From 9de328fea951eca9524feaa5eb55762467df6b98 Mon Sep 17 00:00:00 2001 From: Peter Eriksen Date: Sun, 6 Apr 2008 22:51:49 +0200 Subject: [PATCH] Add description of OFS_DELTA to the pack format description Signed-off-by: Peter Eriksen Acked-by: Shawn O. Pearce Signed-off-by: Junio C Hamano --- Documentation/technical/pack-format.txt | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/Documentation/technical/pack-format.txt b/Documentation/technical/pack-format.txt index aa87756a5..1803e64e4 100644 --- a/Documentation/technical/pack-format.txt +++ b/Documentation/technical/pack-format.txt @@ -103,10 +103,24 @@ Pack file entry: <+ packed object data: If it is not DELTA, then deflated bytes (the size above is the size before compression). - If it is DELTA, then + If it is REF_DELTA, then 20-byte base object name SHA1 (the size above is the size of the delta data that follows). delta data, deflated. + If it is OFS_DELTA, then + n-byte offset (see below) interpreted as a negative + offset from the type-byte of the header of the + ofs-delta entry (the size above is the size of + the delta data that follows). + delta data, deflated. + + offset encoding: + n bytes with MSB set in all but the last one. + The offset is then the number constructed by + concatenating the lower 7 bit of each byte, and + for n >= 2 adding 2^7 + 2^14 + ... + 2^(7*(n-1)) + to the result. + = Version 2 pack-*.idx files support packs larger than 4 GiB, and -- 2.30.2