X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Flookup_table.c;h=67ce92a3f37b79617ac2a9c370e5980c0fe18f9a;hp=e0fca5d47ea1cb596b5ffc65c30d86cb1f8548da;hb=c92b18f7074e6d632c555bed5897c5723abde720;hpb=50670821723291959a6f35442c523800d369c934

diff --git a/src/lookup_table.c b/src/lookup_table.c
index e0fca5d4..67ce92a3 100644
--- a/src/lookup_table.c
+++ b/src/lookup_table.c
@@ -26,7 +26,7 @@
 
 #include "wimlib_internal.h"
 #include "lookup_table.h"
-#include "io.h"
+#include "buffer_io.h"
 #include <errno.h>
 
 #ifdef WITH_FUSE
@@ -39,40 +39,97 @@ struct lookup_table *new_lookup_table(size_t capacity)
 	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 NULL;
 	}
-
-	lte->part_number  = 1;
-	lte->refcnt       = 1;
 	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;
+}
+
 void free_lookup_table_entry(struct lookup_table_entry *lte)
 {
 	if (lte) {
@@ -98,7 +155,6 @@ void free_lookup_table_entry(struct lookup_table_entry *lte)
 		default:
 			break;
 		}
-		FREE(lte->extracted_file);
 		FREE(lte);
 	}
 }
@@ -131,7 +187,7 @@ void free_lookup_table(struct lookup_table *table)
  * @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 i = lte->hash_short % table->capacity;
@@ -147,6 +203,7 @@ static void finalize_lte(struct lookup_table_entry *lte)
 	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(&lte->staging_list);
 	}
 	#endif
@@ -157,47 +214,36 @@ static void finalize_lte(struct lookup_table_entry *lte)
  * 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.  */
-struct lookup_table_entry *
-lte_decrement_refcnt(struct lookup_table_entry *lte, struct lookup_table *table)
+void lte_decrement_refcnt(struct lookup_table_entry *lte,
+			  struct lookup_table *table)
 {
-	if (lte) {
-		wimlib_assert(lte->refcnt);
-		if (--lte->refcnt == 0) {
-			lookup_table_unlink(table, lte);
-		#ifdef WITH_FUSE
-			if (lte->num_opened_fds == 0)
-		#endif
-			{
-				finalize_lte(lte);
-				lte = NULL;
-			}
-		}
+	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 lte;
 }
 
 #ifdef WITH_FUSE
-struct lookup_table_entry *
-lte_decrement_num_opened_fds(struct lookup_table_entry *lte,
-			     struct lookup_table *table)
+void lte_decrement_num_opened_fds(struct lookup_table_entry *lte)
 {
-	if (lte) {
-		wimlib_assert(lte->num_opened_fds);
-		if (--lte->num_opened_fds == 0 && lte->refcnt == 0) {
-			lookup_table_unlink(table, lte);
+	wimlib_assert(lte != NULL);
+	if (lte->num_opened_fds != 0) {
+		if (--lte->num_opened_fds == 0 && lte->refcnt == 0)
 			finalize_lte(lte);
-			lte = NULL;
-		}
 	}
-	return 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)
 {
@@ -223,17 +269,24 @@ int for_lookup_table_entry(struct lookup_table *table,
  */
 int read_lookup_table(WIMStruct *w)
 {
-	u64    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;
 	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"",
 	      w->hdr.lookup_table_res_entry.offset,
 	      w->hdr.lookup_table_res_entry.original_size);
 
-	if (fseeko(w->fp, w->hdr.lookup_table_res_entry.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",
 				 w->hdr.lookup_table_res_entry.offset);
@@ -266,7 +319,7 @@ int read_lookup_table(WIMStruct *w)
 		}
 		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);
@@ -278,7 +331,6 @@ int read_lookup_table(WIMStruct *w)
 			      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)) {
@@ -288,8 +340,15 @@ int read_lookup_table(WIMStruct *w)
 			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) {
+		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:");
@@ -302,7 +361,7 @@ int read_lookup_table(WIMStruct *w)
 
 		if (!(cur_entry->resource_entry.flags & WIM_RESHDR_FLAG_COMPRESSED)
 		    && (cur_entry->resource_entry.size !=
-		      cur_entry->resource_entry.original_size))
+		        cur_entry->resource_entry.original_size))
 		{
 			ERROR("Found uncompressed resource with original size "
 			      "not the same as compressed size");
@@ -311,6 +370,14 @@ int read_lookup_table(WIMStruct *w)
 			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);
 
