X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fdentry.c;h=aec94c3435c901778f73894459f208eef33e7db0;hp=0c607e0b2360aa515d74d80f5d8ee0f75f58b9ff;hb=aa882e9bb92d998707484d7f6f56e9cf109a7c62;hpb=81a608ecc78f13a32a69c6185fdacdcf30177ddd diff --git a/src/dentry.c b/src/dentry.c index 0c607e0b..aec94c34 100644 --- a/src/dentry.c +++ b/src/dentry.c @@ -10,34 +10,59 @@ */ /* - * - * Copyright (C) 2010 Carl Thijssen * Copyright (C) 2012 Eric Biggers * * This file is part of wimlib, a library for working with WIM files. * * wimlib is free software; you can redistribute it and/or modify it under the - * terms of the GNU Lesser General Public License as published by the Free - * Software Foundation; either version 2.1 of the License, or (at your option) - * any later version. + * terms of the GNU General Public License as published by the Free Software + * Foundation; either version 3 of the License, or (at your option) any later + * version. * * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR - * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more - * details. + * A PARTICULAR PURPOSE. See the GNU General Public License for more details. * - * You should have received a copy of the GNU Lesser General Public License - * along with wimlib; if not, see http://www.gnu.org/licenses/. + * You should have received a copy of the GNU General Public License along with + * wimlib; if not, see http://www.gnu.org/licenses/. */ -#include "wimlib_internal.h" +#include +#include +#include +#include + #include "dentry.h" #include "io.h" -#include "timestamp.h" #include "lookup_table.h" #include "sha1.h" -#include -#include +#include "timestamp.h" +#include "wimlib_internal.h" + + +static u64 __dentry_correct_length_unaligned(u16 file_name_len, + u16 short_name_len) +{ + u64 length = WIM_DENTRY_DISK_SIZE; + if (file_name_len) + length += file_name_len + 2; + if (short_name_len) + length += short_name_len + 2; + return length; +} + +static u64 dentry_correct_length_unaligned(const struct dentry *dentry) +{ + return __dentry_correct_length_unaligned(dentry->file_name_len, + dentry->short_name_len); +} + +/* Return the "correct" value to write in the length field of the dentry, based + * on the file name length and short name length */ +static u64 dentry_correct_length(const struct dentry *dentry) +{ + return (dentry_correct_length_unaligned(dentry) + 7) & ~7; +} /* * Returns true if @dentry has the UTF-8 file name @name that has length @@ -51,130 +76,173 @@ static bool dentry_has_name(const struct dentry *dentry, const char *name, return memcmp(dentry->file_name_utf8, name, name_len) == 0; } +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; +} + +/* Duplicates a UTF-8 name into UTF-8 and UTF-16 strings and returns the strings + * and their lengths in the pointer arguments */ +int get_names(char **name_utf16_ret, char **name_utf8_ret, + u16 *name_utf16_len_ret, u16 *name_utf8_len_ret, + const char *name) +{ + size_t utf8_len; + size_t utf16_len; + char *name_utf16, *name_utf8; + + utf8_len = strlen(name); + + name_utf16 = utf8_to_utf16(name, utf8_len, &utf16_len); + + if (!name_utf16) + return WIMLIB_ERR_NOMEM; + + name_utf8 = MALLOC(utf8_len + 1); + if (!name_utf8) { + FREE(name_utf8); + return WIMLIB_ERR_NOMEM; + } + memcpy(name_utf8, name, utf8_len + 1); + FREE(*name_utf8_ret); + FREE(*name_utf16_ret); + *name_utf8_ret = name_utf8; + *name_utf16_ret = name_utf16; + *name_utf8_len_ret = utf8_len; + *name_utf16_len_ret = utf16_len; + return 0; +} + +/* Changes the name of a dentry to @new_name. Only changes the file_name and + * file_name_utf8 fields; does not change the short_name, short_name_utf8, or + * full_path_utf8 fields. Also recalculates its length. */ +static int change_dentry_name(struct dentry *dentry, const char *new_name) +{ + int ret; + + ret = get_names(&dentry->file_name, &dentry->file_name_utf8, + &dentry->file_name_len, &dentry->file_name_utf8_len, + new_name); + FREE(dentry->short_name); + dentry->short_name_len = 0; + if (ret == 0) + dentry->length = dentry_correct_length(dentry); + return ret; +} + +/* + * Changes the name of an alternate data stream */ +static int change_ads_name(struct ads_entry *entry, const char *new_name) +{ + return get_names(&entry->stream_name, &entry->stream_name_utf8, + &entry->stream_name_len, + &entry->stream_name_utf8_len, + new_name); +} + +/* Returns the total length of a WIM alternate data stream entry on-disk, + * including the stream name, the null terminator, AND the padding after the + * entry to align the next one (or the next dentry) on an 8-byte boundary. */ +static u64 ads_entry_total_length(const struct ads_entry *entry) +{ + u64 len = WIM_ADS_ENTRY_DISK_SIZE; + if (entry->stream_name_len) + len += entry->stream_name_len + 2; + return (len + 7) & ~7; +} + + +static u64 __dentry_total_length(const struct dentry *dentry, u64 length) +{ + const struct inode *inode = dentry->d_inode; + for (u16 i = 0; i < inode->num_ads; i++) + length += ads_entry_total_length(&inode->ads_entries[i]); + return (length + 7) & ~7; +} + +u64 dentry_correct_total_length(const struct dentry *dentry) +{ + return __dentry_total_length(dentry, + dentry_correct_length_unaligned(dentry)); +} + /* Real length of a dentry, including the alternate data stream entries, which * are not included in the dentry->length field... */ -u64 dentry_total_length(const struct dentry *dentry) +static u64 dentry_total_length(const struct dentry *dentry) { - u64 length = (dentry->length + 7) & ~7; - for (u16 i = 0 ; i < dentry->num_ads; i++) - length += ads_entry_length(&dentry->ads_entries[i]); - return length; + return __dentry_total_length(dentry, dentry->length); } -/* Transfers file attributes from a `stat' buffer to a struct dentry. */ -void stbuf_to_dentry(const struct stat *stbuf, struct dentry *dentry) +/* Transfers file attributes from a `stat' buffer to an inode. */ +void stbuf_to_inode(const struct stat *stbuf, struct inode *inode) { if (S_ISLNK(stbuf->st_mode)) { - dentry->attributes = FILE_ATTRIBUTE_REPARSE_POINT; - dentry->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK; + inode->attributes = FILE_ATTRIBUTE_REPARSE_POINT; + inode->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK; } else if (S_ISDIR(stbuf->st_mode)) { - dentry->attributes = FILE_ATTRIBUTE_DIRECTORY; + inode->attributes = FILE_ATTRIBUTE_DIRECTORY; } else { - dentry->attributes = FILE_ATTRIBUTE_NORMAL; + inode->attributes = FILE_ATTRIBUTE_NORMAL; } if (sizeof(ino_t) >= 8) - dentry->hard_link = (u64)stbuf->st_ino; + inode->ino = (u64)stbuf->st_ino; else - dentry->hard_link = (u64)stbuf->st_ino | + inode->ino = (u64)stbuf->st_ino | ((u64)stbuf->st_dev << (sizeof(ino_t) * 8)); + /* Set timestamps */ + inode->creation_time = timespec_to_wim_timestamp(&stbuf->st_mtim); + inode->last_write_time = timespec_to_wim_timestamp(&stbuf->st_mtim); + inode->last_access_time = timespec_to_wim_timestamp(&stbuf->st_atim); } -/* Transfers file attributes from a struct dentry to a `stat' buffer. */ -void dentry_to_stbuf(const struct dentry *dentry, struct stat *stbuf, - const struct lookup_table *table) +#ifdef WITH_FUSE +/* Transfers file attributes from a struct inode to a `stat' buffer. + * + * The lookup table entry tells us which stream in the inode we are statting. + * For a named data stream, everything returned is the same as the unnamed data + * stream except possibly the size and block count. */ +int inode_to_stbuf(const struct inode *inode, struct lookup_table_entry *lte, + struct stat *stbuf) { - struct lookup_table_entry *lte; - - - - if (dentry_is_symlink(dentry)) + if (inode_is_symlink(inode)) stbuf->st_mode = S_IFLNK | 0777; - else if (dentry_is_directory(dentry)) + else if (inode_is_directory(inode)) stbuf->st_mode = S_IFDIR | 0755; else stbuf->st_mode = S_IFREG | 0644; - stbuf->st_ino = dentry->hard_link; - stbuf->st_nlink = dentry_link_group_size(dentry); + stbuf->st_ino = (ino_t)inode->ino; + stbuf->st_nlink = inode->link_count; stbuf->st_uid = getuid(); stbuf->st_gid = getgid(); - /* Use the size of the unnamed (default) file stream. */ - if (table && (lte = __lookup_resource(table, dentry_hash(dentry)))) { - if (lte->staging_file_name) { + if (lte) { + if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { + wimlib_assert(lte->staging_file_name); struct stat native_stat; - stat(lte->staging_file_name, &native_stat); + if (stat(lte->staging_file_name, &native_stat) != 0) { + DEBUG("Failed to stat `%s': %m", + lte->staging_file_name); + return -errno; + } stbuf->st_size = native_stat.st_size; } else { - stbuf->st_size = lte->resource_entry.original_size; + stbuf->st_size = wim_resource_size(lte); } } else { stbuf->st_size = 0; } - stbuf->st_atime = ms_timestamp_to_unix(dentry->last_access_time); - stbuf->st_mtime = ms_timestamp_to_unix(dentry->last_write_time); - stbuf->st_ctime = ms_timestamp_to_unix(dentry->creation_time); + stbuf->st_atime = wim_timestamp_to_unix(inode->last_access_time); + stbuf->st_mtime = wim_timestamp_to_unix(inode->last_write_time); + stbuf->st_ctime = wim_timestamp_to_unix(inode->creation_time); stbuf->st_blocks = (stbuf->st_size + 511) / 512; + return 0; } - -/* Makes all timestamp fields for the dentry be the current time. */ -void dentry_update_all_timestamps(struct dentry *dentry) -{ - u64 now = get_timestamp(); - dentry->creation_time = now; - dentry->last_access_time = now; - dentry->last_write_time = now; -} - -struct ads_entry *dentry_get_ads_entry(struct dentry *dentry, - const char *stream_name) -{ - size_t stream_name_len = strlen(stream_name); - if (!stream_name) - return NULL; - for (u16 i = 0; i < dentry->num_ads; i++) - if (ads_entry_has_name(&dentry->ads_entries[i], - stream_name, stream_name_len)) - return &dentry->ads_entries[i]; - return NULL; -} - -/* Add an alternate stream entry to a dentry and return a pointer to it, or NULL - * on failure. */ -struct ads_entry *dentry_add_ads(struct dentry *dentry, const char *stream_name) -{ - u16 num_ads = dentry->num_ads + 1; - struct ads_entry *ads_entries; - struct ads_entry *new_entry; - if (num_ads == 0xffff) - return NULL; - ads_entries = MALLOC(num_ads * sizeof(struct ads_entry)); - if (!ads_entries) - return NULL; - - new_entry = &ads_entries[num_ads - 1]; - if (change_ads_name(new_entry, stream_name) != 0) { - FREE(ads_entries); - return NULL; - } - - memcpy(ads_entries, dentry->ads_entries, - (num_ads - 1) * sizeof(struct ads_entry)); - FREE(dentry->ads_entries); - dentry->ads_entries = ads_entries; - dentry->num_ads = num_ads; - return memset(new_entry, 0, sizeof(struct ads_entry)); -} - -void dentry_remove_ads(struct dentry *dentry, struct ads_entry *sentry) -{ - destroy_ads_entry(sentry); - memcpy(sentry, sentry + 1, - (dentry->num_ads - (sentry - dentry->ads_entries + 1)) - * sizeof(struct ads_entry)); - dentry->num_ads--; -} +#endif /* * Calls a function on all directory entries in a directory tree. It is called @@ -191,7 +259,7 @@ int for_dentry_in_tree(struct dentry *root, if (ret != 0) return ret; - child = root->children; + child = root->d_inode->children; if (!child) return 0; @@ -201,7 +269,7 @@ int for_dentry_in_tree(struct dentry *root, if (ret != 0) return ret; child = child->next; - } while (child != root->children); + } while (child != root->d_inode->children); return 0; } @@ -216,7 +284,7 @@ int for_dentry_in_tree_depth(struct dentry *root, struct dentry *child; struct dentry *next; - child = root->children; + child = root->d_inode->children; if (child) { do { next = child->next; @@ -224,7 +292,7 @@ int for_dentry_in_tree_depth(struct dentry *root, if (ret != 0) return ret; child = next; - } while (child != root->children); + } while (child != root->d_inode->children); } return visitor(root, arg); } @@ -290,16 +358,16 @@ void calculate_subdir_offsets(struct dentry *dentry, u64 *subdir_offset_p) { struct dentry *child; - child = dentry->children; + child = dentry->d_inode->children; dentry->subdir_offset = *subdir_offset_p; - if (child) { + if (child) { /* Advance the subdir offset by the amount of space the children * of this dentry take up. */ do { - *subdir_offset_p += dentry_total_length(child); + *subdir_offset_p += dentry_correct_total_length(child); child = child->next; - } while (child != dentry->children); + } while (child != dentry->d_inode->children); /* End-of-directory dentry on disk. */ *subdir_offset_p += 8; @@ -309,11 +377,11 @@ void calculate_subdir_offsets(struct dentry *dentry, u64 *subdir_offset_p) do { calculate_subdir_offsets(child, subdir_offset_p); child = child->next; - } while (child != dentry->children); + } while (child != dentry->d_inode->children); } else { /* On disk, childless directories have a valid subdir_offset * that points to an 8-byte end-of-directory dentry. Regular - * files have a subdir_offset of 0. */ + * files or reparse points have a subdir_offset of 0. */ if (dentry_is_directory(dentry)) *subdir_offset_p += 8; else @@ -321,30 +389,30 @@ void calculate_subdir_offsets(struct dentry *dentry, u64 *subdir_offset_p) } } - /* Returns the child of @dentry that has the file name @name. * Returns NULL if no child has the name. */ struct dentry *get_dentry_child_with_name(const struct dentry *dentry, - const char *name) + const char *name) { struct dentry *child; size_t name_len; - child = dentry->children; + child = dentry->d_inode->children; if (child) { name_len = strlen(name); do { if (dentry_has_name(child, name, name_len)) return child; child = child->next; - } while (child != dentry->children); + } while (child != dentry->d_inode->children); } return NULL; } /* Retrieves the dentry that has the UTF-8 @path relative to the dentry * @cur_dir. Returns NULL if no dentry having the path is found. */ -static struct dentry *get_dentry_relative_path(struct dentry *cur_dir, const char *path) +static struct dentry *get_dentry_relative_path(struct dentry *cur_dir, + const char *path) { struct dentry *child; size_t base_len; @@ -353,14 +421,14 @@ static struct dentry *get_dentry_relative_path(struct dentry *cur_dir, const cha if (*path == '\0') return cur_dir; - child = cur_dir->children; + child = cur_dir->d_inode->children; if (child) { new_path = path_next_part(path, &base_len); do { if (dentry_has_name(child, path, base_len)) return get_dentry_relative_path(child, new_path); child = child->next; - } while (child != cur_dir->children); + } while (child != cur_dir->d_inode->children); } return NULL; } @@ -375,7 +443,18 @@ struct dentry *get_dentry(WIMStruct *w, const char *path) return get_dentry_relative_path(root, path); } -/* Returns the parent directory for the @path. */ +struct inode *wim_pathname_to_inode(WIMStruct *w, const char *path) +{ + struct dentry *dentry; + dentry = get_dentry(w, path); + if (!dentry) + return NULL; + else + return dentry->d_inode; +} + +/* Returns the dentry that corresponds to the parent directory of @path, or NULL + * if the dentry is not found. */ struct dentry *get_parent_dentry(WIMStruct *w, const char *path) { size_t path_len = strlen(path); @@ -396,55 +475,71 @@ int print_dentry_full_path(struct dentry *dentry, void *ignore) return 0; } +/* We want to be able to show the names of the file attribute flags that are + * set. */ struct file_attr_flag { u32 flag; const char *name; }; struct file_attr_flag file_attr_flags[] = { - {FILE_ATTRIBUTE_READONLY, "READONLY"}, - {FILE_ATTRIBUTE_HIDDEN, "HIDDEN"}, - {FILE_ATTRIBUTE_SYSTEM, "SYSTEM"}, - {FILE_ATTRIBUTE_DIRECTORY, "DIRECTORY"}, - {FILE_ATTRIBUTE_ARCHIVE, "ARCHIVE"}, - {FILE_ATTRIBUTE_DEVICE, "DEVICE"}, - {FILE_ATTRIBUTE_NORMAL, "NORMAL"}, - {FILE_ATTRIBUTE_TEMPORARY, "TEMPORARY"}, - {FILE_ATTRIBUTE_SPARSE_FILE, "SPARSE_FILE"}, - {FILE_ATTRIBUTE_REPARSE_POINT, "REPARSE_POINT"}, - {FILE_ATTRIBUTE_COMPRESSED, "COMPRESSED"}, - {FILE_ATTRIBUTE_OFFLINE, "OFFLINE"}, + {FILE_ATTRIBUTE_READONLY, "READONLY"}, + {FILE_ATTRIBUTE_HIDDEN, "HIDDEN"}, + {FILE_ATTRIBUTE_SYSTEM, "SYSTEM"}, + {FILE_ATTRIBUTE_DIRECTORY, "DIRECTORY"}, + {FILE_ATTRIBUTE_ARCHIVE, "ARCHIVE"}, + {FILE_ATTRIBUTE_DEVICE, "DEVICE"}, + {FILE_ATTRIBUTE_NORMAL, "NORMAL"}, + {FILE_ATTRIBUTE_TEMPORARY, "TEMPORARY"}, + {FILE_ATTRIBUTE_SPARSE_FILE, "SPARSE_FILE"}, + {FILE_ATTRIBUTE_REPARSE_POINT, "REPARSE_POINT"}, + {FILE_ATTRIBUTE_COMPRESSED, "COMPRESSED"}, + {FILE_ATTRIBUTE_OFFLINE, "OFFLINE"}, {FILE_ATTRIBUTE_NOT_CONTENT_INDEXED,"NOT_CONTENT_INDEXED"}, - {FILE_ATTRIBUTE_ENCRYPTED, "ENCRYPTED"}, - {FILE_ATTRIBUTE_VIRTUAL, "VIRTUAL"}, + {FILE_ATTRIBUTE_ENCRYPTED, "ENCRYPTED"}, + {FILE_ATTRIBUTE_VIRTUAL, "VIRTUAL"}, }; -/* Prints a directory entry. @lookup_table is a pointer to the lookup table, or - * NULL if the resource entry for the dentry is not to be printed. */ +/* Prints a directory entry. @lookup_table is a pointer to the lookup table, if + * available. If the dentry is unresolved and the lookup table is NULL, the + * lookup table entries will not be printed. Otherwise, they will be. */ int print_dentry(struct dentry *dentry, void *lookup_table) { + const u8 *hash; struct lookup_table_entry *lte; - unsigned i; + const struct inode *inode = dentry->d_inode; + time_t time; + char *p; printf("[DENTRY]\n"); printf("Length = %"PRIu64"\n", dentry->length); - printf("Attributes = 0x%x\n", dentry->attributes); - for (i = 0; i < ARRAY_LEN(file_attr_flags); i++) - if (file_attr_flags[i].flag & dentry->attributes) + printf("Attributes = 0x%x\n", inode->attributes); + for (unsigned i = 0; i < ARRAY_LEN(file_attr_flags); i++) + if (file_attr_flags[i].flag & inode->attributes) printf(" FILE_ATTRIBUTE_%s