diff options
Diffstat (limited to 'sha1_file.c')
| -rw-r--r-- | sha1_file.c | 132 |
1 files changed, 90 insertions, 42 deletions
diff --git a/sha1_file.c b/sha1_file.c index d86a8db69a..d949b35c33 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -13,6 +13,7 @@ #include "commit.h" #include "tag.h" #include "tree.h" +#include "tree-walk.h" #include "refs.h" #include "pack-revindex.h" #include "sha1-lookup.h" @@ -37,6 +38,41 @@ const unsigned char null_sha1[20]; static int git_open_noatime(const char *name, struct packed_git *p); +/* + * This is meant to hold a *small* number of objects that you would + * want read_sha1_file() to be able to return, but yet you do not want + * to write them into the object store (e.g. a browse-only + * application). + */ +static struct cached_object { + unsigned char sha1[20]; + enum object_type type; + void *buf; + unsigned long size; +} *cached_objects; +static int cached_object_nr, cached_object_alloc; + +static struct cached_object empty_tree = { + EMPTY_TREE_SHA1_BIN_LITERAL, + OBJ_TREE, + "", + 0 +}; + +static struct cached_object *find_cached_object(const unsigned char *sha1) +{ + int i; + struct cached_object *co = cached_objects; + + for (i = 0; i < cached_object_nr; i++, co++) { + if (!hashcmp(co->sha1, sha1)) + return co; + } + if (!hashcmp(sha1, empty_tree.sha1)) + return &empty_tree; + return NULL; +} + int safe_create_leading_directories(char *path) { char *pos = path + offset_1st_component(path); @@ -1985,9 +2021,17 @@ static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *size int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) { + struct cached_object *co; struct pack_entry e; int status; + co = find_cached_object(sha1); + if (co) { + if (sizep) + *sizep = co->size; + return co->type; + } + if (!find_pack_entry(sha1, &e)) { /* Most likely it's a loose object. */ status = sha1_loose_object_info(sha1, sizep); @@ -2033,41 +2077,6 @@ static void *read_packed_sha1(const unsigned char *sha1, return data; } -/* - * This is meant to hold a *small* number of objects that you would - * want read_sha1_file() to be able to return, but yet you do not want - * to write them into the object store (e.g. a browse-only - * application). - */ -static struct cached_object { - unsigned char sha1[20]; - enum object_type type; - void *buf; - unsigned long size; -} *cached_objects; -static int cached_object_nr, cached_object_alloc; - -static struct cached_object empty_tree = { - EMPTY_TREE_SHA1_BIN, - OBJ_TREE, - "", - 0 -}; - -static struct cached_object *find_cached_object(const unsigned char *sha1) -{ - int i; - struct cached_object *co = cached_objects; - - for (i = 0; i < cached_object_nr; i++, co++) { - if (!hashcmp(co->sha1, sha1)) - return co; - } - if (!hashcmp(sha1, empty_tree.sha1)) - return &empty_tree; - return NULL; -} - int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, unsigned char *sha1) { @@ -2471,8 +2480,37 @@ int has_sha1_file(const unsigned char *sha1) return has_loose_object(sha1); } +static void check_tree(const void *buf, size_t size) +{ + struct tree_desc desc; + struct name_entry entry; + + init_tree_desc(&desc, buf, size); + while (tree_entry(&desc, &entry)) + /* do nothing + * tree_entry() will die() on malformed entries */ + ; +} + +static void check_commit(const void *buf, size_t size) +{ + struct commit c; + memset(&c, 0, sizeof(c)); + if (parse_commit_buffer(&c, buf, size)) + die("corrupt commit"); +} + +static void check_tag(const void *buf, size_t size) +{ + struct tag t; + memset(&t, 0, sizeof(t)); + if (parse_tag_buffer(&t, buf, size)) + die("corrupt tag"); +} + static int index_mem(unsigned char *sha1, void *buf, size_t size, - int write_object, enum object_type type, const char *path) + int write_object, enum object_type type, + const char *path, int format_check) { int ret, re_allocated = 0; @@ -2490,6 +2528,14 @@ static int index_mem(unsigned char *sha1, void *buf, size_t size, re_allocated = 1; } } + if (format_check) { + if (type == OBJ_TREE) + check_tree(buf, size); + if (type == OBJ_COMMIT) + check_commit(buf, size); + if (type == OBJ_TAG) + check_tag(buf, size); + } if (write_object) ret = write_sha1_file(buf, size, typename(type), sha1); @@ -2503,7 +2549,7 @@ static int index_mem(unsigned char *sha1, void *buf, size_t size, #define SMALL_FILE_SIZE (32*1024) int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, - enum object_type type, const char *path) + enum object_type type, const char *path, int format_check) { int ret; size_t size = xsize_t(st->st_size); @@ -2512,23 +2558,25 @@ int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, struct strbuf sbuf = STRBUF_INIT; if (strbuf_read(&sbuf, fd, 4096) >= 0) ret = index_mem(sha1, sbuf.buf, sbuf.len, write_object, - type, path); + type, path, format_check); else ret = -1; strbuf_release(&sbuf); } else if (!size) { - ret = index_mem(sha1, NULL, size, write_object, type, path); + ret = index_mem(sha1, NULL, size, write_object, type, path, + format_check); } else if (size <= SMALL_FILE_SIZE) { char *buf = xmalloc(size); if (size == read_in_full(fd, buf, size)) ret = index_mem(sha1, buf, size, write_object, type, - path); + path, format_check); else ret = error("short read %s", strerror(errno)); free(buf); } else { void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); - ret = index_mem(sha1, buf, size, write_object, type, path); + ret = index_mem(sha1, buf, size, write_object, type, path, + format_check); munmap(buf, size); } close(fd); @@ -2546,7 +2594,7 @@ int index_path(unsigned char *sha1, const char *path, struct stat *st, int write if (fd < 0) return error("open(\"%s\"): %s", path, strerror(errno)); - if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) + if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path, 0) < 0) return error("%s: failed to insert into database", path); break; |