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huff0: Faster 4x decompression #143

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Jul 28, 2019
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huff0: Faster 4x decompression #143

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6 changes: 5 additions & 1 deletion huff0/decompress.go
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Original file line number Diff line number Diff line change
Expand Up @@ -247,9 +247,13 @@ func (s *Scratch) Decompress4X(in []byte, dstSize int) (out []byte, err error) {
dstOut := s.Out
dstEvery := (dstSize + 3) / 4

const tlSize = 1 << tableLogMax
const tlMask = tlSize - 1
single := s.dt.single[:tlSize]

decode := func(br *bitReader) byte {
val := br.peekBitsFast(s.actualTableLog) /* note : actualTableLog >= 1 */
v := s.dt.single[val]
v := single[val&tlMask]
br.bitsRead += v.nBits
return v.byte
}
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