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| 1 | +/* | |
| 2 | + * Copyright (c) 1995, 1997, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +package sun.misc; | |
| 26 | + | |
| 27 | +import java.io.OutputStream; | |
| 28 | +import java.io.InputStream; | |
| 29 | +import java.io.PrintStream; | |
| 30 | +import java.io.IOException; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * This class implements a BASE64 Character encoder as specified in RFC1521. | |
| 34 | + * This RFC is part of the MIME specification as published by the Internet | |
| 35 | + * Engineering Task Force (IETF). Unlike some other encoding schemes there | |
| 36 | + * is nothing in this encoding that indicates | |
| 37 | + * where a buffer starts or ends. | |
| 38 | + * | |
| 39 | + * This means that the encoded text will simply start with the first line | |
| 40 | + * of encoded text and end with the last line of encoded text. | |
| 41 | + * | |
| 42 | + * @author Chuck McManis | |
| 43 | + * @see CharacterEncoder | |
| 44 | + * @see BASE64Decoder | |
| 45 | + */ | |
| 46 | + | |
| 47 | +public class BASE64Encoder extends CharacterEncoder { | |
| 48 | + | |
| 49 | + /** this class encodes three bytes per atom. */ | |
| 50 | + protected int bytesPerAtom() { | |
| 51 | + return (3); | |
| 52 | + } | |
| 53 | + | |
| 54 | + /** | |
| 55 | + * this class encodes 57 bytes per line. This results in a maximum | |
| 56 | + * of 57/3 * 4 or 76 characters per output line. Not counting the | |
| 57 | + * line termination. | |
| 58 | + */ | |
| 59 | + protected int bytesPerLine() { | |
| 60 | + return (57); | |
| 61 | + } | |
| 62 | + | |
| 63 | + /** This array maps the characters to their 6 bit values */ | |
| 64 | + private final static char pem_array[] = { | |
| 65 | + // 0 1 2 3 4 5 6 7 | |
| 66 | + 'A','B','C','D','E','F','G','H', // 0 | |
| 67 | + 'I','J','K','L','M','N','O','P', // 1 | |
| 68 | + 'Q','R','S','T','U','V','W','X', // 2 | |
| 69 | + 'Y','Z','a','b','c','d','e','f', // 3 | |
| 70 | + 'g','h','i','j','k','l','m','n', // 4 | |
| 71 | + 'o','p','q','r','s','t','u','v', // 5 | |
| 72 | + 'w','x','y','z','0','1','2','3', // 6 | |
| 73 | + '4','5','6','7','8','9','+','/' // 7 | |
| 74 | + }; | |
| 75 | + | |
| 76 | + /** | |
| 77 | + * encodeAtom - Take three bytes of input and encode it as 4 | |
| 78 | + * printable characters. Note that if the length in len is less | |
| 79 | + * than three is encodes either one or two '=' signs to indicate | |
| 80 | + * padding characters. | |
| 81 | + */ | |
| 82 | + protected void encodeAtom(OutputStream outStream, byte data[], int offset, int len) | |
| 83 | + throws IOException { | |
| 84 | + byte a, b, c; | |
| 85 | + | |
| 86 | + if (len == 1) { | |
| 87 | + a = data[offset]; | |
| 88 | + b = 0; | |
| 89 | + c = 0; | |
| 90 | + outStream.write(pem_array[(a >>> 2) & 0x3F]); | |
| 91 | + outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); | |
| 92 | + outStream.write('='); | |
| 93 | + outStream.write('='); | |
| 94 | + } else if (len == 2) { | |
| 95 | + a = data[offset]; | |
| 96 | + b = data[offset+1]; | |
| 97 | + c = 0; | |
| 98 | + outStream.write(pem_array[(a >>> 2) & 0x3F]); | |
| 99 | + outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); | |
| 100 | + outStream.write(pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]); | |
| 101 | + outStream.write('='); | |
| 102 | + } else { | |
| 103 | + a = data[offset]; | |
| 104 | + b = data[offset+1]; | |
| 105 | + c = data[offset+2]; | |
| 106 | + outStream.write(pem_array[(a >>> 2) & 0x3F]); | |
| 107 | + outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); | |
| 108 | + outStream.write(pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]); | |
| 109 | + outStream.write(pem_array[c & 0x3F]); | |
| 110 | + } | |
| 111 | + } | |
| 112 | +} | |