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[PATCH] denser delta header encoding

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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>
This commit is contained in:
Nicolas Pitre
2005-06-29 00:27:45 -04:00
committed by Linus Torvalds
parent 9d5ab9625d
commit 69a2d426f0
3 changed files with 37 additions and 46 deletions
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21
count-delta.c
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@ -11,16 +11,13 @@
static unsigned long get_hdr_size(const unsigned char **datap)
{
const unsigned char *data = *datap;
unsigned long size;
unsigned char cmd;
int i;
size = i = 0;
cmd = *data++;
while (cmd) {
if (cmd & 1)
size |= *data++ << i;
i += 8;
cmd >>= 1;
unsigned char cmd = *data++;
unsigned long size = cmd & ~0x80;
int i = 7;
while (cmd & 0x80) {
cmd = *data++;
size |= (cmd & ~0x80) << i;
i += 7;
}
*datap = data;
return size;
@ -47,8 +44,8 @@ int count_delta(void *delta_buf, unsigned long delta_size,
unsigned char cmd;
unsigned long src_size, dst_size, out;
/* the smallest delta size possible is 6 bytes */
if (delta_size < 6)
/* the smallest delta size possible is 4 bytes */
if (delta_size < 4)
return -1;
data = delta_buf;