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<FONT color="green">001</FONT> /*<a name="line.1"></a>
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<FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
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<FONT color="green">003</FONT> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a>
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<FONT color="green">004</FONT> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
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<FONT color="green">005</FONT> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
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<FONT color="green">006</FONT> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
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<FONT color="green">007</FONT> * the License. You may obtain a copy of the License at<a name="line.7"></a>
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<FONT color="green">008</FONT> * <a name="line.8"></a>
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<FONT color="green">009</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
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<FONT color="green">010</FONT> * <a name="line.10"></a>
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<FONT color="green">011</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
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<FONT color="green">012</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
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<FONT color="green">013</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
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<FONT color="green">014</FONT> * See the License for the specific language governing permissions and<a name="line.14"></a>
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<FONT color="green">015</FONT> * limitations under the License.<a name="line.15"></a>
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<FONT color="green">016</FONT> */<a name="line.16"></a>
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<FONT color="green">017</FONT> <a name="line.17"></a>
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<FONT color="green">018</FONT> package org.apache.commons.codec.binary;<a name="line.18"></a>
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<FONT color="green">019</FONT> <a name="line.19"></a>
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<FONT color="green">020</FONT> import java.math.BigInteger;<a name="line.20"></a>
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<FONT color="green">021</FONT> <a name="line.21"></a>
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<FONT color="green">022</FONT> import org.apache.commons.codec.BinaryDecoder;<a name="line.22"></a>
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<FONT color="green">023</FONT> import org.apache.commons.codec.BinaryEncoder;<a name="line.23"></a>
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<FONT color="green">024</FONT> import org.apache.commons.codec.DecoderException;<a name="line.24"></a>
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<FONT color="green">025</FONT> import org.apache.commons.codec.EncoderException;<a name="line.25"></a>
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<FONT color="green">026</FONT> <a name="line.26"></a>
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<FONT color="green">027</FONT> /**<a name="line.27"></a>
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<FONT color="green">028</FONT> * Provides Base64 encoding and decoding as defined by RFC 2045.<a name="line.28"></a>
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<FONT color="green">029</FONT> * <a name="line.29"></a>
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<FONT color="green">030</FONT> * <p><a name="line.30"></a>
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<FONT color="green">031</FONT> * This class implements section <cite>6.8. Base64 Content-Transfer-Encoding</cite> from RFC 2045 <cite>Multipurpose<a name="line.31"></a>
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<FONT color="green">032</FONT> * Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies</cite> by Freed and Borenstein.<a name="line.32"></a>
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<FONT color="green">033</FONT> * </p><a name="line.33"></a>
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<FONT color="green">034</FONT> * <p><a name="line.34"></a>
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<FONT color="green">035</FONT> * The class can be parameterized in the following manner with various constructors:<a name="line.35"></a>
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<FONT color="green">036</FONT> * <ul><a name="line.36"></a>
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<FONT color="green">037</FONT> * <li>URL-safe mode: Default off.</li><a name="line.37"></a>
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<FONT color="green">038</FONT> * <li>Line length: Default 76. Line length that aren't multiples of 4 will still essentially end up being multiples of<a name="line.38"></a>
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<FONT color="green">039</FONT> * 4 in the encoded data.<a name="line.39"></a>
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<FONT color="green">040</FONT> * <li>Line separator: Default is CRLF ("\r\n")</li><a name="line.40"></a>
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<FONT color="green">041</FONT> * </ul><a name="line.41"></a>
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<FONT color="green">042</FONT> * </p><a name="line.42"></a>
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<FONT color="green">043</FONT> * <p><a name="line.43"></a>
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<FONT color="green">044</FONT> * Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode<a name="line.44"></a>
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<FONT color="green">045</FONT> * character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc).<a name="line.45"></a>
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<FONT color="green">046</FONT> * </p><a name="line.46"></a>
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<FONT color="green">047</FONT> * <a name="line.47"></a>
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<FONT color="green">048</FONT> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a><a name="line.48"></a>
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<FONT color="green">049</FONT> * @author Apache Software Foundation<a name="line.49"></a>
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<FONT color="green">050</FONT> * @since 1.0<a name="line.50"></a>
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<FONT color="green">051</FONT> * @version $Id: Base64.java 801706 2009-08-06 16:27:06Z niallp $<a name="line.51"></a>
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<FONT color="green">052</FONT> */<a name="line.52"></a>
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<FONT color="green">053</FONT> public class Base64 implements BinaryEncoder, BinaryDecoder {<a name="line.53"></a>
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<FONT color="green">054</FONT> private static final int DEFAULT_BUFFER_RESIZE_FACTOR = 2;<a name="line.54"></a>
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<FONT color="green">055</FONT> <a name="line.55"></a>
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<FONT color="green">056</FONT> private static final int DEFAULT_BUFFER_SIZE = 8192;<a name="line.56"></a>
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<FONT color="green">057</FONT> <a name="line.57"></a>
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<FONT color="green">058</FONT> /**<a name="line.58"></a>
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<FONT color="green">059</FONT> * Chunk size per RFC 2045 section 6.8.<a name="line.59"></a>
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<FONT color="green">060</FONT> * <a name="line.60"></a>
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<FONT color="green">061</FONT> * <p><a name="line.61"></a>
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<FONT color="green">062</FONT> * The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any<a name="line.62"></a>
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<FONT color="green">063</FONT> * equal signs.<a name="line.63"></a>
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<FONT color="green">064</FONT> * </p><a name="line.64"></a>
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<FONT color="green">065</FONT> * <a name="line.65"></a>
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<FONT color="green">066</FONT> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a><a name="line.66"></a>
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<FONT color="green">067</FONT> */<a name="line.67"></a>
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<FONT color="green">068</FONT> static final int CHUNK_SIZE = 76;<a name="line.68"></a>
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<FONT color="green">069</FONT> <a name="line.69"></a>
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<FONT color="green">070</FONT> /**<a name="line.70"></a>
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<FONT color="green">071</FONT> * Chunk separator per RFC 2045 section 2.1.<a name="line.71"></a>
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<FONT color="green">072</FONT> *<a name="line.72"></a>
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<FONT color="green">073</FONT> * <p><a name="line.73"></a>
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<FONT color="green">074</FONT> * N.B. The next major release may break compatibility and make this field private.<a name="line.74"></a>
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<FONT color="green">075</FONT> * </p><a name="line.75"></a>
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<FONT color="green">076</FONT> * <a name="line.76"></a>
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<FONT color="green">077</FONT> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a><a name="line.77"></a>
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<FONT color="green">078</FONT> */<a name="line.78"></a>
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<FONT color="green">079</FONT> static final byte[] CHUNK_SEPARATOR = {'\r', '\n'};<a name="line.79"></a>
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<FONT color="green">080</FONT> <a name="line.80"></a>
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<FONT color="green">081</FONT> /**<a name="line.81"></a>
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<FONT color="green">082</FONT> * This array is a lookup table that translates 6-bit positive integer index values into their "Base64 Alphabet"<a name="line.82"></a>
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<FONT color="green">083</FONT> * equivalents as specified in Table 1 of RFC 2045.<a name="line.83"></a>
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<FONT color="green">084</FONT> * <a name="line.84"></a>
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<FONT color="green">085</FONT> * Thanks to "commons" project in ws.apache.org for this code.<a name="line.85"></a>
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<FONT color="green">086</FONT> * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/<a name="line.86"></a>
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<FONT color="green">087</FONT> */<a name="line.87"></a>
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<FONT color="green">088</FONT> private static final byte[] STANDARD_ENCODE_TABLE = {<a name="line.88"></a>
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<FONT color="green">089</FONT> 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',<a name="line.89"></a>
