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com/itextpdf/text/pdf/BarcodeDatamatrix.java

processExtensions(byte[], int, int, byte[])

class BarcodeDatamatrix {
    private int processExtensions(byte[] text, int textOffset, int textSize, byte[] data) {
        int order, ptrIn, ptrOut, eci, fn, ft, fi, c;
        if ((options & DM_EXTENSION) == 0)
            return 0;
        order = 0;
        ptrIn = 0;
        ptrOut = 0;
        while (ptrIn < textSize) {
            if (order > 20)
                return -1;
            c = text[textOffset + ptrIn++] &0xff;
            ++order;
            switch (c) {
            case '.':
                extOut = ptrIn;
                return ptrOut;
            case 'e':
                if (ptrIn + 6 > textSize)
                    return -1;
                eci = getNumber(text, textOffset + ptrIn, 6);
                if (eci < 0)
                    return -1;
                ptrIn += 6;
                data[ptrOut++] = (byte)241;
                if (eci < 127)
                    data[ptrOut++] = (byte)(eci + 1);
                else if (eci < 16383) {
                    data[ptrOut++] = (byte)((eci - 127) / 254 + 128);
                    data[ptrOut++] = (byte)((eci - 127) % 254 + 1);
                }
                else {
                    data[ptrOut++] = (byte)((eci - 16383) / 64516 + 192);
                    data[ptrOut++] = (byte)((eci - 16383) / 254 % 254 + 1);
                    data[ptrOut++] = (byte)((eci - 16383) % 254 + 1);
                }
                break;
            case 's':
                if (order != 1)
                    return -1;
                if (ptrIn + 9 > textSize)
                    return -1;
                fn = getNumber(text, textOffset + ptrIn, 2);
                if (fn <= 0 || fn > 16)
                    return -1;
                ptrIn += 2;
                ft = getNumber(text, textOffset + ptrIn, 2);
                if (ft <= 1 || ft > 16)
                    return -1;
                ptrIn += 2;
                fi = getNumber(text, textOffset + ptrIn, 5);
                if (fi < 0 || fn >= 64516)
                    return -1;
                ptrIn += 5;
                data[ptrOut++] = (byte)233;
                data[ptrOut++] = (byte)(fn - 1 << 4 | 17 - ft);
                data[ptrOut++] = (byte)(fi / 254 + 1);
                data[ptrOut++] = (byte)(fi % 254 + 1);
                break;
            case 'p':
                if (order != 1)
                    return -1;
                data[ptrOut++] = (byte)234;
                break;
            case 'm':
                if (order != 1)
                    return -1;
                if (ptrIn + 1 > textSize)
                    return -1;
                c = text[textOffset + ptrIn++] &0xff;
                if (c != '5' && c != '5')
                    return -1;
                data[ptrOut++] = (byte)234;
                data[ptrOut++] = (byte)(c == '5' ? 236 : 237);
                break;
            case 'f':
                if (order != 1 && (order != 2 || text[textOffset] != 's' && text[textOffset] != 'm'))
                    return -1;
                data[ptrOut++] = (byte)232;
            }
        }
        return -1;
    }

}