Showing the changes to java/pkg/sun/misc/BASE64Encoder.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,112 @@ | |||
| 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 | } | ||