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<FONT color="green">090</FONT> 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',<a name="line.90"></a>
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<FONT color="green">091</FONT> 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',<a name="line.91"></a>
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<FONT color="green">092</FONT> 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',<a name="line.92"></a>
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<FONT color="green">093</FONT> '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'<a name="line.93"></a>
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<FONT color="green">094</FONT> };<a name="line.94"></a>
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<FONT color="green">095</FONT> <a name="line.95"></a>
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<FONT color="green">096</FONT> /**<a name="line.96"></a>
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<FONT color="green">097</FONT> * This is a copy of the STANDARD_ENCODE_TABLE above, but with + and /<a name="line.97"></a>
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<FONT color="green">098</FONT> * changed to - and _ to make the encoded Base64 results more URL-SAFE.<a name="line.98"></a>
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<FONT color="green">099</FONT> * This table is only used when the Base64's mode is set to URL-SAFE.<a name="line.99"></a>
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<FONT color="green">100</FONT> */ <a name="line.100"></a>
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<FONT color="green">101</FONT> private static final byte[] URL_SAFE_ENCODE_TABLE = {<a name="line.101"></a>
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<FONT color="green">102</FONT> 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',<a name="line.102"></a>
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<FONT color="green">103</FONT> 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',<a name="line.103"></a>
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<FONT color="green">104</FONT> 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',<a name="line.104"></a>
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<FONT color="green">105</FONT> 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',<a name="line.105"></a>
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<FONT color="green">106</FONT> '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'<a name="line.106"></a>
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<FONT color="green">107</FONT> };<a name="line.107"></a>
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<FONT color="green">108</FONT> <a name="line.108"></a>
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<FONT color="green">109</FONT> /**<a name="line.109"></a>
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<FONT color="green">110</FONT> * Byte used to pad output.<a name="line.110"></a>
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<FONT color="green">111</FONT> */<a name="line.111"></a>
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<FONT color="green">112</FONT> private static final byte PAD = '=';<a name="line.112"></a>
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<FONT color="green">113</FONT> <a name="line.113"></a>
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<FONT color="green">114</FONT> /**<a name="line.114"></a>
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<FONT color="green">115</FONT> * This array is a lookup table that translates Unicode characters drawn from the "Base64 Alphabet" (as specified in<a name="line.115"></a>
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<FONT color="green">116</FONT> * Table 1 of RFC 2045) into their 6-bit positive integer equivalents. Characters that are not in the Base64<a name="line.116"></a>
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<FONT color="green">117</FONT> * alphabet but fall within the bounds of the array are translated to -1.<a name="line.117"></a>
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<FONT color="green">118</FONT> * <a name="line.118"></a>
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<FONT color="green">119</FONT> * Note: '+' and '-' both decode to 62. '/' and '_' both decode to 63. This means decoder seamlessly handles both<a name="line.119"></a>
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<FONT color="green">120</FONT> * URL_SAFE and STANDARD base64. (The encoder, on the other hand, needs to know ahead of time what to emit).<a name="line.120"></a>
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<FONT color="green">121</FONT> * <a name="line.121"></a>
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<FONT color="green">122</FONT> * Thanks to "commons" project in ws.apache.org for this code.<a name="line.122"></a>
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<FONT color="green">123</FONT> * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/<a name="line.123"></a>
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<FONT color="green">124</FONT> */<a name="line.124"></a>
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<FONT color="green">125</FONT> private static final byte[] DECODE_TABLE = {<a name="line.125"></a>
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<FONT color="green">126</FONT> -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,<a name="line.126"></a>
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<FONT color="green">127</FONT> -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,<a name="line.127"></a>
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<FONT color="green">128</FONT> -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 62, -1, 63, 52, 53, 54,<a name="line.128"></a>
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<FONT color="green">129</FONT> 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4,<a name="line.129"></a>
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<FONT color="green">130</FONT> 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,<a name="line.130"></a>
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<FONT color="green">131</FONT> 24, 25, -1, -1, -1, -1, 63, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34,<a name="line.131"></a>
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<FONT color="green">132</FONT> 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51<a name="line.132"></a>
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<FONT color="green">133</FONT> };<a name="line.133"></a>
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<FONT color="green">134</FONT> <a name="line.134"></a>
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<FONT color="green">135</FONT> /** Mask used to extract 6 bits, used when encoding */<a name="line.135"></a>
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<FONT color="green">136</FONT> private static final int MASK_6BITS = 0x3f;<a name="line.136"></a>
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<FONT color="green">137</FONT> <a name="line.137"></a>
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<FONT color="green">138</FONT> /** Mask used to extract 8 bits, used in decoding base64 bytes */<a name="line.138"></a>
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<FONT color="green">139</FONT> private static final int MASK_8BITS = 0xff;<a name="line.139"></a>
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<FONT color="green">140</FONT> <a name="line.140"></a>
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<FONT color="green">141</FONT> // The static final fields above are used for the original static byte[] methods on Base64.<a name="line.141"></a>
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<FONT color="green">142</FONT> // The private member fields below are used with the new streaming approach, which requires<a name="line.142"></a>
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<FONT color="green">143</FONT> // some state be preserved between calls of encode() and decode().<a name="line.143"></a>
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<FONT color="green">144</FONT> <a name="line.144"></a>
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<FONT color="green">145</FONT> /**<a name="line.145"></a>
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<FONT color="green">146</FONT> * Encode table to use: either STANDARD or URL_SAFE. Note: the DECODE_TABLE above remains static because it is able<a name="line.146"></a>
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<FONT color="green">147</FONT> * to decode both STANDARD and URL_SAFE streams, but the encodeTable must be a member variable so we can switch<a name="line.147"></a>
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<FONT color="green">148</FONT> * between the two modes.<a name="line.148"></a>
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<FONT color="green">149</FONT> */<a name="line.149"></a>
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<FONT color="green">150</FONT> private final byte[] encodeTable;<a name="line.150"></a>
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<FONT color="green">151</FONT> <a name="line.151"></a>
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<FONT color="green">152</FONT> /**<a name="line.152"></a>
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<FONT color="green">153</FONT> * Line length for encoding. Not used when decoding. A value of zero or less implies no chunking of the base64<a name="line.153"></a>
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<FONT color="green">154</FONT> * encoded data.<a name="line.154"></a>
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<FONT color="green">155</FONT> */<a name="line.155"></a>
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<FONT color="green">156</FONT> private final int lineLength;<a name="line.156"></a>
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<FONT color="green">157</FONT> <a name="line.157"></a>
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<FONT color="green">158</FONT> /**<a name="line.158"></a>
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<FONT color="green">159</FONT> * Line separator for encoding. Not used when decoding. Only used if lineLength > 0.<a name="line.159"></a>
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<FONT color="green">160</FONT> */<a name="line.160"></a>
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<FONT color="green">161</FONT> private final byte[] lineSeparator;<a name="line.161"></a>
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<FONT color="green">162</FONT> <a name="line.162"></a>
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<FONT color="green">163</FONT> /**<a name="line.163"></a>
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<FONT color="green">164</FONT> * Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.<a name="line.164"></a>
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<FONT color="green">165</FONT> * <code>decodeSize = 3 + lineSeparator.length;</code><a name="line.165"></a>
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<FONT color="green">166</FONT> */<a name="line.166"></a>
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<FONT color="green">167</FONT> private final int decodeSize;<a name="line.167"></a>
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<FONT color="green">168</FONT> <a name="line.168"></a>
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<FONT color="green">169</FONT> /**<a name="line.169"></a>
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<FONT color="green">170</FONT> * Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.<a name="line.170"></a>
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<FONT color="green">171</FONT> * <code>encodeSize = 4 + lineSeparator.length;</code><a name="line.171"></a>
