* This file is part of wimlib, a library for working with WIM files.
*
* wimlib is free software; you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free
- * Software Foundation; either version 2.1 of the License, or (at your option)
+ * terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your option)
* any later version.
*
* wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+ * 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
+ * You should have received a copy of the GNU General Public License
* along with wimlib; if not, see http://www.gnu.org/licenses/.
*/
#include "wimlib_internal.h"
#include "lookup_table.h"
-#include "io.h"
+#include "buffer_io.h"
+#include <errno.h>
+
+#ifdef WITH_FUSE
+#include <unistd.h>
+#endif
struct lookup_table *new_lookup_table(size_t capacity)
{
struct lookup_table *table;
- struct lookup_table_entry **array;
+ struct hlist_head *array;
table = MALLOC(sizeof(struct lookup_table));
- if (!table)
- goto err;
- array = CALLOC(capacity, sizeof(array[0]));
- if (!array) {
- FREE(table);
- goto err;
+ if (table) {
+ array = CALLOC(capacity, sizeof(array[0]));
+ if (array) {
+ table->num_entries = 0;
+ table->capacity = capacity;
+ table->array = array;
+ } else {
+ FREE(table);
+ table = NULL;
+ ERROR("Failed to allocate memory for lookup table with capacity %zu",
+ capacity);
+ }
}
- table->num_entries = 0;
- table->capacity = capacity;
- table->array = array;
return table;
-err:
- ERROR("Failed to allocate memory for lookup table with capacity %zu",
- capacity);
- return NULL;
}
struct lookup_table_entry *new_lookup_table_entry()
{
struct lookup_table_entry *lte;
-
+
lte = CALLOC(1, sizeof(struct lookup_table_entry));
- if (!lte) {
+ if (lte) {
+ lte->part_number = 1;
+ lte->refcnt = 1;
+ } else {
ERROR("Out of memory (tried to allocate %zu bytes for "
"lookup table entry)",
sizeof(struct lookup_table_entry));
+ }
+ return lte;
+}
+
+struct lookup_table_entry *
+clone_lookup_table_entry(const struct lookup_table_entry *old)
+{
+ struct lookup_table_entry *new;
+
+ new = MALLOC(sizeof(*new));
+ if (!new)
return NULL;
+
+ memcpy(new, old, sizeof(*old));
+ new->extracted_file = NULL;
+ switch (new->resource_location) {
+ case RESOURCE_IN_STAGING_FILE:
+ case RESOURCE_IN_FILE_ON_DISK:
+ wimlib_assert((void*)&old->file_on_disk ==
+ (void*)&old->staging_file_name);
+ new->staging_file_name = STRDUP(old->staging_file_name);
+ if (!new->staging_file_name)
+ goto out_free;
+ break;
+ case RESOURCE_IN_ATTACHED_BUFFER:
+ new->attached_buffer = MALLOC(wim_resource_size(old));
+ if (!new->attached_buffer)
+ goto out_free;
+ memcpy(new->attached_buffer, old->attached_buffer,
+ wim_resource_size(old));
+ break;
+#ifdef WITH_NTFS_3G
+ case RESOURCE_IN_NTFS_VOLUME:
+ if (old->ntfs_loc) {
+ struct ntfs_location *loc;
+ loc = MALLOC(sizeof(*loc));
+ if (!loc)
+ goto out_free;
+ memcpy(loc, old->ntfs_loc, sizeof(*loc));
+ loc->path_utf8 = NULL;
+ loc->stream_name_utf16 = NULL;
+ new->ntfs_loc = loc;
+ loc->path_utf8 = STRDUP(old->ntfs_loc->path_utf8);
+ if (!loc->path_utf8)
+ goto out_free;
+ loc->stream_name_utf16 = MALLOC(loc->stream_name_utf16_num_chars * 2);
+ if (!loc->stream_name_utf16)
+ goto out_free;
+ memcpy(loc->stream_name_utf16,
+ old->ntfs_loc->stream_name_utf16,
+ loc->stream_name_utf16_num_chars * 2);
+ }
+ break;
+#endif
+ default:
+ break;
}
+ return new;
+out_free:
+ free_lookup_table_entry(new);
+ return NULL;
+}
- lte->part_number = 1;
- lte->refcnt = 1;
- return lte;
+void free_lookup_table_entry(struct lookup_table_entry *lte)
+{
+ if (lte) {
+ switch (lte->resource_location) {
+ case RESOURCE_IN_STAGING_FILE:
+ case RESOURCE_IN_ATTACHED_BUFFER:
+ case RESOURCE_IN_FILE_ON_DISK:
+ wimlib_assert(((void*)<e->file_on_disk ==
+ (void*)<e->staging_file_name)
+ && ((void*)<e->file_on_disk ==
+ (void*)<e->attached_buffer));
+ FREE(lte->file_on_disk);
+ break;
+#ifdef WITH_NTFS_3G
+ case RESOURCE_IN_NTFS_VOLUME:
