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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/util/Base64.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/util/Base64.java | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/util/Base64.java b/gcc-4.4.3/libjava/classpath/gnu/java/util/Base64.java new file mode 100644 index 000000000..4401a151a --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/util/Base64.java @@ -0,0 +1,342 @@ +/* Base64.java -- Base64 encoding and decoding. + Copyright (C) 2006, 2007 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.java.util; + +import gnu.java.lang.CPStringBuilder; + +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, with no line wrapping. + * + * @param buf The byte array to encode. + * @return <tt>buf</tt> encoded in Base64. + */ + public static String encode(byte[] buf) + { + return encode(buf, 0); + } + + /** + * 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) + { + return encode(buf, 0, buf.length, tw); + } + + /** + * Base64 encode a byte array, returning the returning string. + * + * @param buf The byte array to encode. + * @param offset The offset in the byte array to start. + * @param length The number of bytes 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 offset, int length, int tw) + { + if (offset < 0 || length < 0 || offset + length > buf.length) + throw new ArrayIndexOutOfBoundsException(buf.length + " " + + offset + " " + + length); + int srcLength = buf.length - offset; + byte[] input = new byte[3]; + int[] output = new int[4]; + CPStringBuilder out = new CPStringBuilder(); + int i = offset; + 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: + i++; + 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))) + { + throw new IOException("malformed Base64 sequence"); + } + } + } + } + else + { + if (state != 0) + { + throw new IOException("malformed Base64 sequence"); + } + } + + return result.toByteArray(); + } +} |