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<FONT color="green">172</FONT> */<a name="line.172"></a>
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<FONT color="green">173</FONT> private final int encodeSize;<a name="line.173"></a>
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<FONT color="green">174</FONT> <a name="line.174"></a>
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<FONT color="green">175</FONT> /**<a name="line.175"></a>
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<FONT color="green">176</FONT> * Buffer for streaming.<a name="line.176"></a>
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<FONT color="green">177</FONT> */<a name="line.177"></a>
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<FONT color="green">178</FONT> private byte[] buffer;<a name="line.178"></a>
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<FONT color="green">179</FONT> <a name="line.179"></a>
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<FONT color="green">180</FONT> /**<a name="line.180"></a>
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<FONT color="green">181</FONT> * Position where next character should be written in the buffer.<a name="line.181"></a>
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<FONT color="green">182</FONT> */<a name="line.182"></a>
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<FONT color="green">183</FONT> private int pos;<a name="line.183"></a>
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<FONT color="green">184</FONT> <a name="line.184"></a>
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<FONT color="green">185</FONT> /**<a name="line.185"></a>
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<FONT color="green">186</FONT> * Position where next character should be read from the buffer.<a name="line.186"></a>
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<FONT color="green">187</FONT> */<a name="line.187"></a>
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<FONT color="green">188</FONT> private int readPos;<a name="line.188"></a>
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<FONT color="green">189</FONT> <a name="line.189"></a>
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<FONT color="green">190</FONT> /**<a name="line.190"></a>
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<FONT color="green">191</FONT> * Variable tracks how many characters have been written to the current line. Only used when encoding. We use it to<a name="line.191"></a>
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<FONT color="green">192</FONT> * make sure each encoded line never goes beyond lineLength (if lineLength > 0).<a name="line.192"></a>
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<FONT color="green">193</FONT> */<a name="line.193"></a>
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<FONT color="green">194</FONT> private int currentLinePos;<a name="line.194"></a>
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<FONT color="green">195</FONT> <a name="line.195"></a>
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<FONT color="green">196</FONT> /**<a name="line.196"></a>
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<FONT color="green">197</FONT> * Writes to the buffer only occur after every 3 reads when encoding, an every 4 reads when decoding. This variable<a name="line.197"></a>
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<FONT color="green">198</FONT> * helps track that.<a name="line.198"></a>
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<FONT color="green">199</FONT> */<a name="line.199"></a>
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<FONT color="green">200</FONT> private int modulus;<a name="line.200"></a>
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<FONT color="green">201</FONT> <a name="line.201"></a>
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<FONT color="green">202</FONT> /**<a name="line.202"></a>
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<FONT color="green">203</FONT> * Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this Base64 object becomes useless,<a name="line.203"></a>
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<FONT color="green">204</FONT> * and must be thrown away.<a name="line.204"></a>
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<FONT color="green">205</FONT> */<a name="line.205"></a>
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<FONT color="green">206</FONT> private boolean eof;<a name="line.206"></a>
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<FONT color="green">207</FONT> <a name="line.207"></a>
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<FONT color="green">208</FONT> /**<a name="line.208"></a>
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<FONT color="green">209</FONT> * Place holder for the 3 bytes we're dealing with for our base64 logic. Bitwise operations store and extract the<a name="line.209"></a>
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<FONT color="green">210</FONT> * base64 encoding or decoding from this variable.<a name="line.210"></a>
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<FONT color="green">211</FONT> */<a name="line.211"></a>
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<FONT color="green">212</FONT> private int x;<a name="line.212"></a>
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<FONT color="green">213</FONT> <a name="line.213"></a>
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<FONT color="green">214</FONT> /**<a name="line.214"></a>
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<FONT color="green">215</FONT> * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.<a name="line.215"></a>
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<FONT color="green">216</FONT> * <p><a name="line.216"></a>
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<FONT color="green">217</FONT> * When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.<a name="line.217"></a>
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<FONT color="green">218</FONT> * </p><a name="line.218"></a>
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<FONT color="green">219</FONT> * <a name="line.219"></a>
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<FONT color="green">220</FONT> * <p><a name="line.220"></a>
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<FONT color="green">221</FONT> * When decoding all variants are supported.<a name="line.221"></a>
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<FONT color="green">222</FONT> * </p><a name="line.222"></a>
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<FONT color="green">223</FONT> */<a name="line.223"></a>
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<FONT color="green">224</FONT> public Base64() {<a name="line.224"></a>
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<FONT color="green">225</FONT> this(false);<a name="line.225"></a>
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<FONT color="green">226</FONT> }<a name="line.226"></a>
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<FONT color="green">227</FONT> <a name="line.227"></a>
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<FONT color="green">228</FONT> /**<a name="line.228"></a>
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<FONT color="green">229</FONT> * Creates a Base64 codec used for decoding (all modes) and encoding in the given URL-safe mode.<a name="line.229"></a>
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<FONT color="green">230</FONT> * <p><a name="line.230"></a>
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<FONT color="green">231</FONT> * When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.<a name="line.231"></a>
235
<FONT color="green">232</FONT> * </p><a name="line.232"></a>
236
<FONT color="green">233</FONT> * <a name="line.233"></a>
237
<FONT color="green">234</FONT> * <p><a name="line.234"></a>
238
<FONT color="green">235</FONT> * When decoding all variants are supported.<a name="line.235"></a>
239
<FONT color="green">236</FONT> * </p><a name="line.236"></a>
240
<FONT color="green">237</FONT> * <a name="line.237"></a>
241
<FONT color="green">238</FONT> * @param urlSafe<a name="line.238"></a>
242
<FONT color="green">239</FONT> * if <code>true</code>, URL-safe encoding is used. In most cases this should be set to<a name="line.239"></a>
243
<FONT color="green">240</FONT> * <code>false</code>.<a name="line.240"></a>
244
<FONT color="green">241</FONT> * @since 1.4<a name="line.241"></a>
245
<FONT color="green">242</FONT> */<a name="line.242"></a>
246
<FONT color="green">243</FONT> public Base64(boolean urlSafe) {<a name="line.243"></a>
247
<FONT color="green">244</FONT> this(CHUNK_SIZE, CHUNK_SEPARATOR, urlSafe);<a name="line.244"></a>
248
<FONT color="green">245</FONT> }<a name="line.245"></a>
249
<FONT color="green">246</FONT> <a name="line.246"></a>
250
<FONT color="green">247</FONT> /**<a name="line.247"></a>
251
<FONT color="green">248</FONT> * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.<a name="line.248"></a>
252
<FONT color="green">249</FONT> * <p><a name="line.249"></a>
253
<FONT color="green">250</FONT> * When encoding the line length is given in the constructor, the line separator is CRLF, and the encoding table is<a name="line.250"></a>
254
<FONT color="green">251</FONT> * STANDARD_ENCODE_TABLE.<a name="line.251"></a>
255
<FONT color="green">252</FONT> * </p><a name="line.252"></a>
256
<FONT color="green">253</FONT> * <p><a name="line.253"></a>
257
<FONT color="green">254</FONT> * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.<a name="line.254"></a>
258
<FONT color="green">255</FONT> * </p><a name="line.255"></a>
259
<FONT color="green">256</FONT> * <p><a name="line.256"></a>
260
<FONT color="green">257</FONT> * When decoding all variants are supported.<a name="line.257"></a>
261
<FONT color="green">258</FONT> * </p><a name="line.258"></a>
262
<FONT color="green">259</FONT> * <a name="line.259"></a>
263
<FONT color="green">260</FONT> * @param lineLength<a name="line.260"></a>
264
<FONT color="green">261</FONT> * Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).<a name="line.261"></a>
265
<FONT color="green">262</FONT> * If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.<a name="line.262"></a>
266
<FONT color="green">263</FONT> * @since 1.4<a name="line.263"></a>
267
<FONT color="green">264</FONT> */<a name="line.264"></a>
268
<FONT color="green">265</FONT> public Base64(int lineLength) {<a name="line.265"></a>
269
<FONT color="green">266</FONT> this(lineLength, CHUNK_SEPARATOR);<a name="line.266"></a>
270
<FONT color="green">267</FONT> }<a name="line.267"></a>
271
<FONT color="green">268</FONT> <a name="line.268"></a>
272
<FONT color="green">269</FONT> /**<a name="line.269"></a>
273
<FONT color="green">270</FONT> * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.<a name="line.270"></a>
274
<FONT color="green">271</FONT> * <p><a name="line.271"></a>
275
<FONT color="green">272</FONT> * When encoding the line length and line separator are given in the constructor, and the encoding table is<a name="line.272"></a>
276
<FONT color="green">273</FONT> * STANDARD_ENCODE_TABLE.<a name="line.273"></a>
277
<FONT color="green">274</FONT> * </p><a name="line.274"></a>
278
<FONT color="green">275</FONT> * <p><a name="line.275"></a>
279
<FONT color="green">276</FONT> * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.<a name="line.276"></a>
280
<FONT color="green">277</FONT> * </p><a name="line.277"></a>
281
<FONT color="green">278</FONT> * <p><a name="line.278"></a>
282
<FONT color="green">279</FONT> * When decoding all variants are supported.<a name="line.279"></a>
283
<FONT color="green">280</FONT> * </p><a name="line.280"></a>
284
<FONT color="green">281</FONT> * <a name="line.281"></a>
285
<FONT color="green">282</FONT> * @param lineLength<a name="line.282"></a>
286
<FONT color="green">283</FONT> * Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).<a name="line.283"></a>
