Fix compilation on newer NetBSD systems

[git.git] / delta.h

diff --git a/delta.h b/delta.h
index c6a4763..9464f3e 100644 (file)
--- a/delta.h
+++ b/delta.h
@@ -9,24 +9,25 @@ extern void *patch_delta(void *src_buf, unsigned long src_size,
                         void *delta_buf, unsigned long delta_size,
                         unsigned long *dst_size);
 
-/* the smallest possible delta size is 2 bytes (empty to empty) */
-#define DELTA_SIZE_MIN 2
+/* the smallest possible delta size is 4 bytes */
+#define DELTA_SIZE_MIN 4
 
 /*
  * 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;
 }