#define _WIMLIB_LOOKUP_TABLE_H
#include "wimlib_internal.h"
#include "dentry.h"
+#include "sha1.h"
#include <sys/types.h>
/* Size of each lookup table entry in the WIM file. */
#define LOOKUP_FLAG_ADS_OK 0x00000001
#define LOOKUP_FLAG_DIRECTORY_OK 0x00000002
-#define LOOKUP_FLAG_FOLLOW_SYMLINKS 0x00000004
+
+/* Not yet used */
+//#define LOOKUP_FLAG_FOLLOW_SYMLINKS 0x00000004
/* A lookup table that is used to translate the hash codes of dentries into the
* offsets and sizes of uncompressed or compressed file resources. It is
* implemented as a hash table. */
struct lookup_table {
- struct lookup_table_entry **array;
+ struct hlist_head *array;
u64 num_entries;
u64 capacity;
};
-/* An entry in the lookup table in the WIM file. */
+struct wimlib_fd;
+
+/*
+ * An entry in the lookup table in the WIM file.
+ *
+ * It is used to find data streams for files in the WIM.
+ *
+ * The lookup_table_entry for a given dentry in the WIM is found using the SHA1
+ * message digest field.
+ */
struct lookup_table_entry {
- /* The next struct lookup_table_entry in the hash bucket. NULL if this is the
- * last one. */
- struct lookup_table_entry *next;
+ /* List of lookup table entries in this hash bucket */
+ struct hlist_node hash_list;
/* @resource_entry is read from the lookup table in the WIM
* file; it says where to find the file resource in the WIM
/* Currently ignored; set to 1 in new lookup table entries. */
u16 part_number;
- /* Number of times this lookup table entry is referenced by dentries. */
- u32 refcnt;
-
/* If %true, this lookup table entry corresponds to a symbolic link
* reparse buffer. @symlink_reparse_data_buf will give the target of
* the symbolic link. */
- bool is_symlink;
+ enum {
+ RESOURCE_NONEXISTENT = 0,
+ RESOURCE_IN_WIM,
+ RESOURCE_IN_FILE_ON_DISK,
+ RESOURCE_IN_STAGING_FILE,
+ RESOURCE_IN_ATTACHED_BUFFER,
+ } resource_location;
+
+ /* Number of times this lookup table entry is referenced by dentries. */
+ u32 refcnt;
union {
/* SHA1 hash of the file resource pointed to by this lookup
* table entry */
- u8 hash[WIM_HASH_SIZE];
+ u8 hash[SHA1_HASH_SIZE];
/* First 4 or 8 bytes of the SHA1 hash, used for inserting the
* entry into the hash table. Since the SHA1 hashes can be
* It will not be compressed, and its size will be given by
* resource_entry.size and resource_entry.original_size. */
union {
+ WIMStruct *wim;
char *file_on_disk;
char *staging_file_name;
- void *symlink_buf;
- struct lookup_table_entry *next_lte_in_swm;
+ u8 *attached_buffer;
};
-
union {
- struct { /* Used for wimlib_export. */
-
- /* If (other_wim_fp != NULL), the file resource indicated
- * by this lookup table entry is in a different WIM
- * file, and other_wim_fp is the FILE* for it. */
- FILE *other_wim_fp;
-
- /* Compression type used in other WIM. */
- int other_wim_ctype;
- };
-
- struct { /* Used for read-write mounts. */
-
-
- /* Offset of the stream file_on_disk_fd. */
- off_t staging_offset;
-
-
- /* If file_on_disk_fd, if it is not -1, is the file
- * descriptor, opened for reading, for file_on_disk. */
- int staging_fd;
-
- /* Number of times the file has been opened.
