Function encodeMediumNumber

pkg/util/encoding/decimal.go:229–245

encodeMediumNumber encodes the exponent and mantissa into a buffer, only used when the exponent is in [0, 10]. The encoding must fit in encInto. The mantissa m can overlap with encInto. Returns the length-adjusted buffer.

(negative bool, e int, m []byte, encInto []byte)

//
// Returns the length-adjusted buffer.
func encodeMediumNumber(negative bool, e int, m []byte, encInto []byte) []byte {
	l := 1 + len(m)
	if len(encInto) < l+1 {
		panic("buffer too short")
	}
	// Because m can overlap with encInto, we must first copy m to the right place
	// before modifying encInto.
	copy(encInto[1:], m)
	if negative {
		encInto[0] = decimalNegMedium - byte(e)
		onesComplement(encInto[1:l])
	} else {
		encInto[0] = decimalPosMedium + byte(e)
	}
	encInto[l] = decimalTerminator
	return encInto[:l+1]
}

// DecodeDecimalAscending returns the remaining byte slice after decoding and the decoded
// decimal from buf.