builtin-grep: allow more than one patterns.

diff --git a/delta.h b/delta.h
index 31d1820f80f2887d51808170fc86585ada42d42e..9464f3e9b08b959d11305688ce194867a4017817 100644 (file)
--- a/delta.h
+++ b/delta.h
@@ -16,17 +16,18 @@ extern void *patch_delta(void *src_buf, unsigned long src_size,
  * This must be called twice on the delta data buffer, first to get the
  * expected reference buffer size, and again to get the result buffer size.
  */
-static inline unsigned long get_delta_hdr_size(const unsigned char **datap)
+static inline unsigned long get_delta_hdr_size(const unsigned char **datap,
+                                              const unsigned char *top)
 {
        const unsigned char *data = *datap;
-       unsigned char cmd = *data++;
-       unsigned long size = cmd & ~0x80;
-       int i = 7;
-       while (cmd & 0x80) {
+       unsigned char cmd;
+       unsigned long size = 0;
+       int i = 0;
+       do {
                cmd = *data++;
                size |= (cmd & ~0x80) << i;
                i += 7;
-       }
+       } while (cmd & 0x80 && data < top);
        *datap = data;
        return size;
 }