Commit 06cb843f authored by Stefan Saasen's avatar Stefan Saasen Committed by Junio C Hamano

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

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: default avatarStefan Saasen <>
Signed-off-by: default avatarJunio C Hamano <>
parent 2137ce01
......@@ -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
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