Merge branch 'master' into js/fmt-patch

[git.git] / delta.h

diff --git a/delta.h b/delta.h
index 31d1820..09b2e1e 100644 (file)
--- a/delta.h
+++ b/delta.h
@@ -2,11 +2,11 @@
 #define DELTA_H
 
 /* handling of delta buffers */
-extern void *diff_delta(void *from_buf, unsigned long from_size,
-                       void *to_buf, unsigned long to_size,
+extern void *diff_delta(const void *from_buf, unsigned long from_size,
+                       const void *to_buf, unsigned long to_size,
                        unsigned long *delta_size, unsigned long max_size);
 extern void *patch_delta(void *src_buf, unsigned long src_size,
-                        void *delta_buf, unsigned long delta_size,
+                        const void *delta_buf, unsigned long delta_size,
                         unsigned long *dst_size);
 
 /* the smallest possible delta size is 4 bytes */
@@ -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;
 }