- * file_on_disk_fd can be closed when num_times_opened
- * is decremented to 0. */
- int staging_num_times_opened;
- };
+ struct lookup_table_entry *next_lte_in_swm;
+ FILE *file_on_disk_fp;
};
+#ifdef WITH_FUSE
+ /* File descriptors table for this data stream */
+ u16 num_opened_fds;
+ u16 num_allocated_fds;
+ struct wimlib_fd **fds;
+#endif
/* When a WIM file is written, out_refcnt starts at 0 and is incremented
* whenever the file resource pointed to by this lookup table entry
*
* output_resource_entry is the struct resource_entry for the position of the
* file resource when written to the output file. */
+ u32 out_refcnt;
union {
- u32 out_refcnt;
- bool refcnt_is_incremented;
+ struct resource_entry output_resource_entry;
+ char *extracted_file;
};
- struct resource_entry output_resource_entry;
- struct dentry *hard_link_sets;
+
+ /* Circular linked list of streams that share the same lookup table
+ * entry
+ *
+ * This list of streams may include streams from different hard link
+ * sets that happen to be the same. */
+ struct list_head lte_group_list;
+
+ /* List of lookup table entries that correspond to streams that have
+ * been extracted to the staging directory when modifying a read-write
+ * mounted WIM. */
+ struct list_head staging_list;
};
+static inline u64 wim_resource_size(const struct lookup_table_entry *lte)
+{
+ return lte->resource_entry.original_size;
+}
+
+static inline u64
+wim_resource_compressed_size(const struct lookup_table_entry *lte)
+{
+ return lte->resource_entry.size;
+}
+
+/*
+ * XXX Probably should store the compression type directly in the lookup table
+ * entry
+ */
+static inline int
+wim_resource_compression_type(const struct lookup_table_entry *lte)
+{
+ if (!(lte->resource_entry.flags & WIM_RESHDR_FLAG_COMPRESSED)
+ || lte->resource_location != RESOURCE_IN_WIM)
+ return WIM_COMPRESSION_TYPE_NONE;
+ return wimlib_get_compression_type(lte->wim);
+}
+
+
extern struct lookup_table *new_lookup_table(size_t capacity);
extern void lookup_table_insert(struct lookup_table *table,
struct lookup_table_entry *lte);
-extern void lookup_table_unlink(struct lookup_table *table,
- struct lookup_table_entry *lte);
+/* Unlinks a lookup table entry from the table; does not free it. */
+static inline void lookup_table_unlink(struct lookup_table *table,
+ struct lookup_table_entry *lte)
+{
+ hlist_del(<e->hash_list);
+ table->num_entries--;
+}
+
+
+extern struct lookup_table_entry *
+lookup_table_decrement_refcnt(struct lookup_table* table, const u8 hash[]);
-extern bool lookup_table_decrement_refcnt(struct lookup_table* table,
- const u8 hash[]);
+extern struct lookup_table_entry *
+lte_decrement_refcnt(struct lookup_table_entry *lte,
+ struct lookup_table *table);
extern struct lookup_table_entry *new_lookup_table_entry();
void *arg);
extern 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[]);
extern int lookup_resource(WIMStruct *w, const char *path,
int lookup_flags, struct dentry **dentry_ret,
struct lookup_table_entry **lte_ret,
- u8 **hash_ret);
+ unsigned *stream_idx_ret);
extern int zero_out_refcnts(struct lookup_table_entry *entry, void *ignore);
-extern int print_lookup_table_entry(struct lookup_table_entry *entry, void *ignore);
+extern void print_lookup_table_entry(const struct lookup_table_entry *entry);
-extern int read_lookup_table(FILE *fp, u64 offset, u64 size,
- struct lookup_table **table_ret);
+extern int read_lookup_table(WIMStruct *w);
extern void free_lookup_table(struct lookup_table *table);
