Google Git
Sign in
apache / shiro-site / 01016f43374d9b054f3ea1e568b015d5d69428f9 / . / src / site / assets / static / 1.2.4 / xref / org / apache / shiro / codec / Base64.html
blob: 180c77a6857233e686928816dc618cc7ed9aaf59 [file] [log] [blame]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" />
<title>Base64 xref</title>
<link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" />
</head>
<body>
<div id="overview"><a href="../../../../../apidocs/org/apache/shiro/codec/Base64.html">View Javadoc</a></div><pre>
<a name="1" href="#1">1</a> <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
<a name="3" href="#3">3</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em>
<a name="4" href="#4">4</a> <em class="jxr_comment"> * distributed with this work for additional information</em>
<a name="5" href="#5">5</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em>
<a name="6" href="#6">6</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em>
<a name="7" href="#7">7</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em>
<a name="8" href="#8">8</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em>
<a name="9" href="#9">9</a> <em class="jxr_comment"> *</em>
<a name="10" href="#10">10</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="11" href="#11">11</a> <em class="jxr_comment"> *</em>
<a name="12" href="#12">12</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em>
<a name="13" href="#13">13</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em>
<a name="14" href="#14">14</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
<a name="15" href="#15">15</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em>
<a name="16" href="#16">16</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em>
<a name="17" href="#17">17</a> <em class="jxr_comment"> * under the License.</em>
<a name="18" href="#18">18</a> <em class="jxr_comment"> */</em>
<a name="19" href="#19">19</a> <strong class="jxr_keyword">package</strong> org.apache.shiro.codec;
<a name="20" href="#20">20</a>
<a name="21" href="#21">21</a> <em class="jxr_javadoccomment">/**</em>
<a name="22" href="#22">22</a> <em class="jxr_javadoccomment"> * Provides &lt;a href="<a href="http://en.wikipedia.org/wiki/Base64" target="alexandria_uri">http://en.wikipedia.org/wiki/Base64</a>"&gt;Base 64&lt;/a&gt; encoding and decoding as defined by</em>
<a name="23" href="#23">23</a> <em class="jxr_javadoccomment"> * &lt;a href="<a href="http://www.ietf.org/rfc/rfc2045.txt" target="alexandria_uri">http://www.ietf.org/rfc/rfc2045.txt</a>"&gt;RFC 2045&lt;/a&gt;.</em>
<a name="24" href="#24">24</a> <em class="jxr_javadoccomment"> * &lt;p/&gt;</em>
<a name="25" href="#25">25</a> <em class="jxr_javadoccomment"> * This class implements section &lt;cite&gt;6.8. Base64 Content-Transfer-Encoding&lt;/cite&gt; from RFC 2045 &lt;cite&gt;Multipurpose</em>
<a name="26" href="#26">26</a> <em class="jxr_javadoccomment"> * Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies&lt;/cite&gt; by Freed and Borenstein.</em>
<a name="27" href="#27">27</a> <em class="jxr_javadoccomment"> * &lt;p/&gt;</em>
<a name="28" href="#28">28</a> <em class="jxr_javadoccomment"> * This class was borrowed from Apache Commons Codec SVN repository (rev. 618419) with modifications</em>
<a name="29" href="#29">29</a> <em class="jxr_javadoccomment"> * to enable Base64 conversion without a full dependecny on Commons Codec. We didn't want to reinvent the wheel of</em>
<a name="30" href="#30">30</a> <em class="jxr_javadoccomment"> * great work they've done, but also didn't want to force every Shiro user to depend on the commons-codec.jar</em>
<a name="31" href="#31">31</a> <em class="jxr_javadoccomment"> * &lt;p/&gt;</em>
<a name="32" href="#32">32</a> <em class="jxr_javadoccomment"> * As per the Apache 2.0 license, the original copyright notice and all author and copyright information have</em>
<a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> * remained in tact.</em>
<a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> *</em>
<a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * @see &lt;a href="<a href="http://en.wikipedia.org/wiki/Base64" target="alexandria_uri">http://en.wikipedia.org/wiki/Base64</a>"&gt;Wikipedia: Base 64&lt;/a&gt;</em>
<a name="36" href="#36">36</a> <em class="jxr_javadoccomment"> * @see &lt;a href="<a href="http://www.ietf.org/rfc/rfc2045.txt" target="alexandria_uri">http://www.ietf.org/rfc/rfc2045.txt</a>"&gt;RFC 2045&lt;/a&gt;</em>
<a name="37" href="#37">37</a> <em class="jxr_javadoccomment"> * @since 0.9</em>
<a name="38" href="#38">38</a> <em class="jxr_javadoccomment"> */</em>
<a name="39" href="#39">39</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> Base64 {
<a name="40" href="#40">40</a>
<a name="41" href="#41">41</a> <em class="jxr_javadoccomment">/**</em>
<a name="42" href="#42">42</a> <em class="jxr_javadoccomment"> * Chunk size per RFC 2045 section 6.8.</em>
<a name="43" href="#43">43</a> <em class="jxr_javadoccomment"> * &lt;p/&gt;</em>
<a name="44" href="#44">44</a> <em class="jxr_javadoccomment"> * The character limit does not count the trailing CRLF, but counts all other characters, including any</em>
<a name="45" href="#45">45</a> <em class="jxr_javadoccomment"> * equal signs.</em>
<a name="46" href="#46">46</a> <em class="jxr_javadoccomment"> *</em>
<a name="47" href="#47">47</a> <em class="jxr_javadoccomment"> * @see &lt;a href="<a href="http://www.ietf.org/rfc/rfc2045.txt" target="alexandria_uri">http://www.ietf.org/rfc/rfc2045.txt</a>"&gt;RFC 2045 section 6.8&lt;/a&gt;</em>