is set\n", file_attr_flags[i].name); - printf("Security ID = %d\n", dentry->security_id); + printf("Security ID = %d\n", inode->security_id); printf("Subdir offset = %"PRIu64"\n", dentry->subdir_offset); - /*printf("Unused1 = 0x%"PRIu64"\n", dentry->unused1);*/ - /*printf("Unused2 = %"PRIu64"\n", dentry->unused2);*/ - printf("Creation Time = 0x%"PRIx64"\n", dentry->creation_time); - printf("Last Access Time = 0x%"PRIx64"\n", dentry->last_access_time); - printf("Last Write Time = 0x%"PRIx64"\n", dentry->last_write_time); - printf("Hash = 0x"); - print_hash(dentry->hash); - putchar('\n'); - printf("Reparse Tag = 0x%"PRIx32"\n", dentry->reparse_tag); - printf("Hard Link Group = 0x%"PRIx64"\n", dentry->hard_link); - printf("Number of Alternate Data Streams = %hu\n", dentry->num_ads); + + /* Translate the timestamps into something readable */ + time = wim_timestamp_to_unix(inode->creation_time); + p = asctime(gmtime(&time)); + *(strrchr(p, '\n')) = '\0'; + printf("Creation Time = %s UTC\n", p); + + time = wim_timestamp_to_unix(inode->last_access_time); + p = asctime(gmtime(&time)); + *(strrchr(p, '\n')) = '\0'; + printf("Last Access Time = %s UTC\n", p); + + time = wim_timestamp_to_unix(inode->last_write_time); + p = asctime(gmtime(&time)); + *(strrchr(p, '\n')) = '\0'; + printf("Last Write Time = %s UTC\n", p); + + printf("Reparse Tag = 0x%"PRIx32"\n", inode->reparse_tag); + printf("Hard Link Group = 0x%"PRIx64"\n", inode->ino); + printf("Hard Link Group Size = %"PRIu32"\n", inode->link_count); + printf("Number of Alternate Data Streams = %hu\n", inode->num_ads); printf("Filename = \""); print_string(dentry->file_name, dentry->file_name_len); puts("\""); @@ -456,42 +551,74 @@ int print_dentry(struct dentry *dentry, void *lookup_table) puts("\""); printf("Short Name Length = %hu\n", dentry->short_name_len); printf("Full Path (UTF-8) = \"%s\"\n", dentry->full_path_utf8); - if (lookup_table && (lte = __lookup_resource(lookup_table, dentry->hash))) - print_lookup_table_entry(lte, NULL); - else - putchar('\n'); - for (u16 i = 0; i < dentry->num_ads; i++) { + lte = inode_stream_lte(dentry->d_inode, 0, lookup_table); + if (lte) { + print_lookup_table_entry(lte); + } else { + hash = inode_stream_hash(inode, 0); + if (hash) { + printf("Hash = 0x"); + print_hash(hash); + putchar('\n'); + putchar('\n'); + } + } + for (u16 i = 0; i < inode->num_ads; i++) { printf("[Alternate Stream Entry %u]\n", i); - printf("Name = \"%s\"\n", dentry->ads_entries[i].stream_name_utf8); + printf("Name = \"%s\"\n", inode->ads_entries[i].stream_name_utf8); printf("Name Length (UTF-16) = %u\n", - dentry->ads_entries[i].stream_name_len); - printf("Hash = 0x"); - print_hash(dentry->ads_entries[i].hash); - if (lookup_table && - (lte = __lookup_resource(lookup_table, - dentry->ads_entries[i].hash))) - { - print_lookup_table_entry(lte, NULL); - } else { + inode->ads_entries[i].stream_name_len); + hash = inode_stream_hash(inode, i + 1); + if (hash) { + printf("Hash = 0x"); + print_hash(hash); putchar('\n'); } + print_lookup_table_entry(inode_stream_lte(inode, i + 1, + lookup_table)); } return 0; } -static inline void dentry_common_init(struct dentry *dentry) +/* Initializations done on every `struct dentry'. */ +static void dentry_common_init(struct dentry *dentry) { memset(dentry, 0, sizeof(struct dentry)); dentry->refcnt = 1; - dentry->security_id = -1; - dentry->link_group_master_status = GROUP_SLAVE; +} + +static struct inode *new_timeless_inode() +{ + struct inode *inode = CALLOC(1, sizeof(struct inode)); + if (!inode) + return NULL; + inode->security_id = -1; + inode->link_count = 1; +#ifdef WITH_FUSE + inode->next_stream_id = 1; +#endif + INIT_LIST_HEAD(&inode->dentry_list); + return inode; +} + +static struct inode *new_inode() +{ + struct inode *inode = new_timeless_inode(); + if (!inode) + return NULL; + u64 now = get_wim_timestamp(); + inode->creation_time = now; + inode->last_access_time = now; + inode->last_write_time = now; + return inode; } /* * Creates an unlinked directory entry. * - * @name: The base name of the new dentry. - * @return: A pointer to the new dentry, or NULL if out of memory. + * @name: The UTF-8 filename of the new dentry. + * + * Returns a pointer to the new dentry, or NULL if out of memory. */ struct dentry *new_dentry(const char *name) { @@ -505,11 +632,10 @@ struct dentry *new_dentry(const char *name) if (change_dentry_name(dentry, name) != 0) goto err; - dentry_update_all_timestamps(dentry); dentry->next = dentry; dentry->prev = dentry; dentry->parent = dentry; - INIT_LIST_HEAD(&dentry->link_group_list); + return dentry; err: FREE(dentry); @@ -517,148 +643,134 @@ err: return NULL; } -void dentry_free_ads_entries(struct dentry *dentry) + +static struct dentry *__new_dentry_with_inode(const char *name, bool timeless) { - for (u16 i = 0; i < dentry->num_ads; i++) - destroy_ads_entry(&dentry->ads_entries[i]); - FREE(dentry->ads_entries); - dentry->ads_entries = NULL; - dentry->num_ads = 0; + struct dentry *dentry; + dentry = new_dentry(name); + if (dentry) { + if (timeless) + dentry->d_inode = new_timeless_inode(); + else + dentry->d_inode = new_inode(); + if (dentry->d_inode) { + inode_add_dentry(dentry, dentry->d_inode); + } else { + free_dentry(dentry); + dentry = NULL; + } + } + return dentry; } -static void __destroy_dentry(struct dentry *dentry) +struct dentry *new_dentry_with_timeless_inode(const char *name) { - FREE(dentry->file_name); - FREE(dentry->file_name_utf8); - FREE(dentry->short_name); - FREE(dentry->full_path_utf8); + return __new_dentry_with_inode(name, true); } -void free_dentry(struct dentry *dentry) +struct dentry *new_dentry_with_inode(const char *name) { - __destroy_dentry(dentry); - if (dentry->link_group_master_status != GROUP_SLAVE) - dentry_free_ads_entries(dentry); - FREE(dentry); + return __new_dentry_with_inode(name, false); } -void put_dentry(struct dentry *dentry) + +static int init_ads_entry(struct ads_entry *ads_entry, const char *name) { - if (dentry->link_group_master_status == GROUP_MASTER) { - struct dentry *new_master; - list_for_each_entry(new_master, &dentry->link_group_list, - link_group_list) - { - if (new_master->link_group_master_status == GROUP_SLAVE) { - new_master->link_group_master_status = GROUP_MASTER; - dentry->link_group_master_status = GROUP_SLAVE; - break; - } - } - } - list_del(&dentry->link_group_list); - free_dentry(dentry); + int ret = 0; + memset(ads_entry, 0, sizeof(*ads_entry)); + if (name && *name) + ret = change_ads_name(ads_entry, name); + return ret; } -static bool dentries_have_same_ads(const struct dentry *d1, - const struct dentry *d2) +static void destroy_ads_entry(struct ads_entry *ads_entry) { - /* Verify stream names and hashes are the same */ - for (u16 i = 0; i < d1->num_ads; i++) { - if (strcmp(d1->ads_entries[i].stream_name_utf8, - d2->ads_entries[i].stream_name_utf8) != 0) - return false; - if (memcmp(d1->ads_entries[i].hash, - d2->ads_entries[i].hash, - WIM_HASH_SIZE) != 0) - return false; - } - return true; + FREE(ads_entry->stream_name); + FREE(ads_entry->stream_name_utf8); } -/* Share the alternate stream entries between hard-linked dentries. */ -int share_dentry_ads(struct dentry *master, struct dentry *slave) + +/* Frees an inode. */ +void free_inode(struct inode *inode) { - const char *mismatch_type; - wimlib_assert(master->num_ads == 0 || - master->ads_entries != slave->ads_entries); - if (master->attributes != slave->attributes) { - mismatch_type = "attributes"; - goto mismatch; - } - if (master->attributes & FILE_ATTRIBUTE_DIRECTORY) { - ERROR("`%s' is hard-linked to `%s', which is a directory ", - slave->full_path_utf8, master->full_path_utf8); - return WIMLIB_ERR_INVALID_DENTRY; - } - if (master->security_id != slave->security_id) { - mismatch_type = "security ID"; - goto mismatch; - } - if (memcmp(master->hash, slave->hash, WIM_HASH_SIZE) != 0) { - mismatch_type = "main file resource"; - goto mismatch; + if (inode) { + if (inode->ads_entries) { + for (u16 i = 0; i < inode->num_ads; i++) + destroy_ads_entry(&inode->ads_entries[i]); + FREE(inode->ads_entries); + } + #ifdef WITH_FUSE + wimlib_assert(inode->num_opened_fds == 0); + FREE(inode->fds); + #endif + FREE(inode); } - if (!dentries_have_same_ads(master, slave)) { - mismatch_type = "Alternate Stream Entries"; - goto mismatch; +} + +/* Decrements link count on an inode and frees it if the link count reaches 0. + * */ +static void put_inode(struct inode *inode) +{ + wimlib_assert(inode); + wimlib_assert(inode->link_count); + if (--inode->link_count == 0) { + #ifdef WITH_FUSE + if (inode->num_opened_fds == 0) + #endif + { + free_inode(inode); + inode = NULL; + } } - dentry_free_ads_entries(slave); - slave->ads_entries = master->ads_entries; - slave->link_group_master_status = GROUP_SLAVE; - return 0; -mismatch: - ERROR("Dentries `%s' and `%s' in the same hard-link group but " - "do not share the same %s", - master->full_path_utf8, slave->full_path_utf8, - mismatch_type); - return WIMLIB_ERR_INVALID_DENTRY; } -/* clones a dentry. +/* Frees a WIM dentry. * - * Beware: - * - memory for file names is not cloned - * - next, prev, and children pointers and not touched - * - stream entries are not cloned. + * The inode is freed only if its link count is decremented to 0. */ -struct dentry *clone_dentry(struct dentry *old) +void free_dentry(struct dentry *dentry) { - struct dentry *new = MALLOC(sizeof(struct dentry)); - if (!new) - return NULL; - memcpy(new, old, sizeof(struct dentry)); - new->file_name = NULL; - new->file_name_len = 0; - new->file_name_utf8 = NULL; - new->file_name_utf8_len = 0; - new->short_name = NULL; - new->short_name_len = 0; - return new; + wimlib_assert(dentry); + struct inode *inode; + + FREE(dentry->file_name); + FREE(dentry->file_name_utf8); + FREE(dentry->short_name); + FREE(dentry->full_path_utf8); + put_inode(dentry->d_inode); + FREE(dentry); } -/* Arguments for do_free_dentry(). */ -struct free_dentry_args { - struct lookup_table *lookup_table; - bool lt_decrement_refcnt; -}; +void put_dentry(struct dentry *dentry) +{ + wimlib_assert(dentry); + wimlib_assert(dentry->refcnt); + + if (--dentry->refcnt == 0) + free_dentry(dentry); +} /* * This function is passed as an argument to for_dentry_in_tree_depth() in order * to free a directory tree. __args is a pointer to a `struct free_dentry_args'. */ -static int do_free_dentry(struct dentry *dentry, void *__args) +static int do_free_dentry(struct dentry *dentry, void *__lookup_table) { - struct free_dentry_args *args = (struct free_dentry_args*)__args; + struct lookup_table *lookup_table = __lookup_table; + unsigned i; - if (args->lt_decrement_refcnt && !dentry_is_directory(dentry)) { - lookup_table_decrement_refcnt(args->lookup_table, - dentry->hash); + if (lookup_table) { + struct lookup_table_entry *lte; + struct inode *inode = dentry->d_inode; + wimlib_assert(inode->link_count); + for (i = 0; i <= inode->num_ads; i++) { + lte = inode_stream_lte(inode, i, lookup_table); + if (lte) + lte_decrement_refcnt(lte, lookup_table); + } } - wimlib_assert(dentry->refcnt >= 1); - if (--dentry->refcnt == 0) - free_dentry(dentry); + put_dentry(dentry); return 0; } @@ -666,20 +778,16 @@ static int do_free_dentry(struct dentry *dentry, void *__args) * Unlinks and frees a dentry tree. * * @root: The root of the tree. - * @lookup_table: The lookup table for dentries. - * @decrement_refcnt: True if the dentries in the tree are to have their - * reference counts in the lookup table decremented. + * @lookup_table: The lookup table for dentries. If non-NULL, the + * reference counts in the lookup table for the lookup + * table entries corresponding to the dentries will be + * decremented. */ -void free_dentry_tree(struct dentry *root, struct lookup_table *lookup_table, - bool lt_decrement_refcnt) +void free_dentry_tree(struct dentry *root, struct lookup_table *lookup_table) { if (!root || !root->parent) return; - - struct free_dentry_args args; - args.lookup_table = lookup_table; - args.lt_decrement_refcnt = lt_decrement_refcnt; - for_dentry_in_tree_depth(root, do_free_dentry, &args); + for_dentry_in_tree_depth(root, do_free_dentry, lookup_table); } int increment_dentry_refcnt(struct dentry *dentry, void *ignore) @@ -696,185 +804,346 @@ int increment_dentry_refcnt(struct dentry *dentry, void *ignore) */ void link_dentry(struct dentry *dentry, struct dentry *parent) { + wimlib_assert(dentry_is_directory(parent)); dentry->parent = parent; - if (parent->children) { + if (parent->d_inode->children) { /* Not an only child; link to siblings. */ - dentry->next = parent->children; - dentry->prev = parent->children->prev; + dentry->next = parent->d_inode->children; + dentry->prev = parent->d_inode->children->prev; dentry->next->prev = dentry; dentry->prev->next = dentry; } else { /* Only child; link to parent. */ - parent->children = dentry; + parent->d_inode->children = dentry; dentry->next = dentry; dentry->prev = dentry; } } -/* Unlink a dentry from the directory tree. +#ifdef WITH_FUSE +/* + * Unlink a dentry from the directory tree. * - * Note: This merely removes it from the in-memory tree structure. See - * remove_dentry() in mount.c for a function implemented on top of this one that - * frees the dentry and implements reference counting for the lookup table - * entries. */ + * Note: This merely removes it from the in-memory tree structure. + */ void unlink_dentry(struct dentry *dentry) { if (dentry_is_root(dentry)) return; if (dentry_is_only_child(dentry)) { - dentry->parent->children = NULL; + dentry->parent->d_inode->children = NULL; } else { if (dentry_is_first_sibling(dentry)) - dentry->parent->children = dentry->next; + dentry->parent->d_inode->children = dentry->next; dentry->next->prev = dentry->prev; dentry->prev->next = dentry->next; } } +#endif - -/* Recalculates the length of @dentry based on its file name length and short - * name length. */ -static inline void recalculate_dentry_size(struct dentry *dentry) +static inline struct dentry *inode_first_dentry(struct inode *inode) { - dentry->length = WIM_DENTRY_DISK_SIZE + dentry->file_name_len + - 2 + dentry->short_name_len; - /* Must be multiple of 8. */ - dentry->length = (dentry->length + 7) & ~7; + wimlib_assert(inode->dentry_list.next != &inode->dentry_list); + return container_of(inode->dentry_list.next, struct dentry, + inode_dentry_list); } -int get_names(char **name_utf16_ret, char **name_utf8_ret, - u16 *name_utf16_len_ret, u16 *name_utf8_len_ret, - const char *name) +static int verify_inode(struct inode *inode, const WIMStruct *w) { - size_t utf8_len; - size_t utf16_len; - char *name_utf16, *name_utf8; - - utf8_len = strlen(name); - - name_utf16 = utf8_to_utf16(name, utf8_len, &utf16_len); + const struct lookup_table *table = w->lookup_table; + const struct wim_security_data *sd = wim_const_security_data(w); + const struct dentry *first_dentry = inode_first_dentry(inode); + int ret = WIMLIB_ERR_INVALID_DENTRY; + + /* Check the security ID */ + if (inode->security_id < -1) { + ERROR("Dentry `%s' has an invalid security ID (%d)", + first_dentry->full_path_utf8, inode->security_id); + goto out; + } + if (inode->security_id >= sd->num_entries) { + ERROR("Dentry `%s' has an invalid security ID (%d) " + "(there are only %u entries in the security table)", + first_dentry->full_path_utf8, inode->security_id, + sd->num_entries); + goto out; + } - if (!name_utf16) - return WIMLIB_ERR_NOMEM; + /* Check that lookup table entries for all the resources exist, except + * if the SHA1 message digest is all 0's, which indicates there is + * intentionally no resource there. */ + if (w->hdr.total_parts == 1) { + for (unsigned i = 0; i <= inode->num_ads; i++) { + struct lookup_table_entry *lte; + const u8 *hash; + hash = inode_stream_hash_unresolved(inode, i); + lte = __lookup_resource(table, hash); + if (!lte && !is_zero_hash(hash)) { + ERROR("Could not find lookup table entry for stream " + "%u of dentry `%s'", i, first_dentry->full_path_utf8); + goto out; + } + if (lte && (lte->real_refcnt += inode->link_count) > lte->refcnt) + { + #ifdef ENABLE_ERROR_MESSAGES + WARNING("The following lookup table entry " + "has a reference count of %u, but", + lte->refcnt); + WARNING("We found %zu references to it", + lte->real_refcnt); + WARNING("(One dentry referencing it is at `%s')", + first_dentry->full_path_utf8); + + print_lookup_table_entry(lte); + #endif + /* Guess what! install.wim for Windows 8 + * contains a stream with 2 dentries referencing + * it, but the lookup table entry has reference + * count of 1. So we will need to handle this + * case and not just make it be an error... I'm + * just setting the reference count to the + * number of references we found. + * (Unfortunately, even after doing this, the + * reference count could be too low if it's also + * referenced in other WIM images) */ + + #if 1 + lte->refcnt = lte->real_refcnt; + WARNING("Fixing reference count"); + #else + goto out; + #endif + } + } + } - name_utf8 = MALLOC(utf8_len + 1); - if (!name_utf8) { - FREE(name_utf8); - return WIMLIB_ERR_NOMEM; + /* Make sure there is only one un-named stream. */ + unsigned num_unnamed_streams = 0; + for (unsigned i = 0; i <= inode->num_ads; i++) { + const u8 *hash; + hash = inode_stream_hash_unresolved(inode, i); + if (!inode_stream_name_len(inode, i) && !is_zero_hash(hash)) + num_unnamed_streams++; } - memcpy(name_utf8, name, utf8_len + 1); - FREE(*name_utf8_ret); - FREE(*name_utf16_ret); - *name_utf8_ret = name_utf8; - *name_utf16_ret = name_utf16; - *name_utf8_len_ret = utf8_len; - *name_utf16_len_ret = utf16_len; - return 0; + if (num_unnamed_streams > 1) { + ERROR("Dentry `%s' has multiple (%u) un-named streams", + first_dentry->full_path_utf8, num_unnamed_streams); + goto out; + } + inode->verified = true; + ret = 0; +out: + return ret; } -/* Changes the name of a dentry to @new_name. Only changes the file_name and - * file_name_utf8 fields; does not change the short_name, short_name_utf8, or - * full_path_utf8 fields. Also recalculates its length. */ -int change_dentry_name(struct dentry *dentry, const char *new_name) +/* Run some miscellaneous verifications on a WIM dentry */ +int verify_dentry(struct dentry *dentry, void *wim) { - int ret; + const WIMStruct *w = wim; + const struct inode *inode = dentry->d_inode; + int ret = WIMLIB_ERR_INVALID_DENTRY; - ret = get_names(&dentry->file_name, &dentry->file_name_utf8, - &dentry->file_name_len, &dentry->file_name_utf8_len, - new_name); - if (ret == 0) - recalculate_dentry_size(dentry); + if (!dentry->d_inode->verified) { + ret = verify_inode(dentry->d_inode, w); + if (ret != 0) + goto out; + } + + /* Cannot have a short name but no long name */ + if (dentry->short_name_len && !dentry->file_name_len) { + ERROR("Dentry `%s' has a short name but no long name", + dentry->full_path_utf8); + goto out; + } + + /* Make sure root dentry is unnamed */ + if (dentry_is_root(dentry)) { + if (dentry->file_name_len) { + ERROR("The root dentry is named `%s', but it must " + "be unnamed", dentry->file_name_utf8); + goto out; + } + } + +#if 0 + /* Check timestamps */ + if (inode->last_access_time < inode->creation_time || + inode->last_write_time < inode->creation_time) { + WARNING("Dentry `%s' was created after it was last accessed or " + "written to", dentry->full_path_utf8); + } +#endif + + ret = 0; +out: return ret; } -int change_ads_name(struct ads_entry *entry, const char *new_name) + +#ifdef WITH_FUSE +/* Returns the alternate data stream entry belonging to @inode that has the + * stream name @stream_name. */ +struct ads_entry *inode_get_ads_entry(struct inode *inode, + const char *stream_name, + u16 *idx_ret) { - return get_names(&entry->stream_name, &entry->stream_name_utf8, - &entry->stream_name_len, - &entry->stream_name_utf8_len, - new_name); + size_t stream_name_len; + if (!stream_name) + return NULL; + if (inode->num_ads) { + u16 i = 0; + stream_name_len = strlen(stream_name); + do { + if (ads_entry_has_name(&inode->ads_entries[i], + stream_name, stream_name_len)) + { + if (idx_ret) + *idx_ret = i; + return &inode->ads_entries[i]; + } + } while (++i != inode->num_ads); + } + return NULL; } +#endif -/* Parameters for calculate_dentry_statistics(). */ -struct image_statistics { - struct lookup_table *lookup_table; - u64 *dir_count; - u64 *file_count; - u64 *total_bytes; - u64 *hard_link_bytes; -}; - -static int calculate_dentry_statistics(struct dentry *dentry, void *arg) +#if defined(WITH_FUSE) || defined(WITH_NTFS_3G) +/* + * Add an alternate stream entry to an inode and return a pointer to it, or NULL + * if memory could not be allocated. + */ +struct ads_entry *inode_add_ads(struct inode *inode, const char *stream_name) { - struct image_statistics *stats; - struct lookup_table_entry *lte; - u16 i; - - stats = arg; + u16 num_ads; + struct ads_entry *ads_entries; + struct ads_entry *new_entry; - if (dentry_is_directory(dentry) && !dentry_is_root(dentry)) - ++*stats->dir_count; - else - ++*stats->file_count; + DEBUG("Add alternate data stream \"%s\"", stream_name); - lte = __lookup_resource(stats->lookup_table, dentry->hash); - i = 0; - while (1) { - if (lte) { - u64 size = lte->resource_entry.original_size; - *stats->total_bytes += size; - if (++lte->out_refcnt == 1) - *stats->hard_link_bytes += size; - } - if (i == dentry->num_ads) - break; - lte = __lookup_resource(stats->lookup_table, - dentry->ads_entries[i].hash); - i++; + if (inode->num_ads >= 0xfffe) { + ERROR("Too many alternate data streams in one inode!"); + return NULL; } + num_ads = inode->num_ads + 1; + ads_entries = REALLOC(inode->ads_entries, + num_ads * sizeof(inode->ads_entries[0])); + if (!ads_entries) { + ERROR("Failed to allocate memory for new alternate data stream"); + return NULL; + } + inode->ads_entries = ads_entries; - return 0; + new_entry = &inode->ads_entries[num_ads - 1]; + if (init_ads_entry(new_entry, stream_name) != 0) + return NULL; +#ifdef WITH_FUSE + new_entry->stream_id = inode->next_stream_id++; +#endif + inode->num_ads = num_ads; + return new_entry; } +#endif -void calculate_dir_tree_statistics(struct dentry *root, struct lookup_table *table, - u64 *dir_count_ret, u64 *file_count_ret, - u64 *total_bytes_ret, - u64 *hard_link_bytes_ret) +#ifdef WITH_FUSE +/* Remove an alternate data stream from the inode */ +void inode_remove_ads(struct inode *inode, u16 idx, + struct lookup_table *lookup_table) { - struct image_statistics stats; - *dir_count_ret = 0; - *file_count_ret = 0; - *total_bytes_ret = 0; - *hard_link_bytes_ret = 0; - stats.lookup_table = table; - stats.dir_count = dir_count_ret; - stats.file_count = file_count_ret; - stats.total_bytes = total_bytes_ret; - stats.hard_link_bytes = hard_link_bytes_ret; - for_lookup_table_entry(table, zero_out_refcnts, NULL); - for_dentry_in_tree(root, calculate_dentry_statistics, &stats); + struct ads_entry *ads_entry; + struct lookup_table_entry *lte; + + wimlib_assert(idx < inode->num_ads); + wimlib_assert(inode->resolved); + + ads_entry = &inode->ads_entries[idx]; + + DEBUG("Remove alternate data stream \"%s\"", ads_entry->stream_name_utf8); + + lte = ads_entry->lte; + if (lte) + lte_decrement_refcnt(lte, lookup_table); + + destroy_ads_entry(ads_entry); + + memcpy(&inode->ads_entries[idx], + &inode->ads_entries[idx + 1], + (inode->num_ads - idx - 1) * sizeof(inode->ads_entries[0])); + inode->num_ads--; } +#endif + -static int read_ads_entries(const u8 *p, struct dentry *dentry, + +/* + * Reads the alternate data stream entries for a dentry. + * + * @p: Pointer to buffer that starts with the first alternate stream entry. + * + * @inode: Inode to load the alternate data streams into. + * @inode->num_ads must have been set to the number of + * alternate data streams that are expected. + * + * @remaining_size: Number of bytes of data remaining in the buffer pointed + * to by @p. + * + * The format of the on-disk alternate stream entries is as follows: + * + * struct ads_entry_on_disk { + * u64 length; // Length of the entry, in bytes. This includes + * all fields (including the stream name and + * null terminator if present, AND the padding!). + * u64 reserved; // Seems to be unused + * u8 hash[20]; // SHA1 message digest of the uncompressed stream + * u16 stream_name_len; // Length of the stream name, in bytes + * char stream_name[]; // Stream name in UTF-16LE, @stream_name_len bytes long, + * not including null terminator + * u16 zero; // UTF-16 null terminator for the stream name, NOT + * included in @stream_name_len. Based on what + * I've observed from filenames in dentries, + * this field should not exist when + * (@stream_name_len == 0), but you can't + * actually tell because of the padding anyway + * (provided that the padding is zeroed, which + * it always seems to be). + * char padding[]; // Padding to make the size a multiple of 8 bytes. + * }; + * + * In addition, the entries are 8-byte aligned. + * + * Return 0 on success or nonzero on failure. On success, inode->ads_entries + * is set to an array of `struct ads_entry's of length inode->num_ads. On + * failure, @inode is not modified. + */ +static int read_ads_entries(const u8 *p, struct inode *inode, u64 remaining_size) { - u16 num_ads = dentry->num_ads; - struct ads_entry *ads_entries = CALLOC(num_ads, sizeof(struct ads_entry)); + u16 num_ads; + struct ads_entry *ads_entries; int ret; + + num_ads = inode->num_ads; + ads_entries = CALLOC(num_ads, sizeof(inode->ads_entries[0])); if (!ads_entries) { ERROR("Could not allocate memory for %"PRIu16" " "alternate data stream entries", num_ads); return WIMLIB_ERR_NOMEM; } - DEBUG2("Reading %"PRIu16" alternate data streams " - "(remaining size = %"PRIu64")", num_ads, remaining_size); for (u16 i = 0; i < num_ads; i++) { - struct ads_entry *cur_entry = &ads_entries[i]; + struct ads_entry *cur_entry; u64 length; + u64 length_no_padding; + u64 total_length; size_t utf8_len; - const char *p_save = p; + const u8 *p_save = p; + + cur_entry = &ads_entries[i]; + + #ifdef WITH_FUSE + ads_entries[i].stream_id = i + 1; + #endif + /* Read the base stream entry, excluding the stream name. */ if (remaining_size < WIM_ADS_ENTRY_DISK_SIZE) { ERROR("Stream entries go past end of metadata resource"); @@ -882,88 +1151,135 @@ static int