X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fdentry.h;h=b6aa966f0501f2d568f879bcfc17c0ee3385c1d8;hp=6c260fc2538f37f305b84c49f2d022156ada4938;hb=0dd190af48ac572f9e33ff9436ec8900fa6281a3;hpb=0e4862eb6d10b7266240fe29ed1ecbd2ad5b0f36 diff --git a/src/dentry.h b/src/dentry.h index 6c260fc2..b6aa966f 100644 --- a/src/dentry.h +++ b/src/dentry.h @@ -3,18 +3,26 @@ #include "util.h" #include "config.h" +#include "list.h" #include + +struct stat; +struct lookup_table; +typedef struct WIMStruct WIMStruct; + /* Size of the struct dentry up to and including the file_name_len. */ #define WIM_DENTRY_DISK_SIZE 102 #define WIM_ADS_ENTRY_DISK_SIZE 38 +#ifndef WIM_HASH_SIZE +#define WIM_HASH_SIZE 20 +#endif + /* * Reparse tags documented at * http://msdn.microsoft.com/en-us/library/dd541667(v=prot.10).aspx - * - * IO_REPARSE_TAG_SYMLINK is the only one we really care about. */ #define WIM_IO_REPARSE_TAG_RESERVED_ZERO 0x00000000 #define WIM_IO_REPARSE_TAG_RESERVED_ONE 0x00000001 @@ -44,22 +52,32 @@ #define FILE_ATTRIBUTE_ENCRYPTED 0x00004000 #define FILE_ATTRIBUTE_VIRTUAL 0x00010000 +struct lookup_table_entry; + /* Alternate data stream entry */ struct ads_entry { - /* SHA-1 message digest of stream contents */ - u8 hash[WIM_HASH_SIZE]; + union { + /* SHA-1 message digest of stream contents */ + u8 hash[WIM_HASH_SIZE]; + + /* The corresponding lookup table entry (only for resolved + * streams) */ + struct lookup_table_entry *lte; + }; /* Length of stream name (UTF-16) */ u16 stream_name_len; /* Length of stream name (UTF-8) */ - u16 stream_name_len_utf8; + u16 stream_name_utf8_len; /* Stream name (UTF-16) */ char *stream_name; /* Stream name (UTF-8) */ char *stream_name_utf8; + + struct stream_list_head lte_group_list; }; static inline u64 ads_entry_length(const struct ads_entry *entry) @@ -68,6 +86,22 @@ static inline u64 ads_entry_length(const struct ads_entry *entry) return (len + 7) & ~7; } +static inline void destroy_ads_entry(struct ads_entry *entry) +{ + FREE(entry->stream_name); + FREE(entry->stream_name_utf8); + memset(entry, 0, sizeof(entry)); +} + +static inline bool ads_entry_has_name(const struct ads_entry *entry, + const char *name, size_t name_len) +{ + if (entry->stream_name_utf8_len != name_len) + return false; + return memcmp(entry->stream_name_utf8, name, name_len) == 0; +} + + /* In-memory structure for a directory entry. There is a directory tree for * each image in the WIM. */ struct dentry { @@ -90,7 +124,6 @@ struct dentry { * included only the length field, but that takes up 8 bytes. */ u64 length; - /* The file attributes associated with this file. */ u32 attributes; @@ -103,10 +136,6 @@ struct dentry { * entry's child files. 0 if the directory entry has no children. */ u64 subdir_offset; - /* Reserved for future disuse. Currently ignoring these fields. */ - u64 unused1; - u64 unused2; - /* Timestamps for the entry. The timestamps are the number of * 100-nanosecond intervals that have elapsed since 12:00 A.M., January * 1st, 1601, UTC. */ @@ -114,8 +143,20 @@ struct dentry { u64 last_access_time; u64 last_write_time; - /* A hash of the file's contents. */ - u8 hash[WIM_HASH_SIZE]; + /* true if the dentry's lookup table entry has been resolved (i.e. the + * @lte field is invalid, but the @hash field is not valid) */ + bool resolved; + + /* A hash of the file's contents, or a pointer to the lookup table entry + * for this dentry if the lookup table entries have been resolved. + * + * More specifically, this is for the un-named default file stream, as + * opposed to the alternate file streams, which may have their own + * lookup table entries. */ + union { + u8 hash[WIM_HASH_SIZE]; + struct lookup_table_entry *lte; + }; /* Identity of a reparse point. See * http://msdn.microsoft.com/en-us/library/windows/desktop/aa365503(v=vs.85).aspx @@ -129,14 +170,6 @@ struct dentry { * read_dentry() function. */ //u32 reparse_reserved; - /* If the reparse_reserved field existed, there would be a 4-byte gap - * here to align hard_link on an 8-byte field. However, - * reparse_reserved does not actually exist, so there is no gap here. */ - - /* If the file is part of a hard link set, all the directory entries in - * the set will share the same value for this field. */ - u64 hard_link; - /* Number of alternate data streams associated with this file. */ u16 num_ads; @@ -168,14 +201,49 @@ struct dentry { /* Alternate stream entries for this dentry. */ struct ads_entry *ads_entries; - /* Number of references to the dentry tree itself, as in multiple - * WIMStructs */ - int refcnt; + union { + /* Number of references to the dentry tree itself, as in multiple + * WIMStructs */ + int refcnt; + + /* Number of times this dentry has been opened (only for + * directories!) */ + u32 num_times_opened; + }; + + /* If the file is part of a hard link set, all the directory entries in + * the set will share the same value for this field. */ + u64 hard_link; + + enum { + /* This dentry is the owner of its ads_entries, although it may + * be in a hard link set */ + GROUP_INDEPENDENT = 0, + + /* This dentry is the owner of the ads_entries in the hard link + * set */ + GROUP_MASTER, + + /* This dentry shares its ads_entries with a dentry in the hard + * link set that has GROUP_MASTER set. */ + GROUP_SLAVE + } link_group_master_status; + + + /* List of dentries in the hard link set */ + struct list_head link_group_list; + + /* List of dentries sharing the same lookup table entry */ + struct stream_list_head lte_group_list; + + /* Path to extracted file on disk (used during extraction only) */ + char *extracted_file; }; /* Return hash of the "unnamed" (default) data stream. */ static inline const u8 *dentry_hash(const struct dentry *dentry) { + wimlib_assert(!dentry->resolved); /* If there are alternate data streams, the dentry hash field is zeroed * out, and we need to find the hash in the un-named data stream (should * be the first one, but check them in order just in case, and fall back @@ -186,13 +254,43 @@ static inline const u8 *dentry_hash(const struct dentry *dentry) return dentry->hash; } +/* Return lte for the "unnamed" (default) data stream. Only for resolved + * dentries */ +static inline struct lookup_table_entry * +dentry_lte(const struct dentry *dentry) +{ + wimlib_assert(dentry->resolved); + for (u16 i = 0; i < dentry->num_ads; i++) + if (dentry->ads_entries[i].stream_name_len == 0) + return dentry->ads_entries[i].lte; + return dentry->lte; +} + +static inline size_t dentry_link_group_size(const struct dentry *dentry) +{ + const struct list_head *cur = &dentry->link_group_list; + size_t size = 0; + do { + size++; + cur = cur->next; + } while (cur != &dentry->link_group_list); + return size; +} + +extern struct ads_entry *dentry_get_ads_entry(struct dentry *dentry, + const char *stream_name); + +extern struct ads_entry *dentry_add_ads(struct dentry *dentry, + const char *stream_name); + +extern void dentry_remove_ads(struct dentry *dentry, struct ads_entry *entry); + +extern const char *path_stream_name(const char *path); + extern u64 dentry_total_length(const struct dentry *dentry); extern void stbuf_to_dentry(const struct stat *stbuf, struct dentry *dentry); -extern void dentry_to_stbuf(const struct dentry *dentry, struct stat *stbuf, - const struct lookup_table *table); - extern int for_dentry_in_tree(struct dentry *root, int (*visitor)(struct dentry*, void*), void *args); @@ -203,7 +301,11 @@ extern int for_dentry_in_tree_depth(struct dentry *root, extern int calculate_dentry_full_path(struct dentry *dentry, void *ignore); extern void calculate_subdir_offsets(struct dentry *dentry, u64 *subdir_offset_p); +extern int get_names(char **name_utf16_ret, char **name_utf8_ret, + u16 *name_utf16_len_ret, u16 *name_utf8_len_ret, + const char *name); extern int change_dentry_name(struct dentry *dentry, const char *new_name); +extern int change_ads_name(struct ads_entry *entry, const char *new_name); extern void unlink_dentry(struct dentry *dentry); extern void link_dentry(struct dentry *dentry, struct dentry *parent); @@ -219,7 +321,12 @@ extern void dentry_update_all_timestamps(struct dentry *dentry); extern void init_dentry(struct dentry *dentry, const char *name); extern struct dentry *new_dentry(const char *name); +extern void dentry_free_ads_entries(struct dentry *dentry); extern void free_dentry(struct dentry *dentry); +extern void put_dentry(struct dentry *dentry); +extern int share_dentry_ads(struct dentry *master, + struct dentry *slave); +extern struct dentry *clone_dentry(struct dentry *old); extern void free_dentry_tree(struct dentry *root, struct lookup_table *lookup_table, bool lt_decrement_refcnt); @@ -241,19 +348,9 @@ extern int read_dentry_tree(const u8 metadata_resource[], extern u8 *write_dentry_tree(const struct dentry *tree, u8 *p); + /* Inline utility functions for WIMDentries */ -/* - * Returns true if @dentry has the UTF-8 file name @name that has length - * @name_len. - */ -static inline bool dentry_has_name(const struct dentry *dentry, const char *name, - size_t name_len) -{ - if (dentry->file_name_utf8_len != name_len) - return false; - return memcmp(dentry->file_name_utf8, name, name_len) == 0; -} static inline bool dentry_is_root(const struct dentry *dentry) { @@ -272,18 +369,22 @@ static inline bool dentry_is_only_child(const struct dentry *dentry) static inline bool dentry_is_directory(const struct dentry *dentry) { - return (dentry->attributes & FILE_ATTRIBUTE_DIRECTORY) != 0; + return (dentry->attributes & FILE_ATTRIBUTE_DIRECTORY) + && !(dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT); } +/* For our purposes, we consider "real" symlinks and "junction points" to both + * be symlinks. */ static inline bool dentry_is_symlink(const struct dentry *dentry) { return (dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT) - && (dentry->reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK); + && ((dentry->reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK) || + dentry->reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT); } static inline bool dentry_is_regular_file(const struct dentry *dentry) { - return !dentry_is_directory(dentry); + return !dentry_is_directory(dentry) && !dentry_is_symlink(dentry); } static inline bool dentry_is_empty_directory(const struct dentry *dentry)