<a name="48" href="#48">48</a> <em class="jxr_javadoccomment"> */</em>
<a name="49" href="#49">49</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> CHUNK_SIZE = 76;
<a name="50" href="#50">50</a>
<a name="51" href="#51">51</a> <em class="jxr_javadoccomment">/**</em>
<a name="52" href="#52">52</a> <em class="jxr_javadoccomment"> * Chunk separator per RFC 2045 section 2.1.</em>
<a name="53" href="#53">53</a> <em class="jxr_javadoccomment"> *</em>
<a name="54" href="#54">54</a> <em class="jxr_javadoccomment"> * @see &lt;a href="<a href="http://www.ietf.org/rfc/rfc2045.txt" target="alexandria_uri">http://www.ietf.org/rfc/rfc2045.txt</a>"&gt;RFC 2045 section 2.1&lt;/a&gt;</em>
<a name="55" href="#55">55</a> <em class="jxr_javadoccomment"> */</em>
<a name="56" href="#56">56</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte[] CHUNK_SEPARATOR = <span class="jxr_string">"\r\n"</span>.getBytes();
<a name="57" href="#57">57</a>
<a name="58" href="#58">58</a> <em class="jxr_javadoccomment">/**</em>
<a name="59" href="#59">59</a> <em class="jxr_javadoccomment"> * The base length.</em>
<a name="60" href="#60">60</a> <em class="jxr_javadoccomment"> */</em>
<a name="61" href="#61">61</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> BASELENGTH = 255;
<a name="62" href="#62">62</a>
<a name="63" href="#63">63</a> <em class="jxr_javadoccomment">/**</em>
<a name="64" href="#64">64</a> <em class="jxr_javadoccomment"> * Lookup length.</em>
<a name="65" href="#65">65</a> <em class="jxr_javadoccomment"> */</em>
<a name="66" href="#66">66</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> LOOKUPLENGTH = 64;
<a name="67" href="#67">67</a>
<a name="68" href="#68">68</a> <em class="jxr_javadoccomment">/**</em>
<a name="69" href="#69">69</a> <em class="jxr_javadoccomment"> * Used to calculate the number of bits in a byte.</em>
<a name="70" href="#70">70</a> <em class="jxr_javadoccomment"> */</em>
<a name="71" href="#71">71</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> EIGHTBIT = 8;
<a name="72" href="#72">72</a>
<a name="73" href="#73">73</a> <em class="jxr_javadoccomment">/**</em>
<a name="74" href="#74">74</a> <em class="jxr_javadoccomment"> * Used when encoding something which has fewer than 24 bits.</em>
<a name="75" href="#75">75</a> <em class="jxr_javadoccomment"> */</em>
<a name="76" href="#76">76</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> SIXTEENBIT = 16;
<a name="77" href="#77">77</a>
<a name="78" href="#78">78</a> <em class="jxr_javadoccomment">/**</em>
<a name="79" href="#79">79</a> <em class="jxr_javadoccomment"> * Used to determine how many bits data contains.</em>
<a name="80" href="#80">80</a> <em class="jxr_javadoccomment"> */</em>
<a name="81" href="#81">81</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> TWENTYFOURBITGROUP = 24;
<a name="82" href="#82">82</a>
<a name="83" href="#83">83</a> <em class="jxr_javadoccomment">/**</em>
<a name="84" href="#84">84</a> <em class="jxr_javadoccomment"> * Used to get the number of Quadruples.</em>
<a name="85" href="#85">85</a> <em class="jxr_javadoccomment"> */</em>
<a name="86" href="#86">86</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> FOURBYTE = 4;
<a name="87" href="#87">87</a>
<a name="88" href="#88">88</a> <em class="jxr_javadoccomment">/**</em>
<a name="89" href="#89">89</a> <em class="jxr_javadoccomment"> * Used to test the sign of a byte.</em>
<a name="90" href="#90">90</a> <em class="jxr_javadoccomment"> */</em>
<a name="91" href="#91">91</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> SIGN = -128;
<a name="92" href="#92">92</a>
<a name="93" href="#93">93</a> <em class="jxr_javadoccomment">/**</em>
<a name="94" href="#94">94</a> <em class="jxr_javadoccomment"> * Byte used to pad output.</em>
<a name="95" href="#95">95</a> <em class="jxr_javadoccomment"> */</em>
<a name="96" href="#96">96</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte PAD = (byte) '=';
<a name="97" href="#97">97</a>
<a name="98" href="#98">98</a> <em class="jxr_javadoccomment">/**</em>
<a name="99" href="#99">99</a> <em class="jxr_javadoccomment"> * Contains the Base64 values &lt;code&gt;0&lt;/code&gt; through &lt;code&gt;63&lt;/code&gt; accessed by using character encodings as</em>
<a name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * indices.</em>
<a name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * &lt;p/&gt;</em>
<a name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * &lt;p&gt;For example, &lt;code&gt;base64Alphabet['+']&lt;/code&gt; returns &lt;code&gt;62&lt;/code&gt;.&lt;/p&gt;</em>
<a name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * &lt;p/&gt;</em>
<a name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * &lt;p&gt;The value of undefined encodings is &lt;code&gt;-1&lt;/code&gt;.&lt;/p&gt;</em>
<a name="105" href="#105">105</a> <em class="jxr_javadoccomment"> */</em>
<a name="106" href="#106">106</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte[] base64Alphabet = <strong class="jxr_keyword">new</strong> byte[BASELENGTH];
<a name="107" href="#107">107</a>
<a name="108" href="#108">108</a> <em class="jxr_javadoccomment">/**</em>
<a name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * &lt;p&gt;Contains the Base64 encodings &lt;code&gt;A&lt;/code&gt; through &lt;code&gt;Z&lt;/code&gt;, followed by &lt;code&gt;a&lt;/code&gt; through</em>
