X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Fdentry.h;h=e030acf03b27c3b9487b1d6217cf87ec6bf5ca04;hb=8ed5883780f52ea40dd47347a717dc4ccb7396c5;hp=2f51ecd8823d65b893e2075487a0e0da1a455e87;hpb=91525408b4c14f6defd5c4d304515f564e0b3b01;p=wimlib diff --git a/src/dentry.h b/src/dentry.h index 2f51ecd8..e030acf0 100644 --- a/src/dentry.h +++ b/src/dentry.h @@ -3,32 +3,35 @@ #include "util.h" #include "config.h" +#include "list.h" +#include "sha1.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 WITH_NTFS_3G /* * 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 IO_REPARSE_TAG_RESERVED_ZERO 0x00000000 -#define IO_REPARSE_TAG_RESERVED_ONE 0x00000001 -#define IO_REPARSE_TAG_MOUNT_POINT 0xA0000003 -#define IO_REPARSE_TAG_HSM 0xC0000004 -#define IO_REPARSE_TAG_HSM2 0x80000006 -#define IO_REPARSE_TAG_DRIVER_EXTENDER 0x80000005 -#define IO_REPARSE_TAG_SIS 0x80000007 -#define IO_REPARSE_TAG_DFS 0x8000000A -#define IO_REPARSE_TAG_DFSR 0x80000012 -#define IO_REPARSE_TAG_FILTER_MANAGER 0x8000000B -#define IO_REPARSE_TAG_SYMLINK 0xA000000C -#endif /* !WITH_NTFS_3G */ +#define WIM_IO_REPARSE_TAG_RESERVED_ZERO 0x00000000 +#define WIM_IO_REPARSE_TAG_RESERVED_ONE 0x00000001 +#define WIM_IO_REPARSE_TAG_MOUNT_POINT 0xA0000003 +#define WIM_IO_REPARSE_TAG_HSM 0xC0000004 +#define WIM_IO_REPARSE_TAG_HSM2 0x80000006 +#define WIM_IO_REPARSE_TAG_DRIVER_EXTENDER 0x80000005 +#define WIM_IO_REPARSE_TAG_SIS 0x80000007 +#define WIM_IO_REPARSE_TAG_DFS 0x8000000A +#define WIM_IO_REPARSE_TAG_DFSR 0x80000012 +#define WIM_IO_REPARSE_TAG_FILTER_MANAGER 0x8000000B +#define WIM_IO_REPARSE_TAG_SYMLINK 0xA000000C #define FILE_ATTRIBUTE_READONLY 0x00000001 #define FILE_ATTRIBUTE_HIDDEN 0x00000002 @@ -46,30 +49,58 @@ #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[SHA1_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; + + /* Doubly linked list of streams that share the same lookup table entry */ + struct stream_list_head lte_group_list; }; static inline u64 ads_entry_length(const struct ads_entry *entry) { - return WIM_ADS_ENTRY_DISK_SIZE + entry->stream_name_len; + u64 len = WIM_ADS_ENTRY_DISK_SIZE + entry->stream_name_len + 2; + 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 + +/* In-memory structure for a WIM directory entry. There is a directory tree for * each image in the WIM. */ struct dentry { /* The parent of this directory entry. */ @@ -91,7 +122,6 @@ struct dentry { * included only the length field, but that takes up 8 bytes. */ u64 length; - /* The file attributes associated with this file. */ u32 attributes; @@ -104,19 +134,27 @@ 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 + /* Timestamps for the dentry. The timestamps are the number of * 100-nanosecond intervals that have elapsed since 12:00 A.M., January * 1st, 1601, UTC. */ u64 creation_time; 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[SHA1_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 @@ -130,14 +168,6 @@ 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; @@ -169,18 +199,73 @@ 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 */ + u32 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 */ + ADS_ENTRIES_DEFAULT = 0, + + /* This dentry is the owner of the ads_entries in the hard link + * set */ + ADS_ENTRIES_OWNER, + + /* This dentry shares its ads_entries with a dentry in the hard + * link set that has ADS_ENTRIES_OWNER set. */ + ADS_ENTRIES_USER + } ads_entries_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 the number of dentries in the hard link group */ +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; + wimlib_assert(cur != NULL); + 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); @@ -191,7 +276,11 @@ 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); @@ -207,10 +296,12 @@ 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 struct dentry *clone_dentry(struct dentry *old); extern void free_dentry_tree(struct dentry *root, - struct lookup_table *lookup_table, - bool lt_decrement_refcnt); + struct lookup_table *lookup_table); extern int increment_dentry_refcnt(struct dentry *dentry, void *ignore); extern int decrement_dentry_refcnt(struct dentry *dentry, void *ignore); @@ -229,19 +320,8 @@ 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; -} +/* Inline utility functions for dentries */ static inline bool dentry_is_root(const struct dentry *dentry) { @@ -260,12 +340,22 @@ 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_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)