GIT pack format
===============
-= pack-*.pack files have the following format:
+== pack-*.pack files have the following format:
- A header appears at the beginning and consists of the following:
(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
- The trailer records 20-byte SHA1 checksum of all of the above.
-= Original (version 1) pack-*.idx files have the following format:
+== Original (version 1) pack-*.idx files have the following format:
- The header consists of 256 4-byte network byte order
integers. N-th entry of this table records the number of
-= Version 2 pack-*.idx files support packs larger than 4 GiB, and
- have some other reorganizations. They have the format:
+== Version 2 pack-*.idx files support packs larger than 4 GiB, and
+ have some other reorganizations. They have the format:
- A 4-byte magic number '\377tOc' which is an unreasonable
fanout[0] value.