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Documentation: distinguish between ref and offset deltas in pack-format

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eb32d236 introduced the OBJ_OFS_DELTA object that uses a relative offset to
identify the base object instead of the 20-byte SHA1 reference. The pack file
documentation only mentions the SHA1 based reference in its description of the
deltified object entry.

Update the pack format documentation to clarify that the deltified object
representation refers to its base using either a relative negative offset or
the absolute SHA1 identifier.

Signed-off-by: Stefan Saasen <ssaasen@atlassian.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Stefan Saasen 2013-04-12 15:56:24 +10:00 committed by Junio C Hamano
parent 2137ce01f8
commit 06cb843fea
1 changed files with 3 additions and 1 deletions
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Documentation/technical/pack-format.txt
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@ -26,7 +26,9 @@ GIT pack format
(deltified representation)
n-byte type and length (3-bit type, (n-1)*7+4-bit length)
20-byte base object name
20-byte base object name if OBJ_REF_DELTA or a negative relative
offset from the delta object's position in the pack if this
is an OBJ_OFS_DELTA object
compressed delta data
Observation: length of each object is encoded in a variable