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It consists of two files, with the following format:
.histpack
The pack itself is a series of file revisions with some basic header
information on each.
datapack = <version: 1 byte>
[<filesection>,...]
filesection = <filename len: 2 byte unsigned int>
<filename>
<revision count: 4 byte unsigned int>
[<revision>,...]
revision = <node: 20 byte>
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filepath of the other file.
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The index file provides a mapping from filename to the file section in
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within each file. It consists of three parts, the fanout, the file index
and the node indexes.
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per file section in the pack). Each entry has:
- node (The 20 byte hash of the filename)
- pack entry offset (The location of this file section in the histpack)
- pack content size (The on-disk length of this file section's pack
data)
- node index offset (The location of the file's node index in the index
file) [1]
- node index size (the on-disk length of this file's node index) [1]
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bisecting the index. It is a series of 4 byte pointers to positions
within the index. It has 2^16 entries, which corresponds to hash
prefixes [00, 01, 02,..., FD, FE, FF]. Example: the pointer in slot 4F
points to the index position of the first revision whose node starts
with 4F. This saves log(2^16) bisect steps.
dataidx = <fanouttable>
<file count: 8 byte unsigned> [1]
<fileindex>
<node count: 8 byte unsigned> [1]
[<nodeindex>,...] [1]
fanouttable = [<index offset: 4 byte unsigned int>,...] (2^16 entries)
fileindex = [<file index entry>,...]
fileindexentry = <node: 20 byte>
<pack file section offset: 8 byte unsigned int>
<pack file section size: 8 byte unsigned int>
<node index offset: 4 byte unsigned int> [1]
<node index size: 4 byte unsigned int> [1]
nodeindex = <filename>[<node index entry>,...] [1]
filename = <filename len : 2 byte unsigned int><filename value> [1]
nodeindexentry = <node: 20 byte> [1]
<pack file node offset: 8 byte unsigned int> [1]
[1]: new in version 1.
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