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-rw-r--r--patch-delta.c22
1 files changed, 3 insertions, 19 deletions
diff --git a/patch-delta.c b/patch-delta.c
index b68dd13..26281ea 100644
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -20,36 +20,20 @@ void *patch_delta(void *src_buf, unsigned long src_size,
const unsigned char *data, *top;
unsigned char *dst_buf, *out, cmd;
unsigned long size;
- int i;
- /* the smallest delta size possible is 4 bytes */
- if (delta_size < 4)
+ if (delta_size < DELTA_SIZE_MIN)
return NULL;
data = delta_buf;
top = delta_buf + delta_size;
/* make sure the orig file size matches what we expect */
- cmd = *data++;
- size = cmd & ~0x80;
- i = 7;
- while (cmd & 0x80) {
- cmd = *data++;
- size |= (cmd & ~0x80) << i;
- i += 7;
- }
+ size = get_delta_hdr_size(&data);
if (size != src_size)
return NULL;
/* now the result size */
- cmd = *data++;
- size = cmd & ~0x80;
- i = 7;
- while (cmd & 0x80) {
- cmd = *data++;
- size |= (cmd & ~0x80) << i;
- i += 7;
- }
+ size = get_delta_hdr_size(&data);
dst_buf = malloc(size);
if (!dst_buf)
return NULL;