Commit 962537a3 authored by Junio C Hamano's avatar Junio C Hamano

diff-delta.c: allow delta with empty blob.

Delta computation with an empty blob used to punt and returned NULL.
This commit allows creation with empty blob; all combination of
empty->empty, empty->something, and something->empty are allowed.
Signed-off-by: default avatarJunio C Hamano <>
parent e726715a
......@@ -9,8 +9,8 @@ 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 4 bytes */
#define DELTA_SIZE_MIN 4
/* the smallest possible delta size is 2 bytes (empty to empty) */
#define DELTA_SIZE_MIN 2
* This must be called twice on the delta data buffer, first to get the
......@@ -213,7 +213,7 @@ void *diff_delta(void *from_buf, unsigned long from_size,
bdrecord_t *brec;
bdfile_t bdf;
if (!from_size || !to_size || delta_prepare(from_buf, from_size, &bdf))
if (delta_prepare(from_buf, from_size, &bdf))
return NULL;
outpos = 0;
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