*/
#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>
+/* Used for buffering FILE IO */
+#define BUFFER_SIZE 4096
+
/*
* Reads all or part of a compressed resource into an in-memory buffer.
*
return 0;
}
+
/*
* Reads a WIM resource.
*
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. */
}
}
+
+
+/*
+ * Copies bytes between two file streams.
+ *
+ * Copies @len bytes from @in to @out, at the current position in @out, and at
+ * an offset of @in_offset in @in.
+ */
+int copy_between_files(FILE *in, off_t in_offset, FILE *out, size_t len)
+{
+ u8 buf[BUFFER_SIZE];
+ size_t n;
+
+ if (fseeko(in, in_offset, SEEK_SET) != 0) {
+ ERROR("Failed to seek to byte %"PRIu64" of input file: %m\n",
+ in_offset);
+ return WIMLIB_ERR_READ;
+ }
+ /* To reduce memory usage and improve speed, read and write BUFFER_SIZE
+ * bytes at a time. */
+ while (len != 0) {
+ n = min(len, BUFFER_SIZE);
+ if (fread(buf, 1, n, in) != n) {
+ if (feof(in)) {
+ ERROR("Unexpected EOF when copying data "
+ "between files\n");
+ } else {
+ ERROR("Error copying data between files: %m\n");
+ }
+ return WIMLIB_ERR_READ;
+ }
+
+ if (fwrite(buf, 1, n, out) != n) {
+ ERROR("Error copying data between files: %m\n");
+ return WIMLIB_ERR_WRITE;
+ }
+ len -= n;
+ }
+ return 0;
+}
+
+
+/*
+ * Uncompresses a WIM file resource and writes it uncompressed to a file stream.
+ *
+ * @in: The file stream that contains the file resource.
+ * @size: The size of the resource in the input file.
+ * @original_size: The original (uncompressed) size of the resource.
+ * @offset: The offset of the start of the resource in @in.
+ * @input_ctype: The compression type of the resource in @in.
+ * @out: The file stream to write the file resource to.
+ */
+static int uncompress_resource(FILE *in, u64 size, u64 original_size,
+ off_t offset, int input_ctype, FILE *out)
+{
+ int ret;
+ u8 buf[WIM_CHUNK_SIZE];
+ /* Determine how many compressed chunks the file is divided into. */
+ u64 num_chunks;
+ u64 i;
+ u64 uncompressed_offset;
+ u64 uncompressed_chunk_size;
+
+ num_chunks = (original_size + WIM_CHUNK_SIZE - 1) / WIM_CHUNK_SIZE;
+
+ for (i = 0; i < num_chunks; i++) {
+
+ uncompressed_offset = i * WIM_CHUNK_SIZE;
+ uncompressed_chunk_size = min(WIM_CHUNK_SIZE,
+ original_size - uncompressed_offset);
+
+ ret = read_resource(in, size, original_size, offset, input_ctype,
+ uncompressed_chunk_size,
+ uncompressed_offset, buf);
+ if (ret != 0)
+ return ret;
+
+ if (fwrite(buf, 1, uncompressed_chunk_size, out) !=
+ uncompressed_chunk_size) {
+ ERROR("Failed to write file resource: %m\n");
+ return WIMLIB_ERR_WRITE;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Transfers a file resource between two files, writing it compressed. The file
+ * resource in the input file may be either compressed or uncompressed.
+ * Alternatively, the input resource may be in-memory, but it must be
+ * uncompressed.
+ *
+ * @in: The file stream that contains the file resource. Ignored
+ * if uncompressed_resource != NULL.
+ * @uncompressed_resource: If this pointer is not NULL, it points to an
+ * array of @original_size bytes that are
+ * the uncompressed input resource.
+ * @size: The size of the resource in the input file.
+ * @original_size: The original (uncompressed) size of the resource.
+ * @offset: The offset of the start of the resource in @in. Ignored
+ * if uncompressed_resource != NULL.
+ * @input_ctype: The compression type of the resource in @in. Ignored if
+ * uncompressed_resource != NULL.
+ * @out: The file stream to write the file resource to.
+ * @output_type: The compression type to use when writing the resource to
+ * @out.
+ * @new_size_ret: A location into which the new compressed size of the file
+ * resource in returned.
