diff options
Diffstat (limited to 'vendor/github.com/klauspost/compress/huff0/decompress.go')
| -rw-r--r-- | vendor/github.com/klauspost/compress/huff0/decompress.go | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/vendor/github.com/klauspost/compress/huff0/decompress.go b/vendor/github.com/klauspost/compress/huff0/decompress.go index a03b2634a..41703bba4 100644 --- a/vendor/github.com/klauspost/compress/huff0/decompress.go +++ b/vendor/github.com/klauspost/compress/huff0/decompress.go @@ -32,7 +32,7 @@ const use8BitTables = true // The size of the input may be larger than the table definition. // Any content remaining after the table definition will be returned. // If no Scratch is provided a new one is allocated. -// The returned Scratch can be used for decoding input using this table. +// The returned Scratch can be used for encoding or decoding input using this table. func ReadTable(in []byte, s *Scratch) (s2 *Scratch, remain []byte, err error) { s, err = s.prepare(in) if err != nil { @@ -58,8 +58,8 @@ func ReadTable(in []byte, s *Scratch) (s2 *Scratch, remain []byte, err error) { s.symbolLen = uint16(oSize) in = in[iSize:] } else { - if len(in) <= int(iSize) { - return s, nil, errors.New("input too small for table") + if len(in) < int(iSize) { + return s, nil, fmt.Errorf("input too small for table, want %d bytes, have %d", iSize, len(in)) } // FSE compressed weights s.fse.DecompressLimit = 255 @@ -138,15 +138,33 @@ func ReadTable(in []byte, s *Scratch) (s2 *Scratch, remain []byte, err error) { if len(s.dt.single) != tSize { s.dt.single = make([]dEntrySingle, tSize) } + cTable := s.prevTable + if cap(cTable) < maxSymbolValue+1 { + cTable = make([]cTableEntry, 0, maxSymbolValue+1) + } + cTable = cTable[:maxSymbolValue+1] + s.prevTable = cTable[:s.symbolLen] + s.prevTableLog = s.actualTableLog + for n, w := range s.huffWeight[:s.symbolLen] { if w == 0 { + cTable[n] = cTableEntry{ + val: 0, + nBits: 0, + } continue } length := (uint32(1) << w) >> 1 d := dEntrySingle{ entry: uint16(s.actualTableLog+1-w) | (uint16(n) << 8), } + rank := &rankStats[w] + cTable[n] = cTableEntry{ + val: uint16(*rank >> (w - 1)), + nBits: uint8(d.entry), + } + single := s.dt.single[*rank : *rank+length] for i := range single { single[i] = d |