Thu, 31 Aug 2017 15:18:52 +0800
merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. Oracle designates this |
aoqi@0 | 8 | * particular file as subject to the "Classpath" exception as provided |
aoqi@0 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
aoqi@0 | 10 | * |
aoqi@0 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 15 | * accompanied this code). |
aoqi@0 | 16 | * |
aoqi@0 | 17 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 20 | * |
aoqi@0 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 22 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 23 | * questions. |
aoqi@0 | 24 | */ |
aoqi@0 | 25 | |
aoqi@0 | 26 | package com.sun.xml.internal.org.jvnet.staxex; |
aoqi@0 | 27 | |
aoqi@0 | 28 | import java.io.*; |
aoqi@0 | 29 | import java.util.logging.Level; |
aoqi@0 | 30 | import java.util.logging.Logger; |
aoqi@0 | 31 | import javax.xml.stream.XMLStreamException; |
aoqi@0 | 32 | import javax.xml.stream.XMLStreamWriter; |
aoqi@0 | 33 | |
aoqi@0 | 34 | // for testing method |
aoqi@0 | 35 | //import com.sun.xml.internal.stream.writers.XMLStreamWriterImpl; |
aoqi@0 | 36 | |
aoqi@0 | 37 | /** |
aoqi@0 | 38 | * This class implements a BASE64 Encoder. It is implemented as |
aoqi@0 | 39 | * a FilterOutputStream, so one can just wrap this class around |
aoqi@0 | 40 | * any output stream and write bytes into this filter. The Encoding |
aoqi@0 | 41 | * is done as the bytes are written out. |
aoqi@0 | 42 | * |
aoqi@0 | 43 | * @author John Mani |
aoqi@0 | 44 | * @author Bill Shannon |
aoqi@0 | 45 | * @author Martin Grebac |
aoqi@0 | 46 | */ |
aoqi@0 | 47 | |
aoqi@0 | 48 | public class Base64EncoderStream extends FilterOutputStream { |
aoqi@0 | 49 | private byte[] buffer; // cache of bytes that are yet to be encoded |
aoqi@0 | 50 | private int bufsize = 0; // size of the cache |
aoqi@0 | 51 | |
aoqi@0 | 52 | private XMLStreamWriter outWriter; |
aoqi@0 | 53 | |
aoqi@0 | 54 | public Base64EncoderStream(OutputStream out) { |
aoqi@0 | 55 | super(out); |
aoqi@0 | 56 | buffer = new byte[3]; |
aoqi@0 | 57 | } |
aoqi@0 | 58 | |
aoqi@0 | 59 | /** |
aoqi@0 | 60 | * Create a BASE64 encoder that encodes the specified input stream |
aoqi@0 | 61 | */ |
aoqi@0 | 62 | public Base64EncoderStream(XMLStreamWriter outWriter, OutputStream out) { |
aoqi@0 | 63 | super(out); |
aoqi@0 | 64 | buffer = new byte[3]; |
aoqi@0 | 65 | this.outWriter = outWriter; |
aoqi@0 | 66 | } |
aoqi@0 | 67 | |
aoqi@0 | 68 | /** |
aoqi@0 | 69 | * Encodes <code>len</code> bytes from the specified |
aoqi@0 | 70 | * <code>byte</code> array starting at offset <code>off</code> to |
aoqi@0 | 71 | * this output stream. |
aoqi@0 | 72 | * |
aoqi@0 | 73 | * @param b the data. |
aoqi@0 | 74 | * @param off the start offset in the data. |
aoqi@0 | 75 | * @param len the number of bytes to write. |
aoqi@0 | 76 | * @exception IOException if an I/O error occurs. |
aoqi@0 | 77 | */ |
aoqi@0 | 78 | @Override |
aoqi@0 | 79 | public void write(byte[] b, int off, int len) throws IOException { |
aoqi@0 | 80 | for (int i = 0; i < len; i++) |
aoqi@0 | 81 | write(b[off + i]); |
aoqi@0 | 82 | } |
aoqi@0 | 83 | |
aoqi@0 | 84 | /** |
aoqi@0 | 85 | * Encodes <code>b.length</code> bytes to this output stream. |
aoqi@0 | 86 | * @param b the data to be written. |
aoqi@0 | 87 | * @exception IOException if an I/O error occurs. |
aoqi@0 | 88 | */ |
aoqi@0 | 89 | @Override |
aoqi@0 | 90 | public void write(byte[] b) throws IOException { |
aoqi@0 | 91 | write(b, 0, b.length); |
aoqi@0 | 92 | } |
aoqi@0 | 93 | |
aoqi@0 | 94 | /** |
aoqi@0 | 95 | * Encodes the specified <code>byte</code> to this output stream. |
aoqi@0 | 96 | * @param c the <code>byte</code>. |
aoqi@0 | 97 | * @exception IOException if an I/O error occurs. |
aoqi@0 | 98 | */ |
aoqi@0 | 99 | @Override |
aoqi@0 | 100 | public void write(int c) throws IOException { |
aoqi@0 | 101 | buffer[bufsize++] = (byte)c; |
aoqi@0 | 102 | if (bufsize == 3) { // Encoding unit = 3 bytes |
aoqi@0 | 103 | encode(); |
aoqi@0 | 104 | bufsize = 0; |
aoqi@0 | 105 | } |
aoqi@0 | 106 | } |
aoqi@0 | 107 | |
aoqi@0 | 108 | /** |
aoqi@0 | 109 | * Flushes this output stream and forces any buffered output bytes |
