3% tighter packs for free

This patch makes for 3.4% smaller pack with the git repository, and
a bit more than 3% smaller pack with the kernel repository.

And so with _no_ measurable CPU difference.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
pull/288/head
Nicolas Pitre 17 years ago committed by Junio C Hamano
parent 71bb10336f
commit 5a1fb2ca92
  1. 17
      diff-delta.c

@ -136,7 +136,8 @@ void *diff_delta(void *from_buf, unsigned long from_size,
unsigned long *delta_size,
unsigned long max_size)
{
unsigned int i, outpos, outsize, inscnt, hash_shift;
unsigned int i, outpos, outsize, hash_shift;
int inscnt;
const unsigned char *ref_data, *ref_top, *data, *top;
unsigned char *out;
struct index *entry, **hash;
@ -222,6 +223,20 @@ void *diff_delta(void *from_buf, unsigned long from_size,
unsigned char *op;
if (inscnt) {
while (moff && ref_data[moff-1] == data[-1]) {
if (msize == 0x10000)
break;
/* we can match one byte back */
msize++;
moff--;
data--;
outpos--;
if (--inscnt)
continue;
outpos--; /* remove count slot */
inscnt--; /* make it -1 */
break;
}
out[outpos - inscnt - 1] = inscnt;
inscnt = 0;
}

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