Method prepare

huff0/huff0.go:134–176

(in []byte)

}

func (s *Scratch) prepare(in []byte) (*Scratch, error) {
	if len(in) > BlockSizeMax {
		return nil, ErrTooBig
	}
	if s == nil {
		s = &Scratch{}
	}
	if s.MaxSymbolValue == 0 {
		s.MaxSymbolValue = maxSymbolValue
	}
	if s.TableLog == 0 {
		s.TableLog = tableLogDefault
	}
	if s.TableLog > tableLogMax || s.TableLog < minTablelog {
		return nil, fmt.Errorf(" invalid tableLog %d (%d -> %d)", s.TableLog, minTablelog, tableLogMax)
	}
	if s.MaxDecodedSize <= 0 || s.MaxDecodedSize > BlockSizeMax {
		s.MaxDecodedSize = BlockSizeMax
	}
	if s.clearCount && s.maxCount == 0 {
		for i := range s.count {
			s.count[i] = 0
		}
		s.clearCount = false
	}
	if cap(s.Out) == 0 {
		s.Out = make([]byte, 0, len(in))
	}
	s.Out = s.Out[:0]

	s.OutTable = nil
	s.OutData = nil
	if cap(s.nodes) < huffNodesLen+1 {
		s.nodes = make([]nodeElt, 0, huffNodesLen+1)
	}
	s.nodes = s.nodes[:0]
	if s.fse == nil {
		s.fse = &fse.Scratch{}
	}
	s.srcLen = len(in)

	return s, nil
}

type cTable []cTableEntry