diff options
Diffstat (limited to 'vendor/github.com/klauspost/compress/fse')
| -rw-r--r-- | vendor/github.com/klauspost/compress/fse/compress.go | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/vendor/github.com/klauspost/compress/fse/compress.go b/vendor/github.com/klauspost/compress/fse/compress.go index 6f341914..dac97e58 100644 --- a/vendor/github.com/klauspost/compress/fse/compress.go +++ b/vendor/github.com/klauspost/compress/fse/compress.go @@ -146,54 +146,51 @@ func (s *Scratch) compress(src []byte) error { c1.encodeZero(tt[src[ip-2]]) ip -= 2 } + src = src[:ip] // Main compression loop. switch { case !s.zeroBits && s.actualTableLog <= 8: // We can encode 4 symbols without requiring a flush. // We do not need to check if any output is 0 bits. - for ip >= 4 { + for ; len(src) >= 4; src = src[:len(src)-4] { s.bw.flush32() - v3, v2, v1, v0 := src[ip-4], src[ip-3], src[ip-2], src[ip-1] + v3, v2, v1, v0 := src[len(src)-4], src[len(src)-3], src[len(src)-2], src[len(src)-1] c2.encode(tt[v0]) c1.encode(tt[v1]) c2.encode(tt[v2]) c1.encode(tt[v3]) - ip -= 4 } case !s.zeroBits: // We do not need to check if any output is 0 bits. - for ip >= 4 { + for ; len(src) >= 4; src = src[:len(src)-4] { s.bw.flush32() - v3, v2, v1, v0 := src[ip-4], src[ip-3], src[ip-2], src[ip-1] + v3, v2, v1, v0 := src[len(src)-4], src[len(src)-3], src[len(src)-2], src[len(src)-1] c2.encode(tt[v0]) c1.encode(tt[v1]) s.bw.flush32() c2.encode(tt[v2]) c1.encode(tt[v3]) - ip -= 4 } case s.actualTableLog <= 8: // We can encode 4 symbols without requiring a flush - for ip >= 4 { + for ; len(src) >= 4; src = src[:len(src)-4] { s.bw.flush32() - v3, v2, v1, v0 := src[ip-4], src[ip-3], src[ip-2], src[ip-1] + v3, v2, v1, v0 := src[len(src)-4], src[len(src)-3], src[len(src)-2], src[len(src)-1] c2.encodeZero(tt[v0]) c1.encodeZero(tt[v1]) c2.encodeZero(tt[v2]) c1.encodeZero(tt[v3]) - ip -= 4 } default: - for ip >= 4 { + for ; len(src) >= 4; src = src[:len(src)-4] { s.bw.flush32() - v3, v2, v1, v0 := src[ip-4], src[ip-3], src[ip-2], src[ip-1] + v3, v2, v1, v0 := src[len(src)-4], src[len(src)-3], src[len(src)-2], src[len(src)-1] c2.encodeZero(tt[v0]) c1.encodeZero(tt[v1]) s.bw.flush32() c2.encodeZero(tt[v2]) c1.encodeZero(tt[v3]) - ip -= 4 } } @@ -459,15 +456,17 @@ func (s *Scratch) countSimple(in []byte) (max int) { for _, v := range in { s.count[v]++ } - m := uint32(0) + m, symlen := uint32(0), s.symbolLen for i, v := range s.count[:] { + if v == 0 { + continue + } if v > m { m = v } - if v > 0 { - s.symbolLen = uint16(i) + 1 - } + symlen = uint16(i) + 1 } + s.symbolLen = symlen return int(m) } |