource into memory.\n");
+ DEBUG("Finished reading metadata resource into memory.");
-#if 0
- /* Read the security data into a WIMSecurityData structure. */
- if (!read_security_data(buf, res_entry->original_size, sd))
- goto err1;
-#endif
+ /* The root directory entry starts after security data, aligned on an
+ * 8-byte boundary within the metadata resource.
+ *
+ * The security data starts with a 4-byte integer giving its total
+ * length, so if we round that up to an 8-byte boundary that gives us
+ * the offset of the root dentry.
+ *
+ * Here we read the security data into a wim_security_data structure,
+ * and if successful, go ahead and calculate the offset in the metadata
+ * resource of the root dentry. */
+
+ wimlib_assert(imd->security_data == NULL);
+ ret = read_security_data(buf, metadata_len, &imd->security_data);
+ if (ret != 0)
+ goto out_free_buf;
+
+ dentry_offset = imd->security_data->total_length + 7 & ~7;
+
+ if (dentry_offset == 0) {
+ ERROR("Integer overflow while reading metadata resource");
+ ret = WIMLIB_ERR_INVALID_SECURITY_DATA;
+ goto out_free_security_data;
+ }
+ /* Allocate memory for the root dentry and read it into memory */
dentry = MALLOC(sizeof(struct dentry));
if (!dentry) {
- ERROR("Failed to allocate %zu bytes for root dentry!\n",
- sizeof(struct dentry));
+ ERROR("Failed to allocate %zu bytes for root dentry",
+ sizeof(struct dentry));
ret = WIMLIB_ERR_NOMEM;
- goto err1;
+ goto out_free_security_data;
}
- /* Read 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. */
- get_u32(buf, &dentry_offset);
- dentry_offset += (8 - dentry_offset % 8) % 8;
-
- ret = read_dentry(buf, res_entry->original_size, dentry_offset, dentry);
- if (ret != 0)
- goto err1;
+ ret = read_dentry(buf, metadata_len, 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;
+ inode_add_dentry(dentry, dentry->d_inode);
- /* Now read the entire directory entry tree. */
- ret = read_dentry_tree(buf, res_entry->original_size, dentry);
+ /* Now read the entire directory entry tree into memory. */
+ DEBUG("Reading dentry tree");
+ ret = read_dentry_tree(buf, metadata_len, dentry);
if (ret != 0)
- goto err2;
+ goto out_free_dentry_tree;
/* Calculate the full paths in the dentry tree. */
+ DEBUG("Calculating dentry full paths");
ret = for_dentry_in_tree(dentry, calculate_dentry_full_path, NULL);
if (ret != 0)
- goto err2;
+ goto out_free_dentry_tree;
- *root_dentry_p = dentry;
- FREE(buf);
- return ret;
-err2:
- free_dentry_tree(dentry, NULL, false);
-err1:
+ /* Build hash table that maps hard link group IDs to dentry sets */
+ DEBUG("Building link group table");
+ ret = init_inode_table(&inode_tab, 9001);
+ if (ret != 0)
+ goto out_free_dentry_tree;
+
+ for_dentry_in_tree(dentry, inode_table_insert, &inode_tab);
+
+ DEBUG("Fixing inconsistencies in the hard link groups");
+ ret = fix_inodes(&inode_tab, &inode_list);
+ destroy_inode_table(&inode_tab);
+ if (ret != 0)
+ goto out_free_dentry_tree;
+
+ DEBUG("Running miscellaneous verifications on the dentry tree");
+ for_lookup_table_entry(w->lookup_table, lte_zero_real_refcnt, NULL);
+ ret = for_dentry_in_tree(dentry, verify_dentry, w);
+ if (ret != 0)
+ goto out_free_dentry_tree;
+
+ DEBUG("Done reading image metadata");
+
+ imd->root_dentry = dentry;
+ imd->inode_list = inode_list;
+ goto out_free_buf;
+out_free_dentry_tree:
+ free_dentry_tree(dentry, NULL);
+out_free_security_data:
+ free_security_data(imd->security_data);
+ imd->security_data = NULL;
+out_free_buf:
FREE(buf);
return ret;
}
+/* Write the metadata resource for the current WIM image. */
+int write_metadata_resource(WIMStruct *w)
+{
+ u8 *buf;
+ u8 *p;
+ int ret;
+ u64 subdir_offset;
+ struct dentry *root;
+ struct lookup_table_entry *lte;
+ u64 metadata_original_size;
+ const struct wim_security_data *sd;
+
+ DEBUG("Writing metadata resource for image %d", w->current_image);
+
+ root = wim_root_dentry(w);
+ sd = wim_security_data(w);
+
+ /* We do not allow the security data pointer to be NULL, although it may
+ * point to an empty security data with no entries. */
+ wimlib_assert(root != NULL);
+ wimlib_assert(sd != NULL);
+
+ /* Offset of first child of the root dentry. It's equal to:
+ * - The total length of the security data, rounded to the next 8-byte
+ * boundary,
+ * - plus the total length of the root dentry,
+ * - plus 8 bytes for an end-of-directory entry following the root
+ * dentry (shouldn't really be needed, but just in case...)