<a name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * &lt;code&gt;z&lt;/code&gt;, followed by &lt;code&gt;0&lt;/code&gt; through &lt;code&gt;9&lt;/code&gt;, followed by &lt;code&gt;+&lt;/code&gt;, and</em>
<a name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * &lt;code&gt;/&lt;/code&gt;.&lt;/p&gt;</em>
<a name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * &lt;p/&gt;</em>
<a name="113" href="#113">113</a> <em class="jxr_javadoccomment"> * &lt;p&gt;This array is accessed by using character values as indices.&lt;/p&gt;</em>
<a name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * &lt;p/&gt;</em>
<a name="115" href="#115">115</a> <em class="jxr_javadoccomment"> * &lt;p&gt;For example, &lt;code&gt;lookUpBase64Alphabet[62] &lt;/code&gt; returns &lt;code&gt;'+'&lt;/code&gt;.&lt;/p&gt;</em>
<a name="116" href="#116">116</a> <em class="jxr_javadoccomment"> */</em>
<a name="117" href="#117">117</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte[] lookUpBase64Alphabet = <strong class="jxr_keyword">new</strong> byte[LOOKUPLENGTH];
<a name="118" href="#118">118</a>
<a name="119" href="#119">119</a> <em class="jxr_comment">// Populating the lookup and character arrays</em>
<a name="120" href="#120">120</a>
<a name="121" href="#121">121</a> <strong class="jxr_keyword">static</strong> {
<a name="122" href="#122">122</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; BASELENGTH; i++) {
<a name="123" href="#123">123</a> base64Alphabet[i] = (byte) -1;
<a name="124" href="#124">124</a> }
<a name="125" href="#125">125</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 'Z'; i &gt;= 'A'; i--) {
<a name="126" href="#126">126</a> base64Alphabet[i] = (byte) (i - 'A');
<a name="127" href="#127">127</a> }
<a name="128" href="#128">128</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 'z'; i &gt;= 'a'; i--) {
<a name="129" href="#129">129</a> base64Alphabet[i] = (byte) (i - 'a' + 26);
<a name="130" href="#130">130</a> }
<a name="131" href="#131">131</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = '9'; i &gt;= '0'; i--) {
<a name="132" href="#132">132</a> base64Alphabet[i] = (byte) (i - '0' + 52);
<a name="133" href="#133">133</a> }
<a name="134" href="#134">134</a>
<a name="135" href="#135">135</a> base64Alphabet['+'] = 62;
<a name="136" href="#136">136</a> base64Alphabet['/'] = 63;
<a name="137" href="#137">137</a>
<a name="138" href="#138">138</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt;= 25; i++) {
<a name="139" href="#139">139</a> lookUpBase64Alphabet[i] = (byte) ('A' + i);
<a name="140" href="#140">140</a> }
<a name="141" href="#141">141</a>
<a name="142" href="#142">142</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 26, j = 0; i &lt;= 51; i++, j++) {
<a name="143" href="#143">143</a> lookUpBase64Alphabet[i] = (byte) ('a' + j);
<a name="144" href="#144">144</a> }
<a name="145" href="#145">145</a>
<a name="146" href="#146">146</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 52, j = 0; i &lt;= 61; i++, j++) {
<a name="147" href="#147">147</a> lookUpBase64Alphabet[i] = (byte) ('0' + j);
<a name="148" href="#148">148</a> }
<a name="149" href="#149">149</a>
<a name="150" href="#150">150</a> lookUpBase64Alphabet[62] = (byte) '+';
<a name="151" href="#151">151</a> lookUpBase64Alphabet[63] = (byte) '/';
<a name="152" href="#152">152</a> }
<a name="153" href="#153">153</a>
<a name="154" href="#154">154</a> <em class="jxr_javadoccomment">/**</em>
<a name="155" href="#155">155</a> <em class="jxr_javadoccomment"> * Returns whether or not the &lt;code&gt;octect&lt;/code&gt; is in the base 64 alphabet.</em>
<a name="156" href="#156">156</a> <em class="jxr_javadoccomment"> *</em>
<a name="157" href="#157">157</a> <em class="jxr_javadoccomment"> * @param octect The value to test</em>
<a name="158" href="#158">158</a> <em class="jxr_javadoccomment"> * @return &lt;code&gt;true&lt;/code&gt; if the value is defined in the the base 64 alphabet, &lt;code&gt;false&lt;/code&gt; otherwise.</em>
<a name="159" href="#159">159</a> <em class="jxr_javadoccomment"> */</em>
<a name="160" href="#160">160</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> isBase64(byte octect) {
<a name="161" href="#161">161</a> <strong class="jxr_keyword">if</strong> (octect == PAD) {
<a name="162" href="#162">162</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="163" href="#163">163</a> } <strong class="jxr_keyword">else</strong> <em class="jxr_comment">//noinspection RedundantIfStatement</em>
<a name="164" href="#164">164</a> <strong class="jxr_keyword">if</strong> (octect &lt; 0 || base64Alphabet[octect] == -1) {
<a name="165" href="#165">165</a> <strong class="jxr_keyword">return</strong> false;
<a name="166" href="#166">166</a> } <strong class="jxr_keyword">else</strong> {
<a name="167" href="#167">167</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="168" href="#168">168</a> }
<a name="169" href="#169">169</a> }
<a name="170" href="#170">170</a>
<a name="171" href="#171">171</a> <em class="jxr_javadoccomment">/**</em>
<a name="172" href="#172">172</a> <em class="jxr_javadoccomment"> * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.</em>
<a name="173" href="#173">173</a> <em class="jxr_javadoccomment"> *</em>
<a name="174" href="#174">174</a> <em class="jxr_javadoccomment"> * @param arrayOctect byte array to test</em>
<a name="175" href="#175">175</a> <em class="jxr_javadoccomment"> * @return &lt;code&gt;true&lt;/code&gt; if all bytes are valid characters in the Base64 alphabet or if the byte array is</em>
<a name="176" href="#176">176</a> <em class="jxr_javadoccomment"> * empty; false, otherwise</em>
