Warn about invalid refs

[git.git] / delta.h

diff --git a/delta.h b/delta.h
index df97ff8..a15350d 100644 (file)
--- a/delta.h
+++ b/delta.h
@@ -4,18 +4,31 @@
 /* handling of delta buffers */
 extern void *diff_delta(void *from_buf, unsigned long from_size,
                        void *to_buf, unsigned long to_size,
-                       unsigned long *delta_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,
                         unsigned long *dst_size);
 
-/* handling of delta objects */
-struct delta;
-struct object_list;
-extern struct delta *lookup_delta(const unsigned char *sha1);
-extern int parse_delta_buffer(struct delta *item, void *buffer, unsigned long size);
-extern int parse_delta(struct delta *item, unsigned char sha1);
-extern int process_deltas(void *src, unsigned long src_size,
-                         const char *src_type, struct object_list *delta);
+/* 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)
+{
+       const unsigned char *data = *datap;
+       unsigned char cmd;
+       unsigned long size = 0;
+       int i = 0;
+       do {
+               cmd = *data++;
+               size |= (cmd & ~0x80) << i;
+               i += 7;
+       } while (cmd & 0x80);
+       *datap = data;
+       return size;
+}
 
 #endif