Method terminateBits

src/core/qrcode/encoder/Encoder.ts:310–335

* Terminate bits as described in 8.4.8 and 8.4.9 of JISX0510:2004 (p.24).

(numDataBytes: number /*int*/, bits: BitArray)

     * Terminate bits as described in 8.4.8 and 8.4.9 of JISX0510:2004 (p.24).
     */
    public static terminateBits(numDataBytes: number /*int*/, bits: BitArray): void /*throws WriterException*/ {
        const capacity = numDataBytes * 8;
        if (bits.getSize() > capacity) {
            throw new WriterException('data bits cannot fit in the QR Code' + bits.getSize() + ' > ' +
                capacity);
        }
        for (let i = 0; i < 4 && bits.getSize() < capacity; ++i) {
            bits.appendBit(false);
        }
        // Append termination bits. See 8.4.8 of JISX0510:2004 (p.24) for details.
        // If the last byte isn't 8-bit aligned, we'll add padding bits.
        const numBitsInLastByte = bits.getSize() & 0x07;
        if (numBitsInLastByte > 0) {
            for (let i = numBitsInLastByte; i < 8; i++) {
                bits.appendBit(false);
            }
        }
        // If we have more space, we'll fill the space with padding patterns defined in 8.4.9 (p.24).
        const numPaddingBytes = numDataBytes - bits.getSizeInBytes();
        for (let i = 0; i < numPaddingBytes; ++i) {
            bits.appendBits((i & 0x01) === 0 ? 0xEC : 0x11, 8);
        }
        if (bits.getSize() !== capacity) {
            throw new WriterException('Bits size does not equal capacity');
        }
    }

    /**
     * Get number of data bytes and number of error correction bytes for block id "blockID". Store