Method getEncodedData

src/core/aztec/decoder/Decoder.ts:97–154

* Gets the string encoded in the aztec code bits * * @return the decoded string

(correctedBits: boolean[])

     * @return the decoded string
     */
    private static getEncodedData(correctedBits: boolean[]): string {
        let endIndex: number = correctedBits.length;
        let latchTable = Table.UPPER; // table most recently latched to
        let shiftTable = Table.UPPER; // table to use for the next read
        let result: string = '';
        let index = 0;
        while (index < endIndex) {
            if (shiftTable === Table.BINARY) {
                if (endIndex - index < 5) {
                    break;
                }
                let length = Decoder.readCode(correctedBits, index, 5);
                index += 5;
                if (length === 0) {
                    if (endIndex - index < 11) {
                        break;
                    }
                    length = Decoder.readCode(correctedBits, index, 11) + 31;
                    index += 11;
                }
                for (let charCount = 0; charCount < length; charCount++) {
                    if (endIndex - index < 8) {
                        index = endIndex;  // Force outer loop to exit
                        break;
                    }
                    const code: int = Decoder.readCode(correctedBits, index, 8);
                    result += /*(char)*/ StringUtils.castAsNonUtf8Char(code);
                    index += 8;
                }
                // Go back to whatever mode we had been in
                shiftTable = latchTable;
            } else {
                let size = shiftTable === Table.DIGIT ? 4 : 5;
                if (endIndex - index < size) {
                    break;
                }
                let code = Decoder.readCode(correctedBits, index, size);
                index += size;
                let str = Decoder.getCharacter(shiftTable, code);
                if (str.startsWith('CTRL_')) {
                    // Table changes
                    // ISO/IEC 24778:2008 prescribes ending a shift sequence in the mode from which it was invoked.
                    // That's including when that mode is a shift.
                    // Our test case dlusbs.png for issue #642 exercises that.
                    latchTable = shiftTable;  // Latch the current mode, so as to return to Upper after U/S B/S
                    shiftTable = Decoder.getTable(str.charAt(5));
                    if (str.charAt(6) === 'L') {
                        latchTable = shiftTable;
                    }
                } else {
                    result += str;
                    // Go back to whatever mode we had been in
                    shiftTable = latchTable;
                }
            }
        }
        return result;
    }