<a name="177" href="#177">177</a> <em class="jxr_javadoccomment"> */</em>
<a name="178" href="#178">178</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> isBase64(byte[] arrayOctect) {
<a name="179" href="#179">179</a>
<a name="180" href="#180">180</a> arrayOctect = discardWhitespace(arrayOctect);
<a name="181" href="#181">181</a>
<a name="182" href="#182">182</a> <strong class="jxr_keyword">int</strong> length = arrayOctect.length;
<a name="183" href="#183">183</a> <strong class="jxr_keyword">if</strong> (length == 0) {
<a name="184" href="#184">184</a> <em class="jxr_comment">// shouldn't a 0 length array be valid base64 data?</em>
<a name="185" href="#185">185</a> <em class="jxr_comment">// return false;</em>
<a name="186" href="#186">186</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="187" href="#187">187</a> }
<a name="188" href="#188">188</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; length; i++) {
<a name="189" href="#189">189</a> <strong class="jxr_keyword">if</strong> (!isBase64(arrayOctect[i])) {
<a name="190" href="#190">190</a> <strong class="jxr_keyword">return</strong> false;
<a name="191" href="#191">191</a> }
<a name="192" href="#192">192</a> }
<a name="193" href="#193">193</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="194" href="#194">194</a> }
<a name="195" href="#195">195</a>
<a name="196" href="#196">196</a> <em class="jxr_javadoccomment">/**</em>
<a name="197" href="#197">197</a> <em class="jxr_javadoccomment"> * Discards any whitespace from a base-64 encoded block.</em>
<a name="198" href="#198">198</a> <em class="jxr_javadoccomment"> *</em>
<a name="199" href="#199">199</a> <em class="jxr_javadoccomment"> * @param data The base-64 encoded data to discard the whitespace from.</em>
<a name="200" href="#200">200</a> <em class="jxr_javadoccomment"> * @return The data, less whitespace (see RFC 2045).</em>
<a name="201" href="#201">201</a> <em class="jxr_javadoccomment"> */</em>
<a name="202" href="#202">202</a> <strong class="jxr_keyword">static</strong> byte[] discardWhitespace(byte[] data) {
<a name="203" href="#203">203</a> byte groomedData[] = <strong class="jxr_keyword">new</strong> byte[data.length];
<a name="204" href="#204">204</a> <strong class="jxr_keyword">int</strong> bytesCopied = 0;
<a name="205" href="#205">205</a>
<a name="206" href="#206">206</a> <strong class="jxr_keyword">for</strong> (byte aByte : data) {
<a name="207" href="#207">207</a> <strong class="jxr_keyword">switch</strong> (aByte) {
<a name="208" href="#208">208</a> <strong class="jxr_keyword">case</strong> (byte) ' ':
<a name="209" href="#209">209</a> <strong class="jxr_keyword">case</strong> (byte) '\n':
<a name="210" href="#210">210</a> <strong class="jxr_keyword">case</strong> (byte) '\r':
<a name="211" href="#211">211</a> <strong class="jxr_keyword">case</strong> (byte) '\t':
<a name="212" href="#212">212</a> <strong class="jxr_keyword">break</strong>;
<a name="213" href="#213">213</a> <strong class="jxr_keyword">default</strong>:
<a name="214" href="#214">214</a> groomedData[bytesCopied++] = aByte;
<a name="215" href="#215">215</a> }
<a name="216" href="#216">216</a> }
<a name="217" href="#217">217</a>
<a name="218" href="#218">218</a> byte packedData[] = <strong class="jxr_keyword">new</strong> byte[bytesCopied];
<a name="219" href="#219">219</a>
<a name="220" href="#220">220</a> System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);
<a name="221" href="#221">221</a>
<a name="222" href="#222">222</a> <strong class="jxr_keyword">return</strong> packedData;
<a name="223" href="#223">223</a> }
<a name="224" href="#224">224</a>
<a name="225" href="#225">225</a> <em class="jxr_javadoccomment">/**</em>
<a name="226" href="#226">226</a> <em class="jxr_javadoccomment"> * Base64 encodes the specified byte array and then encodes it as a String using Shiro's preferred character</em>
<a name="227" href="#227">227</a> <em class="jxr_javadoccomment"> * encoding (UTF-8).</em>
<a name="228" href="#228">228</a> <em class="jxr_javadoccomment"> *</em>
<a name="229" href="#229">229</a> <em class="jxr_javadoccomment"> * @param bytes the byte array to Base64 encode.</em>
<a name="230" href="#230">230</a> <em class="jxr_javadoccomment"> * @return a UTF-8 encoded String of the resulting Base64 encoded byte array.</em>
<a name="231" href="#231">231</a> <em class="jxr_javadoccomment"> */</em>
<a name="232" href="#232">232</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String encodeToString(byte[] bytes) {
<a name="233" href="#233">233</a> byte[] encoded = encode(bytes);
<a name="234" href="#234">234</a> <strong class="jxr_keyword">return</strong> CodecSupport.toString(encoded);
<a name="235" href="#235">235</a> }
<a name="236" href="#236">236</a>
<a name="237" href="#237">237</a> <em class="jxr_javadoccomment">/**</em>
<a name="238" href="#238">238</a> <em class="jxr_javadoccomment"> * Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks</em>
<a name="239" href="#239">239</a> <em class="jxr_javadoccomment"> *</em>
<a name="240" href="#240">240</a> <em class="jxr_javadoccomment"> * @param binaryData binary data to encodeToChars</em>
<a name="241" href="#241">241</a> <em class="jxr_javadoccomment"> * @return Base64 characters chunked in 76 character blocks</em>
<a name="242" href="#242">242</a> <em class="jxr_javadoccomment"> */</em>
<a name="243" href="#243">243</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> byte[] encodeChunked(byte[] binaryData) {
