private int decodePad()

in core/src/main/java/org/apache/james/mime4j/codec/Base64InputStream.java [257:292]

• 28 lines of code
• 6 McCabe index (conditional complexity)

    private int decodePad(int data, int sextets, final byte[] buffer,
            int index, final int end) throws IOException {
        eof = true;

        if (sextets == 2) {
            // one byte encoded as "XY=="

            byte b = (byte) (data >>> 4);
            if (index < end) {
                buffer[index++] = b;
            } else {
                decodedBuf.append(b);
            }
        } else if (sextets == 3) {
            // two bytes encoded as "XYZ="

            byte b1 = (byte) (data >>> 10);
            byte b2 = (byte) ((data >>> 2) & 0xFF);

            if (index < end - 1) {
                buffer[index++] = b1;
                buffer[index++] = b2;
            } else if (index < end) {
                buffer[index++] = b1;
                decodedBuf.append(b2);
            } else {
                decodedBuf.append(b1);
                decodedBuf.append(b2);
            }
        } else {
            // error in encoded data
            handleUnexpecedPad(sextets);
        }

        return index;
    }