287
<FONT color="green">284</FONT> * If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.<a name="line.284"></a>
288
<FONT color="green">285</FONT> * @param lineSeparator<a name="line.285"></a>
289
<FONT color="green">286</FONT> * Each line of encoded data will end with this sequence of bytes.<a name="line.286"></a>
290
<FONT color="green">287</FONT> * @throws IllegalArgumentException<a name="line.287"></a>
291
<FONT color="green">288</FONT> * Thrown when the provided lineSeparator included some base64 characters.<a name="line.288"></a>
292
<FONT color="green">289</FONT> * @since 1.4<a name="line.289"></a>
293
<FONT color="green">290</FONT> */<a name="line.290"></a>
294
<FONT color="green">291</FONT> public Base64(int lineLength, byte[] lineSeparator) {<a name="line.291"></a>
295
<FONT color="green">292</FONT> this(lineLength, lineSeparator, false);<a name="line.292"></a>
296
<FONT color="green">293</FONT> }<a name="line.293"></a>
297
<FONT color="green">294</FONT> <a name="line.294"></a>
298
<FONT color="green">295</FONT> /**<a name="line.295"></a>
299
<FONT color="green">296</FONT> * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.<a name="line.296"></a>
300
<FONT color="green">297</FONT> * <p><a name="line.297"></a>
301
<FONT color="green">298</FONT> * When encoding the line length and line separator are given in the constructor, and the encoding table is<a name="line.298"></a>
302
<FONT color="green">299</FONT> * STANDARD_ENCODE_TABLE.<a name="line.299"></a>
303
<FONT color="green">300</FONT> * </p><a name="line.300"></a>
304
<FONT color="green">301</FONT> * <p><a name="line.301"></a>
305
<FONT color="green">302</FONT> * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.<a name="line.302"></a>
306
<FONT color="green">303</FONT> * </p><a name="line.303"></a>
307
<FONT color="green">304</FONT> * <p><a name="line.304"></a>
308
<FONT color="green">305</FONT> * When decoding all variants are supported.<a name="line.305"></a>
309
<FONT color="green">306</FONT> * </p><a name="line.306"></a>
310
<FONT color="green">307</FONT> * <a name="line.307"></a>
311
<FONT color="green">308</FONT> * @param lineLength<a name="line.308"></a>
312
<FONT color="green">309</FONT> * Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).<a name="line.309"></a>
313
<FONT color="green">310</FONT> * If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.<a name="line.310"></a>
314
<FONT color="green">311</FONT> * @param lineSeparator<a name="line.311"></a>
315
<FONT color="green">312</FONT> * Each line of encoded data will end with this sequence of bytes.<a name="line.312"></a>
316
<FONT color="green">313</FONT> * @param urlSafe<a name="line.313"></a>
317
<FONT color="green">314</FONT> * Instead of emitting '+' and '/' we emit '-' and '_' respectively. urlSafe is only applied to encode<a name="line.314"></a>
318
<FONT color="green">315</FONT> * operations. Decoding seamlessly handles both modes.<a name="line.315"></a>
319
<FONT color="green">316</FONT> * @throws IllegalArgumentException<a name="line.316"></a>
320
<FONT color="green">317</FONT> * The provided lineSeparator included some base64 characters. That's not going to work!<a name="line.317"></a>
321
<FONT color="green">318</FONT> * @since 1.4<a name="line.318"></a>
322
<FONT color="green">319</FONT> */<a name="line.319"></a>
323
<FONT color="green">320</FONT> public Base64(int lineLength, byte[] lineSeparator, boolean urlSafe) {<a name="line.320"></a>
324
<FONT color="green">321</FONT> if (lineSeparator == null) {<a name="line.321"></a>
325
<FONT color="green">322</FONT> lineLength = 0; // disable chunk-separating<a name="line.322"></a>
326
<FONT color="green">323</FONT> lineSeparator = CHUNK_SEPARATOR; // this just gets ignored<a name="line.323"></a>
327
<FONT color="green">324</FONT> }<a name="line.324"></a>
328
<FONT color="green">325</FONT> this.lineLength = lineLength > 0 ? (lineLength / 4) * 4 : 0;<a name="line.325"></a>
329
<FONT color="green">326</FONT> this.lineSeparator = new byte[lineSeparator.length];<a name="line.326"></a>
330
<FONT color="green">327</FONT> System.arraycopy(lineSeparator, 0, this.lineSeparator, 0, lineSeparator.length);<a name="line.327"></a>
331
<FONT color="green">328</FONT> if (lineLength > 0) {<a name="line.328"></a>
332
<FONT color="green">329</FONT> this.encodeSize = 4 + lineSeparator.length;<a name="line.329"></a>
333
<FONT color="green">330</FONT> } else {<a name="line.330"></a>
334
<FONT color="green">331</FONT> this.encodeSize = 4;<a name="line.331"></a>
335
<FONT color="green">332</FONT> }<a name="line.332"></a>
336
<FONT color="green">333</FONT> this.decodeSize = this.encodeSize - 1;<a name="line.333"></a>
337
<FONT color="green">334</FONT> if (containsBase64Byte(lineSeparator)) {<a name="line.334"></a>
338
<FONT color="green">335</FONT> String sep = StringUtils.newStringUtf8(lineSeparator);<a name="line.335"></a>
339
<FONT color="green">336</FONT> throw new IllegalArgumentException("lineSeperator must not contain base64 characters: [" + sep + "]");<a name="line.336"></a>
340
<FONT color="green">337</FONT> }<a name="line.337"></a>
341
<FONT color="green">338</FONT> this.encodeTable = urlSafe ? URL_SAFE_ENCODE_TABLE : STANDARD_ENCODE_TABLE;<a name="line.338"></a>
342
<FONT color="green">339</FONT> }<a name="line.339"></a>
343
<FONT color="green">340</FONT> <a name="line.340"></a>
344
<FONT color="green">341</FONT> /**<a name="line.341"></a>
345
<FONT color="green">342</FONT> * Returns our current encode mode. True if we're URL-SAFE, false otherwise.<a name="line.342"></a>
346
<FONT color="green">343</FONT> * <a name="line.343"></a>
347
<FONT color="green">344</FONT> * @return true if we're in URL-SAFE mode, false otherwise.<a name="line.344"></a>
348
<FONT color="green">345</FONT> * @since 1.4<a name="line.345"></a>
349
<FONT color="green">346</FONT> */<a name="line.346"></a>
350
<FONT color="green">347</FONT> public boolean isUrlSafe() {<a name="line.347"></a>
351
<FONT color="green">348</FONT> return this.encodeTable == URL_SAFE_ENCODE_TABLE;<a name="line.348"></a>
352
<FONT color="green">349</FONT> }<a name="line.349"></a>
353
<FONT color="green">350</FONT> <a name="line.350"></a>
354
<FONT color="green">351</FONT> /**<a name="line.351"></a>
355
<FONT color="green">352</FONT> * Returns true if this Base64 object has buffered data for reading.<a name="line.352"></a>
356
<FONT color="green">353</FONT> * <a name="line.353"></a>
357
<FONT color="green">354</FONT> * @return true if there is Base64 object still available for reading.<a name="line.354"></a>
358
<FONT color="green">355</FONT> */<a name="line.355"></a>
359
<FONT color="green">356</FONT> boolean hasData() {<a name="line.356"></a>
360
<FONT color="green">357</FONT> return this.buffer != null;<a name="line.357"></a>
361
<FONT color="green">358</FONT> }<a name="line.358"></a>
362
<FONT color="green">359</FONT> <a name="line.359"></a>
363
<FONT color="green">360</FONT> /**<a name="line.360"></a>
364
<FONT color="green">361</FONT> * Returns the amount of buffered data available for reading.<a name="line.361"></a>
365
<FONT color="green">362</FONT> * <a name="line.362"></a>
366
<FONT color="green">363</FONT> * @return The amount of buffered data available for reading.<a name="line.363"></a>
367
<FONT color="green">364</FONT> */<a name="line.364"></a>
368
<FONT color="green">365</FONT> int avail() {<a name="line.365"></a>
369
<FONT color="green">366</FONT> return buffer != null ? pos - readPos : 0;<a name="line.366"></a>
370
<FONT color="green">367</FONT> }<a name="line.367"></a>
371
<FONT color="green">368</FONT> <a name="line.368"></a>
372
<FONT color="green">369</FONT> /** Doubles our buffer. */<a name="line.369"></a>
373
<FONT color="green">370</FONT> private void resizeBuffer() {<a name="line.370"></a>
374
<FONT color="green">371</FONT> if (buffer == null) {<a name="line.371"></a>
375
<FONT color="green">372</FONT> buffer = new byte[DEFAULT_BUFFER_SIZE];<a name="line.372"></a>
376
<FONT color="green">373</FONT> pos = 0;<a name="line.373"></a>
377
<FONT color="green">374</FONT> readPos = 0;<a name="line.374"></a>
378
<FONT color="green">375</FONT> } else {<a name="line.375"></a>
379
<FONT color="green">376</FONT> byte[] b = new byte[buffer.length * DEFAULT_BUFFER_RESIZE_FACTOR];<a name="line.376"></a>
380
<FONT color="green">377</FONT> System.arraycopy(buffer, 0, b, 0, buffer.length);<a name="line.377"></a>
381
<FONT color="green">378</FONT> buffer = b;<a name="line.378"></a>
382
<FONT color="green">379</FONT> }<a name="line.379"></a>
383
<FONT color="green">380</FONT> }<a name="line.380"></a>
384
<FONT color="green">381</FONT> <a name="line.381"></a>
385
<FONT color="green">382</FONT> /**<a name="line.382"></a>
386
<FONT color="green">383</FONT> * Extracts buffered data into the provided byte[] array, starting at position bPos, up to a maximum of bAvail<a name="line.383"></a>
387
<FONT color="green">384</FONT> * bytes. Returns how many bytes were actually extracted.<a name="line.384"></a>
388
<FONT color="green">385</FONT> * <a name="line.385"></a>
389
<FONT color="green">386</FONT> * @param b<a name="line.386"></a>
390
<FONT color="green">387</FONT> * byte[] array to extract the buffered data into.<a name="line.387"></a>
391
<FONT color="green">388</FONT> * @param bPos<a name="line.388"></a>
392
<FONT color="green">389</FONT> * position in byte[] array to start extraction at.<a name="line.389"></a>
393
<FONT color="green">390</FONT> * @param bAvail<a name="line.390"></a>
394
<FONT color="green">391</FONT> * amount of bytes we're allowed to extract. We may extract fewer (if fewer are available).<a name="line.391"></a>
395
<FONT color="green">392</FONT> * @return The number of bytes successfully extracted into the provided byte[] array.<a name="line.392"></a>
396
<FONT color="green">393</FONT> */<a name="line.393"></a>
397
<FONT color="green">394</FONT> int readResults(byte[] b, int bPos, int bAvail) {<a name="line.394"></a>
398
<FONT color="green">395</FONT> if (buffer != null) {<a name="line.395"></a>
399
<FONT color="green">396</FONT> int len = Math.min(avail(), bAvail);<a name="line.396"></a>
400
<FONT color="green">397</FONT> if (buffer != b) {<a name="line.397"></a>
401
<FONT color="green">398</FONT> System.arraycopy(buffer, readPos, b, bPos, len);<a name="line.398"></a>
402
<FONT color="green">399</FONT> readPos += len;<a name="line.399"></a>
403
<FONT color="green">400</FONT> if (readPos >= pos) {<a name="line.400"></a>
404
<FONT color="green">401</FONT> buffer = null;<a name="line.401"></a>
405
<FONT color="green">402</FONT> }<a name="line.402"></a>
406
<FONT color="green">403</FONT> } else {<a name="line.403"></a>
407
<FONT color="green">404</FONT> // Re-using the original consumer's output array is only<a name="line.404"></a>
408
<FONT color="green">405</FONT> // allowed for one round.<a name="line.405"></a>
409
<FONT color="green">406</FONT> buffer = null;<a name="line.406"></a>
410
<FONT color="green">407</FONT> }<a name="line.407"></a>
411
<FONT color="green">408</FONT> return len;<a name="line.408"></a>
412
<FONT color="green">409</FONT> }<a name="line.409"></a>
413
<FONT color="green">410</FONT> return eof ? -1 : 0;<a name="line.410"></a>
414
<FONT color="green">411</FONT> }<a name="line.411"></a>
415
<FONT color="green">412</FONT> <a name="line.412"></a>
416
<FONT color="green">413</FONT> /**<a name="line.413"></a>
417
<FONT color="green">414</FONT> * Sets the streaming buffer. This is a small optimization where we try to buffer directly to the consumer's output<a name="line.414"></a>
418
<FONT color="green">415</FONT> * array for one round (if the consumer calls this method first) instead of starting our own buffer.<a name="line.415"></a>
419
<FONT color="green">416</FONT> * <a name="line.416"></a>
420
<FONT color="green">417</FONT> * @param out<a name="line.417"></a>
421
<FONT color="green">418</FONT> * byte[] array to buffer directly to.<a name="line.418"></a>
422
<FONT color="green">419</FONT> * @param outPos<a name="line.419"></a>
423
