diff options
| -rw-r--r-- | sha1_file.c | 38 |
1 files changed, 18 insertions, 20 deletions
diff --git a/sha1_file.c b/sha1_file.c index 0bdaa16e7f..f6cf180bd4 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -592,6 +592,22 @@ void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned l return unpack_sha1_rest(&stream, hdr, *size); } +static unsigned long parse_delta_size(unsigned char **p) +{ + unsigned char c; + unsigned long size = 0; + unsigned shift = 0; + unsigned char *data = *p; + + do { + c = *data++; + size += (c & 0x7f) << shift; + shift += 7; + } while (c & 0x80); + *p = data; + return size; +} + static int packed_delta_info(unsigned char *base_sha1, unsigned long delta_size, unsigned long left, @@ -600,8 +616,6 @@ static int packed_delta_info(unsigned char *base_sha1, { unsigned char *data; unsigned char delta_head[64]; - int i; - unsigned char cmd; unsigned long data_size, result_size, base_size, verify_base_size; z_stream stream; int st; @@ -631,24 +645,8 @@ static int packed_delta_info(unsigned char *base_sha1, * the result size. Verify the base size while we are at it. */ data = delta_head; - verify_base_size = i = 0; - cmd = *data++; - while (cmd) { - if (cmd & 1) - verify_base_size |= *data++ << i; - i += 8; - cmd >>= 1; - } - - /* Read the result size */ - result_size = i = 0; - cmd = *data++; - while (cmd) { - if (cmd & 1) - result_size |= *data++ << i; - i += 8; - cmd >>= 1; - } + verify_base_size = parse_delta_size(&data); + result_size = parse_delta_size(&data); if (verify_base_size != base_size) die("delta base size mismatch"); |