<a name="244" href="#244">244</a> <strong class="jxr_keyword">return</strong> encode(binaryData, <strong class="jxr_keyword">true</strong>);
<a name="245" href="#245">245</a> }
<a name="246" href="#246">246</a>
<a name="247" href="#247">247</a> <em class="jxr_javadoccomment">/**</em>
<a name="248" href="#248">248</a> <em class="jxr_javadoccomment"> * Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64 alphabet.</em>
<a name="249" href="#249">249</a> <em class="jxr_javadoccomment"> *</em>
<a name="250" href="#250">250</a> <em class="jxr_javadoccomment"> * @param pArray a byte array containing binary data</em>
<a name="251" href="#251">251</a> <em class="jxr_javadoccomment"> * @return A byte array containing only Base64 character data</em>
<a name="252" href="#252">252</a> <em class="jxr_javadoccomment"> */</em>
<a name="253" href="#253">253</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> byte[] encode(byte[] pArray) {
<a name="254" href="#254">254</a> <strong class="jxr_keyword">return</strong> encode(pArray, false);
<a name="255" href="#255">255</a> }
<a name="256" href="#256">256</a>
<a name="257" href="#257">257</a> <em class="jxr_javadoccomment">/**</em>
<a name="258" href="#258">258</a> <em class="jxr_javadoccomment"> * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.</em>
<a name="259" href="#259">259</a> <em class="jxr_javadoccomment"> *</em>
<a name="260" href="#260">260</a> <em class="jxr_javadoccomment"> * @param binaryData Array containing binary data to encodeToChars.</em>
<a name="261" href="#261">261</a> <em class="jxr_javadoccomment"> * @param isChunked if &lt;code&gt;true&lt;/code&gt; this encoder will chunk the base64 output into 76 character blocks</em>
<a name="262" href="#262">262</a> <em class="jxr_javadoccomment"> * @return Base64-encoded data.</em>
<a name="263" href="#263">263</a> <em class="jxr_javadoccomment"> * @throws IllegalArgumentException Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}</em>
<a name="264" href="#264">264</a> <em class="jxr_javadoccomment"> */</em>
<a name="265" href="#265">265</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> byte[] encode(byte[] binaryData, <strong class="jxr_keyword">boolean</strong> isChunked) {
<a name="266" href="#266">266</a> <strong class="jxr_keyword">long</strong> binaryDataLength = binaryData.length;
<a name="267" href="#267">267</a> <strong class="jxr_keyword">long</strong> lengthDataBits = binaryDataLength * EIGHTBIT;
<a name="268" href="#268">268</a> <strong class="jxr_keyword">long</strong> fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
<a name="269" href="#269">269</a> <strong class="jxr_keyword">long</strong> tripletCount = lengthDataBits / TWENTYFOURBITGROUP;
<a name="270" href="#270">270</a> <strong class="jxr_keyword">long</strong> encodedDataLengthLong;
<a name="271" href="#271">271</a> <strong class="jxr_keyword">int</strong> chunckCount = 0;
<a name="272" href="#272">272</a>
<a name="273" href="#273">273</a> <strong class="jxr_keyword">if</strong> (fewerThan24bits != 0) {
<a name="274" href="#274">274</a> <em class="jxr_comment">// data not divisible by 24 bit</em>
<a name="275" href="#275">275</a> encodedDataLengthLong = (tripletCount + 1) * 4;
<a name="276" href="#276">276</a> } <strong class="jxr_keyword">else</strong> {
<a name="277" href="#277">277</a> <em class="jxr_comment">// 16 or 8 bit</em>
<a name="278" href="#278">278</a> encodedDataLengthLong = tripletCount * 4;
<a name="279" href="#279">279</a> }
<a name="280" href="#280">280</a>
<a name="281" href="#281">281</a> <em class="jxr_comment">// If the output is to be "chunked" into 76 character sections,</em>
<a name="282" href="#282">282</a> <em class="jxr_comment">// for compliance with RFC 2045 MIME, then it is important to</em>
<a name="283" href="#283">283</a> <em class="jxr_comment">// allow for extra length to account for the separator(s)</em>
<a name="284" href="#284">284</a> <strong class="jxr_keyword">if</strong> (isChunked) {
<a name="285" href="#285">285</a>
<a name="286" href="#286">286</a> chunckCount = (CHUNK_SEPARATOR.length == 0 ? 0 : (<strong class="jxr_keyword">int</strong>) Math
<a name="287" href="#287">287</a> .ceil((<strong class="jxr_keyword">float</strong>) encodedDataLengthLong / CHUNK_SIZE));
<a name="288" href="#288">288</a> encodedDataLengthLong += chunckCount * CHUNK_SEPARATOR.length;
<a name="289" href="#289">289</a> }
<a name="290" href="#290">290</a>
<a name="291" href="#291">291</a> <strong class="jxr_keyword">if</strong> (encodedDataLengthLong &gt; Integer.MAX_VALUE) {
<a name="292" href="#292">292</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a name="293" href="#293">293</a> <span class="jxr_string">"Input array too big, output array would be bigger than Integer.MAX_VALUE="</span> + Integer.MAX_VALUE);
<a name="294" href="#294">294</a> }
<a name="295" href="#295">295</a> <strong class="jxr_keyword">int</strong> encodedDataLength = (<strong class="jxr_keyword">int</strong>) encodedDataLengthLong;
<a name="296" href="#296">296</a> byte encodedData[] = <strong class="jxr_keyword">new</strong> byte[encodedDataLength];
<a name="297" href="#297">297</a>
<a name="298" href="#298">298</a> byte k, l, b1, b2, b3;
<a name="299" href="#299">299</a>
<a name="300" href="#300">300</a> <strong class="jxr_keyword">int</strong> encodedIndex = 0;
<a name="301" href="#301">301</a> <strong class="jxr_keyword">int</strong> dataIndex;
<a name="302" href="#302">302</a> <strong class="jxr_keyword">int</strong> i;
