uavstack-master/com.creditease.uav.helper/src/main/java/com/creditease/uav/helpers/url/BASE64DecoderUrl.java
/*-
 * <<
 * UAVStack
 * ==
 * Copyright (C) 2016 - 2017 UAVStack
 * ==
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * >>
 */
package com.creditease.uav.helpers.url;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PushbackInputStream;

// Referenced classes of package sun.misc:
// CharacterDecoder, CEFormatException, CEStreamExhausted

@SuppressWarnings("restriction")
public class BASE64DecoderUrl extends CharacterDecoderUrl {

    public BASE64DecoderUrl() {
        decode_buffer = new byte[4];
    }

    @Override
    protected int bytesPerAtom() {

        return 4;
    }

    @Override
    protected int bytesPerLine() {

        return 72;
    }

    @Override
    protected void decodeAtom(PushbackInputStream pushbackinputstream, OutputStream outputstream, int i)
            throws IOException {

        byte byte0 = -1;
        byte byte1 = -1;
        byte byte2 = -1;
        byte byte3 = -1;
        if (i < 2)
            throw new IOException("BASE64Decoder: Not enough bytes for an atom.");
        int j;
        do {
            j = pushbackinputstream.read();
            if (j == -1)
                throw new IOException();
        }
        while (j == 10 || j == 13);
        decode_buffer[0] = (byte) j;
        j = readFully(pushbackinputstream, decode_buffer, 1, i - 1);
        if (j == -1)
            throw new IOException();
        if (i > 3 && decode_buffer[3] == 61)
            i = 3;
        if (i > 2 && decode_buffer[2] == 61)
            i = 2;
        switch (i) {
            case 4: // '\004'
                byte3 = pem_convert_array[decode_buffer[3] & 255];
                // fall through

            case 3: // '\003'
                byte2 = pem_convert_array[decode_buffer[2] & 255];
                // fall through

            case 2: // '\002'
                byte1 = pem_convert_array[decode_buffer[1] & 255];
                byte0 = pem_convert_array[decode_buffer[0] & 255];
                // fall through

            default:
                switch (i) {
                    case 2: // '\002'
                        outputstream.write((byte) (byte0 << 2 & 252 | byte1 >>> 4 & 3));
                        break;

                    case 3: // '\003'
                        outputstream.write((byte) (byte0 << 2 & 252 | byte1 >>> 4 & 3));
                        outputstream.write((byte) (byte1 << 4 & 240 | byte2 >>> 2 & 15));
                        break;

                    case 4: // '\004'
                        outputstream.write((byte) (byte0 << 2 & 252 | byte1 >>> 4 & 3));
                        outputstream.write((byte) (byte1 << 4 & 240 | byte2 >>> 2 & 15));
                        outputstream.write((byte) (byte2 << 6 & 192 | byte3 & 63));
                        break;
                }
                break;
        }
    }

    private static final char pem_array[] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
            'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
            'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4',
            '5', '6', '7', '8', '9', '-', '_' };
    private static final byte pem_convert_array[];
    byte decode_buffer[];

    static {
        pem_convert_array = new byte[256];
        for (int i = 0; i < 255; i++)
            pem_convert_array[i] = -1;

        for (int j = 0; j < pem_array.length; j++)
            pem_convert_array[pem_array[j]] = (byte) j;

    }
}

/*
 * DECOMPILATION REPORT
 * 
 * Decompiled from: D:\UAVIDE\jdk7\jre\lib\rt.jar Total time: 18 ms Jad reported messages/errors: Exit status: 0 Caught
 * exceptions:
 */