* 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 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.
+ * 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.
*
- * 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 Lesser General Public License
+ * along with wimlib; if not, see http://www.gnu.org/licenses/.
*/
#include "wimlib_internal.h"
+#include "lookup_table.h"
#include "io.h"
#include "lzx.h"
#include "xpress.h"
+#include "sha1.h"
#include "dentry.h"
+#include "config.h"
#include <unistd.h>
#include <errno.h>
+
/*
* Reads all or part of a compressed resource into an in-memory buffer.
*
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;
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;
}
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. */
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 */
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;
}
}
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;
}
{
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.
*
{
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);
+ ERROR("Resource with original size %"PRIu64" bytes is "
+ "marked as uncompressed, but its actual size is "
+ "%"PRIu64" bytes",
+ resource_original_size, resource_size);
return WIMLIB_ERR_INVALID_RESOURCE_SIZE;
}
return read_uncompressed_resource(fp,
return ret;
}
+/*
+ * 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.
+ *
+ * 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 *w)
+{
+ if ((lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) &&
+ !((WIMStruct*)w)->write_metadata) {
+ return 0;
+ }
+
+ FILE *in_fp = ((WIMStruct*)w)->fp;
+ FILE *out_fp = ((WIMStruct*)w)->out_fp;
+ int ret;
+ u64 size = lte->resource_entry.size;
+ u64 offset = lte->resource_entry.offset;
+ off_t new_offset = ftello(out_fp);
+
+ if (new_offset == -1)
+ return WIMLIB_ERR_WRITE;
+
+ ret = copy_between_files(in_fp, offset, out_fp, size);
+ 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 = ((WIMStruct*)w)->hdr.part_number;
+ 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. */
* a resource entry, returns the compression type for that resource entry. */
int resource_compression_type(int wim_ctype, int reshdr_flags)
{
- if (wim_ctype == WIM_COMPRESSION_TYPE_NONE) {
+ if (wim_ctype != WIM_COMPRESSION_TYPE_NONE &&
+ (reshdr_flags & WIM_RESHDR_FLAG_COMPRESSED))
+ return wim_ctype;
+ else
return WIM_COMPRESSION_TYPE_NONE;
+}
+
+
+
+/*
+ * Copies bytes between two file streams.
+ *
+ * Copies @len bytes from @in_fp to @out_fp, at the current position in @out_fp,
+ * and at an offset of @in_offset in @in_fp.
+ */
+int copy_between_files(FILE *in_fp, off_t in_offset, FILE *out_fp, size_t len)
+{
+ u8 buf[BUFFER_SIZE];
+ size_t n;
+
+ if (fseeko(in_fp, in_offset, SEEK_SET) != 0) {
+ ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" of "
+ "input file", 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_fp) != n) {
+ if (feof(in_fp)) {
+ ERROR("Unexpected EOF when copying data "
+ "between files");
+ } else {
+ ERROR_WITH_ERRNO("Error copying data between "
+ "files");
+ }
+ return WIMLIB_ERR_READ;
+ }
+
+ if (fwrite(buf, 1, n, out_fp) != n) {
+ ERROR_WITH_ERRNO("Error copying data between files");
+ return WIMLIB_ERR_WRITE;
+ }
+ len -= n;
+ }
+ return 0;
+}
+
+
+/*
+ * Uncompresses a WIM file resource and writes it uncompressed to a file stream.
+ *
+ * @in_fp: 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_fp: The file stream to write the file resource to.