<a name="303" href="#303">303</a> <strong class="jxr_keyword">int</strong> nextSeparatorIndex = CHUNK_SIZE;
<a name="304" href="#304">304</a> <strong class="jxr_keyword">int</strong> chunksSoFar = 0;
<a name="305" href="#305">305</a>
<a name="306" href="#306">306</a> <em class="jxr_comment">// log.debug("number of triplets = " + numberTriplets);</em>
<a name="307" href="#307">307</a> <strong class="jxr_keyword">for</strong> (i = 0; i &lt; tripletCount; i++) {
<a name="308" href="#308">308</a> dataIndex = i * 3;
<a name="309" href="#309">309</a> b1 = binaryData[dataIndex];
<a name="310" href="#310">310</a> b2 = binaryData[dataIndex + 1];
<a name="311" href="#311">311</a> b3 = binaryData[dataIndex + 2];
<a name="312" href="#312">312</a>
<a name="313" href="#313">313</a> <em class="jxr_comment">// log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);</em>
<a name="314" href="#314">314</a>
<a name="315" href="#315">315</a> l = (byte) (b2 &amp; 0x0f);
<a name="316" href="#316">316</a> k = (byte) (b1 &amp; 0x03);
<a name="317" href="#317">317</a>
<a name="318" href="#318">318</a> byte val1 = ((b1 &amp; SIGN) == 0) ? (byte) (b1 &gt;&gt; 2) : (byte) ((b1) &gt;&gt; 2 ^ 0xc0);
<a name="319" href="#319">319</a> byte val2 = ((b2 &amp; SIGN) == 0) ? (byte) (b2 &gt;&gt; 4) : (byte) ((b2) &gt;&gt; 4 ^ 0xf0);
<a name="320" href="#320">320</a> byte val3 = ((b3 &amp; SIGN) == 0) ? (byte) (b3 &gt;&gt; 6) : (byte) ((b3) &gt;&gt; 6 ^ 0xfc);
<a name="321" href="#321">321</a>
<a name="322" href="#322">322</a> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
<a name="323" href="#323">323</a> <em class="jxr_comment">// log.debug( "val2 = " + val2 );</em>
<a name="324" href="#324">324</a> <em class="jxr_comment">// log.debug( "k4 = " + (k&lt;&lt;4) );</em>
<a name="325" href="#325">325</a> <em class="jxr_comment">// log.debug( "vak = " + (val2 | (k&lt;&lt;4)) );</em>
<a name="326" href="#326">326</a> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k &lt;&lt; 4)];
<a name="327" href="#327">327</a> encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l &lt;&lt; 2) | val3];
<a name="328" href="#328">328</a> encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 &amp; 0x3f];
<a name="329" href="#329">329</a>
<a name="330" href="#330">330</a> encodedIndex += 4;
<a name="331" href="#331">331</a>
<a name="332" href="#332">332</a> <em class="jxr_comment">// If we are chunking, let's put a chunk separator down.</em>
<a name="333" href="#333">333</a> <strong class="jxr_keyword">if</strong> (isChunked) {
<a name="334" href="#334">334</a> <em class="jxr_comment">// this assumes that CHUNK_SIZE % 4 == 0</em>
<a name="335" href="#335">335</a> <strong class="jxr_keyword">if</strong> (encodedIndex == nextSeparatorIndex) {
<a name="336" href="#336">336</a> System.arraycopy(CHUNK_SEPARATOR, 0, encodedData, encodedIndex, CHUNK_SEPARATOR.length);
<a name="337" href="#337">337</a> chunksSoFar++;
<a name="338" href="#338">338</a> nextSeparatorIndex = (CHUNK_SIZE * (chunksSoFar + 1)) + (chunksSoFar * CHUNK_SEPARATOR.length);
<a name="339" href="#339">339</a> encodedIndex += CHUNK_SEPARATOR.length;
<a name="340" href="#340">340</a> }
<a name="341" href="#341">341</a> }
<a name="342" href="#342">342</a> }
<a name="343" href="#343">343</a>
<a name="344" href="#344">344</a> <em class="jxr_comment">// form integral number of 6-bit groups</em>
<a name="345" href="#345">345</a> dataIndex = i * 3;
<a name="346" href="#346">346</a>
<a name="347" href="#347">347</a> <strong class="jxr_keyword">if</strong> (fewerThan24bits == EIGHTBIT) {
<a name="348" href="#348">348</a> b1 = binaryData[dataIndex];
<a name="349" href="#349">349</a> k = (byte) (b1 &amp; 0x03);
<a name="350" href="#350">350</a> <em class="jxr_comment">// log.debug("b1=" + b1);</em>
<a name="351" href="#351">351</a> <em class="jxr_comment">// log.debug("b1&lt;&lt;2 = " + (b1&gt;&gt;2) );</em>
<a name="352" href="#352">352</a> byte val1 = ((b1 &amp; SIGN) == 0) ? (byte) (b1 &gt;&gt; 2) : (byte) ((b1) &gt;&gt; 2 ^ 0xc0);
<a name="353" href="#353">353</a> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
<a name="354" href="#354">354</a> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k &lt;&lt; 4];
<a name="355" href="#355">355</a> encodedData[encodedIndex + 2] = PAD;
<a name="356" href="#356">356</a> encodedData[encodedIndex + 3] = PAD;
<a name="357" href="#357">357</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (fewerThan24bits == SIXTEENBIT) {
<a name="358" href="#358">358</a>
<a name="359" href="#359">359</a> b1 = binaryData[dataIndex];
<a name="360" href="#360">360</a> b2 = binaryData[dataIndex + 1];
<a name="361" href="#361">361</a> l = (byte) (b2 &amp; 0x0f);
<a name="362" href="#362">362</a> k = (byte) (b1 &amp; 0x03);
<a name="363" href="#363">363</a>
<a name="364" href="#364">364</a> byte val1 = ((b1 &amp; SIGN) == 0) ? (byte) (b1 &gt;&gt; 2) : (byte) ((b1) &gt;&gt; 2 ^ 0xc0);
<a name="365" href="#365">365</a> byte val2 = ((b2 &amp; SIGN) == 0) ? (byte) (b2 &gt;&gt; 4) : (byte) ((b2) &gt;&gt; 4 ^ 0xf0);
<a name="366" href="#366">366</a>
<a name="367" href="#367">367</a> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
<a name="368" href="#368">368</a> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k &lt;&lt; 4)];
<a name="369" href="#369">369</a> encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l &lt;&lt; 2];
<a name="370" href="#370">370</a> encodedData[encodedIndex + 3] = PAD;
<a name="371" href="#371">371</a> }
<a name="372" href="#372">372</a>