+ if (lte->ntfs_loc) {
+ FREE(lte->ntfs_loc->path_utf8);
+ FREE(lte->ntfs_loc->stream_name_utf16);
+ FREE(lte->ntfs_loc);
+ }
+ break;
+#endif
+ default:
+ break;
+ }
+ FREE(lte);
+ }
}
+static int do_free_lookup_table_entry(struct lookup_table_entry *entry,
+ void *ignore)
+{
+ free_lookup_table_entry(entry);
+ return 0;
+}
+void free_lookup_table(struct lookup_table *table)
+{
+ DEBUG2("Freeing lookup table");
+ if (table) {
+ if (table->array) {
+ for_lookup_table_entry(table,
+ do_free_lookup_table_entry,
+ NULL);
+ FREE(table->array);
+ }
+ FREE(table);
+ }
+}
+
/*
* Inserts an entry into the lookup table.
*
- * @lookup_table: A pointer to the lookup table.
- * @entry: A pointer to the entry to insert.
+ * @table: A pointer to the lookup table.
+ * @entry: A pointer to the entry to insert.
*/
-void lookup_table_insert(struct lookup_table *table,
+void lookup_table_insert(struct lookup_table *table,
struct lookup_table_entry *lte)
{
- size_t pos;
- pos = lte->hash_short % table->capacity;
- lte->next = table->array[pos];
- table->array[pos] = lte;
+ size_t i = lte->hash_short % table->capacity;
+ hlist_add_head(<e->hash_list, &table->array[i]);
+
/* XXX Make the table grow when too many entries have been inserted. */
table->num_entries++;
}
-
-/* Unlinks a lookup table entry from the table; does not free it. */
-void lookup_table_unlink(struct lookup_table *table,
- struct lookup_table_entry *lte)
+static void finalize_lte(struct lookup_table_entry *lte)
{
- size_t pos;
- struct lookup_table_entry *prev, *cur_entry, *next;
-
- pos = lte->hash_short % table->capacity;
- prev = NULL;
- cur_entry = table->array[pos];
-
- while (cur_entry) {
- next = cur_entry->next;
- if (cur_entry == lte) {
- if (prev)
- prev->next = next;
- else
- table->array[pos] = next;
- table->num_entries--;
- return;
- }
- prev = cur_entry;
- cur_entry = next;
+ #ifdef WITH_FUSE
+ if (lte->resource_location == RESOURCE_IN_STAGING_FILE) {
+ unlink(lte->staging_file_name);
+ wimlib_assert(lte->staging_list.next);
+ wimlib_assert(lte->staging_list.prev);
+ list_del(<e->staging_list);
}
+ #endif
+ free_lookup_table_entry(lte);
}
-
-/* Decrement the reference count for the dentry having hash value @hash in the
- * lookup table. The lookup table entry is unlinked and freed if there are no
- * references to in remaining. */
-bool lookup_table_decrement_refcnt(struct lookup_table* table, const u8 hash[])
+/* Decrements the reference count for the lookup table entry @lte. If its
+ * reference count reaches 0, it is unlinked from the lookup table. If,
+ * furthermore, the entry has no opened file descriptors associated with it, the
+ * entry is freed. */
+void lte_decrement_refcnt(struct lookup_table_entry *lte,
+ struct lookup_table *table)
{
- size_t pos = *(size_t*)hash % table->capacity;
- struct lookup_table_entry *prev = NULL;
- struct lookup_table_entry *entry = table->array[pos];
- struct lookup_table_entry *next;
- while (entry) {
- next = entry->next;
- if (memcmp(hash, entry->hash, WIM_HASH_SIZE) == 0) {
- wimlib_assert(entry->refcnt != 0);
- if (--entry->refcnt == 0) {
- if (entry->staging_num_times_opened == 0)
- free_lookup_table_entry(entry);
- if (prev)
- prev->next = next;
- else
- table->array[pos] = next;
- return true;
- }
- }
- prev = entry;
- entry = next;
+ wimlib_assert(lte != NULL);
+ wimlib_assert(lte->refcnt != 0);
+ if (--lte->refcnt == 0) {
+ lookup_table_unlink(table, lte);
+ #ifdef WITH_FUSE
+ if (lte->num_opened_fds == 0)
+ #endif
+ finalize_lte(lte);
}
- return false;
}
+#ifdef WITH_FUSE
+void lte_decrement_num_opened_fds(struct lookup_table_entry *lte)
+{
+ wimlib_assert(lte != NULL);
+ if (lte->num_opened_fds != 0) {
+ if (--lte->num_opened_fds == 0 && lte->refcnt == 0)
+ finalize_lte(lte);
+ }
+}
+#endif
-/*
+/*
* Calls a function on all the entries in the lookup table. Stop early and
* return nonzero if any call to the function returns nonzero.
