#include <errno.h>
#include <alloca.h>
+#ifdef WITH_NTFS_3G
+#include <ntfs-3g/attrib.h>
+#include <ntfs-3g/inode.h>
+#include <ntfs-3g/dir.h>
+#endif
/*
* Reads all or part of a compressed resource into an in-memory buffer.
wimlib_assert(lte->wim->fp);
ctype = wim_resource_compression_type(lte);
- /* XXX This check should be moved elsewhere */
- if (ctype == WIM_COMPRESSION_TYPE_NONE &&
- lte->resource_entry.original_size !=
- lte->resource_entry.size) {
- ERROR("WIM resource at offset %"PRIu64", size %"PRIu64
- "has an original size of %"PRIu64", but is "
- "uncompressed",
- lte->resource_entry.offset,
- lte->resource_entry.size,
- lte->resource_entry.original_size);
- return WIMLIB_ERR_INVALID_RESOURCE_SIZE;
- }
+ wimlib_assert(ctype != WIM_COMPRESSION_TYPE_NONE ||
+ (lte->resource_entry.original_size ==
+ lte->resource_entry.size));
if (raw || ctype == WIM_COMPRESSION_TYPE_NONE)
return read_uncompressed_resource(lte->wim->fp,
ctype, size, offset, buf);
break;
case RESOURCE_IN_STAGING_FILE:
- /* The WIM FUSE implementation needs to handle multiple open
- * file descriptors per lookup table entry so it does not
- * currently work with this function. */
- wimlib_assert(lte->staging_file_name);
- wimlib_assert(0);
- break;
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) {
memcpy(buf, lte->attached_buffer + offset, size);
return 0;
break;
+#ifdef WITH_NTFS_3G
+ case RESOURCE_IN_NTFS_VOLUME:
+ if (lte->attr) {
+ if (ntfs_attr_pread(lte->attr, offset, size, buf) == size) {
+ return 0;
+ } else {
+ ERROR_WITH_ERRNO("Error reading NTFS attribute "
+ "at `%s'",
+ lte->ntfs_loc->path_utf8);
+ return WIMLIB_ERR_NTFS_3G;
+ }
+ } else {
+ wimlib_assert(0);
+ }
+ break;
+#endif
default:
assert(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
struct chunk_table *chunk_tab = NULL;
bool raw;
off_t file_offset;
+#ifdef WITH_NTFS_3G
+ ntfs_inode *ni;
+#endif
+ /* 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 "
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)
else
bytes_remaining = original_size;
+ /* Empty resource; nothing needs to be done, so just return success. */
if (bytes_remaining == 0)
return 0;
+ /* Buffer for reading chunks for the resource */
char 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);
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)
{
- /* The WIM resource is in an external file; open a FILE * to it
- * so we don't have to open a temporary one on every read. */
wimlib_assert(lte->file_on_disk);
lte->file_on_disk_fp = fopen(lte->file_on_disk, "rb");
if (!lte->file_on_disk_fp) {
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);
+ }
+ 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) {
+ ntfs_inode_close(ni);
+ ERROR_WITH_ERRNO("Failed to open attribute of `%s' in "
+ "NTFS volume", loc->path_utf8);
+ }
+ }
+#endif
+
+ /* 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. */
do {
u64 to_read = min(bytes_remaining, WIM_CHUNK_SIZE);
ret = read_wim_resource(lte, buf, to_read, offset, raw);
bytes_remaining -= to_read;
offset += to_read;
} while (bytes_remaining);
+
+ /* If writing a compressed resource and not doing a raw copy, write the
+ * chunk table, and finish_wim_resource_chunk_tab() will provide the
+ * compressed size of the resource we wrote. Otherwise, the compressed
+ * size of the written resource is the same as the compressed size of
+ * the existing resource. */
if (out_ctype != WIM_COMPRESSION_TYPE_NONE && !raw) {
ret = finish_wim_resource_chunk_tab(chunk_tab, out_fp,
&new_compressed_size);
new_compressed_size = old_compressed_size;
}
+ /* 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) {
- /* Verify SHA1 message digest of the resource, unless we are
- * doing a raw write (in which case we may have never even seen
- * the uncompressed data) */
u8 md[SHA1_HASH_SIZE];
sha1_final(md, &ctx);
- if (!hashes_equal(md, lte->hash)) {
+ 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 "
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
+ && lte->attr) {
+ ntfs_attr_close(lte->attr);
+ ntfs_inode_close(ni);
+ }
+#endif
out:
FREE(chunk_tab);
return ret;
}
+/* 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,
- u8 buf_hash[SHA1_HASH_SIZE],
FILE *out_fp, int out_ctype,
- struct resource_entry *out_res_entry)
+ struct resource_entry *out_res_entry,
+ u8 hash[SHA1_HASH_SIZE])
{
+ /* Set up a temporary lookup table entry that we 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;
- copy_hash(lte.hash, buf_hash);
- return write_wim_resource(<e, out_fp, out_ctype, out_res_entry);
+
+ zero_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;
}
/*
/*
* Copies the file resource specified by the lookup table entry @lte from the
- * input WIM the output WIM.
+ * 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.
return ret;
}
-/* Write the metadata resource for the current image. */
+/* Write the metadata resource for the current WIM 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;
+ struct lookup_table_entry *lte, *duplicate_lte;
u64 metadata_original_size;
- u64 metadata_compressed_size;
- int metadata_ctype;
- u8 hash[SHA1_HASH_SIZE];
+
+ /*
+ * We append 20 random bytes to the metadata resource so that we don't
+ * have identical metadata resources if we happen to append exactly the
+ * same image twice without any changes in timestamps. If this were to
+ * happen, it would cause confusion about the number and order of images
+ * in the WIM.
+ */
+ const unsigned random_tail_len = 20;
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;
+ const struct wim_security_data *sd = wim_security_data(w);
+ wimlib_assert(sd);
+ subdir_offset = sd->total_length + root->length + 8;
calculate_subdir_offsets(root, &subdir_offset);
- metadata_original_size = subdir_offset;
+ metadata_original_size = subdir_offset + random_tail_len;
buf = MALLOC(metadata_original_size);
if (!buf) {
ERROR("Failed to allocate %"PRIu64" bytes for "
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);
-
+ randomize_byte_array(p, random_tail_len);
+ wimlib_assert(p - buf + random_tail_len == metadata_original_size);
lte = wim_metadata_lookup_table_entry(w);
ret = write_wim_resource_from_buffer(buf, metadata_original_size,
- hash, out, metadata_ctype,
- <e->output_resource_entry);
-
+ w->out_fp,
+ wimlib_get_compression_type(w),
+ <e->output_resource_entry,
+ lte->hash);
lookup_table_unlink(w->lookup_table, lte);
- copy_hash(lte->hash, hash);
lookup_table_insert(w->lookup_table, lte);
- lte->out_refcnt++;
+ wimlib_assert(lte->out_refcnt == 0);
+ lte->out_refcnt = 1;
lte->output_resource_entry.flags |= WIM_RESHDR_FLAG_METADATA;
+out:
FREE(buf);
- if (ret != 0)
- return ret;
-
- return 0;
+ return ret;
}
git://wimlib.net / wimlib / blobdiff