506 lines
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506 lines
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<title>mxBase64 (mxGraph 3.1.1.1 API Specification)</title>
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<div class="header">
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<div class="subTitle">com.mxgraph.util</div>
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<h2 title="Class mxBase64" class="title">Class mxBase64</h2>
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</div>
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<li>com.mxgraph.util.mxBase64</li>
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<br>
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<pre>public class <span class="strong">mxBase64</span>
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extends java.lang.Object</pre>
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<div class="block">A very fast and memory efficient class to encode and decode to and from BASE64 in full accordance
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with RFC 2045.<br><br>
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On Windows XP sp1 with 1.4.2_04 and later ;), this encoder and decoder is about 10 times faster
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on small arrays (10 - 1000 bytes) and 2-3 times as fast on larger arrays (10000 - 1000000 bytes)
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compared to <code>sun.misc.Encoder()/Decoder()</code>.<br><br>
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On byte arrays the encoder is about 20% faster than Jakarta Commons Base64 Codec for encode and
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about 50% faster for decoding large arrays. This implementation is about twice as fast on very small
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arrays (< 30 bytes). If source/destination is a <code>String</code> this
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version is about three times as fast due to the fact that the Commons Codec result has to be recoded
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to a <code>String</code> from <code>byte[]</code>, which is very expensive.<br><br>
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This encode/decode algorithm doesn't create any temporary arrays as many other codecs do, it only
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allocates the resulting array. This produces less garbage and it is possible to handle arrays twice
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as large as algorithms that create a temporary array. (E.g. Jakarta Commons Codec). It is unknown
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whether Sun's <code>sun.misc.Encoder()/Decoder()</code> produce temporary arrays but since performance
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is quite low it probably does.<br><br>
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The encoder produces the same output as the Sun one except that the Sun's encoder appends
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a trailing line separator if the last character isn't a pad. Unclear why but it only adds to the
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length and is probably a side effect. Both are in conformance with RFC 2045 though.<br>
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Commons codec seem to always att a trailing line separator.<br><br>
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<b>Note!</b>
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The encode/decode method pairs (types) come in three versions with the <b>exact</b> same algorithm and
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thus a lot of code redundancy. This is to not create any temporary arrays for transcoding to/from different
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format types. The methods not used can simply be commented out.<br><br>
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There is also a "fast" version of all decode methods that works the same way as the normal ones, but
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har a few demands on the decoded input. Normally though, these fast verions should be used if the source if
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the input is known and it hasn't bee tampered with.<br><br>
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If you find the code useful or you find a bug, please send me a note at base64 @ miginfocom . com.
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Licence (BSD):
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==============
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Copyright (c) 2004, Mikael Grev, MiG InfoCom AB. (base64 @ miginfocom . com)
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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Neither the name of the MiG InfoCom AB nor the names of its contributors may be
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used to endorse or promote products derived from this software without specific
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prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.</div>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#mxBase64()">mxBase64</a></strong>()</code> </td>
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</tr>
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</table>
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<h3>Method Summary</h3>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#decode(byte[])">decode</a></strong>(byte[] sArr)</code>
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<div class="block">Decodes a BASE64 encoded byte array.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#decode(char[])">decode</a></strong>(char[] sArr)</code>
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<div class="block">Decodes a BASE64 encoded char array.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#decode(java.lang.String)">decode</a></strong>(java.lang.String str)</code>
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<div class="block">Decodes a BASE64 encoded <code>String</code>.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#decodeFast(byte[])">decodeFast</a></strong>(byte[] sArr)</code>
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<div class="block">Decodes a BASE64 encoded byte array that is known to be resonably well formatted.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#decodeFast(char[])">decodeFast</a></strong>(char[] sArr)</code>
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<div class="block">Decodes a BASE64 encoded char array that is known to be resonably well formatted.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#decodeFast(java.lang.String)">decodeFast</a></strong>(java.lang.String s)</code>
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<div class="block">Decodes a BASE64 encoded string that is known to be resonably well formatted.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#encodeToByte(byte[], boolean)">encodeToByte</a></strong>(byte[] sArr,
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boolean lineSep)</code>
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<div class="block">Encodes a raw byte array into a BASE64 <code>byte[]</code> representation i accordance with RFC 2045.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static char[]</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#encodeToChar(byte[], boolean)">encodeToChar</a></strong>(byte[] sArr,
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boolean lineSep)</code>
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<div class="block">Encodes a raw byte array into a BASE64 <code>char[]</code> representation i accordance with RFC 2045.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static java.lang.String</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxBase64.html#encodeToString(byte[], boolean)">encodeToString</a></strong>(byte[] sArr,
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boolean lineSep)</code>
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<div class="block">Encodes a raw byte array into a BASE64 <code>String</code> representation i accordance with RFC 2045.</div>
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</td>
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</tr>
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</a>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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</ul>
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<h3>Constructor Detail</h3>
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<a name="mxBase64()">
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<h4>mxBase64</h4>
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<pre>public mxBase64()</pre>
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</li>
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</ul>
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<h4>encodeToChar</h4>
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<pre>public static final char[] encodeToChar(byte[] sArr,
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boolean lineSep)</pre>