*/
-int for_lookup_table_entry(struct lookup_table *table,
+int for_lookup_table_entry(struct lookup_table *table,
int (*visitor)(struct lookup_table_entry *, void *),
void *arg)
{
- struct lookup_table_entry *entry, *next;
- size_t i;
+ struct lookup_table_entry *lte;
+ struct hlist_node *pos, *tmp;
int ret;
- for (i = 0; i < table->capacity; i++) {
- entry = table->array[i];
- while (entry) {
- next = entry->next;
- ret = visitor(entry, arg);
+ for (size_t i = 0; i < table->capacity; i++) {
+ hlist_for_each_entry_safe(lte, pos, tmp, &table->array[i],
+ hash_list)
+ {
+ ret = visitor(lte, arg);
if (ret != 0)
return ret;
- entry = next;
}
}
return 0;
/*
* Reads the lookup table from a WIM file.
- *
- * @fp: The FILE* for the WIM file.
- * @offset: The offset of the lookup table resource.
- * @size: The size of the lookup table resource.
- * @lookup_table_ret: A pointer to a struct lookup_table structure into which the
- * lookup table will be returned.
- * @return: True on success, false on failure.
*/
-int read_lookup_table(FILE *fp, u64 offset, u64 size,
- struct lookup_table **table_ret)
+int read_lookup_table(WIMStruct *w)
{
- size_t num_entries;
- u8 buf[WIM_LOOKUP_TABLE_ENTRY_DISK_SIZE];
- int ret;
+ u64 num_entries;
+ u8 buf[WIM_LOOKUP_TABLE_ENTRY_DISK_SIZE];
+ int ret;
struct lookup_table *table;
- const u8 *p;
- struct lookup_table_entry *cur_entry;
+ struct lookup_table_entry *cur_entry = NULL, *duplicate_entry;
+
+ if (resource_is_compressed(&w->hdr.lookup_table_res_entry)) {
+ ERROR("Didn't expect a compressed lookup table!");
+ ERROR("Ask the author to implement support for this.");
+ return WIMLIB_ERR_COMPRESSED_LOOKUP_TABLE;
+ }
DEBUG("Reading lookup table: offset %"PRIu64", size %"PRIu64"",
- offset, size);
+ w->hdr.lookup_table_res_entry.offset,
+ w->hdr.lookup_table_res_entry.original_size);
- if (fseeko(fp, offset, SEEK_SET) != 0) {
+ if (fseeko(w->fp, w->hdr.lookup_table_res_entry.offset, SEEK_SET) != 0)
+ {
ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" to read "
- "lookup table", offset);
+ "lookup table",
+ w->hdr.lookup_table_res_entry.offset);
return WIMLIB_ERR_READ;
}
- num_entries = size / WIM_LOOKUP_TABLE_ENTRY_DISK_SIZE;
+ num_entries = w->hdr.lookup_table_res_entry.original_size /
+ WIM_LOOKUP_TABLE_ENTRY_DISK_SIZE;
table = new_lookup_table(num_entries * 2 + 1);
if (!table)
return WIMLIB_ERR_NOMEM;
while (num_entries--) {
- if (fread(buf, 1, sizeof(buf), fp) != sizeof(buf)) {
- if (feof(fp)) {
+ const u8 *p;
+
+ if (fread(buf, 1, sizeof(buf), w->fp) != sizeof(buf)) {
+ if (feof(w->fp)) {
ERROR("Unexpected EOF in WIM lookup table!");
} else {
ERROR_WITH_ERRNO("Error reading WIM lookup "
ret = WIMLIB_ERR_NOMEM;
goto out;