read_ads_entries(const u8 *p, struct dentry *dentry, ret = WIMLIB_ERR_INVALID_DENTRY; goto out_free_ads_entries; } - remaining_size -= WIM_ADS_ENTRY_DISK_SIZE; - p = get_u64(p, &length); /* ADS entry length */ - - DEBUG2("ADS length = %"PRIu64, length); - - p += 8; /* Unused */ - p = get_bytes(p, WIM_HASH_SIZE, (u8*)cur_entry->hash); + p = get_u64(p, &length); + p += 8; /* Skip the reserved field */ + p = get_bytes(p, SHA1_HASH_SIZE, (u8*)cur_entry->hash); p = get_u16(p, &cur_entry->stream_name_len); - DEBUG2("Stream name length = %u", cur_entry->stream_name_len); - cur_entry->stream_name = NULL; cur_entry->stream_name_utf8 = NULL; - if (remaining_size < cur_entry->stream_name_len + 2) { + /* Length including neither the null terminator nor the padding + * */ + length_no_padding = WIM_ADS_ENTRY_DISK_SIZE + + cur_entry->stream_name_len; + + /* Length including the null terminator and the padding */ + total_length = ((length_no_padding + 2) + 7) & ~7; + + wimlib_assert(total_length == ads_entry_total_length(cur_entry)); + + if (remaining_size < length_no_padding) { ERROR("Stream entries go past end of metadata resource"); - ERROR("(remaining_size = %"PRIu64" bytes, stream_name_len " - "= %"PRIu16" bytes", remaining_size, - cur_entry->stream_name_len); + ERROR("(remaining_size = %"PRIu64" bytes, " + "length_no_padding = %"PRIu64" bytes)", + remaining_size, length_no_padding); ret = WIMLIB_ERR_INVALID_DENTRY; goto out_free_ads_entries; } - remaining_size -= cur_entry->stream_name_len + 2; - cur_entry->stream_name = MALLOC(cur_entry->stream_name_len); - if (!cur_entry->stream_name) { - ret = WIMLIB_ERR_NOMEM; + /* The @length field in the on-disk ADS entry is expected to be + * equal to @total_length, which includes all of the entry and + * the padding that follows it to align the next ADS entry to an + * 8-byte boundary. However, to be safe, we'll accept the + * length field as long as it's not less than the un-padded + * total length and not more than the padded total length. */ + if (length < length_no_padding || length > total_length) { + ERROR("Stream entry has unexpected length " + "field (length field = %"PRIu64", " + "unpadded total length = %"PRIu64", " + "padded total length = %"PRIu64")", + length, length_no_padding, total_length); + ret = WIMLIB_ERR_INVALID_DENTRY; goto out_free_ads_entries; } - get_bytes(p, cur_entry->stream_name_len, - (u8*)cur_entry->stream_name); - cur_entry->stream_name_utf8 = utf16_to_utf8(cur_entry->stream_name, - cur_entry->stream_name_len, - &utf8_len); - cur_entry->stream_name_utf8_len = utf8_len; - - if (!cur_entry->stream_name_utf8) { - ret = WIMLIB_ERR_NOMEM; - goto out_free_ads_entries; + + if (cur_entry->stream_name_len) { + cur_entry->stream_name = MALLOC(cur_entry->stream_name_len); + if (!cur_entry->stream_name) { + ret = WIMLIB_ERR_NOMEM; + goto out_free_ads_entries; + } + get_bytes(p, cur_entry->stream_name_len, + (u8*)cur_entry->stream_name); + cur_entry->stream_name_utf8 = utf16_to_utf8(cur_entry->stream_name, + cur_entry->stream_name_len, + &utf8_len); + cur_entry->stream_name_utf8_len = utf8_len; + + if (!cur_entry->stream_name_utf8) { + ret = WIMLIB_ERR_NOMEM; + goto out_free_ads_entries; + } } - p = p_save + ads_entry_length(cur_entry); + /* It's expected that the size of every ADS entry is a multiple + * of 8. However, to be safe, I'm allowing the possibility of + * an ADS entry at the very end of the metadata resource ending + * un-aligned. So although we still need to increment the input + * pointer by @total_length to reach the next ADS entry, it's + * possible that less than @total_length is actually remaining + * in the metadata resource. We should set the remaining size to + * 0 bytes if this happens. */ + p = p_save + total_length; + if (remaining_size < total_length) + remaining_size = 0; + else + remaining_size -= total_length; } - dentry->ads_entries = ads_entries; + inode->ads_entries = ads_entries; +#ifdef WITH_FUSE + inode->next_stream_id = inode->num_ads + 1; +#endif return 0; out_free_ads_entries: - for (u16 i = 0; i < num_ads; i++) { - FREE(ads_entries[i].stream_name); - FREE(ads_entries[i].stream_name_utf8); - } + for (u16 i = 0; i < num_ads; i++) + destroy_ads_entry(&ads_entries[i]); FREE(ads_entries); return ret; } /* - * Reads a directory entry from the metadata resource. + * Reads a directory entry, including all alternate data stream entries that + * follow it, from the WIM image's metadata resource. + * + * @metadata_resource: Buffer containing the uncompressed metadata resource. + * @metadata_resource_len: Length of the metadata resource. + * @offset: Offset of this directory entry in the metadata resource. + * @dentry: A `struct dentry' that will be filled in by this function. + * + * Return 0 on success or nonzero on failure. On failure, @dentry have been + * modified, bu it will be left with no pointers to any allocated buffers. + * On success, the dentry->length field must be examined. If zero, this was a + * special "end of directory" dentry and not a real dentry. If nonzero, this + * was a real dentry. */ int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len, u64 offset, struct dentry *dentry) { const u8 *p; u64 calculated_size; - char *file_name; - char *file_name_utf8; - char *short_name; + char *file_name = NULL; + char *file_name_utf8 = NULL; + char *short_name = NULL; u16 short_name_len; u16 file_name_len; - size_t file_name_utf8_len; + size_t file_name_utf8_len = 0; int ret; + struct inode *inode = NULL; dentry_common_init(dentry); /*Make sure the dentry really fits into the metadata resource.*/ - if (offset + 8 > metadata_resource_len) { + if (offset + 8 > metadata_resource_len || offset + 8 < offset) { ERROR("Directory entry starting at %"PRIu64" ends past the " "end of the metadata resource (size %"PRIu64")", offset, metadata_resource_len); return WIMLIB_ERR_INVALID_DENTRY; } - /* Before reading the whole entry, we need to read just the length. - * This is because an entry of length 8 (that is, just the length field) + /* Before reading the whole dentry, we need to read just the length. + * This is because a dentry of length 8 (that is, just the length field) * terminates the list of sibling directory entries. */ p = get_u64(&metadata_resource[offset], &dentry->length); @@ -971,11 +1287,17 @@ int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len, /* A zero length field (really a length of 8, since that's how big the * directory entry is...) indicates that this is the end of directory * dentry. We do not read it into memory as an actual dentry, so just - * return true in that case. */ + * return successfully in that case. */ if (dentry->length == 0) return 0; - if (offset + dentry->length >= metadata_resource_len) { + /* If the dentry does not overflow the metadata resource buffer and is + * not too short, read the rest of it (excluding the alternate data + * streams, but including the file name and short name variable-length + * fields) into memory. */ + if (offset + dentry->length >= metadata_resource_len + || offset + dentry->length < offset) + { ERROR("Directory entry at offset %"PRIu64" and with size " "%"PRIu64" ends past the end of the metadata resource " "(size %"PRIu64")", @@ -983,17 +1305,18 @@ int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len, return WIMLIB_ERR_INVALID_DENTRY; } - /* If it is a recognized length, read the rest of the directory entry. - * Note: The root directory entry has no name, and its length does not - * include the short name length field. */ if (dentry->length < WIM_DENTRY_DISK_SIZE) { ERROR("Directory entry has invalid length of %"PRIu64" bytes", dentry->length); return WIMLIB_ERR_INVALID_DENTRY; } - p = get_u32(p, &dentry->attributes); - p = get_u32(p, (u32*)&dentry->security_id); + inode = new_timeless_inode(); + if (!inode) + return WIMLIB_ERR_NOMEM; + + p = get_u32(p, &inode->attributes); + p = get_u32(p, (u32*)&inode->security_id); p = get_u64(p, &dentry->subdir_offset); /* 2 unused fields */ @@ -1001,11 +1324,11 @@ int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len, /*p = get_u64(p, &dentry->unused1);*/ /*p = get_u64(p, &dentry->unused2);*/ - p = get_u64(p, &dentry->creation_time); - p = get_u64(p, &dentry->last_access_time); - p = get_u64(p, &dentry->last_write_time); + p = get_u64(p, &inode->creation_time); + p = get_u64(p, &inode->last_access_time); + p = get_u64(p, &inode->last_write_time); - p = get_bytes(p, WIM_HASH_SIZE, dentry->hash); + p = get_bytes(p, SHA1_HASH_SIZE, inode->hash); /* * I don't know what's going on here. It seems like M$ screwed up the @@ -1013,107 +1336,129 @@ int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len, * document it. The WIM_HDR_FLAG_RP_FIX flag in the WIM header might * have something to