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authorNicolas Pitre <nico@cam.org>2006-02-09 17:50:04 -0500
committerJunio C Hamano <junkio@cox.net>2006-02-09 21:06:38 -0800
commitd60fc1c8649f80c006b9f493c542461e81608d4b (patch)
treed481762cf3c8954e9bc635c61127b77342ae79d0 /pack.h
parent67d42212ff104aaafa97b943cb369b8444f61581 (diff)
downloadgit-d60fc1c8649f80c006b9f493c542461e81608d4b.tar.gz
git-d60fc1c8649f80c006b9f493c542461e81608d4b.tar.xz
remove delta-against-self bit
After experimenting with code to add the ability to encode a delta against part of the deltified file, it turns out that resulting packs are _bigger_ than when this ability is not used. The raw delta output might be smaller, but it doesn't compress as well using gzip with a negative net saving on average. Said bit would in fact be more useful to allow for encoding the copying of chunks larger than 64KB providing more savings with large files. This will correspond to packs version 3. While the current code still produces packs version 2, it is made future proof so pack versions 2 and 3 are accepted. Any pack version 2 are compatible with version 3 since the redefined bit was never used before. When enough time has passed, code to use that bit to produce version 3 packs could be added. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'pack.h')
-rw-r--r--pack.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/pack.h b/pack.h
index 657deaa3f..9dafa2b6d 100644
--- a/pack.h
+++ b/pack.h
@@ -21,6 +21,7 @@ enum object_type {
*/
#define PACK_SIGNATURE 0x5041434b /* "PACK" */
#define PACK_VERSION 2
+#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
struct pack_header {
unsigned int hdr_signature;
unsigned int hdr_version;