+ */
+static int uncompress_resource(FILE *in_fp, u64 size, u64 original_size,
+ off_t offset, int input_ctype, FILE *out_fp)
+{
+ 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_fp, 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_fp) !=
+ uncompressed_chunk_size)
+ {
+ ERROR_WITH_ERRNO("Failed to write file resource");
+ 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_fp: 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_fp: 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_fp, const u8 *uncompressed_resource,
+ u64 size, u64 original_size,
+ off_t offset, int input_ctype, FILE *out_fp,
+ 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_fp);
+
+ if (chunk_tab_offset == -1) {
+ ERROR_WITH_ERRNO("Failed to get offset of output file");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ /* 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_fp) !=
+ chunk_tab_size)
+ {
+ ERROR_WITH_ERRNO("Failed to write chunk offset table");
+ 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_fp, 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_fp) !=
+ len_to_write)
+ {
+ ERROR_WITH_ERRNO("Failed to write compressed "
+ "file resource");
+ 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_fp, chunk_tab_offset, SEEK_SET) != 0) {
+ ERROR_WITH_ERRNO("Failed to seek to beginning of chunk table");
+ return WIMLIB_ERR_READ;
+ }
+
+ if (chunk_entry_size == 8) {
+ array_to_le64(chunk_offsets, num_chunk_entries);
} else {
- if (reshdr_flags & WIM_RESHDR_FLAG_COMPRESSED)
- return wim_ctype;
- else
- return WIM_COMPRESSION_TYPE_NONE;
+ for (u64 i = 0; i < num_chunk_entries; i++)
+ ((u32*)chunk_offsets)[i] = to_le32(chunk_offsets[i]);
+ }
+ if (fwrite(chunk_offsets, 1, chunk_tab_size, out_fp) != chunk_tab_size)
+ {
+ ERROR_WITH_ERRNO("Failed to write chunk table");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ if (fseeko(out_fp, 0, SEEK_END) != 0) {
+ ERROR_WITH_ERRNO("Failed to seek to end of output file");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ return 0;
+}
+
+int write_resource_from_memory(const u8 resource[], int out_ctype,
+ u64 resource_original_size, FILE *out_fp,
+ u64 *resource_size_ret)
+{
+ if (out_ctype == WIM_COMPRESSION_TYPE_NONE) {
+ if (fwrite(resource, 1, resource_original_size, out_fp) !=
+ resource_original_size)
+ {
+ ERROR_WITH_ERRNO("Failed to write resource of length "
+ "%"PRIu64, 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_fp,
+ 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_fp: 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_fp: 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_fp, u64 size, u64 original_size,
+ off_t offset, int input_ctype, FILE *out_fp,
+ 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. */
+ off_t out_offset = ftello(out_fp);
+ if (out_offset == -1) {
+ ERROR_WITH_ERRNO("Failed to get output position");
+ return WIMLIB_ERR_WRITE;
+ }
+ output_res_entry->offset = (u64)out_offset;
+
+ if (output_ctype == input_ctype) {
+ /* The same compression types; simply copy the resource. */
+
+ ret = copy_between_files(in_fp, offset, out_fp, 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_fp, size,
+ original_size, offset,
+ input_ctype, out_fp);
+ 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 */
+ ret = recompress_resource(in_fp, NULL, size,
+ original_size,
+ offset, input_ctype, out_fp,
+ 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;
+}
+
/*
* Reads the metadata metadata resource from the WIM file. The metadata
* resource consists of the security data, followed by the directory entry for
* 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
+ * `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: 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(FILE *fp, int wim_ctype, struct image_metadata *imd)
{
u8 *buf;
int ctype;
u32 dentry_offset;
int ret;
+ const struct resource_entry *res_entry;
struct dentry *dentry;
+ struct wim_security_data *sd;
+ struct link_group_table *lgt;
+
+ res_entry = &imd->metadata_lte->resource_entry;
- DEBUG("Reading metadata resource: length = %lu, offset = %lu\n",