aoqi@0 | 110 | * to be encoded out to the stream. |
aoqi@0 | 111 | * @exception IOException if an I/O error occurs. |
aoqi@0 | 112 | */ |
aoqi@0 | 113 | @Override |
aoqi@0 | 114 | public void flush() throws IOException { |
aoqi@0 | 115 | if (bufsize > 0) { // If there's unencoded characters in the buffer .. |
aoqi@0 | 116 | encode(); // .. encode them |
aoqi@0 | 117 | bufsize = 0; |
aoqi@0 | 118 | } |
aoqi@0 | 119 | out.flush(); |
aoqi@0 | 120 | try { |
aoqi@0 | 121 | outWriter.flush(); |
aoqi@0 | 122 | } catch (XMLStreamException ex) { |
aoqi@0 | 123 | Logger.getLogger(Base64EncoderStream.class.getName()).log(Level.SEVERE, null, ex); |
aoqi@0 | 124 | throw new IOException(ex); |
aoqi@0 | 125 | } |
aoqi@0 | 126 | } |
aoqi@0 | 127 | |
aoqi@0 | 128 | /** |
aoqi@0 | 129 | * Forces any buffered output bytes to be encoded out to the stream |
aoqi@0 | 130 | * and closes this output stream |
aoqi@0 | 131 | */ |
aoqi@0 | 132 | @Override |
aoqi@0 | 133 | public void close() throws IOException { |
aoqi@0 | 134 | flush(); |
aoqi@0 | 135 | out.close(); |
aoqi@0 | 136 | } |
aoqi@0 | 137 | |
aoqi@0 | 138 | /** This array maps the characters to their 6 bit values */ |
aoqi@0 | 139 | private final static char pem_array[] = { |
aoqi@0 | 140 | 'A','B','C','D','E','F','G','H', // 0 |
aoqi@0 | 141 | 'I','J','K','L','M','N','O','P', // 1 |
aoqi@0 | 142 | 'Q','R','S','T','U','V','W','X', // 2 |
aoqi@0 | 143 | 'Y','Z','a','b','c','d','e','f', // 3 |
aoqi@0 | 144 | 'g','h','i','j','k','l','m','n', // 4 |
aoqi@0 | 145 | 'o','p','q','r','s','t','u','v', // 5 |
aoqi@0 | 146 | 'w','x','y','z','0','1','2','3', // 6 |
aoqi@0 | 147 | '4','5','6','7','8','9','+','/' // 7 |
aoqi@0 | 148 | }; |
aoqi@0 | 149 | |
aoqi@0 | 150 | private void encode() throws IOException { |
aoqi@0 | 151 | byte a, b, c; |
aoqi@0 | 152 | char[] buf = new char[4]; |
aoqi@0 | 153 | if (bufsize == 1) { |
aoqi@0 | 154 | a = buffer[0]; |
aoqi@0 | 155 | b = 0; |
aoqi@0 | 156 | c = 0; |
aoqi@0 | 157 | buf[0] = pem_array[(a >>> 2) & 0x3F]; |
aoqi@0 | 158 | buf[1] = pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]; |
aoqi@0 | 159 | buf[2] = '='; // pad character |
aoqi@0 | 160 | buf[3] = '='; // pad character |
aoqi@0 | 161 | } else if (bufsize == 2) { |
aoqi@0 | 162 | a = buffer[0]; |
aoqi@0 | 163 | b = buffer[1]; |
aoqi@0 | 164 | c = 0; |
aoqi@0 | 165 | buf[0] = pem_array[(a >>> 2) & 0x3F]; |
aoqi@0 | 166 | buf[1] = pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]; |
aoqi@0 | 167 | buf[2] = pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]; |
aoqi@0 | 168 | buf[3] = '='; // pad character |
aoqi@0 | 169 | } else { |
aoqi@0 | 170 | a = buffer[0]; |
aoqi@0 | 171 | b = buffer[1]; |
aoqi@0 | 172 | c = buffer[2]; |
aoqi@0 | 173 | buf[0] = pem_array[(a >>> 2) & 0x3F]; |
aoqi@0 | 174 | buf[1] = pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]; |
aoqi@0 | 175 | buf[2] = pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]; |
aoqi@0 | 176 | buf[3] = pem_array[c & 0x3F]; |
aoqi@0 | 177 | } |
aoqi@0 | 178 | try { |
aoqi@0 | 179 | outWriter.writeCharacters(buf, 0, 4); |
aoqi@0 | 180 | } catch (XMLStreamException ex) { |
aoqi@0 | 181 | Logger.getLogger(Base64EncoderStream.class.getName()).log(Level.SEVERE, null, ex); |
aoqi@0 | 182 | throw new IOException(ex); |
aoqi@0 | 183 | } |
aoqi@0 | 184 | } |
aoqi@0 | 185 | |
aoqi@0 | 186 | // public static void main(String argv[]) throws Exception { |
aoqi@0 | 187 | // FileInputStream infile = new FileInputStream(new File(argv[0])); |
aoqi@0 | 188 | // StringWriter sw = new StringWriter(); |
aoqi@0 | 189 | // XMLStreamWriterImpl wi = new XMLStreamWriterImpl(sw, null); |
aoqi@0 | 190 | // ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
aoqi@0 | 191 | // Base64EncoderStream encoder = new Base64EncoderStream(wi, baos); |
aoqi@0 | 192 | // int c; |
aoqi@0 | 193 | // |
aoqi@0 | 194 | // while ((c = infile.read()) != -1) |
aoqi@0 | 195 | // encoder.write(c); |
aoqi@0 | 196 | // encoder.close(); |
aoqi@0 | 197 | // |
aoqi@0 | 198 | // System.out.println("SW: " + sw.toString()); |
aoqi@0 | 199 | // System.out.println("BAOS: " + baos.toString()); |
aoqi@0 | 200 | // |
aoqi@0 | 201 | // } |
aoqi@0 | 202 | } |