| /* Base64.java -- Base64 encoding and decoding. |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. |
| |
| -- |
| Base64 encoding derived from ISC's DHCP. Copyright notices from DHCP |
| follow. See http://www.isc.org/products/DHCP/. |
| |
| Copyright (c) 1996 by Internet Software Consortium. |
| |
| Permission to use, copy, modify, and distribute this software for any |
| purpose with or without fee is hereby granted, provided that the above |
| copyright notice and this permission notice appear in all copies. |
| |
| THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM |
| DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL |
| INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, |
| INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING |
| FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, |
| NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION |
| WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| -- |
| Portions Copyright (c) 1995 by International Business Machines, Inc. |
| |
| International Business Machines, Inc. (hereinafter called IBM) grants |
| permission under its copyrights to use, copy, modify, and distribute |
| this Software with or without fee, provided that the above copyright |
| notice and all paragraphs of this notice appear in all copies, and |
| that the name of IBM not be used in connection with the marketing of |
| any product incorporating the Software or modifications thereof, |
| without specific, written prior permission. |
| |
| To the extent it has a right to do so, IBM grants an immunity from |
| suit under its patents, if any, for the use, sale or manufacture of |
| products to the extent that such products are used for performing |
| Domain Name System dynamic updates in TCP/IP networks by means of the |
| Software. No immunity is granted for any product per se or for any |
| other function of any product. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES, |
| INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL, |
| DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER |
| ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| SOFTWARE, EVEN IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH |
| DAMAGES. */ |
| |
| |
| package gnu.javax.net.ssl; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| |
| public final class Base64 |
| { |
| |
| // No constructor. |
| private Base64() { } |
| |
| // Class methods. |
| // ------------------------------------------------------------------------- |
| |
| /** Base-64 characters. */ |
| private static final String BASE_64 = |
| "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| |
| /** Base-64 padding character. */ |
| private static final char BASE_64_PAD = '='; |
| |
| /** |
| * Base64 encode a byte array, returning the returning string. |
| * |
| * @param buf The byte array to encode. |
| * @param tw The total length of any line, 0 for unlimited. |
| * @return <tt>buf</tt> encoded in Base64. |
| */ |
| public static String encode(byte[] buf, int tw) |
| { |
| int srcLength = buf.length; |
| byte[] input = new byte[3]; |
| int[] output = new int[4]; |
| StringBuffer out = new StringBuffer(); |
| int i = 0; |
| int chars = 0; |
| |
| while (srcLength > 2) |
| { |
| input[0] = buf[i++]; |
| input[1] = buf[i++]; |
| input[2] = buf[i++]; |
| srcLength -= 3; |
| |
| output[0] = (input[0] & 0xff) >>> 2; |
| output[1] = ((input[0] & 0x03) << 4) + ((input[1] & 0xff) >>> 4); |
| output[2] = ((input[1] & 0x0f) << 2) + ((input[2] & 0xff) >>> 6); |
| output[3] = input[2] & 0x3f; |
| |
| out.append(BASE_64.charAt(output[0])); |
| if (tw > 0 && ++chars % tw == 0) |
| { |
| out.append("\n"); |
| } |
