Fix packed_delta_info() that was broken by the delta header packing change

Pointed out by Junio.

diff --git a/sha1_file.c b/sha1_file.c
index 0bdaa16..f6cf180 100644 (file)
--- 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");