<a name="373" href="#373">373</a> <strong class="jxr_keyword">if</strong> (isChunked) {
<a name="374" href="#374">374</a> <em class="jxr_comment">// we also add a separator to the end of the final chunk.</em>
<a name="375" href="#375">375</a> <strong class="jxr_keyword">if</strong> (chunksSoFar &lt; chunckCount) {
<a name="376" href="#376">376</a> System.arraycopy(CHUNK_SEPARATOR, 0, encodedData, encodedDataLength - CHUNK_SEPARATOR.length,
<a name="377" href="#377">377</a> CHUNK_SEPARATOR.length);
<a name="378" href="#378">378</a> }
<a name="379" href="#379">379</a> }
<a name="380" href="#380">380</a>
<a name="381" href="#381">381</a> <strong class="jxr_keyword">return</strong> encodedData;
<a name="382" href="#382">382</a> }
<a name="383" href="#383">383</a>
<a name="384" href="#384">384</a> <em class="jxr_javadoccomment">/**</em>
<a name="385" href="#385">385</a> <em class="jxr_javadoccomment"> * Converts the specified UTF-8 Base64 encoded String and decodes it to a resultant UTF-8 encoded string.</em>
<a name="386" href="#386">386</a> <em class="jxr_javadoccomment"> *</em>
<a name="387" href="#387">387</a> <em class="jxr_javadoccomment"> * @param base64Encoded a UTF-8 Base64 encoded String</em>
<a name="388" href="#388">388</a> <em class="jxr_javadoccomment"> * @return the decoded String, UTF-8 encoded.</em>
<a name="389" href="#389">389</a> <em class="jxr_javadoccomment"> */</em>
<a name="390" href="#390">390</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String decodeToString(String base64Encoded) {
<a name="391" href="#391">391</a> byte[] encodedBytes = CodecSupport.toBytes(base64Encoded);
<a name="392" href="#392">392</a> <strong class="jxr_keyword">return</strong> decodeToString(encodedBytes);
<a name="393" href="#393">393</a> }
<a name="394" href="#394">394</a>
<a name="395" href="#395">395</a> <em class="jxr_javadoccomment">/**</em>
<a name="396" href="#396">396</a> <em class="jxr_javadoccomment"> * Decodes the specified Base64 encoded byte array and returns the decoded result as a UTF-8 encoded.</em>
<a name="397" href="#397">397</a> <em class="jxr_javadoccomment"> *</em>
<a name="398" href="#398">398</a> <em class="jxr_javadoccomment"> * @param base64Encoded a Base64 encoded byte array</em>
<a name="399" href="#399">399</a> <em class="jxr_javadoccomment"> * @return the decoded String, UTF-8 encoded.</em>
<a name="400" href="#400">400</a> <em class="jxr_javadoccomment"> */</em>
<a name="401" href="#401">401</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String decodeToString(byte[] base64Encoded) {
<a name="402" href="#402">402</a> byte[] decoded = decode(base64Encoded);
<a name="403" href="#403">403</a> <strong class="jxr_keyword">return</strong> CodecSupport.toString(decoded);
<a name="404" href="#404">404</a> }
<a name="405" href="#405">405</a>
<a name="406" href="#406">406</a> <em class="jxr_javadoccomment">/**</em>
<a name="407" href="#407">407</a> <em class="jxr_javadoccomment"> * Converts the specified UTF-8 Base64 encoded String and decodes it to a raw Base64 decoded byte array.</em>
<a name="408" href="#408">408</a> <em class="jxr_javadoccomment"> *</em>
<a name="409" href="#409">409</a> <em class="jxr_javadoccomment"> * @param base64Encoded a UTF-8 Base64 encoded String</em>
<a name="410" href="#410">410</a> <em class="jxr_javadoccomment"> * @return the raw Base64 decoded byte array.</em>
<a name="411" href="#411">411</a> <em class="jxr_javadoccomment"> */</em>
<a name="412" href="#412">412</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> byte[] decode(String base64Encoded) {
<a name="413" href="#413">413</a> byte[] bytes = CodecSupport.toBytes(base64Encoded);
<a name="414" href="#414">414</a> <strong class="jxr_keyword">return</strong> decode(bytes);
<a name="415" href="#415">415</a> }
<a name="416" href="#416">416</a>
<a name="417" href="#417">417</a> <em class="jxr_javadoccomment">/**</em>
<a name="418" href="#418">418</a> <em class="jxr_javadoccomment"> * Decodes Base64 data into octects</em>
<a name="419" href="#419">419</a> <em class="jxr_javadoccomment"> *</em>
<a name="420" href="#420">420</a> <em class="jxr_javadoccomment"> * @param base64Data Byte array containing Base64 data</em>
<a name="421" href="#421">421</a> <em class="jxr_javadoccomment"> * @return Array containing decoded data.</em>
<a name="422" href="#422">422</a> <em class="jxr_javadoccomment"> */</em>
<a name="423" href="#423">423</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> byte[] decode(byte[] base64Data) {
<a name="424" href="#424">424</a> <em class="jxr_comment">// RFC 2045 requires that we discard ALL non-Base64 characters</em>
<a name="425" href="#425">425</a> base64Data = discardNonBase64(base64Data);
<a name="426" href="#426">426</a>
<a name="427" href="#427">427</a> <em class="jxr_comment">// handle the edge case, so we don't have to worry about it later</em>
<a name="428" href="#428">428</a> <strong class="jxr_keyword">if</strong> (base64Data.length == 0) {
<a name="429" href="#429">429</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> byte[0];
<a name="430" href="#430">430</a> }
<a name="431" href="#431">431</a>
<a name="432" href="#432">432</a> <strong class="jxr_keyword">int</strong> numberQuadruple = base64Data.length / FOURBYTE;
<a name="433" href="#433">433</a> byte decodedData[];
<a name="434" href="#434">434</a> byte b1, b2, b3, b4, marker0, marker1;
<a name="435" href="#435">435</a>
<a name="436" href="#436">436</a> <em class="jxr_comment">// Throw away anything not in base64Data</em>
