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Merge pull request #1384 from ulikunitz/dev

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Clarify special case of offset history update
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Yann Collet
2018-10-23 14:34:58 -07:00
committed by GitHub
parent ca46afd72b f0fe9b0f02
commit 059aa1b8f1
1 changed files with 4 additions and 0 deletions
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doc/zstd_compression_format.md
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@@ -919,6 +919,10 @@ This means that when `Repeated_Offset1` (most recent) is used, history is unmodi
When `Repeated_Offset2` is used, it's swapped with `Repeated_Offset1`. When `Repeated_Offset2` is used, it's swapped with `Repeated_Offset1`.
If any other offset is used, it becomes `Repeated_Offset1` and the rest are shift back by one. If any other offset is used, it becomes `Repeated_Offset1` and the rest are shift back by one.
In the case of an `offset_value` of 3 and the literal length of the current
sequence is zero the value `Repeated_Offset1 - 1_byte` is a new offset,
becoming the lead of the offset history and the first two repeated offsets will
be shifted back.
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