diff -r fd16c54261b3 -r 90ce3da70b43 jdk/src/share/classes/sun/misc/BASE64Encoder.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/jdk/src/share/classes/sun/misc/BASE64Encoder.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,112 @@ +/* + * Copyright 1995-1997 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Sun designates this + * particular file as subject to the "Classpath" exception as provided + * by Sun in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + */ +package sun.misc; + +import java.io.OutputStream; +import java.io.InputStream; +import java.io.PrintStream; +import java.io.IOException; + +/** + * This class implements a BASE64 Character encoder as specified in RFC1521. + * This RFC is part of the MIME specification as published by the Internet + * Engineering Task Force (IETF). Unlike some other encoding schemes there + * is nothing in this encoding that indicates + * where a buffer starts or ends. + * + * This means that the encoded text will simply start with the first line + * of encoded text and end with the last line of encoded text. + * + * @author Chuck McManis + * @see CharacterEncoder + * @see BASE64Decoder + */ + +public class BASE64Encoder extends CharacterEncoder { + + /** this class encodes three bytes per atom. */ + protected int bytesPerAtom() { + return (3); + } + + /** + * this class encodes 57 bytes per line. This results in a maximum + * of 57/3 * 4 or 76 characters per output line. Not counting the + * line termination. + */ + protected int bytesPerLine() { + return (57); + } + + /** This array maps the characters to their 6 bit values */ + private final static char pem_array[] = { + // 0 1 2 3 4 5 6 7 + 'A','B','C','D','E','F','G','H', // 0 + 'I','J','K','L','M','N','O','P', // 1 + 'Q','R','S','T','U','V','W','X', // 2 + 'Y','Z','a','b','c','d','e','f', // 3 + 'g','h','i','j','k','l','m','n', // 4 + 'o','p','q','r','s','t','u','v', // 5 + 'w','x','y','z','0','1','2','3', // 6 + '4','5','6','7','8','9','+','/' // 7 + }; + + /** + * encodeAtom - Take three bytes of input and encode it as 4 + * printable characters. Note that if the length in len is less + * than three is encodes either one or two '=' signs to indicate + * padding characters. + */ + protected void encodeAtom(OutputStream outStream, byte data[], int offset, int len) + throws IOException { + byte a, b, c; + + if (len == 1) { + a = data[offset]; + b = 0; + c = 0; + outStream.write(pem_array[(a >>> 2) & 0x3F]); + outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); + outStream.write('='); + outStream.write('='); + } else if (len == 2) { + a = data[offset]; + b = data[offset+1]; + c = 0; + outStream.write(pem_array[(a >>> 2) & 0x3F]); + outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); + outStream.write(pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]); + outStream.write('='); + } else { + a = data[offset]; + b = data[offset+1]; + c = data[offset+2]; + outStream.write(pem_array[(a >>> 2) & 0x3F]); + outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); + outStream.write(pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]); + outStream.write(pem_array[c & 0x3F]); + } + } +}