Method encodeDataRaw

encoder.go:322–370

encodeDataRaw encodes data in dataMode. The encoded data is appended to encoded.

(data []byte, dataMode dataMode, encoded *bitset.Bitset)

// encodeDataRaw encodes data in dataMode. The encoded data is appended to
// encoded.
func (d *dataEncoder) encodeDataRaw(data []byte, dataMode dataMode, encoded *bitset.Bitset) {
	modeIndicator := d.modeIndicator(dataMode)
	charCountBits := d.charCountBits(dataMode)

	// Append mode indicator.
	encoded.Append(modeIndicator)

	// Append character count.
	encoded.AppendUint32(uint32(len(data)), charCountBits)

	// Append data.
	switch dataMode {
	case dataModeNumeric:
		for i := 0; i < len(data); i += 3 {
			charsRemaining := len(data) - i

			var value uint32
			bitsUsed := 1

			for j := 0; j < charsRemaining && j < 3; j++ {
				value *= 10
				value += uint32(data[i+j] - 0x30)
				bitsUsed += 3
			}
			encoded.AppendUint32(value, bitsUsed)
		}
	case dataModeAlphanumeric:
		for i := 0; i < len(data); i += 2 {
			charsRemaining := len(data) - i

			var value uint32
			for j := 0; j < charsRemaining && j < 2; j++ {
				value *= 45
				value += encodeAlphanumericCharacter(data[i+j])
			}

			bitsUsed := 6
			if charsRemaining > 1 {
				bitsUsed = 11
			}

			encoded.AppendUint32(value, bitsUsed)
		}
	case dataModeByte:
		for _, b := range data {
			encoded.AppendByte(b, 8)
		}
	}
}

// modeIndicator returns the segment header bits for a segment of type dataMode.
func (d *dataEncoder) modeIndicator(dataMode dataMode) *bitset.Bitset {