diff options
Diffstat (limited to 'read-cache.c')
| -rw-r--r-- | read-cache.c | 83 |
1 files changed, 32 insertions, 51 deletions
diff --git a/read-cache.c b/read-cache.c index 27e9fc6ee8..a51bba1b95 100644 --- a/read-cache.c +++ b/read-cache.c @@ -1224,29 +1224,18 @@ int read_index(struct index_state *istate) return read_index_from(istate, get_index_file()); } -static void convert_from_disk(struct ondisk_cache_entry *ondisk, struct cache_entry *ce) +static struct cache_entry *create_from_disk(struct ondisk_cache_entry *ondisk) { + struct cache_entry *ce; size_t len; const char *name; + unsigned int flags; - ce->ce_ctime.sec = ntohl(ondisk->ctime.sec); - ce->ce_mtime.sec = ntohl(ondisk->mtime.sec); - ce->ce_ctime.nsec = ntohl(ondisk->ctime.nsec); - ce->ce_mtime.nsec = ntohl(ondisk->mtime.nsec); - ce->ce_dev = ntohl(ondisk->dev); - ce->ce_ino = ntohl(ondisk->ino); - ce->ce_mode = ntohl(ondisk->mode); - ce->ce_uid = ntohl(ondisk->uid); - ce->ce_gid = ntohl(ondisk->gid); - ce->ce_size = ntohl(ondisk->size); /* On-disk flags are just 16 bits */ - ce->ce_flags = ntohs(ondisk->flags); - - hashcpy(ce->sha1, ondisk->sha1); + flags = ntohs(ondisk->flags); + len = flags & CE_NAMEMASK; - len = ce->ce_flags & CE_NAMEMASK; - - if (ce->ce_flags & CE_EXTENDED) { + if (flags & CE_EXTENDED) { struct ondisk_cache_entry_extended *ondisk2; int extended_flags; ondisk2 = (struct ondisk_cache_entry_extended *)ondisk; @@ -1254,7 +1243,7 @@ static void convert_from_disk(struct ondisk_cache_entry *ondisk, struct cache_en /* We do not yet understand any bit out of CE_EXTENDED_FLAGS */ if (extended_flags & ~CE_EXTENDED_FLAGS) die("Unknown index entry format %08x", extended_flags); - ce->ce_flags |= extended_flags; + flags |= extended_flags; name = ondisk2->name; } else @@ -1262,25 +1251,26 @@ static void convert_from_disk(struct ondisk_cache_entry *ondisk, struct cache_en if (len == CE_NAMEMASK) len = strlen(name); - /* - * NEEDSWORK: If the original index is crafted, this copy could - * go unchecked. - */ - memcpy(ce->name, name, len + 1); -} -static inline size_t estimate_cache_size(size_t ondisk_size, unsigned int entries) -{ - size_t fix_size_mem = offsetof(struct cache_entry, name); - size_t fix_size_dsk = offsetof(struct ondisk_cache_entry, name); - long per_entry = (fix_size_mem - fix_size_dsk + 7) & ~7; + ce = xmalloc(cache_entry_size(len)); - /* - * Alignment can cause differences. This should be "alignof", but - * since that's a gcc'ism, just use the size of a pointer. - */ - per_entry += sizeof(void *); - return ondisk_size + entries*per_entry; + ce->ce_ctime.sec = ntohl(ondisk->ctime.sec); + ce->ce_mtime.sec = ntohl(ondisk->mtime.sec); + ce->ce_ctime.nsec = ntohl(ondisk->ctime.nsec); + ce->ce_mtime.nsec = ntohl(ondisk->mtime.nsec); + ce->ce_dev = ntohl(ondisk->dev); + ce->ce_ino = ntohl(ondisk->ino); + ce->ce_mode = ntohl(ondisk->mode); + ce->ce_uid = ntohl(ondisk->uid); + ce->ce_gid = ntohl(ondisk->gid); + ce->ce_size = ntohl(ondisk->size); + ce->ce_flags = flags; + + hashcpy(ce->sha1, ondisk->sha1); + + memcpy(ce->name, name, len); + ce->name[len] = '\0'; + return ce; } /* remember to discard_cache() before reading a different cache! */ @@ -1288,7 +1278,7 @@ int read_index_from(struct index_state *istate, const char *path) { int fd, i; struct stat st; - unsigned long src_offset, dst_offset; + unsigned long src_offset; struct cache_header *hdr; void *mmap; size_t mmap_size; @@ -1327,29 +1317,18 @@ int read_index_from(struct index_state *istate, const char *path) istate->cache_nr = ntohl(hdr->hdr_entries); istate->cache_alloc = alloc_nr(istate->cache_nr); istate->cache = xcalloc(istate->cache_alloc, sizeof(struct cache_entry *)); - - /* - * The disk format is actually larger than the in-memory format, - * due to space for nsec etc, so even though the in-memory one - * has room for a few more flags, we can allocate using the same - * index size - */ - istate->alloc = xmalloc(estimate_cache_size(mmap_size, istate->cache_nr)); istate->initialized = 1; src_offset = sizeof(*hdr); - dst_offset = 0; for (i = 0; i < istate->cache_nr; i++) { struct ondisk_cache_entry *disk_ce; struct cache_entry *ce; disk_ce = (struct ondisk_cache_entry *)((char *)mmap + src_offset); - ce = (struct cache_entry *)((char *)istate->alloc + dst_offset); - convert_from_disk(disk_ce, ce); + ce = create_from_disk(disk_ce); set_index_entry(istate, i, ce); src_offset += ondisk_ce_size(ce); - dst_offset += ce_size(ce); } istate->timestamp.sec = st.st_mtime; istate->timestamp.nsec = ST_MTIME_NSEC(st); @@ -1383,11 +1362,15 @@ unmap: int is_index_unborn(struct index_state *istate) { - return (!istate->cache_nr && !istate->alloc && !istate->timestamp.sec); + return (!istate->cache_nr && !istate->timestamp.sec); } int discard_index(struct index_state *istate) { + int i; + + for (i = 0; i < istate->cache_nr; i++) + free(istate->cache[i]); resolve_undo_clear_index(istate); istate->cache_nr = 0; istate->cache_changed = 0; @@ -1396,8 +1379,6 @@ int discard_index(struct index_state *istate) istate->name_hash_initialized = 0; free_hash(&istate->name_hash); cache_tree_free(&(istate->cache_tree)); - free(istate->alloc); - istate->alloc = NULL; istate->initialized = 0; /* no need to throw away allocated active_cache */ |