| out.append(BASE_64.charAt(output[1])); |
| if (tw > 0 && ++chars % tw == 0) |
| { |
| out.append("\n"); |
| } |
| out.append(BASE_64.charAt(output[2])); |
| if (tw > 0 && ++chars % tw == 0) |
| { |
| out.append("\n"); |
| } |
| out.append(BASE_64.charAt(output[3])); |
| if (tw > 0 && ++chars % tw == 0) |
| { |
| out.append("\n"); |
| } |
| } |
| |
| if (srcLength != 0) |
| { |
| input[0] = input[1] = input[2] = 0; |
| for (int j = 0; j < srcLength; j++) |
| { |
| input[j] = buf[i+j]; |
| } |
| output[0] = (input[0] & 0xff) >>> 2; |
| output[1] = ((input[0] & 0x03) << 4) + ((input[1] & 0xff) >>> 4); |
| output[2] = ((input[1] & 0x0f) << 2) + ((input[2] & 0xff) >>> 6); |
| |
| out.append(BASE_64.charAt(output[0])); |
| if (tw > 0 && ++chars % tw == 0) |
| { |
| out.append("\n"); |
| } |
| out.append(BASE_64.charAt(output[1])); |
| if (tw > 0 && ++chars % tw == 0) |
| { |
| out.append("\n"); |
| } |
| if (srcLength == 1) |
| { |
| out.append(BASE_64_PAD); |
| } |
| else |
| { |
| out.append(BASE_64.charAt(output[2])); |
| } |
| if (tw > 0 && ++chars % tw == 0) |
| { |
| out.append("\n"); |
| } |
| out.append(BASE_64_PAD); |
| if (tw > 0 && ++chars % tw == 0) |
| { |
| out.append("\n"); |
| } |
| } |
| if (tw > 0) |
| { |
| out.append("\n"); |
| } |
| |
| return out.toString(); |
| } |
| |
| /** |
| * Decode a Base-64 string into a byte array. |
| * |
| * @param b64 The Base-64 encoded string. |
| * @return The decoded bytes. |
| * @throws java.io.IOException If the argument is not a valid Base-64 |
| * encoding. |
| */ |
| public static byte[] decode(String b64) throws IOException |
| { |
| ByteArrayOutputStream result = new ByteArrayOutputStream(b64.length() / 3); |
| int state = 0, i; |
| byte temp = 0; |
| |
| for (i = 0; i < b64.length(); i++) |
| { |
| if (Character.isWhitespace(b64.charAt(i))) |
| { |
| continue; |
| } |
| if (b64.charAt(i) == BASE_64_PAD) |
| { |
| break; |
| } |
| |
| int pos = BASE_64.indexOf(b64.charAt(i)); |
| if (pos < 0) |
| { |
| throw new IOException("non-Base64 character " + b64.charAt(i)); |
| } |
| switch (state) |
| { |
| case 0: |
| temp = (byte) (pos - BASE_64.indexOf('A') << 2); |
| state = 1; |
| break; |
| |
| case 1: |
| temp |= (byte) (pos - BASE_64.indexOf('A') >>> 4); |
| result.write(temp); |
| temp = (byte) ((pos - BASE_64.indexOf('A') & 0x0f) << 4); |
| state = 2; |
| break; |
| |
| case 2: |
| temp |= (byte) ((pos - BASE_64.indexOf('A') & 0x7f) >>> 2); |
| result.write(temp); |
| temp = (byte) ((pos - BASE_64.indexOf('A') & 0x03) << 6); |
| state = 3; |
| break; |
| |
| case 3: |
| temp |= (byte) (pos - BASE_64.indexOf('A') & 0xff); |
| result.write(temp); |
| state = 0; |
| break; |
| |
| default: |
| throw new Error("this statement should be unreachable"); |
| } |
| } |
| |
| if (i < b64.length() && b64.charAt(i) == BASE_64_PAD) |
| { |
| switch (state) |
| { |
| case 0: |
| case 1: |
| throw new IOException("malformed Base64 sequence"); |
| |
| case 2: |
| for ( ; i < b64.length(); i++) |
| { |
| if (!Character.isWhitespace(b64.charAt(i))) |
| { |
| break; |
| } |
| } |
| // We must see a second pad character here. |
| if (b64.charAt(i) != BASE_64_PAD) |
| { |
| throw new IOException("malformed Base64 sequence"); |
| } |
| i++; |
| // Fall-through. |
| |
| case 3: |
| i++; |
| for ( ; i < b64.length(); i++) |
| { |
| // We should only see whitespace after this. |
| if (!Character.isWhitespace(b64.charAt(i))) |
| { |
| System.err.println(b64.charAt(i)); |
| throw new IOException("malformed Base64 sequence"); |
| } |
| } |
| } |
| } |
| else |
| { |
| if (state != 0) |
| { |
| throw new IOException("malformed Base64 sequence"); |
| } |
| } |
| |
| return result.toByteArray(); |
| } |
| } |