+ */
+static int recompress_resource(FILE *in, const u8 *uncompressed_resource,
+ u64 size, u64 original_size,
+ off_t offset, int input_ctype, FILE *out,
+ int output_ctype, u64 *new_size_ret)
+{
+ int ret;
+ int (*compress)(const void *, uint, void *, uint *);
+ if (output_ctype == WIM_COMPRESSION_TYPE_LZX)
+ compress = lzx_compress;
+ else
+ compress = xpress_compress;
+
+ u8 uncompressed_buf[WIM_CHUNK_SIZE];
+ u8 compressed_buf[WIM_CHUNK_SIZE - 1];
+
+ /* Determine how many compressed chunks the file needs to be divided
+ * into. */
+ u64 num_chunks = (original_size + WIM_CHUNK_SIZE - 1) / WIM_CHUNK_SIZE;
+
+ u64 num_chunk_entries = num_chunks - 1;
+
+ /* Size of the chunk entries--- 8 bytes for files over 4GB, otherwise 4
+ * bytes */
+ uint chunk_entry_size = (original_size >= (u64)1 << 32) ? 8 : 4;
+
+ /* Array in which to construct the chunk offset table. */
+ u64 chunk_offsets[num_chunk_entries];
+
+ /* Offset of the start of the chunk table in the output file. */
+ off_t chunk_tab_offset = ftello(out);
+
+ /* Total size of the chunk table (as written to the file) */
+ u64 chunk_tab_size = chunk_entry_size * num_chunk_entries;
+
+ /* Reserve space for the chunk table. */
+ if (fwrite(chunk_offsets, 1, chunk_tab_size, out) != chunk_tab_size) {
+ ERROR("Failed to write chunk offset table: %m\n");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ /* Read each chunk of the file, compress it, write it to the output
+ * file, and update th chunk offset table. */
+ u64 cur_chunk_offset = 0;
+ for (u64 i = 0; i < num_chunks; i++) {
+
+ u64 uncompressed_offset = i * WIM_CHUNK_SIZE;
+ u64 uncompressed_chunk_size = min(WIM_CHUNK_SIZE,
+ original_size - uncompressed_offset);
+
+ const u8 *uncompressed_p;
+ if (uncompressed_resource != NULL) {
+ uncompressed_p = uncompressed_resource +
+ uncompressed_offset;
+
+ } else {
+ /* Read chunk i of the file into uncompressed_buf. */
+ ret = read_resource(in, size, original_size, offset, input_ctype,
+ uncompressed_chunk_size,
+ uncompressed_offset,
+ uncompressed_buf);
+ if (ret != 0)
+ return ret;
+ uncompressed_p = uncompressed_buf;
+ }
+
+ if (i != 0)
+ chunk_offsets[i - 1] = cur_chunk_offset;
+
+ uint compressed_len;
+
+ ret = compress(uncompressed_p, uncompressed_chunk_size,
+ compressed_buf, &compressed_len);
+
+ /* if compress() returned nonzero, the compressed chunk would
+ * have been at least as large as the uncompressed chunk. In
+ * this situation, the WIM format requires that the uncompressed
+ * chunk be written instead. */
+ const u8 *buf_to_write;
+ uint len_to_write;
+ if (ret == 0) {
+ buf_to_write = compressed_buf;
+ len_to_write = compressed_len;
+ } else {
+ buf_to_write = uncompressed_p;
+ len_to_write = uncompressed_chunk_size;
+ }
+
+ if (fwrite(buf_to_write, 1, len_to_write, out) != len_to_write) {
+ ERROR("Failed to write compressed file resource: %m\n");
+ return WIMLIB_ERR_WRITE;
+ }
+ cur_chunk_offset += len_to_write;
+ }
+
+ /* The chunk offset after the last chunk, plus the size of the chunk
+ * table, gives the total compressed size of the resource. */
+ *new_size_ret = cur_chunk_offset + chunk_tab_size;
+
+ /* Now that all entries of the chunk table are determined, rewind the
+ * stream to where the chunk table was, and write it back out. */
+
+ if (fseeko(out, chunk_tab_offset, SEEK_SET) != 0) {
+ ERROR("Failed to seek to beginning of chunk table: %m\n");
+ return WIMLIB_ERR_READ;
+ }
+
+ if (chunk_entry_size == 8) {
+ array_to_le64(chunk_offsets, num_chunk_entries);
+
+ if (fwrite(chunk_offsets, 1, chunk_tab_size, out) !=
+ chunk_tab_size) {
+ ERROR("Failed to write chunk table: %m\n");
+ return WIMLIB_ERR_WRITE;
+ }
+ } else {
+ u32 chunk_entries_small[num_chunk_entries];
+ for (u64 i = 0; i < num_chunk_entries; i++)
