diff options
Diffstat (limited to 'libgo/go/compress/flate/deflate.go')
| -rw-r--r-- | libgo/go/compress/flate/deflate.go | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libgo/go/compress/flate/deflate.go b/libgo/go/compress/flate/deflate.go index 2040840..e511b50 100644 --- a/libgo/go/compress/flate/deflate.go +++ b/libgo/go/compress/flate/deflate.go @@ -32,6 +32,7 @@ const ( hashSize = 1 << hashBits hashMask = (1 << hashBits) - 1 hashShift = (hashBits + minMatchLength - 1) / minMatchLength + maxHashOffset = 1 << 24 skipNever = math.MaxInt32 ) @@ -106,6 +107,25 @@ func (d *compressor) fillDeflate(b []byte) int { d.blockStart = math.MaxInt32 } d.hashOffset += windowSize + if d.hashOffset > maxHashOffset { + delta := d.hashOffset - 1 + d.hashOffset -= delta + d.chainHead -= delta + for i, v := range d.hashPrev { + if v > delta { + d.hashPrev[i] -= delta + } else { + d.hashPrev[i] = 0 + } + } + for i, v := range d.hashHead { + if v > delta { + d.hashHead[i] -= delta + } else { + d.hashHead[i] = 0 + } + } + } } n := copy(d.window[d.windowEnd:], b) d.windowEnd += n |