+ */
+ subdir_offset = ((sd->total_length + 7) & ~7) +
+ dentry_correct_total_length(root) + 8;
+
+ /* Calculate the subdirectory offsets for the entire dentry tree. */
+ calculate_subdir_offsets(root, &subdir_offset);
+
+ /* Total length of the metadata resource (uncompressed) */
+ metadata_original_size = subdir_offset;
+
+ /* Allocate a buffer to contain the uncompressed metadata resource */
+ buf = MALLOC(metadata_original_size);
+ if (!buf) {
+ ERROR("Failed to allocate %"PRIu64" bytes for "
+ "metadata resource", metadata_original_size);
+ return WIMLIB_ERR_NOMEM;
+ }
+
+ /* Write the security data into the resource buffer */
+ p = write_security_data(sd, buf);
+
+ /* Write the dentry tree into the resource buffer */
+ p = write_dentry_tree(root, p);
+
+ /* We MUST have exactly filled the buffer; otherwise we calculated its
+ * size incorrectly or wrote the data incorrectly. */
+ wimlib_assert(p - buf == metadata_original_size);
+ /* Get the lookup table entry for the metadata resource so we can update
+ * it. */
+ lte = wim_metadata_lookup_table_entry(w);
+
+ wimlib_assert(lte != NULL);
+
+ /* Write the metadata resource to the output WIM using the proper
+ * compression type. The lookup table entry for the metadata resource
+ * is updated. */
+ ret = write_wim_resource_from_buffer(buf, metadata_original_size,
+ w->out_fp,
+ wimlib_get_compression_type(w),
+ <e->output_resource_entry,
+ lte->hash);
+ if (ret != 0)
+ goto out;
+
+ /* It's very likely the SHA1 message digest of the metadata resource
+ * changed, so re-insert the lookup table entry into the lookup table.
+ *
+ * We do not check for other lookup table entries having the same SHA1
+ * message digest. It's possible for 2 absolutely identical images to
+ * be added, therefore causing 2 identical metadata resources to be in
+ * the WIM. However, in this case, it's expected for 2 separate lookup
+ * table entries to be created, even though this doesn't make a whole
+ * lot of sense since they will share the same SHA1 message digest.
+ * */
+ lookup_table_unlink(w->lookup_table, lte);
+ lookup_table_insert(w->lookup_table, lte);
+
+ wimlib_assert(lte->out_refcnt == 0);
+ lte->out_refcnt = 1;
+
+ /* Make sure that the resource entry is written marked with the metadata
+ * flag. */
+ lte->output_resource_entry.flags |= WIM_RESHDR_FLAG_METADATA;
+out:
+ /* All the data has been written to the new WIM; no need for the buffer
+ * anymore */
+ FREE(buf);
+ return ret;
+}
git://wimlib.net / wimlib / blobdiff