+ chunk_entries_small[i] = to_le32(chunk_offsets[i]);
+ if (fwrite(chunk_entries_small, 1, chunk_tab_size, out) !=
+ chunk_tab_size) {
+ ERROR("Failed to write chunk table: %m\n");
+ return WIMLIB_ERR_WRITE;
+ }
+ }
+
+ if (fseeko(out, 0, SEEK_END) != 0) {
+ ERROR("Failed to seek to end of output file: %m\n");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ return 0;
+}
+
+int write_resource_from_memory(const u8 resource[], int out_ctype,
+ u64 resource_original_size, FILE *out,
+ u64 *resource_size_ret)
+{
+ if (out_ctype == WIM_COMPRESSION_TYPE_NONE) {
+ if (fwrite(resource, 1, resource_original_size, out) !=
+ resource_original_size) {
+ ERROR("Failed to write resource of length "
+ "%"PRIu64": %m\n",
+ resource_original_size);
+ return WIMLIB_ERR_WRITE;
+ }
+ *resource_size_ret = resource_original_size;
+ return 0;
+ } else {
+ return recompress_resource(NULL, resource, resource_original_size,
+ resource_original_size, 0, 0, out, out_ctype,
+ resource_size_ret);
+ }
+}
+
+
+/*
+ * Transfers a file resource from a FILE* opened for reading to a FILE* opened
+ * for writing, possibly changing the compression type.
+ *
+ * @in: The FILE* that contains the file resource.
+ * @size: The (compressed) size of the file resource.
+ * @original_size: The uncompressed size of the file resource.
+ * @offset: The offset of the file resource in the input file.
+ * @input_ctype: The compression type of the file resource in the input
+ * file.
+ * @out: The FILE* for the output file. The file resource is
+ * written at the current position of @out.
+ * @output_ctype: The compression type to which the file resource will be
+ * converted.
+ * @output_res_entry: A pointer to a resource entry that, upon successful
+ * return of this function, will have the size,
+ * original size, offset, and flags fields filled
+ * in for the file resource written to the output
+ * file.
+ */
+static int transfer_file_resource(FILE *in, u64 size, u64 original_size,
+ off_t offset, int input_ctype, FILE *out,
+ int output_ctype,
+ struct resource_entry *output_res_entry)
+{
+ int ret;
+
+ /* Handle zero-length files */
+ if (original_size == 0) {
+ memset(output_res_entry, 0, sizeof(*output_res_entry));
+ return 0;
+ }
+
+ /* Get current offset in the output file. */
+ output_res_entry->offset = ftello(out);
+ if (output_res_entry->offset == -1) {
+ ERROR("Failed to get output position: %m\n");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ if (output_ctype == input_ctype) {
+ /* The same compression types; simply copy the resource. */
+
+ ret = copy_between_files(in, offset, out, size);
+ if (ret != 0)
+ return ret;
+ output_res_entry->size = size;
+ } else {
+ /* Different compression types. */
+
+ if (output_ctype == WIM_COMPRESSION_TYPE_NONE) {
+ /* Uncompress a compressed file resource */
+ ret = uncompress_resource(in, size,
+ original_size, offset,
+ input_ctype, out);
+ if (ret != 0)
+ return ret;
+ output_res_entry->size = original_size;
+ } else {
+ u64 new_size;
+ /* Compress an uncompressed file resource, or compress a
+ * compressed file resource using a different
+ * compression type */
+ ret = recompress_resource(in, NULL, size, original_size,
+ offset, input_ctype, out,
+ output_ctype, &new_size);
+ if (ret != 0)
+ return ret;
+ output_res_entry->size = new_size;
+ }
+
+ }
+
+ output_res_entry->original_size = original_size;
+ if (output_ctype == WIM_COMPRESSION_TYPE_NONE)
+ output_res_entry->flags = 0;
+ else
+ output_res_entry->flags = WIM_RESHDR_FLAG_COMPRESSED;
+ return 0;
+}
+
/*
* Reads the metadata metadata resource from the WIM file. The metadata
* resource consists of the security data, followed by the directory entry for
* @return: True on success, false on failure.
