Function appendStringLength

binlogreplication/binlog_json_serialization.go:308–327

appendStringLength appends a variable number of bytes to the specified |bytes| to encode |length|, the length of a string. For string lengths, if the length is larger than 127 bytes, we set the high bit of the first byte and use two bytes to encode the length. Similarly, if the high bit of the secon

(bytes []byte, length int)

// length of a string. For string lengths, if the length is larger than 127 bytes, we set the high bit of
// the first byte and use two bytes to encode the length. Similarly, if the high bit of the second byte is
// also set, the length is encoded over three bytes.
func appendStringLength(bytes []byte, length int) ([]byte, error) {
	switch {
	case length > 0x1FFFFF:
		return nil, fmt.Errorf("strings larger than 2,097,151 bytes not supported")

	case length > 0x3FFF: // 16,383
		return append(bytes,
			byte(length&0x7F|0x80),
			byte(length>>7|0x80),
			byte(length>>14)), nil

	case length > 0x7F: // 127
		return append(bytes,
			byte(length&0x7F|0x80),
			byte(length>>7)), nil

	default:
		return append(bytes, byte(length)), nil
	}
}

// calculateInitialArrayValuesOffset returns the initial offset value for the first array value in the