// ReadCheckSums reads the values back.
func (c *Checksum) AppendTo(b []byte, parts []byte) []byte {
	if c == nil {
		return nil
	}
	var tmp [binary.MaxVarintLen32]byte
	n := binary.PutUvarint(tmp[:], uint64(c.Type))
	crc := c.Raw
	if c.Type.Trailing() {
		// When we serialize we don't care if it was trailing.
		c.Type ^= ChecksumTrailing
	}
	if len(crc) != c.Type.RawByteLen() {
		return b
	}

pkg encoding/binary, const MaxVarintLen16 ideal-int
pkg encoding/binary, const MaxVarintLen32 ideal-int
pkg encoding/binary, const MaxVarintLen64 ideal-int
pkg encoding/binary, func PutUvarint([]uint8, uint64) int
pkg encoding/binary, func PutVarint([]uint8, int64) int
pkg encoding/binary, func Read(io.Reader, ByteOrder, interface{}) error
pkg encoding/binary, func ReadUvarint(io.ByteReader) (uint64, error)