}
-
+ cur_entry->wim = w;
+ cur_entry->resource_location = RESOURCE_IN_WIM;
+
p = get_resource_entry(buf, &cur_entry->resource_entry);
p = get_u16(p, &cur_entry->part_number);
p = get_u32(p, &cur_entry->refcnt);
- p = get_bytes(p, WIM_HASH_SIZE, cur_entry->hash);
+ p = get_bytes(p, SHA1_HASH_SIZE, cur_entry->hash);
+
+ if (cur_entry->part_number != w->hdr.part_number) {
+ ERROR("A lookup table entry in part %hu of the WIM "
+ "points to part %hu",
+ w->hdr.part_number, cur_entry->part_number);
+ ret = WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY;
+ goto out_free_cur_entry;
+ }
+
+ if (is_zero_hash(cur_entry->hash)) {
+ ERROR("The WIM lookup table contains an entry with a "
+ "SHA1 message digest of all 0's");
+ ret = WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY;
+ goto out_free_cur_entry;
+ }
+
+ /* Ordinarily, no two streams should share the same SHA1 message
+ * digest. However, this constraint can be broken for metadata
+ * resources--- two identical images will have the same metadata
+ * resource, but their lookup table entries are not shared. */
+ duplicate_entry = __lookup_resource(table, cur_entry->hash);
+ if (duplicate_entry
+ && !((duplicate_entry->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
+ && cur_entry->resource_entry.flags & WIM_RESHDR_FLAG_METADATA))
+ {
+ ERROR("The WIM lookup table contains two entries with the "
+ "same SHA1 message digest!");
+ ERROR("The first entry is:");
+ print_lookup_table_entry(duplicate_entry);
+ ERROR("The second entry is:");
+ print_lookup_table_entry(cur_entry);
+ ret = WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY;
+ goto out_free_cur_entry;
+ }
+
+ if (!(cur_entry->resource_entry.flags & WIM_RESHDR_FLAG_COMPRESSED)
+ && (cur_entry->resource_entry.size !=
+ cur_entry->resource_entry.original_size))
+ {
+ ERROR("Found uncompressed resource with original size "
+ "not the same as compressed size");
+ ERROR("The lookup table entry for the resource is as follows:");
+ print_lookup_table_entry(cur_entry);
+ ret = WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY;
+ goto out_free_cur_entry;
+ }
+ if ((cur_entry->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
+ && cur_entry->refcnt != 1)
+ {
+ ERROR("Found metadata resource with refcnt != 1:");
+ print_lookup_table_entry(cur_entry);
+ ret = WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY;
+ goto out_free_cur_entry;
+ }
lookup_table_insert(table, cur_entry);
+
}
DEBUG("Done reading lookup table.");
- *table_ret = table;
+ w->lookup_table = table;
return 0;
+out_free_cur_entry:
+ FREE(cur_entry);
out:
free_lookup_table(table);
return ret;
}
-/*
+/*
* Writes a lookup table entry to the output file.