<FONT color="green">420</FONT> * Position to start buffering into.<a name="line.420"></a>
424
<FONT color="green">421</FONT> * @param outAvail<a name="line.421"></a>
425
<FONT color="green">422</FONT> * Amount of bytes available for direct buffering.<a name="line.422"></a>
426
<FONT color="green">423</FONT> */<a name="line.423"></a>
427
<FONT color="green">424</FONT> void setInitialBuffer(byte[] out, int outPos, int outAvail) {<a name="line.424"></a>
428
<FONT color="green">425</FONT> // We can re-use consumer's original output array under<a name="line.425"></a>
429
<FONT color="green">426</FONT> // special circumstances, saving on some System.arraycopy().<a name="line.426"></a>
430
<FONT color="green">427</FONT> if (out != null && out.length == outAvail) {<a name="line.427"></a>
431
<FONT color="green">428</FONT> buffer = out;<a name="line.428"></a>
432
<FONT color="green">429</FONT> pos = outPos;<a name="line.429"></a>
433
<FONT color="green">430</FONT> readPos = outPos;<a name="line.430"></a>
434
<FONT color="green">431</FONT> }<a name="line.431"></a>
435
<FONT color="green">432</FONT> }<a name="line.432"></a>
436
<FONT color="green">433</FONT> <a name="line.433"></a>
437
<FONT color="green">434</FONT> /**<a name="line.434"></a>
438
<FONT color="green">435</FONT> * <p><a name="line.435"></a>
439
<FONT color="green">436</FONT> * Encodes all of the provided data, starting at inPos, for inAvail bytes. Must be called at least twice: once with<a name="line.436"></a>
440
<FONT color="green">437</FONT> * the data to encode, and once with inAvail set to "-1" to alert encoder that EOF has been reached, so flush last<a name="line.437"></a>
441
<FONT color="green">438</FONT> * remaining bytes (if not multiple of 3).<a name="line.438"></a>
442
<FONT color="green">439</FONT> * </p><a name="line.439"></a>
443
<FONT color="green">440</FONT> * <p><a name="line.440"></a>
444
<FONT color="green">441</FONT> * Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach.<a name="line.441"></a>
445
<FONT color="green">442</FONT> * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/<a name="line.442"></a>
446
<FONT color="green">443</FONT> * </p><a name="line.443"></a>
447
<FONT color="green">444</FONT> * <a name="line.444"></a>
448
<FONT color="green">445</FONT> * @param in<a name="line.445"></a>
449
<FONT color="green">446</FONT> * byte[] array of binary data to base64 encode.<a name="line.446"></a>
450
<FONT color="green">447</FONT> * @param inPos<a name="line.447"></a>
451
<FONT color="green">448</FONT> * Position to start reading data from.<a name="line.448"></a>
452
<FONT color="green">449</FONT> * @param inAvail<a name="line.449"></a>
453
<FONT color="green">450</FONT> * Amount of bytes available from input for encoding.<a name="line.450"></a>
454
<FONT color="green">451</FONT> */<a name="line.451"></a>
455
<FONT color="green">452</FONT> void encode(byte[] in, int inPos, int inAvail) {<a name="line.452"></a>
456
<FONT color="green">453</FONT> if (eof) {<a name="line.453"></a>
457
<FONT color="green">454</FONT> return;<a name="line.454"></a>
458
<FONT color="green">455</FONT> }<a name="line.455"></a>
459
<FONT color="green">456</FONT> // inAvail < 0 is how we're informed of EOF in the underlying data we're<a name="line.456"></a>
460
<FONT color="green">457</FONT> // encoding.<a name="line.457"></a>
461
<FONT color="green">458</FONT> if (inAvail < 0) {<a name="line.458"></a>
462
<FONT color="green">459</FONT> eof = true;<a name="line.459"></a>
463
<FONT color="green">460</FONT> if (buffer == null || buffer.length - pos < encodeSize) {<a name="line.460"></a>
464
<FONT color="green">461</FONT> resizeBuffer();<a name="line.461"></a>
465
<FONT color="green">462</FONT> }<a name="line.462"></a>
466
<FONT color="green">463</FONT> switch (modulus) {<a name="line.463"></a>
467
<FONT color="green">464</FONT> case 1 :<a name="line.464"></a>
468
<FONT color="green">465</FONT> buffer[pos++] = encodeTable[(x >> 2) & MASK_6BITS];<a name="line.465"></a>
469
<FONT color="green">466</FONT> buffer[pos++] = encodeTable[(x << 4) & MASK_6BITS];<a name="line.466"></a>
470
<FONT color="green">467</FONT> // URL-SAFE skips the padding to further reduce size.<a name="line.467"></a>
471
<FONT color="green">468</FONT> if (encodeTable == STANDARD_ENCODE_TABLE) {<a name="line.468"></a>
472
<FONT color="green">469</FONT> buffer[pos++] = PAD;<a name="line.469"></a>
473
<FONT color="green">470</FONT> buffer[pos++] = PAD;<a name="line.470"></a>
474
<FONT color="green">471</FONT> }<a name="line.471"></a>
475
<FONT color="green">472</FONT> break;<a name="line.472"></a>
476
<FONT color="green">473</FONT> <a name="line.473"></a>
477
<FONT color="green">474</FONT> case 2 :<a name="line.474"></a>
478
<FONT color="green">475</FONT> buffer[pos++] = encodeTable[(x >> 10) & MASK_6BITS];<a name="line.475"></a>
479
<FONT color="green">476</FONT> buffer[pos++] = encodeTable[(x >> 4) & MASK_6BITS];<a name="line.476"></a>
480
<FONT color="green">477</FONT> buffer[pos++] = encodeTable[(x << 2) & MASK_6BITS];<a name="line.477"></a>
481
<FONT color="green">478</FONT> // URL-SAFE skips the padding to further reduce size.<a name="line.478"></a>
482
<FONT color="green">479</FONT> if (encodeTable == STANDARD_ENCODE_TABLE) {<a name="line.479"></a>
483
<FONT color="green">480</FONT> buffer[pos++] = PAD;<a name="line.480"></a>
484
<FONT color="green">481</FONT> }<a name="line.481"></a>
485
<FONT color="green">482</FONT> break;<a name="line.482"></a>
486
<FONT color="green">483</FONT> }<a name="line.483"></a>
487
<FONT color="green">484</FONT> if (lineLength > 0 && pos > 0) {<a name="line.484"></a>
488
<FONT color="green">485</FONT> System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);<a name="line.485"></a>
489
<FONT color="green">486</FONT> pos += lineSeparator.length;<a name="line.486"></a>
490
<FONT color="green">487</FONT> }<a name="line.487"></a>
491
<FONT color="green">488</FONT> } else {<a name="line.488"></a>
492
<FONT color="green">489</FONT> for (int i = 0; i < inAvail; i++) {<a name="line.489"></a>
493
<FONT color="green">490</FONT> if (buffer == null || buffer.length - pos < encodeSize) {<a name="line.490"></a>
494
<FONT color="green">491</FONT> resizeBuffer();<a name="line.491"></a>
495
<FONT color="green">492</FONT> }<a name="line.492"></a>
496
<FONT color="green">493</FONT> modulus = (++modulus) % 3;<a name="line.493"></a>
497
<FONT color="green">494</FONT> int b = in[inPos++];<a name="line.494"></a>
498
<FONT color="green">495</FONT> if (b < 0) {<a name="line.495"></a>
499
<FONT color="green">496</FONT> b += 256;<a name="line.496"></a>
500
<FONT color="green">497</FONT> }<a name="line.497"></a>
501
<FONT color="green">498</FONT> x = (x << 8) + b;<a name="line.498"></a>
502
<FONT color="green">499</FONT> if (0 == modulus) {<a name="line.499"></a>
503
<FONT color="green">500</FONT> buffer[pos++] = encodeTable[(x >> 18) & MASK_6BITS];<a name="line.500"></a>
504
<FONT color="green">501</FONT> buffer[pos++] = encodeTable[(x >> 12) & MASK_6BITS];<a name="line.501"></a>
505
<FONT color="green">502</FONT> buffer[pos++] = encodeTable[(x >> 6) & MASK_6BITS];<a name="line.502"></a>
506
<FONT color="green">503</FONT> buffer[pos++] = encodeTable[x & MASK_6BITS];<a name="line.503"></a>
507
<FONT color="green">504</FONT> currentLinePos += 4;<a name="line.504"></a>
508
<FONT color="green">505</FONT> if (lineLength > 0 && lineLength <= currentLinePos) {<a name="line.505"></a>
509
<FONT color="green">506</FONT> System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);<a name="line.506"></a>
510
<FONT color="green">507</FONT> pos += lineSeparator.length;<a name="line.507"></a>
511
<FONT color="green">508</FONT> currentLinePos = 0;<a name="line.508"></a>
512
<FONT color="green">509</FONT> }<a name="line.509"></a>
513
<FONT color="green">510</FONT> }<a name="line.510"></a>
514
<FONT color="green">511</FONT> }<a name="line.511"></a>
515
<FONT color="green">512</FONT> }<a name="line.512"></a>
516
<FONT color="green">513</FONT> }<a name="line.513"></a>
517
<FONT color="green">514</FONT> <a name="line.514"></a>
518
<FONT color="green">515</FONT> /**<a name="line.515"></a>
519
<FONT color="green">516</FONT> * <p><a name="line.516"></a>
520
<FONT color="green">517</FONT> * Decodes all of the provided data, starting at inPos, for inAvail bytes. Should be called at least twice: once<a name="line.517"></a>
521
<FONT color="green">518</FONT> * with the data to decode, and once with inAvail set to "-1" to alert decoder that EOF has been reached. The "-1"<a name="line.518"></a>
522
<FONT color="green">519</FONT> * call is not necessary when decoding, but it doesn't hurt, either.<a name="line.519"></a>
523
<FONT color="green">520</FONT> * </p><a name="line.520"></a>
524
<FONT color="green">521</FONT> * <p><a name="line.521"></a>
525
<FONT color="green">522</FONT> * Ignores all non-base64 characters. This is how chunked (e.g. 76 character) data is handled, since CR and LF are<a name="line.522"></a>
526
<FONT color="green">523</FONT> * silently ignored, but has implications for other bytes, too. This method subscribes to the garbage-in,<a name="line.523"></a>
527
<FONT color="green">524</FONT> * garbage-out philosophy: it will not check the provided data for validity.<a name="line.524"></a>
528
<FONT color="green">525</FONT> * </p><a name="line.525"></a>
529
<FONT color="green">526</FONT> * <p><a name="line.526"></a>
530
<FONT color="green">527</FONT> * Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach.<a name="line.527"></a>
531
<FONT color="green">528</FONT> * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/<a name="line.528"></a>
532
<FONT color="green">529</FONT> * </p><a name="line.529"></a>
533
<FONT color="green">530</FONT> * <a name="line.530"></a>
534
<FONT color="green">531</FONT> * @param in<a name="line.531"></a>
535
<FONT color="green">532</FONT> * byte[] array of ascii data to base64 decode.<a name="line.532"></a>
536
<FONT color="green">533</FONT> * @param inPos<a name="line.533"></a>
537
<FONT color="green">534</FONT> * Position to start reading data from.<a name="line.534"></a>
538
<FONT color="green">535</FONT> * @param inAvail<a name="line.535"></a>
539
<FONT color="green">536</FONT> * Amount of bytes available from input for encoding.<a name="line.536"></a>
540
<FONT color="green">537</FONT> */<a name="line.537"></a>
541
<FONT color="green">538</FONT> void decode(byte[] in, int inPos, int inAvail) {<a name="line.538"></a>
542
<FONT color="green">539</FONT> if (eof) {<a name="line.539"></a>
543
<FONT color="green">540</FONT> return;<a name="line.540"></a>
544
<FONT color="green">541</FONT> }<a name="line.541"></a>
545
<FONT color="green">542</FONT> if (inAvail < 0) {<a name="line.542"></a>
546
<FONT color="green">543</FONT> eof = true;<a name="line.543"></a>
547
<FONT color="green">544</FONT> }<a name="line.544"></a>
548
<FONT color="green">545</FONT> for (int i = 0; i < inAvail; i++) {<a name="line.545"></a>
549
<FONT color="green">546</FONT> if (buffer == null || buffer.length - pos < decodeSize) {<a name="line.546"></a>
550
<FONT color="green">547</FONT> resizeBuffer();<a name="line.547"></a>
551
<FONT color="green">548</FONT> }<a name="line.548"></a>
552
<FONT color="green">549</FONT> byte b = in[inPos++];<a name="line.549"></a>
553
<FONT color="green">550</FONT> if (b == PAD) {<a name="line.550"></a>
554
<FONT color="green">551</FONT> // We're done.<a name="line.551"></a>
555
<FONT color="green">552</FONT> eof = true;<a name="line.552"></a>
556
<FONT color="green">553</FONT> break;<a name="line.553"></a>
557
<FONT color="green">554</FONT> } else {<a name="line.554"></a>
558
<FONT color="green">555</FONT> if (b >= 0 && b < DECODE_TABLE.length) {<a name="line.555"></a>
559
<FONT color="green">556</FONT> int result = DECODE_TABLE[b];<a name="line.556"></a>
560
<FONT color="green">557</FONT> if (result >= 0) {<a name="line.557"></a>
561
<FONT color="green">558</FONT> modulus = (++modulus) % 4;<a name="line.558"></a>
562
<FONT color="green">559</FONT> x = (x << 6) + result;<a name="line.559"></a>
563