do with this, but it's not documented. */ - if (dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT) { + if (inode->attributes & FILE_ATTRIBUTE_REPARSE_POINT) { /* ??? */ p += 4; - p = get_u32(p, &dentry->reparse_tag); + p = get_u32(p, &inode->reparse_tag); p += 4; } else { - p = get_u32(p, &dentry->reparse_tag); - p = get_u64(p, &dentry->hard_link); + p = get_u32(p, &inode->reparse_tag); + p = get_u64(p, &inode->ino); } /* By the way, the reparse_reserved field does not actually exist (at * least when the file is not a reparse point) */ - - p = get_u16(p, &dentry->num_ads); + p = get_u16(p, &inode->num_ads); p = get_u16(p, &short_name_len); p = get_u16(p, &file_name_len); - calculated_size = WIM_DENTRY_DISK_SIZE + file_name_len + 2 + - short_name_len; + /* We now know the length of the file name and short name. Make sure + * the length of the dentry is large enough to actually hold them. + * + * The calculated length here is unaligned to allow for the possibility + * that the dentry->length names an unaligned length, although this + * would be unexpected. */ + calculated_size = __dentry_correct_length_unaligned(file_name_len, + short_name_len); if (dentry->length < calculated_size) { ERROR("Unexpected end of directory entry! (Expected " - "%"PRIu64" bytes, got %"PRIu64" bytes. " + "at least %"PRIu64" bytes, got %"PRIu64" bytes. " "short_name_len = %hu, file_name_len = %hu)", calculated_size, dentry->length, short_name_len, file_name_len); return WIMLIB_ERR_INVALID_DENTRY; } - /* Read the filename. */ - file_name = MALLOC(file_name_len); - if (!file_name) { - ERROR("Failed to allocate %hu bytes for dentry file name", - file_name_len); - return WIMLIB_ERR_NOMEM; - } - p = get_bytes(p, file_name_len, file_name); + /* Read the filename if present. Note: if the filename is empty, there + * is no null terminator following it. */ + if (file_name_len) { + file_name = MALLOC(file_name_len); + if (!file_name) { + ERROR("Failed to allocate %hu bytes for dentry file name", + file_name_len); + return WIMLIB_ERR_NOMEM; + } + p = get_bytes(p, file_name_len, file_name); - /* Convert filename to UTF-8. */ - file_name_utf8 = utf16_to_utf8(file_name, file_name_len, - &file_name_utf8_len); + /* Convert filename to UTF-8. */ + file_name_utf8 = utf16_to_utf8(file_name, file_name_len, + &file_name_utf8_len); - if (!file_name_utf8) { - ERROR("Failed to allocate memory to convert UTF-16 " - "filename (%hu bytes) to UTF-8", file_name_len); - ret = WIMLIB_ERR_NOMEM; - goto out_free_file_name; + if (!file_name_utf8) { + ERROR("Failed to allocate memory to convert UTF-16 " + "filename (%hu bytes) to UTF-8", file_name_len); + ret = WIMLIB_ERR_NOMEM; + goto out_free_file_name; + } + if (*(u16*)p) + WARNING("Expected two zero bytes following the file name " + "`%s', but found non-zero bytes", file_name_utf8); + p += 2; } - /* Undocumented padding between file name and short name. This probably - * is supposed to be a terminating null character. */ - p += 2; - - /* Read the short filename. */ - short_name = MALLOC(short_name_len); - if (!short_name) { - ERROR("Failed to allocate %hu bytes for short filename", - short_name_len); - ret = WIMLIB_ERR_NOMEM; - goto out_free_file_name_utf8; + /* Align the calculated size */ + calculated_size = (calculated_size + 7) & ~7; + + if (dentry->length > calculated_size) { + /* Weird; the dentry says it's longer than it should be. Note + * that the length field does NOT include the size of the + * alternate stream entries. */ + + /* Strangely, some directory entries inexplicably have a little + * over 70 bytes of extra data. The exact amount of data seems + * to be 72 bytes, but it is aligned on the next 8-byte + * boundary. It does NOT seem to be alternate data stream + * entries. Here's an example of the aligned data: + * + * 01000000 40000000 6c786bba c58ede11 b0bb0026 1870892a b6adb76f + * e63a3e46 8fca8653 0d2effa1 6c786bba c58ede11 b0bb0026 1870892a + * 00000000 00000000 00000000 00000000 + * + * Here's one interpretation of how the data is laid out. + * + * struct unknown { + * u32 field1; (always 0x00000001) + * u32 field2; (always 0x40000000) + * u8 data[48]; (???) + * u64 reserved1; (always 0) + * u64 reserved2; (always 0) + * };*/ + DEBUG("Dentry for file or directory `%s' has %zu extra " + "bytes of data", + file_name_utf8, dentry->length - calculated_size); } - p = get_bytes(p, short_name_len, short_name); + /* Read the short filename if present. Note: if there is no short + * filename, there is no null terminator following it. */ + if (short_name_len) { + short_name = MALLOC(short_name_len); + if (!short_name) { + ERROR("Failed to allocate %hu bytes for short filename", + short_name_len); + ret = WIMLIB_ERR_NOMEM; + goto out_free_file_name_utf8; + } - /* Some directory entries inexplicibly have a little over 70 bytes of - * extra data. The exact amount of data seems to be 72 bytes, but it is - * aligned on the next 8-byte boundary. Here's an example of the - * aligned data: - * - * 01000000400000006c786bbac58ede11b0bb00261870892ab6adb76fe63a3 - * e468fca86530d2effa16c786bbac58ede11b0bb00261870892a0000000000 - * 0000000000000000000000 - * - * Here's one interpretation of how the data is laid out. - * - * struct unknown { - * u32 field1; (always 0x00000001) - * u32 field2; (always 0x40000000) - * u16 field3; - * u32 field4; - * u32 field5; - * u32 field6; - * u8 data[48]; (???) - * u64 reserved1; (always 0) - * u64 reserved2; (always 0) - * };*/ -#if 0 - if (dentry->length - calculated_size >= WIM_ADS_ENTRY_DISK_SIZE) { - printf("%s: %lu / %lu (", file_name_utf8, - calculated_size, dentry->length); - print_string(p + WIM_ADS_ENTRY_DISK_SIZE, dentry->length - calculated_size - WIM_ADS_ENTRY_DISK_SIZE); - puts(")"); - print_byte_field(p, dentry->length - calculated_size); - putchar('\n'); + p = get_bytes(p, short_name_len, short_name); + if (*(u16*)p) + WARNING("Expected two zero bytes following the file name " + "`%s', but found non-zero bytes", file_name_utf8); + p += 2; } -#endif - if (dentry->num_ads != 0) { - calculated_size = (calculated_size + 7) & ~7; + /* + * Read the alternate data streams, if present. dentry->num_ads tells + * us how many they are, and they will directly follow the dentry + * on-disk. + * + * Note that each alternate data stream entry begins on an 8-byte + * aligned boundary, and the alternate data stream entries are NOT + * included in the dentry->length field for some reason. + */ + if (inode->num_ads != 0) { if (calculated_size > metadata_resource_len - offset) { ERROR("Not enough space in metadata resource for " "alternate stream entries"); @@ -1121,12 +1466,15 @@ int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len, goto out_free_short_name; } ret = read_ads_entries(&metadata_resource[offset + calculated_size], - dentry, + inode, metadata_resource_len - offset - calculated_size); if (ret != 0) goto out_free_short_name; } + /* We've read all the data for this dentry. Set the names and their + * lengths, and we've done. */ + dentry->d_inode = inode; dentry->file_name = file_name; dentry->file_name_utf8 = file_name_utf8; dentry->short_name = short_name; @@ -1140,112 +1488,21 @@ out_free_file_name_utf8: FREE(file_name_utf8); out_free_file_name: FREE(file_name); +out_free_inode: + free_inode(inode); return ret; } -/* - * Writes a dentry to an output buffer. - * - * @dentry: The dentry structure. - * @p: The memory location to write the data to. - * @return: Pointer to the byte after the last byte we wrote as part of the - * dentry. - */ -static u8 *write_dentry(const struct dentry *dentry, u8 *p) -{ - u8 *orig_p = p; - unsigned padding; - - p = put_u64(p, dentry->length); - p = put_u32(p, dentry->attributes); - p = put_u32(p, dentry->security_id); - p = put_u64(p, dentry->subdir_offset); - p = put_u64(p, 0); /* unused1 */ - p = put_u64(p, 0); /* unused2 */ - p = put_u64(p, dentry->creation_time); - p = put_u64(p, dentry->last_access_time); - p = put_u64(p, dentry->last_write_time); - p = put_bytes(p, WIM_HASH_SIZE, dentry->hash); - if (dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT) { - p = put_zeroes(p, 4); - p = put_u32(p, dentry->reparse_tag); - p = put_zeroes(p, 4); - } else { - p = put_u32(p, dentry->reparse_tag); - p = put_u64(p, dentry->hard_link); - } - p = put_u16(p, dentry->num_ads); - p = put_u16(p, dentry->short_name_len); - p = put_u16(p, dentry->file_name_len); - p = put_bytes(p, dentry->file_name_len, (u8*)dentry->file_name); - p = put_u16(p, 0); /* filename padding, 2 bytes. */ - p = put_bytes(p, dentry->short_name_len, (u8*)dentry->short_name); - - wimlib_assert(p - orig_p <= dentry->length); - if (p - orig_p < dentry->length) - p = put_zeroes(p, dentry->length - (p - orig_p)); - - p = put_zeroes(p, (8 - (p - orig_p) % 8) % 8); - - for (u16 i = 0; i < dentry->num_ads; i++) { - p = put_u64(p, ads_entry_length(&dentry->ads_entries[i])); - p = put_u64(p, 0); /* Unused */ - p = put_bytes(p, WIM_HASH_SIZE, dentry->ads_entries[i].hash); - p = put_u16(p, dentry->ads_entries[i].stream_name_len); - p = put_bytes(p, dentry->ads_entries[i].stream_name_len, - (u8*)dentry->ads_entries[i].stream_name); - p = put_zeroes(p, (8 - (p - orig_p) % 8) % 8); - } - return p; -} - -/* Recursive function that writes a dentry tree rooted at @tree, not including - * @tree itself, which has already been written, except in the case of the root - * dentry, which is written right away, along with an end-of-directory entry. */ -u8 *write_dentry_tree(const struct dentry *tree, u8 *p) -{ - const struct dentry *child; - - if (dentry_is_root(tree)) { - p = write_dentry(tree, p); - - /* write end of directory entry */ - p = put_u64(p, 0); - } else { - /* Nothing to do for non-directories */ - if (!dentry_is_directory(tree)) - return p; - } - - /* Write child dentries and end-of-directory entry. */ - child = tree->children; - if (child) { - do { - p = write_dentry(child, p); - child = child->next; - } while (child != tree->children); - } - - /* write end of directory entry */ - p = put_u64(p, 0); - - /* Recurse on children. */ - if (child) { - do { - p = write_dentry_tree(child, p); - child = child->next; - } while (child != tree->children); - } - return p; -} - /* Reads the children of a dentry, and all their children, ..., etc. from the * metadata resource and into the dentry tree. * * @metadata_resource: An array that contains the uncompressed metadata * resource for the WIM file. - * @metadata_resource_len: The length of @metadata_resource. - * @dentry: A pointer to a struct dentry that is the root of the directory + * + * @metadata_resource_len: The length of the uncompressed metadata resource, in + * bytes. + * + * @dentry: A pointer to a `struct dentry' that is the root of the directory * tree and has already been read from the metadata resource. It * does not need to be the real root because this procedure is * called recursively. @@ -1262,8 +1519,12 @@ int read_dentry_tree(const u8 metadata_resource[], u64 metadata_resource_len, struct dentry cur_child; int ret; - /* If @dentry is a regular file, nothing more needs to be done for this - * branch. */ + /* + * If @dentry has no child dentries, nothing more needs to be done for + * this branch. This is the case for regular files, symbolic links, and + * *possibly* empty directories (although an empty directory may also + * have one child dentry that is the special end-of-directory dentry) + */ if (cur_offset == 0) return 0; @@ -1277,10 +1538,8 @@ int read_dentry_tree(const u8 metadata_resource[], u64 metadata_resource_len, break; /* Check for end of directory. */ - if (cur_child.length == 0) { - ret = 0; + if (cur_child.length == 0) break; - } /* Not end of directory. Allocate this child permanently and * link it to the parent and previous child. */ @@ -1302,6 +1561,7 @@ int read_dentry_tree(const u8 metadata_resource[], u64 metadata_resource_len, child->parent = dentry; prev_child = child; + inode_add_dentry(child, child->d_inode); /* If there are children of this child, call this procedure * recursively. */ @@ -1312,16 +1572,161 @@ int read_dentry_tree(const u8 metadata_resource[], u64 metadata_resource_len, break; } - /* Advance to the offset of the next child. */ + /* Advance to the offset of the next child. Note: We need to + * advance by the TOTAL length of the dentry, not by the length + * child->length, which although it does take into account the + * padding, it DOES NOT take into account alternate stream + * entries. */ cur_offset += dentry_total_length(child); } - /* Link last child to first one, and set parent's - * children pointer to the first child. */ + /* Link last child to first one, and set parent's children pointer to + * the first child. */ if (prev_child) { prev_child->next = first_child; first_child->prev = prev_child; } - dentry->children = first_child; + dentry->d_inode->children = first_child; return ret; } + +/* + * Writes a WIM dentry to an output buffer. + * + * @dentry: The dentry structure. + * @p: The memory location to write the data to. + * @return: Pointer to the byte after the last byte we wrote as part of the + * dentry. + */ +static u8 *write_dentry(const struct dentry *dentry, u8 *p) +{ + u8 *orig_p = p; + const u8 *hash; + const struct inode *inode = dentry->d_inode; + + /* We calculate the correct length of the dentry ourselves because the + * dentry->length field may been set to an unexpected value from when we + * read the dentry in (for example, there may have been unknown data + * appended to the end of the dentry...) */ + u64 length = dentry_correct_length(dentry); + + p = put_u64(p, length); + p = put_u32(p, inode->attributes); + p = put_u32(p, inode->security_id); + p = put_u64(p, dentry->subdir_offset); + p = put_u64(p, 0); /* unused1 */ + p = put_u64(p, 0); /* unused2 */ + p = put_u64(p, inode->creation_time); + p = put_u64(p, inode->last_access_time); + p = put_u64(p, inode->last_write_time); + hash = inode_stream_hash(inode, 0); + p = put_bytes(p, SHA1_HASH_SIZE, hash); + if (inode->attributes & FILE_ATTRIBUTE_REPARSE_POINT) { + p = put_zeroes(p, 4); + p = put_u32(p, inode->reparse_tag); + p = put_zeroes(p, 4); + } else { + u64 link_group_id; + p = put_u32(p, 0); + if (inode->link_count == 1) + link_group_id = 0; + else + link_group_id = inode->ino; + p = put_u64(p, link_group_id); + } + p = put_u16(p, inode->num_ads); + p = put_u16(p, dentry->short_name_len); + p = put_u16(p, dentry->file_name_len); + if (dentry->file_name_len) { + p = put_bytes(p, dentry->file_name_len, (u8*)dentry->file_name); + p = put_u16(p, 0); /* filename padding, 2 bytes. */ + } + if (dentry->short_name) { + p = put_bytes(p, dentry->short_name_len, (u8*)dentry->short_name); + p = put_u16(p, 0); /* short name padding, 2 bytes */ + } + + /* Align to 8-byte boundary */ + wimlib_assert(length >= (p - orig_p) && length - (p - orig_p) <= 7); + p = put_zeroes(p, length - (p - orig_p)); + + /* Write the alternate data streams, if there are any. Please see + * read_ads_entries() for comments about the format of the on-disk + * alternate data stream entries. */ + for (u16 i = 0; i < inode->num_ads; i++) { + p = put_u64(p, ads_entry_total_length(&inode->ads_entries[i])); + p = put_u64(p, 0); /* Unused */ + hash = inode_stream_hash(inode, i + 1); + p = put_bytes(p, SHA1_HASH_SIZE, hash); + p = put_u16(p, inode->ads_entries[i].stream_name_len); + if (inode->ads_entries[i].stream_name_len) { + p = put_bytes(p, inode->ads_entries[i].stream_name_len, + (u8*)inode->ads_entries[i].stream_name); + p = put_u16(p, 0); + } + p = put_zeroes(p, (8 - (p - orig_p) % 8) % 8); + } + wimlib_assert(p - orig_p == __dentry_total_length(dentry, length)); + return p; +} + +/* Recursive function that writes a dentry tree rooted at @parent, not including + * @parent itself, which has already been written. */ +static u8 *write_dentry_tree_recursive(const struct dentry *parent, u8 *p) +{ + const struct dentry *child; + + /* Nothing to do if this dentry has no children. */ + if (parent->subdir_offset == 0) + return p; + + /* Write child dentries and end-of-directory entry. + * + * Note: we need to write all of this dentry's children before + * recursively writing the directory trees rooted at each of the child + * dentries, since the on-disk dentries for a dentry's children are + * always located at consecutive positions in the metadata resource! */ + child = parent->d_inode->children; + if (child) { + do { + p = write_dentry(child, p); + child = child->next; + } while (child != parent->d_inode->children); + } + + /* write end of directory entry */ + p = put_u64(p, 0); + + /* Recurse on children. */ + if (child) { + do { + p = write_dentry_tree_recursive(child, p); + child = child->next; + } while (child != parent->d_inode->children); + } + return p; +} + +/* Writes a directory tree to the metadata resource. + * + * @root: Root of the dentry tree. + * @p: Pointer to a buffer with enough space for the dentry tree. + * + * Returns pointer to the byte after the last byte we wrote. + */ +u8 *write_dentry_tree(const struct dentry *root, u8 *p) +{ + wimlib_assert(dentry_is_root(root)); + + /* If we're the root dentry, we have no parent that already + * wrote us, so we need to write ourselves. */ + p = write_dentry(root, p); + + /* Write end of directory entry after the root dentry just to be safe; + * however the root dentry obviously cannot have any siblings. */ + p = put_u64(p, 0); + + /* Recursively write the rest of the dentry tree. */ + return write_dentry_tree_recursive(root, p); +} +