[PATCH] denser delta header encoding
Since the delta data format is not tied to any actual git object
anymore, now is the time to add a small improvement to the delta data
header as it is been done for packed object header. This patch allows
for reducing the delta header of about 2 bytes and makes for simpler
code.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/diff-delta.c b/diff-delta.c
index fd9b37f..67f6081 100644
--- a/diff-delta.c
+++ b/diff-delta.c
@@ -228,28 +228,22 @@
top = to_buf + to_size;
/* store reference buffer size */
- orig = out + outpos++;
- *orig = i = 0;
- do {
- if (from_size & 0xff) {
- *orig |= (1 << i);
- out[outpos++] = from_size;
- }
- i++;
- from_size >>= 8;
- } while (from_size);
+ out[outpos++] = from_size;
+ from_size >>= 7;
+ while (from_size) {
+ out[outpos - 1] |= 0x80;
+ out[outpos++] = from_size;
+ from_size >>= 7;
+ }
/* store target buffer size */
- orig = out + outpos++;
- *orig = i = 0;
- do {
- if (to_size & 0xff) {
- *orig |= (1 << i);
- out[outpos++] = to_size;
- }
- i++;
- to_size >>= 8;
- } while (to_size);
+ out[outpos++] = to_size;
+ to_size >>= 7;
+ while (to_size) {
+ out[outpos - 1] |= 0x80;
+ out[outpos++] = to_size;
+ to_size >>= 7;
+ }
inscnt = 0;
moff = 0;