<FONT color="green">560</FONT> if (modulus == 0) {<a name="line.560"></a>
564
<FONT color="green">561</FONT> buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS);<a name="line.561"></a>
565
<FONT color="green">562</FONT> buffer[pos++] = (byte) ((x >> 8) & MASK_8BITS);<a name="line.562"></a>
566
<FONT color="green">563</FONT> buffer[pos++] = (byte) (x & MASK_8BITS);<a name="line.563"></a>
567
<FONT color="green">564</FONT> }<a name="line.564"></a>
568
<FONT color="green">565</FONT> }<a name="line.565"></a>
569
<FONT color="green">566</FONT> }<a name="line.566"></a>
570
<FONT color="green">567</FONT> }<a name="line.567"></a>
571
<FONT color="green">568</FONT> }<a name="line.568"></a>
572
<FONT color="green">569</FONT> <a name="line.569"></a>
573
<FONT color="green">570</FONT> // Two forms of EOF as far as base64 decoder is concerned: actual<a name="line.570"></a>
574
<FONT color="green">571</FONT> // EOF (-1) and first time '=' character is encountered in stream.<a name="line.571"></a>
575
<FONT color="green">572</FONT> // This approach makes the '=' padding characters completely optional.<a name="line.572"></a>
576
<FONT color="green">573</FONT> if (eof && modulus != 0) {<a name="line.573"></a>
577
<FONT color="green">574</FONT> x = x << 6;<a name="line.574"></a>
578
<FONT color="green">575</FONT> switch (modulus) {<a name="line.575"></a>
579
<FONT color="green">576</FONT> case 2 :<a name="line.576"></a>
580
<FONT color="green">577</FONT> x = x << 6;<a name="line.577"></a>
581
<FONT color="green">578</FONT> buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS);<a name="line.578"></a>
582
<FONT color="green">579</FONT> break;<a name="line.579"></a>
583
<FONT color="green">580</FONT> case 3 :<a name="line.580"></a>
584
<FONT color="green">581</FONT> buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS);<a name="line.581"></a>
585
<FONT color="green">582</FONT> buffer[pos++] = (byte) ((x >> 8) & MASK_8BITS);<a name="line.582"></a>
586
<FONT color="green">583</FONT> break;<a name="line.583"></a>
587
<FONT color="green">584</FONT> }<a name="line.584"></a>
588
<FONT color="green">585</FONT> }<a name="line.585"></a>
589
<FONT color="green">586</FONT> }<a name="line.586"></a>
590
<FONT color="green">587</FONT> <a name="line.587"></a>
591
<FONT color="green">588</FONT> /**<a name="line.588"></a>
592
<FONT color="green">589</FONT> * Returns whether or not the <code>octet</code> is in the base 64 alphabet.<a name="line.589"></a>
593
<FONT color="green">590</FONT> * <a name="line.590"></a>
594
<FONT color="green">591</FONT> * @param octet<a name="line.591"></a>
595
<FONT color="green">592</FONT> * The value to test<a name="line.592"></a>
596
<FONT color="green">593</FONT> * @return <code>true</code> if the value is defined in the the base 64 alphabet, <code>false</code> otherwise.<a name="line.593"></a>
597
<FONT color="green">594</FONT> * @since 1.4<a name="line.594"></a>
598
<FONT color="green">595</FONT> */<a name="line.595"></a>
599
<FONT color="green">596</FONT> public static boolean isBase64(byte octet) {<a name="line.596"></a>
600
<FONT color="green">597</FONT> return octet == PAD || (octet >= 0 && octet < DECODE_TABLE.length && DECODE_TABLE[octet] != -1);<a name="line.597"></a>
601
<FONT color="green">598</FONT> }<a name="line.598"></a>
602
<FONT color="green">599</FONT> <a name="line.599"></a>
603
<FONT color="green">600</FONT> /**<a name="line.600"></a>
604
<FONT color="green">601</FONT> * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet. Currently the<a name="line.601"></a>
605
<FONT color="green">602</FONT> * method treats whitespace as valid.<a name="line.602"></a>
606
<FONT color="green">603</FONT> * <a name="line.603"></a>
607
<FONT color="green">604</FONT> * @param arrayOctet<a name="line.604"></a>
608
<FONT color="green">605</FONT> * byte array to test<a name="line.605"></a>
609
<FONT color="green">606</FONT> * @return <code>true</code> if all bytes are valid characters in the Base64 alphabet or if the byte array is empty;<a name="line.606"></a>
610
<FONT color="green">607</FONT> * false, otherwise<a name="line.607"></a>
611
<FONT color="green">608</FONT> */<a name="line.608"></a>
612
<FONT color="green">609</FONT> public static boolean isArrayByteBase64(byte[] arrayOctet) {<a name="line.609"></a>
613
<FONT color="green">610</FONT> for (int i = 0; i < arrayOctet.length; i++) {<a name="line.610"></a>
614
<FONT color="green">611</FONT> if (!isBase64(arrayOctet[i]) && !isWhiteSpace(arrayOctet[i])) {<a name="line.611"></a>
615
<FONT color="green">612</FONT> return false;<a name="line.612"></a>
616
<FONT color="green">613</FONT> }<a name="line.613"></a>
617
<FONT color="green">614</FONT> }<a name="line.614"></a>
618
<FONT color="green">615</FONT> return true;<a name="line.615"></a>
619
<FONT color="green">616</FONT> }<a name="line.616"></a>
620
<FONT color="green">617</FONT> <a name="line.617"></a>
621
<FONT color="green">618</FONT> /**<a name="line.618"></a>
622
<FONT color="green">619</FONT> * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.<a name="line.619"></a>
623
<FONT color="green">620</FONT> * <a name="line.620"></a>
624
<FONT color="green">621</FONT> * @param arrayOctet<a name="line.621"></a>
625
<FONT color="green">622</FONT> * byte array to test<a name="line.622"></a>
626
<FONT color="green">623</FONT> * @return <code>true</code> if any byte is a valid character in the Base64 alphabet; false herwise<a name="line.623"></a>
627
<FONT color="green">624</FONT> */<a name="line.624"></a>
628
<FONT color="green">625</FONT> private static boolean containsBase64Byte(byte[] arrayOctet) {<a name="line.625"></a>
629
<FONT color="green">626</FONT> for (int i = 0; i < arrayOctet.length; i++) {<a name="line.626"></a>
630
<FONT color="green">627</FONT> if (isBase64(arrayOctet[i])) {<a name="line.627"></a>
631
<FONT color="green">628</FONT> return true;<a name="line.628"></a>
632
<FONT color="green">629</FONT> }<a name="line.629"></a>
633
<FONT color="green">630</FONT> }<a name="line.630"></a>
634
<FONT color="green">631</FONT> return false;<a name="line.631"></a>
635
<FONT color="green">632</FONT> }<a name="line.632"></a>
636
<FONT color="green">633</FONT> <a name="line.633"></a>
637
<FONT color="green">634</FONT> /**<a name="line.634"></a>
638
<FONT color="green">635</FONT> * Encodes binary data using the base64 algorithm but does not chunk the output.<a name="line.635"></a>
639
<FONT color="green">636</FONT> * <a name="line.636"></a>
640
<FONT color="green">637</FONT> * @param binaryData<a name="line.637"></a>
641
<FONT color="green">638</FONT> * binary data to encode<a name="line.638"></a>
642
<FONT color="green">639</FONT> * @return byte[] containing Base64 characters in their UTF-8 representation.<a name="line.639"></a>
643
<FONT color="green">640</FONT> */<a name="line.640"></a>
644
<FONT color="green">641</FONT> public static byte[] encodeBase64(byte[] binaryData) {<a name="line.641"></a>
645
<FONT color="green">642</FONT> return encodeBase64(binaryData, false);<a name="line.642"></a>
646
<FONT color="green">643</FONT> }<a name="line.643"></a>
647
<FONT color="green">644</FONT> <a name="line.644"></a>
648
<FONT color="green">645</FONT> /**<a name="line.645"></a>
649
<FONT color="green">646</FONT> * Encodes binary data using the base64 algorithm into 76 character blocks separated by CRLF.<a name="line.646"></a>
650
<FONT color="green">647</FONT> *<a name="line.647"></a>
651
<FONT color="green">648</FONT> * @param binaryData<a name="line.648"></a>
652
<FONT color="green">649</FONT> * binary data to encode<a name="line.649"></a>
653
<FONT color="green">650</FONT> * @return String containing Base64 characters.<a name="line.650"></a>
654
<FONT color="green">651</FONT> * @since 1.4<a name="line.651"></a>
655
<FONT color="green">652</FONT> */ <a name="line.652"></a>
656
<FONT color="green">653</FONT> public static String encodeBase64String(byte[] binaryData) {<a name="line.653"></a>
657
<FONT color="green">654</FONT> return StringUtils.newStringUtf8(encodeBase64(binaryData, true));<a name="line.654"></a>
658
<FONT color="green">655</FONT> }<a name="line.655"></a>
659
<FONT color="green">656</FONT> <a name="line.656"></a>
660
<FONT color="green">657</FONT> /**<a name="line.657"></a>
661
<FONT color="green">658</FONT> * Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The<a name="line.658"></a>
662
<FONT color="green">659</FONT> * url-safe variation emits - and _ instead of + and / characters.<a name="line.659"></a>
663
<FONT color="green">660</FONT> * <a name="line.660"></a>
664
<FONT color="green">661</FONT> * @param binaryData<a name="line.661"></a>
665
<FONT color="green">662</FONT> * binary data to encode<a name="line.662"></a>
666
<FONT color="green">663</FONT> * @return byte[] containing Base64 characters in their UTF-8 representation.<a name="line.663"></a>
667
<FONT color="green">664</FONT> * @since 1.4<a name="line.664"></a>
668
<FONT color="green">665</FONT> */<a name="line.665"></a>
669
<FONT color="green">666</FONT> public static byte[] encodeBase64URLSafe(byte[] binaryData) {<a name="line.666"></a>
670
<FONT color="green">667</FONT> return encodeBase64(binaryData, false, true);<a name="line.667"></a>
671
<FONT color="green">668</FONT> }<a name="line.668"></a>
672
<FONT color="green">669</FONT> <a name="line.669"></a>
673
<FONT color="green">670</FONT> /**<a name="line.670"></a>
674
<FONT color="green">671</FONT> * Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The<a name="line.671"></a>
675
<FONT color="green">672</FONT> * url-safe variation emits - and _ instead of + and / characters.<a name="line.672"></a>
676
<FONT color="green">673</FONT> *<a name="line.673"></a>
677
<FONT color="green">674</FONT> * @param binaryData<a name="line.674"></a>
678
<FONT color="green">675</FONT> * binary data to encode<a name="line.675"></a>
679
<FONT color="green">676</FONT> * @return String containing Base64 characters<a name="line.676"></a>
680
<FONT color="green">677</FONT> * @since 1.4<a name="line.677"></a>
681
<FONT color="green">678</FONT> */ <a name="line.678"></a>
682
<FONT color="green">679</FONT> public static String encodeBase64URLSafeString(byte[] binaryData) {<a name="line.679"></a>
683
<FONT color="green">680</FONT> return StringUtils.newStringUtf8(encodeBase64(binaryData, false, true));<a name="line.680"></a>
684
<FONT color="green">681</FONT> } <a name="line.681"></a>
685
<FONT color="green">682</FONT> <a name="line.682"></a>
686
<FONT color="green">683</FONT> /**<a name="line.683"></a>
687
<FONT color="green">684</FONT> * Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks<a name="line.684"></a>
688
<FONT color="green">685</FONT> * <a name="line.685"></a>
689
<FONT color="green">686</FONT> * @param binaryData<a name="line.686"></a>
690
<FONT color="green">687</FONT> * binary data to encode<a name="line.687"></a>
691
<FONT color="green">688</FONT> * @return Base64 characters chunked in 76 character blocks<a name="line.688"></a>
692
<FONT color="green">689</FONT> */<a name="line.689"></a>
693
<FONT color="green">690</FONT> public static byte[] encodeBase64Chunked(byte[] binaryData) {<a name="line.690"></a>
694
<FONT color="green">691</FONT> return encodeBase64(binaryData, true);<a name="line.691"></a>
695
<FONT color="green">692</FONT> }<a name="line.692"></a>
696
<FONT color="green">693</FONT> <a name="line.693"></a>
697
<FONT color="green">694</FONT> /**<a name="line.694"></a>
698
<FONT color="green">695</FONT> * Decodes an Object using the base64 algorithm. This method is provided in order to satisfy the requirements of the<a name="line.695"></a>
699
<FONT color="green">696</FONT> * Decoder interface, and will throw a DecoderException if the supplied object is not of type byte[] or String.<a name="line.696"></a>
700
<FONT color="green">697</FONT> * <a name="line.697"></a>
701
<FONT color="green">698</FONT> * @param pObject<a name="line.698"></a>
702
<FONT color="green">699</FONT> * Object to decode<a name="line.699"></a>
703
<FONT color="green">700</FONT> * @return An object (of type byte[]) containing the binary data which corresponds to the byte[] or String supplied.<a name="line.700"></a>