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<div class="block">Encodes a raw byte array into a BASE64 <code>char[]</code> representation i accordance with RFC 2045.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sArr</code> - The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.</dd><dd><code>lineSep</code> - Optional "\r\n" after 76 characters, unless end of file.<br>
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No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
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little faster.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>A BASE64 encoded array. Never <code>null</code>.</dd></dl>
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</li>
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<h4>decode</h4>
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<pre>public static final byte[] decode(char[] sArr)</pre>
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<div class="block">Decodes a BASE64 encoded char array. All illegal characters will be ignored and can handle both arrays with
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and without line separators.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sArr</code> - The source array. <code>null</code> or length 0 will return an empty array.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
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(including '=') isn't divideable by 4. (I.e. definitely corrupted).</dd></dl>
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<h4>decodeFast</h4>
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<pre>public static final byte[] decodeFast(char[] sArr)</pre>
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<div class="block">Decodes a BASE64 encoded char array that is known to be resonably well formatted. The method is about twice as
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fast as <a href="../../../com/mxgraph/util/mxBase64.html#decode(char[])"><code>decode(char[])</code></a>. The preconditions are:<br>
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+ The array must have a line length of 76 chars OR no line separators at all (one line).<br>
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+ Line separator must be "\r\n", as specified in RFC 2045
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+ The array must not contain illegal characters within the encoded string<br>
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+ The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br></div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sArr</code> - The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>The decoded array of bytes. May be of length 0.</dd></dl>
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<h4>encodeToByte</h4>
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<pre>public static final byte[] encodeToByte(byte[] sArr,
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boolean lineSep)</pre>
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<div class="block">Encodes a raw byte array into a BASE64 <code>byte[]</code> representation i accordance with RFC 2045.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sArr</code> - The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.</dd><dd><code>lineSep</code> - Optional "\r\n" after 76 characters, unless end of file.<br>
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No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
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little faster.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>A BASE64 encoded array. Never <code>null</code>.</dd></dl>
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</li>
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<h4>decode</h4>
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<pre>public static final byte[] decode(byte[] sArr)</pre>
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<div class="block">Decodes a BASE64 encoded byte array. All illegal characters will be ignored and can handle both arrays with
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and without line separators.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sArr</code> - The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
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(including '=') isn't divideable by 4. (I.e. definitely corrupted).</dd></dl>
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<h4>decodeFast</h4>
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<pre>public static final byte[] decodeFast(byte[] sArr)</pre>
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<div class="block">Decodes a BASE64 encoded byte array that is known to be resonably well formatted. The method is about twice as
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fast as <a href="../../../com/mxgraph/util/mxBase64.html#decode(byte[])"><code>decode(byte[])</code></a>. The preconditions are:<br>
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+ The array must have a line length of 76 chars OR no line separators at all (one line).<br>
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+ Line separator must be "\r\n", as specified in RFC 2045
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+ The array must not contain illegal characters within the encoded string<br>
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+ The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br></div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sArr</code> - The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>The decoded array of bytes. May be of length 0.</dd></dl>
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<h4>encodeToString</h4>
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<pre>public static final java.lang.String encodeToString(byte[] sArr,
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boolean lineSep)</pre>
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<div class="block">Encodes a raw byte array into a BASE64 <code>String</code> representation i accordance with RFC 2045.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sArr</code> - The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.</dd><dd><code>lineSep</code> - Optional "\r\n" after 76 characters, unless end of file.<br>
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No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
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little faster.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>A BASE64 encoded array. Never <code>null</code>.</dd></dl>
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</li>
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</ul>
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<a name="decode(java.lang.String)">
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<h4>decode</h4>
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<pre>public static final byte[] decode(java.lang.String str)</pre>
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<div class="block">Decodes a BASE64 encoded <code>String</code>. All illegal characters will be ignored and can handle both strings with
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and without line separators.<br>
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<b>Note!</b> It can be up to about 2x the speed to call <code>decode(str.toCharArray())</code> instead. That
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will create a temporary array though. This version will use <code>str.charAt(i)</code> to iterate the string.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>str</code> - The source string. <code>null</code> or length 0 will return an empty array.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
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(including '=') isn't divideable by 4. (I.e. definitely corrupted).</dd></dl>
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</li>
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<a name="decodeFast(java.lang.String)">
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<h4>decodeFast</h4>
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<pre>public static final byte[] decodeFast(java.lang.String s)</pre>
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<div class="block">Decodes a BASE64 encoded string that is known to be resonably well formatted. The method is about twice as
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fast as <a href="../../../com/mxgraph/util/mxBase64.html#decode(java.lang.String)"><code>decode(String)</code></a>. The preconditions are:<br>
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+ The array must have a line length of 76 chars OR no line separators at all (one line).<br>
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+ Line separator must be "\r\n", as specified in RFC 2045
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+ The array must not contain illegal characters within the encoded string<br>
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+ The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br></div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>s</code> - The source string. Length 0 will return an empty array. <code>null</code> will throw an exception.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>The decoded array of bytes. May be of length 0.</dd></dl>
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