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>
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17
diff-delta.c
17
diff-delta.c
@ -136,7 +136,8 @@ void *diff_delta(void *from_buf, unsigned long from_size,
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unsigned long *delta_size,
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unsigned long max_size)
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{
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unsigned int i, outpos, outsize, inscnt, hash_shift;
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unsigned int i, outpos, outsize, hash_shift;
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int inscnt;
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const unsigned char *ref_data, *ref_top, *data, *top;
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unsigned char *out;
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struct index *entry, **hash;
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@ -222,6 +223,20 @@ void *diff_delta(void *from_buf, unsigned long from_size,
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unsigned char *op;
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if (inscnt) {
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while (moff && ref_data[moff-1] == data[-1]) {
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if (msize == 0x10000)
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break;
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/* we can match one byte back */
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msize++;
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moff--;
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data--;
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outpos--;
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if (--inscnt)
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continue;
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outpos--; /* remove count slot */
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inscnt--; /* make it -1 */
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break;
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}
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out[outpos - inscnt - 1] = inscnt;
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inscnt = 0;
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}
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