- res_entry->original_size, res_entry->offset);
+ 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!\n");
+ ERROR("Expected at least 8 bytes for the metadata resource");
return WIMLIB_ERR_INVALID_RESOURCE_SIZE;
}
if (!buf) {
ERROR("Failed to allocate %"PRIu64" bytes for uncompressed "
- "metadata resource!\n",
- res_entry->original_size);
+ "metadata resource", res_entry->original_size);
return WIMLIB_ERR_NOMEM;
}
res_entry->original_size, res_entry->offset,
ctype, 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, 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!\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;
+ if (dentry_offset == 0)
+ dentry_offset = 8;
+ dentry_offset = (dentry_offset + 7) & ~7;
ret = read_dentry(buf, res_entry->original_size, dentry_offset, dentry);
- if (ret != 0)
- goto err1;
-
/* 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 err2;
+ 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 err2;
+ 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;
- *root_dentry_p = dentry;
+ 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;
-err2:
- free_dentry_tree(dentry, NULL, false);
-err1:
+}
+
+/* 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_resource_from_memory(buf,
+ metadata_ctype,
+ metadata_original_size,
+ out,
+ &metadata_compressed_size);
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;
+}
+
+static int write_file_resource(WIMStruct *w, struct lookup_table_entry *lte)
+{
+ if (!lte)
+ return 0;
+
+ /* No need to write file resources twice. */
+ if (++lte->out_refcnt != 1)
+ return 0;
+
+ /* do not write empty resources */
+ if (lte->resource_entry.original_size == 0)
+ return 0;
+
+ int out_wim_ctype = wimlib_get_compression_type(w);
+ struct resource_entry *output_res_entry = <e->output_resource_entry;
+ u64 len;
+ FILE *in_fp;
+ FILE *out_fp = w->out_fp;
+ int ret = 0;
+
+ /* Figure out if we can read the resource from the WIM file, or
+ * if we have to read it from the filesystem outside, or if it's a
+ * symbolic link with the data already in memory pointed to by a field
+ * of the lookup table entry. */
+ if (lte->is_symlink) {
+ off_t offset = ftello(w->out_fp);
+ u64 new_size;
+
+ if (offset == -1) {
+ ERROR_WITH_ERRNO("Could not get position in output "
+ "file");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ wimlib_assert(lte->symlink_buf);
+
+ len = lte->resource_entry.original_size;
+
+ ret = recompress_resource(NULL, lte->symlink_buf, len, len, 0,
+ 0, out_fp, out_wim_ctype, &new_size);
+ output_res_entry->size = new_size;
+ output_res_entry->original_size = len;
+ output_res_entry->offset = offset;
+ output_res_entry->flags = (out_wim_ctype == WIM_COMPRESSION_TYPE_NONE)
+ ? 0 : WIM_RESHDR_FLAG_COMPRESSED;
+ } else if (lte->file_on_disk) {
+
+ /* Read from disk (uncompressed) */
+
+ len = lte->resource_entry.original_size;
+
+ in_fp = fopen(lte->file_on_disk, "rb");
+ if (!in_fp) {
+ ERROR_WITH_ERRNO("Failed to open the file `%s'",
+ lte->file_on_disk);
+ return WIMLIB_ERR_OPEN;
+ }
+
+ ret = transfer_file_resource(in_fp, len, len, 0,
+ WIM_COMPRESSION_TYPE_NONE, out_fp,
+ out_wim_ctype, output_res_entry);
+ fclose(in_fp);
+ } else {
+ int in_wim_ctype;
+
+ /* 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_fp = lte->other_wim_fp;
+ in_wim_ctype = lte->other_wim_ctype;
+ } else {
+ /* Same WIM file. */
+ in_fp = w->fp;
+ in_wim_ctype = out_wim_ctype;
+ }
+ int input_res_ctype = resource_compression_type(
+ in_wim_ctype,
+ lte->resource_entry.flags);
+
+ ret = transfer_file_resource(in_fp,
+ lte->resource_entry.size,
+ lte->resource_entry.original_size,
+ lte->resource_entry.offset,
+ input_res_ctype,
+ out_fp,
+ out_wim_ctype,
+ output_res_entry);
+ }
return ret;
}
+/*
+ * 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;
+ struct lookup_table_entry *lte;
+
+ for (unsigned i = 0; i <= dentry->num_ads; i++) {
+ lte = dentry_stream_lte(dentry, i, w->lookup_table);
+ ret = write_file_resource(w, lte);
+ if (ret != 0)
+ return ret;
+ }
+ return 0;
+}
git://wimlib.net / wimlib / blobdiff