*/
int write_lookup_table_entry(struct lookup_table_entry *lte, void *__out)
out = __out;
- /* do not write lookup table entries for empty files */
- if (lte->output_resource_entry.original_size == 0)
- return 0;
-
/* Don't write entries that have not had file resources or metadata
* resources written for them. */
if (lte->out_refcnt == 0)
return 0;
if (lte->output_resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
- DEBUG("Writing metadata entry at %lu", ftello(out));
+ DEBUG("Writing metadata entry at %lu (orig size = %zu)",
+ ftello(out), lte->output_resource_entry.original_size);
p = put_resource_entry(buf, <e->output_resource_entry);
p = put_u16(p, lte->part_number);
p = put_u32(p, lte->out_refcnt);
- p = put_bytes(p, WIM_HASH_SIZE, lte->hash);
+ p = put_bytes(p, SHA1_HASH_SIZE, lte->hash);
if (fwrite(buf, 1, sizeof(buf), out) != sizeof(buf)) {
ERROR_WITH_ERRNO("Failed to write lookup table entry");
return WIMLIB_ERR_WRITE;
return 0;
}
-static int do_free_lookup_table_entry(struct lookup_table_entry *entry,
- void *ignore)
+/* Writes the lookup table to the output file. */
+int write_lookup_table(struct lookup_table *table, FILE *out,
+ struct resource_entry *out_res_entry)
{
- free_lookup_table_entry(entry);
+ off_t start_offset, end_offset;
+ int ret;
+
+ start_offset = ftello(out);
+ if (start_offset == -1)
+ return WIMLIB_ERR_WRITE;
+
+ ret = for_lookup_table_entry(table, write_lookup_table_entry, out);
+ if (ret != 0)
+ return ret;
+
+ end_offset = ftello(out);
+ if (end_offset == -1)
+ return WIMLIB_ERR_WRITE;
+
+ out_res_entry->offset = start_offset;
+ out_res_entry->size = end_offset - start_offset;
+ out_res_entry->original_size = end_offset - start_offset;
+ out_res_entry->flags = WIM_RESHDR_FLAG_METADATA;
+
return 0;
}
-void free_lookup_table(struct lookup_table *table)
+
+int lte_zero_real_refcnt(struct lookup_table_entry *lte, void *ignore)
{
- if (!table)
- return;
- if (table->array) {
- for_lookup_table_entry(table, do_free_lookup_table_entry, NULL);
- FREE(table->array);
- }
- FREE(table);
+ lte->real_refcnt = 0;
+ return 0;
+}
+
+int lte_zero_out_refcnt(struct lookup_table_entry *lte, void *ignore)
+{
+ lte->out_refcnt = 0;
+ return 0;
}
-int zero_out_refcnts(struct lookup_table_entry *entry, void *ignore)
+int lte_zero_extracted_file(struct lookup_table_entry *lte, void *ignore)
{
- entry->out_refcnt = 0;
+ lte->extracted_file = NULL;
return 0;
}
-int print_lookup_table_entry(struct lookup_table_entry *entry, void *ignore)
+int lte_free_extracted_file(struct lookup_table_entry *lte, void *ignore)
{
- printf("Offset = %"PRIu64" bytes\n",
- entry->resource_entry.offset);
- printf("Size = %"PRIu64" bytes\n",
- (u64)entry->resource_entry.size);
- printf("Original size = %"PRIu64" bytes\n",
- entry->resource_entry.original_size);
- printf("Part Number = %hu\n", entry->part_number);
- printf("Reference Count = %u\n", entry->refcnt);
- printf("Hash = ");
- print_hash(entry->hash);
+ if (lte->extracted_file != NULL) {
+ FREE(lte->extracted_file);
+ lte->extracted_file = NULL;
+ }
+ return 0;
+}
+
+void print_lookup_table_entry(const struct lookup_table_entry *lte)
+{
+ if (!lte) {
+ putchar('\n');
+ return;
+ }
+ printf("Offset = %"PRIu64" bytes\n",
+ lte->resource_entry.offset);
+ printf("Size = %"PRIu64" bytes\n",
+ (u64)lte->resource_entry.size);
+ printf("Original size = %"PRIu64" bytes\n",
+ lte->resource_entry.original_size);
+ printf("Part Number = %hu\n", lte->part_number);
+ printf("Reference Count = %u\n", lte->refcnt);
+ printf("Hash = 0x");
+ print_hash(lte->hash);
putchar('\n');
printf("Flags = ");
- u8 flags = entry->resource_entry.flags;
+ u8 flags = lte->resource_entry.flags;
if (flags & WIM_RESHDR_FLAG_COMPRESSED)
fputs("WIM_RESHDR_FLAG_COMPRESSED, ", stdout);
if (flags & WIM_RESHDR_FLAG_FREE)
if (flags & WIM_RESHDR_FLAG_SPANNED)
fputs("WIM_RESHDR_FLAG_SPANNED, ", stdout);
putchar('\n');
- if (entry->file_on_disk)
- printf("File on Disk = `%s'\n", entry->file_on_disk);
+ switch (lte->resource_location) {
+ case RESOURCE_IN_WIM:
+ if (lte->wim->filename) {
+ printf("WIM file = `%s'\n",
+ lte->wim->filename);
+ }
+ break;
+ case RESOURCE_IN_FILE_ON_DISK:
+ printf("File on Disk = `%s'\n", lte->file_on_disk);
+ break;
+ case RESOURCE_IN_STAGING_FILE:
+ printf("Staging File = `%s'\n", lte->staging_file_name);
+ break;
+ default:
+ break;
+ }
putchar('\n');
+}
+
+static int do_print_lookup_table_entry(struct lookup_table_entry *lte,
+ void *ignore)
+{
+ print_lookup_table_entry(lte);
return 0;
}
/*
- * Prints the lookup table of a WIM file.