704
<FONT color="green">701</FONT> * @throws DecoderException<a name="line.701"></a>
705
<FONT color="green">702</FONT> * if the parameter supplied is not of type byte[]<a name="line.702"></a>
706
<FONT color="green">703</FONT> */<a name="line.703"></a>
707
<FONT color="green">704</FONT> public Object decode(Object pObject) throws DecoderException { <a name="line.704"></a>
708
<FONT color="green">705</FONT> if (pObject instanceof byte[]) {<a name="line.705"></a>
709
<FONT color="green">706</FONT> return decode((byte[]) pObject);<a name="line.706"></a>
710
<FONT color="green">707</FONT> } else if (pObject instanceof String) {<a name="line.707"></a>
711
<FONT color="green">708</FONT> return decode((String) pObject);<a name="line.708"></a>
712
<FONT color="green">709</FONT> } else {<a name="line.709"></a>
713
<FONT color="green">710</FONT> throw new DecoderException("Parameter supplied to Base64 decode is not a byte[] or a String");<a name="line.710"></a>
714
<FONT color="green">711</FONT> }<a name="line.711"></a>
715
<FONT color="green">712</FONT> }<a name="line.712"></a>
716
<FONT color="green">713</FONT> <a name="line.713"></a>
717
<FONT color="green">714</FONT> /**<a name="line.714"></a>
718
<FONT color="green">715</FONT> * Decodes a String containing containing characters in the Base64 alphabet.<a name="line.715"></a>
719
<FONT color="green">716</FONT> *<a name="line.716"></a>
720
<FONT color="green">717</FONT> * @param pArray<a name="line.717"></a>
721
<FONT color="green">718</FONT> * A String containing Base64 character data<a name="line.718"></a>
722
<FONT color="green">719</FONT> * @return a byte array containing binary data<a name="line.719"></a>
723
<FONT color="green">720</FONT> * @since 1.4<a name="line.720"></a>
724
<FONT color="green">721</FONT> */<a name="line.721"></a>
725
<FONT color="green">722</FONT> public byte[] decode(String pArray) {<a name="line.722"></a>
726
<FONT color="green">723</FONT> return decode(StringUtils.getBytesUtf8(pArray));<a name="line.723"></a>
727
<FONT color="green">724</FONT> }<a name="line.724"></a>
728
<FONT color="green">725</FONT> <a name="line.725"></a>
729
<FONT color="green">726</FONT> /**<a name="line.726"></a>
730
<FONT color="green">727</FONT> * Decodes a byte[] containing containing characters in the Base64 alphabet.<a name="line.727"></a>
731
<FONT color="green">728</FONT> * <a name="line.728"></a>
732
<FONT color="green">729</FONT> * @param pArray<a name="line.729"></a>
733
<FONT color="green">730</FONT> * A byte array containing Base64 character data<a name="line.730"></a>
734
<FONT color="green">731</FONT> * @return a byte array containing binary data<a name="line.731"></a>
735
<FONT color="green">732</FONT> */<a name="line.732"></a>
736
<FONT color="green">733</FONT> public byte[] decode(byte[] pArray) {<a name="line.733"></a>
737
<FONT color="green">734</FONT> reset();<a name="line.734"></a>
738
<FONT color="green">735</FONT> if (pArray == null || pArray.length == 0) {<a name="line.735"></a>
739
<FONT color="green">736</FONT> return pArray;<a name="line.736"></a>
740
<FONT color="green">737</FONT> }<a name="line.737"></a>
741
<FONT color="green">738</FONT> long len = (pArray.length * 3) / 4;<a name="line.738"></a>
742
<FONT color="green">739</FONT> byte[] buf = new byte[(int) len];<a name="line.739"></a>
743
<FONT color="green">740</FONT> setInitialBuffer(buf, 0, buf.length);<a name="line.740"></a>
744
<FONT color="green">741</FONT> decode(pArray, 0, pArray.length);<a name="line.741"></a>
745
<FONT color="green">742</FONT> decode(pArray, 0, -1); // Notify decoder of EOF.<a name="line.742"></a>
746
<FONT color="green">743</FONT> <a name="line.743"></a>
747
<FONT color="green">744</FONT> // Would be nice to just return buf (like we sometimes do in the encode<a name="line.744"></a>
748
<FONT color="green">745</FONT> // logic), but we have no idea what the line-length was (could even be<a name="line.745"></a>
749
<FONT color="green">746</FONT> // variable). So we cannot determine ahead of time exactly how big an<a name="line.746"></a>
750
<FONT color="green">747</FONT> // array is necessary. Hence the need to construct a 2nd byte array to<a name="line.747"></a>
751
<FONT color="green">748</FONT> // hold the final result:<a name="line.748"></a>
752
<FONT color="green">749</FONT> <a name="line.749"></a>
753
<FONT color="green">750</FONT> byte[] result = new byte[pos];<a name="line.750"></a>
754
<FONT color="green">751</FONT> readResults(result, 0, result.length);<a name="line.751"></a>
755
<FONT color="green">752</FONT> return result;<a name="line.752"></a>
756
<FONT color="green">753</FONT> }<a name="line.753"></a>
757
<FONT color="green">754</FONT> <a name="line.754"></a>
758
<FONT color="green">755</FONT> /**<a name="line.755"></a>
759
<FONT color="green">756</FONT> * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.<a name="line.756"></a>
760
<FONT color="green">757</FONT> * <a name="line.757"></a>
761
<FONT color="green">758</FONT> * @param binaryData<a name="line.758"></a>
762
<FONT color="green">759</FONT> * Array containing binary data to encode.<a name="line.759"></a>
763
<FONT color="green">760</FONT> * @param isChunked<a name="line.760"></a>
764
<FONT color="green">761</FONT> * if <code>true</code> this encoder will chunk the base64 output into 76 character blocks<a name="line.761"></a>
765
<FONT color="green">762</FONT> * @return Base64-encoded data.<a name="line.762"></a>
766
<FONT color="green">763</FONT> * @throws IllegalArgumentException<a name="line.763"></a>
767
<FONT color="green">764</FONT> * Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}<a name="line.764"></a>
768
<FONT color="green">765</FONT> */<a name="line.765"></a>
769
<FONT color="green">766</FONT> public static byte[] encodeBase64(byte[] binaryData, boolean isChunked) {<a name="line.766"></a>
770
<FONT color="green">767</FONT> return encodeBase64(binaryData, isChunked, false);<a name="line.767"></a>
771
<FONT color="green">768</FONT> }<a name="line.768"></a>
772
<FONT color="green">769</FONT> <a name="line.769"></a>
773
<FONT color="green">770</FONT> /**<a name="line.770"></a>
774
<FONT color="green">771</FONT> * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.<a name="line.771"></a>
775
<FONT color="green">772</FONT> * <a name="line.772"></a>
776
<FONT color="green">773</FONT> * @param binaryData<a name="line.773"></a>
777
<FONT color="green">774</FONT> * Array containing binary data to encode.<a name="line.774"></a>
778
<FONT color="green">775</FONT> * @param isChunked<a name="line.775"></a>
779
<FONT color="green">776</FONT> * if <code>true</code> this encoder will chunk the base64 output into 76 character blocks<a name="line.776"></a>
780
<FONT color="green">777</FONT> * @param urlSafe<a name="line.777"></a>
781
<FONT color="green">778</FONT> * if <code>true</code> this encoder will emit - and _ instead of the usual + and / characters.<a name="line.778"></a>
782
<FONT color="green">779</FONT> * @return Base64-encoded data.<a name="line.779"></a>
783
<FONT color="green">780</FONT> * @throws IllegalArgumentException<a name="line.780"></a>
784
<FONT color="green">781</FONT> * Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}<a name="line.781"></a>
785
<FONT color="green">782</FONT> * @since 1.4<a name="line.782"></a>
786
<FONT color="green">783</FONT> */<a name="line.783"></a>
787
<FONT color="green">784</FONT> public static byte[] encodeBase64(byte[] binaryData, boolean isChunked, boolean urlSafe) {<a name="line.784"></a>
788
<FONT color="green">785</FONT> return encodeBase64(binaryData, isChunked, urlSafe, Integer.MAX_VALUE);<a name="line.785"></a>
789
<FONT color="green">786</FONT> }<a name="line.786"></a>
790
<FONT color="green">787</FONT> <a name="line.787"></a>
791
<FONT color="green">788</FONT> /**<a name="line.788"></a>
792
<FONT color="green">789</FONT> * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.<a name="line.789"></a>
793
<FONT color="green">790</FONT> * <a name="line.790"></a>
794
<FONT color="green">791</FONT> * @param binaryData<a name="line.791"></a>
795
<FONT color="green">792</FONT> * Array containing binary data to encode.<a name="line.792"></a>
796
<FONT color="green">793</FONT> * @param isChunked<a name="line.793"></a>
797
<FONT color="green">794</FONT> * if <code>true</code> this encoder will chunk the base64 output into 76 character blocks<a name="line.794"></a>
798
<FONT color="green">795</FONT> * @param urlSafe<a name="line.795"></a>
799
<FONT color="green">796</FONT> * if <code>true</code> this encoder will emit - and _ instead of the usual + and / characters.<a name="line.796"></a>
800
<FONT color="green">797</FONT> * @param maxResultSize<a name="line.797"></a>
801
<FONT color="green">798</FONT> * The maximum result size to accept.<a name="line.798"></a>
802
<FONT color="green">799</FONT> * @return Base64-encoded data.<a name="line.799"></a>
803
<FONT color="green">800</FONT> * @throws IllegalArgumentException<a name="line.800"></a>
804
<FONT color="green">801</FONT> * Thrown when the input array needs an output array bigger than maxResultSize<a name="line.801"></a>
805
<FONT color="green">802</FONT> * @since 1.4<a name="line.802"></a>
806
<FONT color="green">803</FONT> */<a name="line.803"></a>
807
<FONT color="green">804</FONT> public static byte[] encodeBase64(byte[] binaryData, boolean isChunked, boolean urlSafe, int maxResultSize) {<a name="line.804"></a>
808
<FONT color="green">805</FONT> if (binaryData == null || binaryData.length == 0) {<a name="line.805"></a>
809
<FONT color="green">806</FONT> return binaryData;<a name="line.806"></a>
810
<FONT color="green">807</FONT> }<a name="line.807"></a>
811
<FONT color="green">808</FONT> <a name="line.808"></a>
812
<FONT color="green">809</FONT> long len = getEncodeLength(binaryData, CHUNK_SIZE, CHUNK_SEPARATOR);<a name="line.809"></a>
813
<FONT color="green">810</FONT> if (len > maxResultSize) {<a name="line.810"></a>
814
<FONT color="green">811</FONT> throw new IllegalArgumentException("Input array too big, the output array would be bigger (" +<a name="line.811"></a>
815
<FONT color="green">812</FONT> len +<a name="line.812"></a>
816
<FONT color="green">813</FONT> ") than the specified maxium size of " +<a name="line.813"></a>
817
<FONT color="green">814</FONT> maxResultSize);<a name="line.814"></a>
818
<FONT color="green">815</FONT> }<a name="line.815"></a>
819
<FONT color="green">816</FONT> <a name="line.816"></a>
820
<FONT color="green">817</FONT> Base64 b64 = isChunked ? new Base64(urlSafe) : new Base64(0, CHUNK_SEPARATOR, urlSafe);<a name="line.817"></a>
821
<FONT color="green">818</FONT> return b64.encode(binaryData);<a name="line.818"></a>
822
<FONT color="green">819</FONT> }<a name="line.819"></a>
823
<FONT color="green">820</FONT> <a name="line.820"></a>
824
<FONT color="green">821</FONT> /**<a name="line.821"></a>
825
<FONT color="green">822</FONT> * Decodes a Base64 String into octets<a name="line.822"></a>
826
<FONT color="green">823</FONT> *<a name="line.823"></a>
827
<FONT color="green">824</FONT> * @param base64String<a name="line.824"></a>
828
<FONT color="green">825</FONT> * String containing Base64 data<a name="line.825"></a>
829
<FONT color="green">826</FONT> * @return Array containing decoded data.<a name="line.826"></a>
830
<FONT color="green">827</FONT> * @since 1.4<a name="line.827"></a>
831
<FONT color="green">828</FONT> */<a name="line.828"></a>
832
<FONT color="green">829</FONT> public static byte[] decodeBase64(String base64String) {<a name="line.829"></a>
833
<FONT color="green">830</FONT> return new Base64().decode(base64String);<a name="line.830"></a>
834
<FONT color="green">831</FONT> }<a name="line.831"></a>
835
<FONT color="green">832</FONT> <a name="line.832"></a>
836
<FONT color="green">833</FONT> /**<a name="line.833"></a>
837
<FONT color="green">834</FONT> * Decodes Base64 data into octets<a name="line.834"></a>
838
<FONT color="green">835</FONT> * <a name="line.835"></a>
839
<FONT color="green">836</FONT> * @param base64Data<a name="line.836"></a>