<a name="437" href="#437">437</a>
<a name="438" href="#438">438</a> <strong class="jxr_keyword">int</strong> encodedIndex = 0;
<a name="439" href="#439">439</a> <strong class="jxr_keyword">int</strong> dataIndex;
<a name="440" href="#440">440</a> {
<a name="441" href="#441">441</a> <em class="jxr_comment">// this sizes the output array properly - rlw</em>
<a name="442" href="#442">442</a> <strong class="jxr_keyword">int</strong> lastData = base64Data.length;
<a name="443" href="#443">443</a> <em class="jxr_comment">// ignore the '=' padding</em>
<a name="444" href="#444">444</a> <strong class="jxr_keyword">while</strong> (base64Data[lastData - 1] == PAD) {
<a name="445" href="#445">445</a> <strong class="jxr_keyword">if</strong> (--lastData == 0) {
<a name="446" href="#446">446</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> byte[0];
<a name="447" href="#447">447</a> }
<a name="448" href="#448">448</a> }
<a name="449" href="#449">449</a> decodedData = <strong class="jxr_keyword">new</strong> byte[lastData - numberQuadruple];
<a name="450" href="#450">450</a> }
<a name="451" href="#451">451</a>
<a name="452" href="#452">452</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; numberQuadruple; i++) {
<a name="453" href="#453">453</a> dataIndex = i * 4;
<a name="454" href="#454">454</a> marker0 = base64Data[dataIndex + 2];
<a name="455" href="#455">455</a> marker1 = base64Data[dataIndex + 3];
<a name="456" href="#456">456</a>
<a name="457" href="#457">457</a> b1 = base64Alphabet[base64Data[dataIndex]];
<a name="458" href="#458">458</a> b2 = base64Alphabet[base64Data[dataIndex + 1]];
<a name="459" href="#459">459</a>
<a name="460" href="#460">460</a> <strong class="jxr_keyword">if</strong> (marker0 != PAD &amp;&amp; marker1 != PAD) {
<a name="461" href="#461">461</a> <em class="jxr_comment">// No PAD e.g 3cQl</em>
<a name="462" href="#462">462</a> b3 = base64Alphabet[marker0];
<a name="463" href="#463">463</a> b4 = base64Alphabet[marker1];
<a name="464" href="#464">464</a>
<a name="465" href="#465">465</a> decodedData[encodedIndex] = (byte) (b1 &lt;&lt; 2 | b2 &gt;&gt; 4);
<a name="466" href="#466">466</a> decodedData[encodedIndex + 1] = (byte) (((b2 &amp; 0xf) &lt;&lt; 4) | ((b3 &gt;&gt; 2) &amp; 0xf));
<a name="467" href="#467">467</a> decodedData[encodedIndex + 2] = (byte) (b3 &lt;&lt; 6 | b4);
<a name="468" href="#468">468</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (marker0 == PAD) {
<a name="469" href="#469">469</a> <em class="jxr_comment">// Two PAD e.g. 3c[Pad][Pad]</em>
<a name="470" href="#470">470</a> decodedData[encodedIndex] = (byte) (b1 &lt;&lt; 2 | b2 &gt;&gt; 4);
<a name="471" href="#471">471</a> } <strong class="jxr_keyword">else</strong> {
<a name="472" href="#472">472</a> <em class="jxr_comment">// One PAD e.g. 3cQ[Pad]</em>
<a name="473" href="#473">473</a> b3 = base64Alphabet[marker0];
<a name="474" href="#474">474</a> decodedData[encodedIndex] = (byte) (b1 &lt;&lt; 2 | b2 &gt;&gt; 4);
<a name="475" href="#475">475</a> decodedData[encodedIndex + 1] = (byte) (((b2 &amp; 0xf) &lt;&lt; 4) | ((b3 &gt;&gt; 2) &amp; 0xf));
<a name="476" href="#476">476</a> }
<a name="477" href="#477">477</a> encodedIndex += 3;
<a name="478" href="#478">478</a> }
<a name="479" href="#479">479</a> <strong class="jxr_keyword">return</strong> decodedData;
<a name="480" href="#480">480</a> }
<a name="481" href="#481">481</a>
<a name="482" href="#482">482</a> <em class="jxr_javadoccomment">/**</em>
<a name="483" href="#483">483</a> <em class="jxr_javadoccomment"> * Discards any characters outside of the base64 alphabet, per the requirements on page 25 of RFC 2045 - "Any</em>
<a name="484" href="#484">484</a> <em class="jxr_javadoccomment"> * characters outside of the base64 alphabet are to be ignored in base64 encoded data."</em>
<a name="485" href="#485">485</a> <em class="jxr_javadoccomment"> *</em>
<a name="486" href="#486">486</a> <em class="jxr_javadoccomment"> * @param data The base-64 encoded data to groom</em>
<a name="487" href="#487">487</a> <em class="jxr_javadoccomment"> * @return The data, less non-base64 characters (see RFC 2045).</em>
<a name="488" href="#488">488</a> <em class="jxr_javadoccomment"> */</em>
<a name="489" href="#489">489</a> <strong class="jxr_keyword">static</strong> byte[] discardNonBase64(byte[] data) {
<a name="490" href="#490">490</a> byte groomedData[] = <strong class="jxr_keyword">new</strong> byte[data.length];
<a name="491" href="#491">491</a> <strong class="jxr_keyword">int</strong> bytesCopied = 0;
<a name="492" href="#492">492</a>
<a name="493" href="#493">493</a> <strong class="jxr_keyword">for</strong> (byte aByte : data) {
<a name="494" href="#494">494</a> <strong class="jxr_keyword">if</strong> (isBase64(aByte)) {
<a name="495" href="#495">495</a> groomedData[bytesCopied++] = aByte;
<a name="496" href="#496">496</a> }
<a name="497" href="#497">497</a> }
<a name="498" href="#498">498</a>
<a name="499" href="#499">499</a> byte packedData[] = <strong class="jxr_keyword">new</strong> byte[bytesCopied];
<a name="500" href="#500">500</a>
<a name="501" href="#501">501</a> System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);
<a name="502" href="#502">502</a>
<a name="503" href="#503">503</a> <strong class="jxr_keyword">return</strong> packedData;
<a name="504" href="#504">504</a> }
<a name="505" href="#505">505</a>
<a name="506" href="#506">506</a> }
</pre>
<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
</html>