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authorNicolas Pitre <nico@cam.org>2005-06-29 04:27:45 (GMT)
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-29 04:38:47 (GMT)
commit69a2d426f0d249bca2c6f754b3c1283c0fa72fd4 (patch)
treeb71e760d5a5da66dda5170b9c2ad6073c10f9814 /count-delta.c
parent9d5ab9625ddb53a68a99516225d0bcb39ec473d5 (diff)
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[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>
Diffstat (limited to 'count-delta.c')
-rw-r--r--count-delta.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/count-delta.c b/count-delta.c
index c7f3767..8901034 100644
--- a/count-delta.c
+++ b/count-delta.c
@@ -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;