*/
int read_metadata_resource(FILE *fp, const struct resource_entry *res_entry,
- int wim_ctype, struct dentry **root_dentry_p)
+ int wim_ctype, struct image_metadata *image_metadata)
{
u8 *buf;
int ctype;
u32 dentry_offset;
int ret;
- struct dentry *dentry;
+ struct dentry *dentry = NULL;
DEBUG("Reading metadata resource: length = %lu, offset = %lu\n",
res_entry->original_size, res_entry->offset);
DEBUG("Finished reading metadata resource into memory.\n");
-#if 0
- /* Read the security data into a WIMSecurityData structure. */
- if (!read_security_data(buf, res_entry->original_size, sd))
- goto err1;
-#endif
dentry = MALLOC(sizeof(struct dentry));
if (!dentry) {
*
* The security data starts with a 4-byte integer giving its total
* length. */
+
+ /* Read the security data into a WIMSecurityData structure. */
+#ifdef ENABLE_SECURITY_DATA
+ ret = read_security_data(buf, res_entry->original_size,
+ &image_metadata->security_data);
+ if (ret != 0)
+ goto err1;
+#endif
get_u32(buf, &dentry_offset);
+ if (dentry_offset == 0)
+ dentry_offset = 8;
dentry_offset += (8 - dentry_offset % 8) % 8;
ret = read_dentry(buf, res_entry->original_size, dentry_offset, dentry);
if (ret != 0)
goto err2;
- *root_dentry_p = dentry;
+ image_metadata->root_dentry = dentry;
FREE(buf);
return ret;
err2:
return ret;
}
+/* Write the metadata resource for the current image. */
+int write_metadata_resource(WIMStruct *w)
+{
+ FILE *out;
+ u8 *buf;
+ u8 *p;
+ int ret;
+ off_t subdir_offset;
+ struct dentry *root;
+ struct lookup_table_entry *lte;
+ struct resource_entry *res_entry;
+ off_t metadata_offset;
+ u64 metadata_original_size;
+ u64 metadata_compressed_size;
+ int metadata_ctype;
+ u8 hash[WIM_HASH_SIZE];
+
+ DEBUG("Writing metadata resource for image %u\n", w->current_image);
+
+ out = w->out_fp;
+ root = wim_root_dentry(w);
+ metadata_ctype = wimlib_get_compression_type(w);
+ metadata_offset = ftello(out);
+ if (metadata_offset == -1)
+ return WIMLIB_ERR_WRITE;
+
+ #ifdef ENABLE_SECURITY_DATA
+ struct wim_security_data *sd = wim_security_data(w);
+ if (sd)
+ subdir_offset = sd->total_length + root->length + 8;
+ else
+ #endif
+ subdir_offset = 8 + root->length + 8;
+ calculate_subdir_offsets(root, &subdir_offset);
+ metadata_original_size = subdir_offset;
+ buf = MALLOC(metadata_original_size);
+ if (!buf) {
+ ERROR("Failed to allocate %"PRIu64" bytes for "
+ "metadata resource\n", metadata_original_size);
+ return WIMLIB_ERR_NOMEM;
+ }
+ #ifdef ENABLE_SECURITY_DATA
+ /* Write the security data. */
+ p = write_security_data(sd, buf);
+ #else
+ p = put_u32(buf, 8); /* Total length of security data. */
+ p = put_u32(p, 0); /* Number of security data entries. */
+ #endif
+
+ DEBUG("Writing dentry tree.\n");
+ p = write_dentry_tree(root, p);
+
+ /* Like file resources, the lookup table entry for a metadata resource
+ * uses for the hash code a SHA1 message digest of its uncompressed
+ * contents. */
+ sha1_buffer(buf, metadata_original_size, hash);
+
+ ret = write_resource_from_memory(buf,
+ metadata_ctype,
+ metadata_original_size,
+ out,
+ &metadata_compressed_size);
+ FREE(buf);
+ if (ret != 0)
+ return ret;
+
+ /* Update the lookup table entry, including the hash and output resource
+ * entry fields, for this image's metadata resource. */
+ lte = wim_metadata_lookup_table_entry(w);
+ res_entry = <e->output_resource_entry;
+ lte->out_refcnt++;
+ if (memcmp(hash, lte->hash, WIM_HASH_SIZE) != 0) {
+ lookup_table_unlink(w->lookup_table, lte);
+ memcpy(lte->hash, hash, WIM_HASH_SIZE);
+ lookup_table_insert(w->lookup_table, lte);
+ }
+ res_entry->original_size = metadata_original_size;
+ res_entry->offset = metadata_offset;
+ res_entry->size = metadata_compressed_size;
+ res_entry->flags = WIM_RESHDR_FLAG_METADATA;
+ if (metadata_ctype != WIM_COMPRESSION_TYPE_NONE)
+ res_entry->flags |= WIM_RESHDR_FLAG_COMPRESSED;
+ return 0;
+}
+
+/*
+ * Writes a file resource to the output file.
