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-rw-r--r--patch-delta.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/patch-delta.c b/patch-delta.c
index a8d75ee1c..b68dd13c6 100644
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -22,33 +22,33 @@ void *patch_delta(void *src_buf, unsigned long src_size,
unsigned long size;
int i;
- /* the smallest delta size possible is 6 bytes */
- if (delta_size < 6)
+ /* the smallest delta size possible is 4 bytes */
+ if (delta_size < 4)
return NULL;
data = delta_buf;
top = delta_buf + delta_size;
/* make sure the orig file size matches what we expect */
- size = i = 0;
cmd = *data++;
- while (cmd) {
- if (cmd & 1)
- size |= *data++ << i;
- i += 8;
- cmd >>= 1;
+ size = cmd & ~0x80;
+ i = 7;
+ while (cmd & 0x80) {
+ cmd = *data++;
+ size |= (cmd & ~0x80) << i;
+ i += 7;
}
if (size != src_size)
return NULL;
/* now the result size */
- size = i = 0;
cmd = *data++;
- while (cmd) {
- if (cmd & 1)
- size |= *data++ << i;
- i += 8;
- cmd >>= 1;
+ size = cmd & ~0x80;
+ i = 7;
+ while (cmd & 0x80) {
+ cmd = *data++;
+ size |= (cmd & ~0x80) << i;
+ i += 7;
}
dst_buf = malloc(size);
if (!dst_buf)