extern int write_lookup_table_entry(struct lookup_table_entry *lte, void *__out);
-static inline void free_lookup_table_entry(struct lookup_table_entry *lte)
-{
- if (lte) {
- FREE(lte->file_on_disk);
- FREE(lte);
- }
-}
+extern void free_lookup_table_entry(struct lookup_table_entry *lte);
+
+extern int dentry_resolve_ltes(struct dentry *dentry, void *__table);
/* Writes the lookup table to the output file. */
static inline int write_lookup_table(struct lookup_table *table, FILE *out)
w->current_image - 1].metadata_lte->resource_entry;
}
+static inline struct lookup_table_entry *
+dentry_stream_lte_resolved(const struct dentry *dentry, unsigned stream_idx)
+{
+ wimlib_assert(dentry->resolved);
+ wimlib_assert(stream_idx <= dentry->num_ads);
+ if (stream_idx == 0)
+ return dentry->lte;
+ else
+ return dentry->ads_entries[stream_idx - 1].lte;
+}
+
+static inline struct lookup_table_entry *
+dentry_stream_lte_unresolved(const struct dentry *dentry, unsigned stream_idx,
+ const struct lookup_table *table)
+{
+ wimlib_assert(!dentry->resolved);
+ wimlib_assert(stream_idx <= dentry->num_ads);
+ if (!table)
+ return NULL;
+ if (stream_idx == 0)
+ return __lookup_resource(table, dentry->hash);
+ else
+ return __lookup_resource(table,
+ dentry->ads_entries[
+ stream_idx - 1].hash);
+}
+/*
+ * Returns the lookup table entry for stream @stream_idx of the dentry, 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.
+ */
+static inline struct lookup_table_entry *
+dentry_stream_lte(const struct dentry *dentry, unsigned stream_idx,
+ const struct lookup_table *table)
+{
+ if (dentry->resolved)
+ return dentry_stream_lte_resolved(dentry, stream_idx);
+ else
+ return dentry_stream_lte_unresolved(dentry, stream_idx, table);
+}
+
+
+static inline const u8 *dentry_stream_hash_unresolved(const struct dentry *dentry,
+ unsigned stream_idx)
+{
+ wimlib_assert(!dentry->resolved);
+ wimlib_assert(stream_idx <= dentry->num_ads);
+ if (stream_idx == 0)
+ return dentry->hash;
+ else
+ return dentry->ads_entries[stream_idx - 1].hash;
+}
+
+static inline const u8 *dentry_stream_hash_resolved(const struct dentry *dentry,
+ unsigned stream_idx)
+{
+ struct lookup_table_entry *lte;
+ lte = dentry_stream_lte_resolved(dentry, stream_idx);
+ if (lte)
+ return lte->hash;
+ else
+ return NULL;
+}
+
+/*
+ * Returns the hash for stream @stream_idx of the dentry, 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.
+ */
+static inline const u8 *dentry_stream_hash(const struct dentry *dentry,
+ unsigned stream_idx)
+{
+ if (dentry->resolved)
+ return dentry_stream_hash_resolved(dentry, stream_idx);
+ else
+ return dentry_stream_hash_unresolved(dentry, stream_idx);
+}
+
+static inline struct lookup_table_entry *
+dentry_first_lte_resolved(const struct dentry *dentry)
+{
+ struct lookup_table_entry *lte;
+ wimlib_assert(dentry->resolved);
+
+ for (unsigned i = 0; i <= dentry->num_ads; i++) {
+ lte = dentry_stream_lte_resolved(dentry, i);
+ if (lte)
+ return lte;
+ }
+ return NULL;
+}
+
+static inline struct lookup_table_entry *
+dentry_first_lte_unresolved(const struct dentry *dentry,
+ const struct lookup_table *table)
+{
+ struct lookup_table_entry *lte;
+ wimlib_assert(!dentry->resolved);
+
+ for (unsigned i = 0; i <= dentry->num_ads; i++) {
+ lte = dentry_stream_lte_unresolved(dentry, i, table);
+ if (lte)
+ return lte;
+ }
+ return NULL;
+}
+
+extern struct lookup_table_entry *
+dentry_first_lte(const struct dentry *dentry, const struct lookup_table *table);
+
#endif
git://wimlib.net / wimlib / blobdiff