+ * Prints the lookup table of a WIM file.
*/
WIMLIBAPI void wimlib_print_lookup_table(WIMStruct *w)
{
- for_lookup_table_entry(w->lookup_table,
- print_lookup_table_entry, NULL);
+ for_lookup_table_entry(w->lookup_table,
+ do_print_lookup_table_entry,
+ NULL);
}
-/*
+/*
* Looks up an entry in the lookup table.
*/
struct lookup_table_entry *
-__lookup_resource(const struct lookup_table *lookup_table, const u8 hash[])
+__lookup_resource(const struct lookup_table *table, const u8 hash[])
{
- size_t pos;
+ size_t i;
struct lookup_table_entry *lte;
+ struct hlist_node *pos;
- pos = *(size_t*)hash % lookup_table->capacity;
- lte = lookup_table->array[pos];
- while (lte) {
- if (memcmp(hash, lte->hash, WIM_HASH_SIZE) == 0)
+ wimlib_assert(table != NULL);
+ wimlib_assert(hash != NULL);
+
+ i = *(size_t*)hash % table->capacity;
+ hlist_for_each_entry(lte, pos, &table->array[i], hash_list)
+ if (hashes_equal(hash, lte->hash))
return lte;
- lte = lte->next;
- }
return NULL;
}
+#ifdef WITH_FUSE
+/*
+ * Finds the dentry, lookup table entry, and stream index for a WIM file stream,
+ * given a path name.
+ *
+ * This is only for pre-resolved inodes.
+ */
int lookup_resource(WIMStruct *w, const char *path,
int lookup_flags,
struct dentry **dentry_ret,
struct lookup_table_entry **lte_ret,
- u8 **hash_ret)
+ u16 *stream_idx_ret)
{
- struct dentry *dentry = get_dentry(w, path);
+ struct dentry *dentry;
struct lookup_table_entry *lte;
- const u8 *hash;
+ u16 stream_idx;
+ const char *stream_name = NULL;
+ struct inode *inode;
+ char *p = NULL;
+
+ if (lookup_flags & LOOKUP_FLAG_ADS_OK) {
+ stream_name = path_stream_name(path);
+ if (stream_name) {
+ p = (char*)stream_name - 1;
+ *p = '\0';
+ }
+ }
+
+ dentry = get_dentry(w, path);
+ if (p)
+ *p = ':';
if (!dentry)
return -ENOENT;
+
+ inode = dentry->d_inode;
+
+ wimlib_assert(inode->resolved);
+
if (!(lookup_flags & LOOKUP_FLAG_DIRECTORY_OK)
- && dentry_is_directory(dentry))
+ && inode_is_directory(inode))
return -EISDIR;
- if (lookup_flags & LOOKUP_FLAG_ADS_OK) {
- const char *stream_name = path_stream_name(path);
- if (stream_name) {
- for (u16 i = 0; i < dentry->num_ads; i++) {
- if (strcmp(stream_name, dentry->ads_entries[i].stream_name) == 0) {
- hash = dentry->ads_entries[i].hash;
- goto do_lookup;
- }
- }
+
+ if (stream_name) {
+ struct ads_entry *ads_entry;
+ u16 ads_idx;
+ ads_entry = inode_get_ads_entry(inode, stream_name,
+ &ads_idx);
+ if (ads_entry) {
+ stream_idx = ads_idx + 1;
+ lte = ads_entry->lte;
+ goto out;
+ } else {
return -ENOENT;
}
+ } else {
+ lte = inode->lte;
+ stream_idx = 0;
}
- hash = dentry->hash;
-do_lookup:
- lte = __lookup_resource(w->lookup_table, hash);
+out:
if (dentry_ret)
*dentry_ret = dentry;
if (lte_ret)
*lte_ret = lte;
- if (hash_ret)
- *hash_ret = hash;
+ if (stream_idx_ret)
+ *stream_idx_ret = stream_idx;
return 0;
}
+#endif
+
+void inode_resolve_ltes(struct inode *inode, struct lookup_table *table)
+{
+
+ if (!inode->resolved) {
+ struct lookup_table_entry *lte;
+ /* Resolve the default file stream */
+ lte = __lookup_resource(table, inode->hash);
+ inode->lte = lte;
+ inode->resolved = 1;
+
+ /* Resolve the alternate data streams */
+ for (u16 i = 0; i < inode->num_ads; i++) {
+ struct ads_entry *cur_entry = &inode->ads_entries[i];
+ lte = __lookup_resource(table, cur_entry->hash);
