Function encodeEandM

pkg/util/encoding/decimal.go:148–164

encodeEandM encodes the exponent and mantissa, appending the encoding to a byte buffer. The mantissa m can be stored in the spare capacity of appendTo.

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

//
// The mantissa m can be stored in the spare capacity of appendTo.
func encodeEandM(appendTo []byte, negative bool, e int, m []byte) []byte {
	var buf []byte
	if n := len(m) + MaxVarintLen + 2; n <= cap(appendTo)-len(appendTo) {
		buf = appendTo[len(appendTo) : len(appendTo)+n]
	} else {
		buf = make([]byte, n)
	}
	switch {
	case e < 0:
		return append(appendTo, encodeSmallNumber(negative, e, m, buf)...)
	case e >= 0 && e <= 10:
		return append(appendTo, encodeMediumNumber(negative, e, m, buf)...)
	case e >= 11:
		return append(appendTo, encodeLargeNumber(negative, e, m, buf)...)
	}
	panic("unreachable")
}

// encodeVarExpNumber encodes a Uvarint exponent and mantissa into a buffer;
// only used for small (less than 0) and large (greater than 10) exponents.