author | martin |
Tue, 15 Sep 2015 21:56:04 -0700 | |
changeset 32649 | 2ee9017c7597 |
parent 25859 | 3317bb8137f4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1995, 1997, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.misc; |
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import java.io.OutputStream; |
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import java.io.InputStream; |
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import java.io.PrintStream; |
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import java.io.IOException; |
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/** |
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* This class implements a BASE64 Character encoder as specified in RFC1521. |
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* This RFC is part of the MIME specification as published by the Internet |
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* Engineering Task Force (IETF). Unlike some other encoding schemes there |
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* is nothing in this encoding that indicates |
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* where a buffer starts or ends. |
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* |
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* This means that the encoded text will simply start with the first line |
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* of encoded text and end with the last line of encoded text. |
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* |
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* @author Chuck McManis |
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* @see CharacterEncoder |
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* @see BASE64Decoder |
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*/ |
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public class BASE64Encoder extends CharacterEncoder { |
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/** this class encodes three bytes per atom. */ |
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protected int bytesPerAtom() { |
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return (3); |
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} |
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/** |
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* this class encodes 57 bytes per line. This results in a maximum |
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* of 57/3 * 4 or 76 characters per output line. Not counting the |
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* line termination. |
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*/ |
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protected int bytesPerLine() { |
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return (57); |
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} |
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/** This array maps the characters to their 6 bit values */ |
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32649
2ee9017c7597
8136583: Core libraries should use blessed modifier order
martin
parents:
25859
diff
changeset
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private static final char pem_array[] = { |
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// 0 1 2 3 4 5 6 7 |
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'A','B','C','D','E','F','G','H', // 0 |
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'I','J','K','L','M','N','O','P', // 1 |
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'Q','R','S','T','U','V','W','X', // 2 |
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'Y','Z','a','b','c','d','e','f', // 3 |
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'g','h','i','j','k','l','m','n', // 4 |
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'o','p','q','r','s','t','u','v', // 5 |
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'w','x','y','z','0','1','2','3', // 6 |
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'4','5','6','7','8','9','+','/' // 7 |
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}; |
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/** |
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* encodeAtom - Take three bytes of input and encode it as 4 |
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* printable characters. Note that if the length in len is less |
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* than three is encodes either one or two '=' signs to indicate |
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* padding characters. |
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*/ |
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protected void encodeAtom(OutputStream outStream, byte data[], int offset, int len) |
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throws IOException { |
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byte a, b, c; |
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if (len == 1) { |
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a = data[offset]; |
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b = 0; |
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c = 0; |
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outStream.write(pem_array[(a >>> 2) & 0x3F]); |
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outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); |
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outStream.write('='); |
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outStream.write('='); |
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} else if (len == 2) { |
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a = data[offset]; |
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b = data[offset+1]; |
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c = 0; |
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outStream.write(pem_array[(a >>> 2) & 0x3F]); |
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outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); |
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outStream.write(pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]); |
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outStream.write('='); |
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} else { |
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a = data[offset]; |
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b = data[offset+1]; |
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c = data[offset+2]; |
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outStream.write(pem_array[(a >>> 2) & 0x3F]); |
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outStream.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]); |
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outStream.write(pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]); |
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outStream.write(pem_array[c & 0x3F]); |
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} |
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} |
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} |