1 #ifndef _WIMLIB_LOOKUP_TABLE_H
2 #define _WIMLIB_LOOKUP_TABLE_H
3 #include "wimlib_internal.h"
7 /* Size of each lookup table entry in the WIM file. */
8 #define WIM_LOOKUP_TABLE_ENTRY_DISK_SIZE 50
10 #define LOOKUP_FLAG_ADS_OK
13 /* A lookup table that is used to translate the hash codes of dentries into the
14 * offsets and sizes of uncompressed or compressed file resources. It is
15 * implemented as a hash table. */
17 struct lookup_table_entry **array;
22 /* An entry in the lookup table in the WIM file. */
23 struct lookup_table_entry {
25 /* The next struct lookup_table_entry in the hash bucket. NULL if this is the
27 struct lookup_table_entry *next;
29 /* @resource_entry is read from the lookup table in the WIM
30 * file; it says where to find the file resource in the WIM
31 * file, and whether it is compressed or not. */
32 struct resource_entry resource_entry;
34 /* Currently ignored; set to 1 in new lookup table entries. */
37 /* Number of times this lookup table entry is referenced by dentries. */
40 /* If %true, this lookup table entry corresponds to a symbolic link
41 * reparse buffer. @symlink_reparse_data_buf will give the target of
42 * the symbolic link. */
46 /* SHA1 hash of the file resource pointed to by this lookup
48 u8 hash[WIM_HASH_SIZE];
50 /* First 4 or 8 bytes of the SHA1 hash, used for inserting the
51 * entry into the hash table. Since the SHA1 hashes can be
52 * considered random, we don't really need the full 20 byte hash
53 * just to insert the entry in a hash table. */
57 /* If @file_on_disk != NULL, the file resource indicated by this lookup
58 * table entry is not in the WIM file, but rather a file on disk; this
59 * occurs for files that are added to the WIM. In that case,
60 * file_on_disk is the name of the file in the outside filesystem.
61 * It will not be compressed, and its size will be given by
62 * resource_entry.size and resource_entry.original_size. */
65 char *staging_file_name;
67 struct lookup_table_entry *next_lte_in_swm;
71 struct { /* Used for wimlib_export. */
73 /* If (other_wim_fp != NULL), the file resource indicated
74 * by this lookup table entry is in a different WIM
75 * file, and other_wim_fp is the FILE* for it. */
78 /* Compression type used in other WIM. */
82 struct { /* Used for read-write mounts. */
85 /* Offset of the stream file_on_disk_fd. */
89 /* If file_on_disk_fd, if it is not -1, is the file
90 * descriptor, opened for reading, for file_on_disk. */
93 /* Number of times the file has been opened.
94 * file_on_disk_fd can be closed when num_times_opened
95 * is decremented to 0. */
96 int staging_num_times_opened;
100 /* When a WIM file is written, out_refcnt starts at 0 and is incremented
101 * whenever the file resource pointed to by this lookup table entry
102 * needs to be written. Naturally, the file resource only need to be
103 * written when out_refcnt is 0. Incrementing it further is needed to
104 * find the correct reference count to write to the lookup table in the
105 * output file, which may be less than the regular refcnt if not all
106 * images in the WIM file are written.
108 * output_resource_entry is the struct resource_entry for the position of the
109 * file resource when written to the output file. */
112 bool refcnt_is_incremented;
114 struct resource_entry output_resource_entry;
117 extern struct lookup_table *new_lookup_table(size_t capacity);
119 extern void lookup_table_insert(struct lookup_table *table,
120 struct lookup_table_entry *lte);
122 extern void lookup_table_unlink(struct lookup_table *table,
123 struct lookup_table_entry *lte);
125 extern void lookup_table_decrement_refcnt(struct lookup_table* table,
129 extern struct lookup_table_entry *new_lookup_table_entry();
131 extern int for_lookup_table_entry(struct lookup_table *table,
132 int (*visitor)(struct lookup_table_entry *, void *),
135 extern struct lookup_table_entry *lookup_resource(const struct lookup_table *table,
138 static inline struct lookup_table_entry *
139 wim_lookup_resource(const WIMStruct *w, const struct dentry *dentry)
141 return lookup_resource(w->lookup_table, dentry->hash);
145 extern int zero_out_refcnts(struct lookup_table_entry *entry, void *ignore);
147 extern int print_lookup_table_entry(struct lookup_table_entry *entry, void *ignore);
149 extern int read_lookup_table(FILE *fp, u64 offset, u64 size,
150 struct lookup_table **table_ret);
152 extern void free_lookup_table(struct lookup_table *table);
154 extern int write_lookup_table_entry(struct lookup_table_entry *lte, void *__out);
156 static inline void free_lookup_table_entry(struct lookup_table_entry *lte)
159 FREE(lte->file_on_disk);
164 /* Writes the lookup table to the output file. */
165 static inline int write_lookup_table(struct lookup_table *table, FILE *out)
167 return for_lookup_table_entry(table, write_lookup_table_entry, out);
170 /* Unlinks and frees an entry from a lookup table. */
171 static inline void lookup_table_remove(struct lookup_table *table,
172 struct lookup_table_entry *lte)
174 lookup_table_unlink(table, lte);
175 free_lookup_table_entry(lte);
178 static inline struct resource_entry* wim_metadata_resource_entry(WIMStruct *w)
180 return &w->image_metadata[
181 w->current_image - 1].metadata_lte->resource_entry;