diff options
| author |  Nicolas Pitre <nico@cam.org> | 2005-06-29 00:27:45 -0400 |
|---|---|---|
| committer |  Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-28 21:38:47 -0700 |
| commit | 69a2d426f0d249bca2c6f754b3c1283c0fa72fd4 (patch) | |
| tree | b71e760d5a5da66dda5170b9c2ad6073c10f9814 /patch-delta.c | |
| parent | [PATCH] Emit base objects of a delta chain when the delta is output. (diff) | |
| download | tgif-69a2d426f0d249bca2c6f754b3c1283c0fa72fd4.tar.xz | |
[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 'patch-delta.c')
| -rw-r--r-- | patch-delta.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/patch-delta.c b/patch-delta.c index a8d75ee1c8..b68dd13c63 100644 --- a/patch-delta.c +++ b/patch-delta.c @@ -22,33 +22,33 @@ void *patch_delta(void *src_buf, unsigned long src_size, unsigned long size; int i; - /* 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 NULL; data = delta_buf; top = delta_buf + delta_size; /* make sure the orig file size matches what we expect */ - size = i = 0; cmd = *data++; - while (cmd) { - if (cmd & 1) - size |= *data++ << i; - i += 8; - cmd >>= 1; + size = cmd & ~0x80; + i = 7; + while (cmd & 0x80) { + cmd = *data++; + size |= (cmd & ~0x80) << i; + i += 7; } if (size != src_size) return NULL; /* now the result size */ - size = i = 0; cmd = *data++; - while (cmd) { - if (cmd & 1) - size |= *data++ << i; - i += 8; - cmd >>= 1; + size = cmd & ~0x80; + i = 7; + while (cmd & 0x80) { + cmd = *data++; + size |= (cmd & ~0x80) << i; + i += 7; } dst_buf = malloc(size); if (!dst_buf) |