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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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34
diff-delta.c
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@ -228,28 +228,22 @@ void *diff_delta(void *from_buf, unsigned long from_size,
top = to_buf + to_size;
/* store reference buffer size */
orig = out + outpos++;
*orig = i = 0;
do {
if (from_size & 0xff) {
*orig |= (1 << i);
out[outpos++] = from_size;
}
i++;
from_size >>= 8;
} while (from_size);
out[outpos++] = from_size;
from_size >>= 7;
while (from_size) {
out[outpos - 1] |= 0x80;
out[outpos++] = from_size;
from_size >>= 7;
}
/* store target buffer size */
orig = out + outpos++;
*orig = i = 0;
do {
if (to_size & 0xff) {
*orig |= (1 << i);
out[outpos++] = to_size;
}
i++;
to_size >>= 8;
} while (to_size);
out[outpos++] = to_size;
to_size >>= 7;
while (to_size) {
out[outpos - 1] |= 0x80;
out[outpos++] = to_size;
to_size >>= 7;
}
inscnt = 0;
moff = 0;