 	}
@@ -325,7 +392,7 @@ out:
 }
 
 
-/* 
+/*
  * Writes a lookup table entry to the output file.
  */
 int write_lookup_table_entry(struct lookup_table_entry *lte, void *__out)
@@ -356,6 +423,33 @@ int write_lookup_table_entry(struct lookup_table_entry *lte, void *__out)
 	return 0;
 }
 
+/* Writes the lookup table to the output file. */
+int write_lookup_table(struct lookup_table *table, FILE *out,
+		       struct resource_entry *out_res_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;
+}
+
 
 int lte_zero_real_refcnt(struct lookup_table_entry *lte, void *ignore)
 {
@@ -369,24 +463,32 @@ int lte_zero_out_refcnt(struct lookup_table_entry *lte, void *ignore)
 	return 0;
 }
 
-int lte_free_extracted_file(struct lookup_table_entry *lte, void *ignone)
+int lte_zero_extracted_file(struct lookup_table_entry *lte, void *ignore)
 {
-	FREE(lte->extracted_file);
 	lte->extracted_file = NULL;
 	return 0;
 }
 
+int lte_free_extracted_file(struct lookup_table_entry *lte, void *ignore)
+{
+	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", 
+	printf("Offset            = %"PRIu64" bytes\n",
 	       lte->resource_entry.offset);
-	printf("Size              = %"PRIu64" bytes\n", 
+	printf("Size              = %"PRIu64" bytes\n",
 	       (u64)lte->resource_entry.size);
-	printf("Original size     = %"PRIu64" bytes\n", 
+	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);
@@ -431,16 +533,16 @@ static int do_print_lookup_table_entry(struct lookup_table_entry *lte,
 }
 
 /*
- * 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, 
+	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 *
@@ -450,6 +552,9 @@ __lookup_resource(const struct lookup_table *table, const u8 hash[])
 	struct lookup_table_entry *lte;
 	struct hlist_node *pos;
 
+	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))
@@ -458,7 +563,7 @@ __lookup_resource(const struct lookup_table *table, const u8 hash[])
 }
 
 #ifdef WITH_FUSE
-/* 
+/*
  * Finds the dentry, lookup table entry, and stream index for a WIM file stream,
  * given a path name.
  *
@@ -491,7 +596,7 @@ int lookup_resource(WIMStruct *w, const char *path,
 	if (!dentry)
 		return -ENOENT;
 
-	inode = dentry->inode;
+	inode = dentry->d_inode;
 
 	wimlib_assert(inode->resolved);
 
@@ -526,24 +631,45 @@ out:
 }
 #endif
 
-static void inode_resolve_ltes(struct inode *inode, struct lookup_table *table)
+void inode_resolve_ltes(struct inode *inode, struct lookup_table *table)
 {
-	struct lookup_table_entry *lte;
 
-	/* Resolve the default file stream */
-	lte = __lookup_resource(table, inode->hash);
-	inode->lte = lte;
-	inode->resolved = true;
+	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;
+		}
+	}
+}
 
-	/* 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 
+/* 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
@@ -554,11 +680,35 @@ static void inode_resolve_ltes(struct inode *inode, struct lookup_table *table)
  */
 int dentry_resolve_ltes(struct dentry *dentry, void *table)
 {
-	if (!dentry->inode->resolved)
-		inode_resolve_ltes(dentry->inode, 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.
  *
@@ -568,8 +718,8 @@ int dentry_resolve_ltes(struct dentry *dentry, void *table)
  * 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 than one unnamed stream, but if
- * the SHA1 message digest is all 0's then the corresponding stream does not
+ * 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
@@ -577,7 +727,7 @@ int dentry_resolve_ltes(struct dentry *dentry, void *table)
  */
 struct lookup_table_entry *
 inode_unnamed_lte(const struct inode *inode,
-		   const struct lookup_table *table)
+		  const struct lookup_table *table)
 {
 	if (inode->resolved)
 		return inode_unnamed_lte_resolved(inode);
@@ -585,3 +735,16 @@ inode_unnamed_lte(const struct inode *inode,
 		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;
+}