diff options
Diffstat (limited to 'sha1_file.c')
| -rw-r--r-- | sha1_file.c | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/sha1_file.c b/sha1_file.c index 43bc2ea0c..51e07d5a4 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -646,8 +646,7 @@ int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long siz return memcmp(sha1, real_sha1, 20) ? -1 : 0; } -static void *map_sha1_file_internal(const unsigned char *sha1, - unsigned long *size) +void *map_sha1_file(const unsigned char *sha1, unsigned long *size) { struct stat st; void *map; @@ -684,10 +683,26 @@ static void *map_sha1_file_internal(const unsigned char *sha1, return map; } +int legacy_loose_object(unsigned char *map) +{ + unsigned int word; + + /* + * Is it a zlib-compressed buffer? If so, the first byte + * must be 0x78 (15-bit window size, deflated), and the + * first 16-bit word is evenly divisible by 31 + */ + word = (map[0] << 8) + map[1]; + if (map[0] == 0x78 && !(word % 31)) + return 1; + else + return 0; +} + static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) { unsigned char c; - unsigned int word, bits; + unsigned int bits; unsigned long size; static const char *typename[8] = { NULL, /* OBJ_EXT */ @@ -703,13 +718,7 @@ static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned lon stream->next_out = buffer; stream->avail_out = bufsiz; - /* - * Is it a zlib-compressed buffer? If so, the first byte - * must be 0x78 (15-bit window size, deflated), and the - * first 16-bit word is evenly divisible by 31 - */ - word = (map[0] << 8) + map[1]; - if (map[0] == 0x78 && !(word % 31)) { + if (legacy_loose_object(map)) { inflateInit(stream); return inflate(stream, 0); } @@ -1246,7 +1255,7 @@ int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep z_stream stream; char hdr[128]; - map = map_sha1_file_internal(sha1, &mapsize); + map = map_sha1_file(sha1, &mapsize); if (!map) { struct pack_entry e; @@ -1291,7 +1300,7 @@ void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size if (find_pack_entry(sha1, &e)) return read_packed_sha1(sha1, type, size); - map = map_sha1_file_internal(sha1, &mapsize); + map = map_sha1_file(sha1, &mapsize); if (map) { buf = unpack_sha1_file(map, mapsize, type, size); munmap(map, mapsize); @@ -1629,7 +1638,7 @@ int write_sha1_to_fd(int fd, const unsigned char *sha1) { int retval; unsigned long objsize; - void *buf = map_sha1_file_internal(sha1, &objsize); + void *buf = map_sha1_file(sha1, &objsize); if (buf) { retval = write_buffer(fd, buf, objsize); |