001    /*
002     * Copyright (c) Andrey Kuznetsov. All Rights Reserved.
003     *
004     * http://res.imagero.com
005     *
006     * Redistribution and use in source and binary forms, with or without
007     * modification, are permitted provided that the following conditions are met:
008     *
009     *  o Redistributions of source code must retain the above copyright notice,
010     *    this list of conditions and the following disclaimer.
011     *
012     *  o Redistributions in binary form must reproduce the above copyright notice,
013     *    this list of conditions and the following disclaimer in the documentation
014     *    and/or other materials provided with the distribution.
015     *
016     *  o Neither the name of Andrey Kuznetsov nor the names of
017     *    its contributors may be used to endorse or promote products derived
018     *    from this software without specific prior written permission.
019     *
020     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
021     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
022     * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
023     * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
024     * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
025     * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
026     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
027     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
028     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
029     * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
030     * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
031     */
032    
033    package com.imagero.uio.io;
034    
035    import java.io.IOException;
036    import java.io.InputStream;
037    
038    /**
039     * InputStream for decoding data from base64 encoded String array
040     * @author Andrey Kuznetsov
041     */
042    public class Base64DInputStream extends InputStream {
043    
044        boolean finished;
045    
046        protected byte[] buffer;
047        String[] s;
048    
049        int current;
050    
051        int p;
052    
053        public Base64DInputStream(String[] s) {
054            this.s = s;
055        }
056    
057        /**
058         * decode next byte
059         * @return int
060         * @throws IOException
061         */
062        public int read() throws IOException {
063            if (finished) {
064                return -1;
065            }
066            if (buffer == null || p >= buffer.length) {
067                next();
068            }
069            if (buffer == null) {
070                finished = true;
071                return -1;
072            }
073            try {
074                return buffer[p++] & 0xFF;
075            }
076            catch (ArrayIndexOutOfBoundsException ex) {
077                System.err.println(p + " " + buffer.length);
078                throw ex;
079            }
080        }
081    
082        /**
083         * switch to next String
084         */
085        protected void next() throws IOException {
086            if (finished) {
087                buffer = null;
088                p = 0;
089                return;
090            }
091            if (current < s.length) {
092                String s = this.s[current++];
093                buffer = Base64.base64Decode(s);
094                p = 0;
095            }
096            else {
097                finished = true;
098                buffer = null;
099                p = 0;
100            }
101        }
102    }