diff options
Diffstat (limited to 'vendor/github.com/klauspost/compress/flate/deflate.go')
| -rw-r--r-- | vendor/github.com/klauspost/compress/flate/deflate.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/vendor/github.com/klauspost/compress/flate/deflate.go b/vendor/github.com/klauspost/compress/flate/deflate.go index f00da5b21..07265dded 100644 --- a/vendor/github.com/klauspost/compress/flate/deflate.go +++ b/vendor/github.com/klauspost/compress/flate/deflate.go @@ -374,6 +374,12 @@ func hash4(b []byte) uint32 { return hash4u(binary.LittleEndian.Uint32(b), hashBits) } +// hash4 returns the hash of u to fit in a hash table with h bits. +// Preferably h should be a constant and should always be <32. +func hash4u(u uint32, h uint8) uint32 { + return (u * prime4bytes) >> (32 - h) +} + // bulkHash4 will compute hashes using the same // algorithm as hash4 func bulkHash4(b []byte, dst []uint32) { |