+ *
+ * @dentry: The dentry for the file resource.
+ * @wim_p: A pointer to the WIMStruct. The fields of interest to this
+ * function are the input and output file streams and the lookup table.
+ * @return zero on success, nonzero on failure.
+ */
+int write_file_resource(struct dentry *dentry, void *wim_p)
+{
+ WIMStruct *w;
+ FILE *out;
+ FILE *in;
+ struct lookup_table_entry *lte;
+ int in_wim_ctype;
+ int out_wim_ctype;
+ struct resource_entry *output_res_entry;
+ u64 len;
+ int ret;
+
+ w = wim_p;
+ out = w->out_fp;
+
+ /* Directories don't need file resources. */
+ if (dentry_is_directory(dentry))
+ return 0;
+
+ /* Get the lookup entry for the file resource. */
+ lte = wim_lookup_resource(w, dentry);
+ if (!lte)
+ return 0;
+
+ /* No need to write file resources twice. (This indicates file
+ * resources that are part of a hard link set.) */
+ if (++lte->out_refcnt != 1)
+ return 0;
+
+ out_wim_ctype = wimlib_get_compression_type(w);
+ output_res_entry = <e->output_resource_entry;
+
+ /* do not write empty resources */
+ if (lte->resource_entry.original_size == 0)
+ return 0;
+
+ /* Figure out if we can read the resource from the WIM file, or
+ * if we have to read it from the filesystem outside. */
+ if (lte->file_on_disk) {
+
+ /* Read from disk (uncompressed) */
+ len = lte->resource_entry.original_size;
+
+ in = fopen(lte->file_on_disk, "rb");
+ if (!in) {
+ ERROR("Failed to open the file `%s': %m\n",
+ lte->file_on_disk);
+ return WIMLIB_ERR_OPEN;
+ }
+
+ if (w->verbose)
+ puts(lte->file_on_disk);
+
+ ret = transfer_file_resource(in, len, len, 0,
+ WIM_COMPRESSION_TYPE_NONE, out,
+ out_wim_ctype, output_res_entry);
+ fclose(in);
+ } else {
+
+ /* Read from input WIM (possibly compressed) */
+
+ /* It may be a different WIM file, in the case of
+ * exporting images from one WIM file to another */
+ if (lte->other_wim_fp) {
+ /* Different WIM file. */
+ in = lte->other_wim_fp;
+ in_wim_ctype = lte->other_wim_ctype;
+ } else {
+ /* Same WIM file. */
+ in = w->fp;
+ in_wim_ctype = out_wim_ctype;
+ }
+ int input_res_ctype = resource_compression_type(
+ in_wim_ctype,
+ lte->resource_entry.flags);
+
+ ret = transfer_file_resource(in,
+ lte->resource_entry.size,
+ lte->resource_entry.original_size,
+ lte->resource_entry.offset,
+ input_res_ctype,
+ out,
+ out_wim_ctype,
+ output_res_entry);
+ }
+ return ret;
+}
git://wimlib.net / wimlib / blobdiff