diff options
Diffstat (limited to 'vendor/github.com/klauspost/compress/huff0/decompress.go')
| -rw-r--r-- | vendor/github.com/klauspost/compress/huff0/decompress.go | 63 |
1 files changed, 38 insertions, 25 deletions
diff --git a/vendor/github.com/klauspost/compress/huff0/decompress.go b/vendor/github.com/klauspost/compress/huff0/decompress.go index 2668b64d3..3ae7d4677 100644 --- a/vendor/github.com/klauspost/compress/huff0/decompress.go +++ b/vendor/github.com/klauspost/compress/huff0/decompress.go @@ -741,6 +741,7 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) { } var br [4]bitReaderShifted + // Decode "jump table" start := 6 for i := 0; i < 3; i++ { length := int(src[i*2]) | (int(src[i*2+1]) << 8) @@ -865,30 +866,18 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) { } // Decode remaining. + remainBytes := dstEvery - (decoded / 4) for i := range br { offset := dstEvery * i + endsAt := offset + remainBytes + if endsAt > len(out) { + endsAt = len(out) + } br := &br[i] - bitsLeft := br.off*8 + uint(64-br.bitsRead) + bitsLeft := br.remaining() for bitsLeft > 0 { br.fill() - if false && br.bitsRead >= 32 { - if br.off >= 4 { - v := br.in[br.off-4:] - v = v[:4] - low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24) - br.value = (br.value << 32) | uint64(low) - br.bitsRead -= 32 - br.off -= 4 - } else { - for br.off > 0 { - br.value = (br.value << 8) | uint64(br.in[br.off-1]) - br.bitsRead -= 8 - br.off-- - } - } - } - // end inline... - if offset >= len(out) { + if offset >= endsAt { d.bufs.Put(buf) return nil, errors.New("corruption detected: stream overrun 4") } @@ -902,6 +891,10 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) { out[offset] = uint8(v >> 8) offset++ } + if offset != endsAt { + d.bufs.Put(buf) + return nil, fmt.Errorf("corruption detected: short output block %d, end %d != %d", i, offset, endsAt) + } decoded += offset - dstEvery*i err = br.close() if err != nil { @@ -1091,10 +1084,16 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) { } // Decode remaining. + // Decode remaining. + remainBytes := dstEvery - (decoded / 4) for i := range br { offset := dstEvery * i + endsAt := offset + remainBytes + if endsAt > len(out) { + endsAt = len(out) + } br := &br[i] - bitsLeft := int(br.off*8) + int(64-br.bitsRead) + bitsLeft := br.remaining() for bitsLeft > 0 { if br.finished() { d.bufs.Put(buf) @@ -1117,7 +1116,7 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) { } } // end inline... - if offset >= len(out) { + if offset >= endsAt { d.bufs.Put(buf) return nil, errors.New("corruption detected: stream overrun 4") } @@ -1126,10 +1125,14 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) { v := single[uint8(br.value>>shift)].entry nBits := uint8(v) br.advance(nBits) - bitsLeft -= int(nBits) + bitsLeft -= uint(nBits) out[offset] = uint8(v >> 8) offset++ } + if offset != endsAt { + d.bufs.Put(buf) + return nil, fmt.Errorf("corruption detected: short output block %d, end %d != %d", i, offset, endsAt) + } decoded += offset - dstEvery*i err = br.close() if err != nil { @@ -1315,10 +1318,15 @@ func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) { } // Decode remaining. + remainBytes := dstEvery - (decoded / 4) for i := range br { offset := dstEvery * i + endsAt := offset + remainBytes + if endsAt > len(out) { + endsAt = len(out) + } br := &br[i] - bitsLeft := int(br.off*8) + int(64-br.bitsRead) + bitsLeft := br.remaining() for bitsLeft > 0 { if br.finished() { d.bufs.Put(buf) @@ -1341,7 +1349,7 @@ func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) { } } // end inline... - if offset >= len(out) { + if offset >= endsAt { d.bufs.Put(buf) return nil, errors.New("corruption detected: stream overrun 4") } @@ -1350,10 +1358,15 @@ func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) { v := single[br.peekByteFast()].entry nBits := uint8(v) br.advance(nBits) - bitsLeft -= int(nBits) + bitsLeft -= uint(nBits) out[offset] = uint8(v >> 8) offset++ } + if offset != endsAt { + d.bufs.Put(buf) + return nil, fmt.Errorf("corruption detected: short output block %d, end %d != %d", i, offset, endsAt) + } + decoded += offset - dstEvery*i err = br.close() if err != nil { |