+ cur_entry->lte = lte;
+ }
+ }
+}
+
+void inode_unresolve_ltes(struct inode *inode)
+{
+ if (inode->resolved) {
+ if (inode->lte)
+ copy_hash(inode->hash, inode->lte->hash);
+ else
+ zero_out_hash(inode->hash);
+
+ for (u16 i = 0; i < inode->num_ads; i++) {
+ if (inode->ads_entries[i].lte)
+ copy_hash(inode->ads_entries[i].hash,
+ inode->ads_entries[i].lte->hash);
+ else
+ zero_out_hash(inode->ads_entries[i].hash);
+ }
+ inode->resolved = 0;
+ }
+}
+
+/* Resolve a dentry's lookup table entries
+ *
+ * This replaces the SHA1 hash fields (which are used to lookup an entry in the
+ * lookup table) with pointers directly to the lookup table entries. A circular
+ * linked list of streams sharing the same lookup table entry is created.
+ *
+ * This function always succeeds; unresolved lookup table entries are given a
+ * NULL pointer.
+ */
+int dentry_resolve_ltes(struct dentry *dentry, void *table)
+{
+ wimlib_assert(dentry->refcnt == 1);
+ inode_resolve_ltes(dentry->d_inode, table);
+ return 0;
+}
+
+int dentry_unresolve_ltes(struct dentry *dentry, void *ignore)
+{
+ inode_unresolve_ltes(dentry->d_inode);
+ return 0;
+}
+
+/*
+ * Returns the lookup table entry for stream @stream_idx of the inode, where
+ * stream_idx = 0 means the default un-named file stream, and stream_idx >= 1
+ * corresponds to an alternate data stream.
+ *
+ * This works for both resolved and un-resolved dentries.
+ */
+struct lookup_table_entry *
+inode_stream_lte(const struct inode *inode, unsigned stream_idx,
+ const struct lookup_table *table)
+{
+ if (inode->resolved)
+ return inode_stream_lte_resolved(inode, stream_idx);
+ else
+ return inode_stream_lte_unresolved(inode, stream_idx, table);
+}
+
+
+/* Return the lookup table entry for the unnamed data stream of an inode, or
+ * NULL if there is none.
+ *
+ * You'd think this would be easier than it actually is, since the unnamed data
+ * stream should be the one referenced from the inode itself. Alas, if there
+ * are named data streams, Microsoft's "imagex.exe" program will put the unnamed
+ * data stream in one of the alternate data streams instead of inside the WIM
+ * dentry itself. So we need to check the alternate data streams too.
+ *
+ * Also, note that a dentry may appear to have more than one unnamed stream, but
+ * if the SHA1 message digest is all 0's then the corresponding stream does not
+ * really "count" (this is the case for the inode's own file stream when the
+ * file stream that should be there is actually in one of the alternate stream
+ * entries.). This is despite the fact that we may need to extract such a
+ * missing entry as an empty file or empty named data stream.
+ */
+struct lookup_table_entry *
+inode_unnamed_lte(const struct inode *inode,
+ const struct lookup_table *table)
+{
+ if (inode->resolved)
+ return inode_unnamed_lte_resolved(inode);
+ else
+ return inode_unnamed_lte_unresolved(inode, table);
+}
+
+static int lte_add_stream_size(struct lookup_table_entry *lte,
+ void *total_bytes_p)
+{
+ *(u64*)total_bytes_p += lte->resource_entry.size;
+ return 0;
+}
+
+u64 lookup_table_total_stream_size(struct lookup_table *table)
+{
+ u64 total_size = 0;
+ for_lookup_table_entry(table, lte_add_stream_size, &total_size);
+ return total_size;
+}
git://wimlib.net / wimlib / blobdiff