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Add description of OFS_DELTA to the pack format description

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Signed-off-by: Peter Eriksen <s022018@student.dtu.dk>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Peter Eriksen 2008-04-06 22:51:49 +02:00 committed by Junio C Hamano
parent ba1333fec3
commit 9de328fea9
1 changed files with 15 additions and 1 deletions
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16
Documentation/technical/pack-format.txt
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@ -103,10 +103,24 @@ Pack file entry: <+
packed object data: packed object data:
If it is not DELTA, then deflated bytes (the size above If it is not DELTA, then deflated bytes (the size above
is the size before compression). 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 20-byte base object name SHA1 (the size above is the
size of the delta data that follows). size of the delta data that follows).
delta data, deflated. 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 = Version 2 pack-*.idx files support packs larger than 4 GiB, and