Function decodeDecimal

pkg/util/encoding/decimal.go:258–323

(buf []byte, tmp []byte, invert bool)

}

func decodeDecimal(buf []byte, tmp []byte, invert bool) ([]byte, apd.Decimal, error) {
	// Handle the simplistic cases first.
	switch buf[0] {
	case decimalNaN, decimalNaNDesc:
		return buf[1:], apd.Decimal{Form: apd.NaN}, nil
	case decimalInfinity:
		return buf[1:], apd.Decimal{Form: apd.Infinite, Negative: invert}, nil
	case decimalNegativeInfinity:
		return buf[1:], apd.Decimal{Form: apd.Infinite, Negative: !invert}, nil
	case decimalZero:
		return buf[1:], apd.Decimal{}, nil
	}
	tmp = tmp[len(tmp):cap(tmp)]
	switch {
	case buf[0] == decimalNegLarge:
		// Negative large.
		e, m, r, tmp2, err := decodeLargeNumber(true, buf, tmp)
		if err != nil {
			return nil, apd.Decimal{}, err
		}
		d, err := makeDecimalFromMandE(!invert, e, m, tmp2)
		return r, d, err
	case buf[0] > decimalNegLarge && buf[0] <= decimalNegMedium:
		// Negative medium.
		e, m, r, tmp2, err := decodeMediumNumber(true, buf, tmp)
		if err != nil {
			return nil, apd.Decimal{}, err
		}
		d, err := makeDecimalFromMandE(!invert, e, m, tmp2)
		return r, d, err
	case buf[0] == decimalNegSmall:
		// Negative small.
		e, m, r, tmp2, err := decodeSmallNumber(true, buf, tmp)
		if err != nil {
			return nil, apd.Decimal{}, err
		}
		d, err := makeDecimalFromMandE(!invert, e, m, tmp2)
		return r, d, err
	case buf[0] == decimalPosLarge:
		// Positive large.
		e, m, r, tmp2, err := decodeLargeNumber(false, buf, tmp)
		if err != nil {
			return nil, apd.Decimal{}, err
		}
		d, err := makeDecimalFromMandE(invert, e, m, tmp2)
		return r, d, err
	case buf[0] >= decimalPosMedium && buf[0] < decimalPosLarge:
		// Positive medium.
		e, m, r, tmp2, err := decodeMediumNumber(false, buf, tmp)
		if err != nil {
			return nil, apd.Decimal{}, err
		}
		d, err := makeDecimalFromMandE(invert, e, m, tmp2)
		return r, d, err
	case buf[0] == decimalPosSmall:
		// Positive small.
		e, m, r, tmp2, err := decodeSmallNumber(false, buf, tmp)
		if err != nil {