func marshalVarint()

in marshal.go [772:823]

• 46 lines of code
• 15 McCabe index (conditional complexity)

func marshalVarint(info TypeInfo, value interface{}) ([]byte, error) {
	var (
		retBytes []byte
		err      error
	)

	switch v := value.(type) {
	case unsetColumn:
		return nil, nil
	case uint64:
		if v > uint64(math.MaxInt64) {
			retBytes = make([]byte, 9)
			binary.BigEndian.PutUint64(retBytes[1:], v)
		} else {
			retBytes = make([]byte, 8)
			binary.BigEndian.PutUint64(retBytes, v)
		}
	case big.Int:
		retBytes = encBigInt2C(&v)
	default:
		retBytes, err = marshalBigInt(info, value)
	}

	if err == nil {
		// trim down to most significant byte
		i := 0
		for ; i < len(retBytes)-1; i++ {
			b0 := retBytes[i]
			if b0 != 0 && b0 != 0xFF {
				break
			}

			b1 := retBytes[i+1]
			if b0 == 0 && b1 != 0 {
				if b1&0x80 == 0 {
					i++
				}
				break
			}

			if b0 == 0xFF && b1 != 0xFF {
				if b1&0x80 > 0 {
					i++
				}
				break
			}
		}
		retBytes = retBytes[i:]
	}

	return retBytes, err
}