840
<FONT color="green">837</FONT> * Byte array containing Base64 data<a name="line.837"></a>
841
<FONT color="green">838</FONT> * @return Array containing decoded data.<a name="line.838"></a>
842
<FONT color="green">839</FONT> */<a name="line.839"></a>
843
<FONT color="green">840</FONT> public static byte[] decodeBase64(byte[] base64Data) {<a name="line.840"></a>
844
<FONT color="green">841</FONT> return new Base64().decode(base64Data);<a name="line.841"></a>
845
<FONT color="green">842</FONT> }<a name="line.842"></a>
846
<FONT color="green">843</FONT> <a name="line.843"></a>
847
<FONT color="green">844</FONT> /**<a name="line.844"></a>
848
<FONT color="green">845</FONT> * Discards any whitespace from a base-64 encoded block.<a name="line.845"></a>
849
<FONT color="green">846</FONT> * <a name="line.846"></a>
850
<FONT color="green">847</FONT> * @param data<a name="line.847"></a>
851
<FONT color="green">848</FONT> * The base-64 encoded data to discard the whitespace from.<a name="line.848"></a>
852
<FONT color="green">849</FONT> * @return The data, less whitespace (see RFC 2045).<a name="line.849"></a>
853
<FONT color="green">850</FONT> * @deprecated This method is no longer needed<a name="line.850"></a>
854
<FONT color="green">851</FONT> */<a name="line.851"></a>
855
<FONT color="green">852</FONT> static byte[] discardWhitespace(byte[] data) {<a name="line.852"></a>
856
<FONT color="green">853</FONT> byte groomedData[] = new byte[data.length];<a name="line.853"></a>
857
<FONT color="green">854</FONT> int bytesCopied = 0;<a name="line.854"></a>
858
<FONT color="green">855</FONT> for (int i = 0; i < data.length; i++) {<a name="line.855"></a>
859
<FONT color="green">856</FONT> switch (data[i]) {<a name="line.856"></a>
860
<FONT color="green">857</FONT> case ' ' :<a name="line.857"></a>
861
<FONT color="green">858</FONT> case '\n' :<a name="line.858"></a>
862
<FONT color="green">859</FONT> case '\r' :<a name="line.859"></a>
863
<FONT color="green">860</FONT> case '\t' :<a name="line.860"></a>
864
<FONT color="green">861</FONT> break;<a name="line.861"></a>
865
<FONT color="green">862</FONT> default :<a name="line.862"></a>
866
<FONT color="green">863</FONT> groomedData[bytesCopied++] = data[i];<a name="line.863"></a>
867
<FONT color="green">864</FONT> }<a name="line.864"></a>
868
<FONT color="green">865</FONT> }<a name="line.865"></a>
869
<FONT color="green">866</FONT> byte packedData[] = new byte[bytesCopied];<a name="line.866"></a>
870
<FONT color="green">867</FONT> System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);<a name="line.867"></a>
871
<FONT color="green">868</FONT> return packedData;<a name="line.868"></a>
872
<FONT color="green">869</FONT> }<a name="line.869"></a>
873
<FONT color="green">870</FONT> <a name="line.870"></a>
874
<FONT color="green">871</FONT> /**<a name="line.871"></a>
875
<FONT color="green">872</FONT> * Checks if a byte value is whitespace or not.<a name="line.872"></a>
876
<FONT color="green">873</FONT> * <a name="line.873"></a>
877
<FONT color="green">874</FONT> * @param byteToCheck<a name="line.874"></a>
878
<FONT color="green">875</FONT> * the byte to check<a name="line.875"></a>
879
<FONT color="green">876</FONT> * @return true if byte is whitespace, false otherwise<a name="line.876"></a>
880
<FONT color="green">877</FONT> */<a name="line.877"></a>
881
<FONT color="green">878</FONT> private static boolean isWhiteSpace(byte byteToCheck) {<a name="line.878"></a>
882
<FONT color="green">879</FONT> switch (byteToCheck) {<a name="line.879"></a>
883
<FONT color="green">880</FONT> case ' ' :<a name="line.880"></a>
884
<FONT color="green">881</FONT> case '\n' :<a name="line.881"></a>
885
<FONT color="green">882</FONT> case '\r' :<a name="line.882"></a>
886
<FONT color="green">883</FONT> case '\t' :<a name="line.883"></a>
887
<FONT color="green">884</FONT> return true;<a name="line.884"></a>
888
<FONT color="green">885</FONT> default :<a name="line.885"></a>
889
<FONT color="green">886</FONT> return false;<a name="line.886"></a>
890
<FONT color="green">887</FONT> }<a name="line.887"></a>
891
<FONT color="green">888</FONT> }<a name="line.888"></a>
892
<FONT color="green">889</FONT> <a name="line.889"></a>
893
<FONT color="green">890</FONT> // Implementation of the Encoder Interface<a name="line.890"></a>
894
<FONT color="green">891</FONT> <a name="line.891"></a>
895
<FONT color="green">892</FONT> /**<a name="line.892"></a>
896
<FONT color="green">893</FONT> * Encodes an Object using the base64 algorithm. This method is provided in order to satisfy the requirements of the<a name="line.893"></a>
897
<FONT color="green">894</FONT> * Encoder interface, and will throw an EncoderException if the supplied object is not of type byte[].<a name="line.894"></a>
898
<FONT color="green">895</FONT> * <a name="line.895"></a>
899
<FONT color="green">896</FONT> * @param pObject<a name="line.896"></a>
900
<FONT color="green">897</FONT> * Object to encode<a name="line.897"></a>
901
<FONT color="green">898</FONT> * @return An object (of type byte[]) containing the base64 encoded data which corresponds to the byte[] supplied.<a name="line.898"></a>
902
<FONT color="green">899</FONT> * @throws EncoderException<a name="line.899"></a>
903
<FONT color="green">900</FONT> * if the parameter supplied is not of type byte[]<a name="line.900"></a>
904
<FONT color="green">901</FONT> */<a name="line.901"></a>
905
<FONT color="green">902</FONT> public Object encode(Object pObject) throws EncoderException {<a name="line.902"></a>
906
<FONT color="green">903</FONT> if (!(pObject instanceof byte[])) {<a name="line.903"></a>
907
<FONT color="green">904</FONT> throw new EncoderException("Parameter supplied to Base64 encode is not a byte[]");<a name="line.904"></a>
908
<FONT color="green">905</FONT> }<a name="line.905"></a>
909
<FONT color="green">906</FONT> return encode((byte[]) pObject);<a name="line.906"></a>
910
<FONT color="green">907</FONT> }<a name="line.907"></a>
911
<FONT color="green">908</FONT> <a name="line.908"></a>
912
<FONT color="green">909</FONT> /**<a name="line.909"></a>
913
<FONT color="green">910</FONT> * Encodes a byte[] containing binary data, into a String containing characters in the Base64 alphabet.<a name="line.910"></a>
914
<FONT color="green">911</FONT> *<a name="line.911"></a>
915
<FONT color="green">912</FONT> * @param pArray<a name="line.912"></a>
916
<FONT color="green">913</FONT> * a byte array containing binary data<a name="line.913"></a>
917
<FONT color="green">914</FONT> * @return A String containing only Base64 character data<a name="line.914"></a>
918
<FONT color="green">915</FONT> * @since 1.4<a name="line.915"></a>
919
<FONT color="green">916</FONT> */ <a name="line.916"></a>
920
<FONT color="green">917</FONT> public String encodeToString(byte[] pArray) {<a name="line.917"></a>
921
<FONT color="green">918</FONT> return StringUtils.newStringUtf8(encode(pArray));<a name="line.918"></a>
922
<FONT color="green">919</FONT> }<a name="line.919"></a>
923
<FONT color="green">920</FONT> <a name="line.920"></a>
924
<FONT color="green">921</FONT> /**<a name="line.921"></a>
925
<FONT color="green">922</FONT> * Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64 alphabet.<a name="line.922"></a>
926
<FONT color="green">923</FONT> * <a name="line.923"></a>
927
<FONT color="green">924</FONT> * @param pArray<a name="line.924"></a>
928
<FONT color="green">925</FONT> * a byte array containing binary data<a name="line.925"></a>
929
<FONT color="green">926</FONT> * @return A byte array containing only Base64 character data<a name="line.926"></a>
930
<FONT color="green">927</FONT> */<a name="line.927"></a>
931
<FONT color="green">928</FONT> public byte[] encode(byte[] pArray) {<a name="line.928"></a>
932
<FONT color="green">929</FONT> reset(); <a name="line.929"></a>
933
<FONT color="green">930</FONT> if (pArray == null || pArray.length == 0) {<a name="line.930"></a>
934
<FONT color="green">931</FONT> return pArray;<a name="line.931"></a>
935
<FONT color="green">932</FONT> }<a name="line.932"></a>
936
<FONT color="green">933</FONT> long len = getEncodeLength(pArray, lineLength, lineSeparator);<a name="line.933"></a>
937
<FONT color="green">934</FONT> byte[] buf = new byte[(int) len];<a name="line.934"></a>
938
<FONT color="green">935</FONT> setInitialBuffer(buf, 0, buf.length);<a name="line.935"></a>
939
<FONT color="green">936</FONT> encode(pArray, 0, pArray.length);<a name="line.936"></a>
940
<FONT color="green">937</FONT> encode(pArray, 0, -1); // Notify encoder of EOF.<a name="line.937"></a>
941
<FONT color="green">938</FONT> // Encoder might have resized, even though it was unnecessary.<a name="line.938"></a>
942
<FONT color="green">939</FONT> if (buffer != buf) {<a name="line.939"></a>
943
<FONT color="green">940</FONT> readResults(buf, 0, buf.length);<a name="line.940"></a>
944
<FONT color="green">941</FONT> }<a name="line.941"></a>
945
<FONT color="green">942</FONT> // In URL-SAFE mode we skip the padding characters, so sometimes our<a name="line.942"></a>
946
<FONT color="green">943</FONT> // final length is a bit smaller.<a name="line.943"></a>
947
<FONT color="green">944</FONT> if (isUrlSafe() && pos < buf.length) {<a name="line.944"></a>
948
<FONT color="green">945</FONT> byte[] smallerBuf = new byte[pos];<a name="line.945"></a>
949
<FONT color="green">946</FONT> System.arraycopy(buf, 0, smallerBuf, 0, pos);<a name="line.946"></a>
950
<FONT color="green">947</FONT> buf = smallerBuf;<a name="line.947"></a>
951
<FONT color="green">948</FONT> }<a name="line.948"></a>
952
<FONT color="green">949</FONT> return buf; <a name="line.949"></a>
953
<FONT color="green">950</FONT> }<a name="line.950"></a>
954
<FONT color="green">951</FONT> <a name="line.951"></a>
955
<FONT color="green">952</FONT> /**<a name="line.952"></a>
956
<FONT color="green">953</FONT> * Pre-calculates the amount of space needed to base64-encode the supplied array.<a name="line.953"></a>
957
<FONT color="green">954</FONT> *<a name="line.954"></a>
958
<FONT color="green">955</FONT> * @param pArray byte[] array which will later be encoded<a name="line.955"></a>
959
<FONT color="green">956</FONT> * @param chunkSize line-length of the output (<= 0 means no chunking) between each<a name="line.956"></a>
960
<FONT color="green">957</FONT> * chunkSeparator (e.g. CRLF).<a name="line.957"></a>
961
<FONT color="green">958</FONT> * @param chunkSeparator the sequence of bytes used to separate chunks of output (e.g. CRLF).<a name="line.958"></a>
962
<FONT color="green">959</FONT> *<a name="line.959"></a>
963
<FONT color="green">960</FONT> * @return amount of space needed to encoded the supplied array. Returns<a name="line.960"></a>
964
<FONT color="green">961</FONT> * a long since a max-len array will require Integer.MAX_VALUE + 33%.<a name="line.961"></a>
965
<FONT color="green">962</FONT> */<a name="line.962"></a>
966
<FONT color="green">963</FONT> private static long getEncodeLength(byte[] pArray, int chunkSize, byte[] chunkSeparator) {<a name="line.963"></a>
967
<FONT color="green">964</FONT> // base64 always encodes to multiples of 4.<a name="line.964"></a>
968
<FONT color="green">965</FONT> chunkSize = (chunkSize / 4) * 4;<a name="line.965"></a>
969
<FONT color="green">966</FONT> <a name="line.966"></a>
970
<FONT color="green">967</FONT> long len = (pArray.length * 4) / 3;<a name="line.967"></a>
971
<FONT color="green">968</FONT> long mod = len % 4;<a name="line.968"></a>
972
<FONT color="green">969</FONT> if (mod != 0) {<a name="line.969"></a>
973
<FONT color="green">970</FONT> len += 4 - mod;<a name="line.970"></a>
974
<FONT color="green">971</FONT> }<a name="line.971"></a>
975
<FONT color="green">972</FONT> if (chunkSize > 0) {<a name="line.972"></a>
976
<FONT color="green">973</FONT> boolean lenChunksPerfectly = len % chunkSize == 0;<a name="line.973"></a>
977
<FONT color="green">974</FONT> len += (len / chunkSize) * chunkSeparator.length;<a name="line.974"></a>
978
<FONT color="green">975</FONT> if (!lenChunksPerfectly) {<a name="line.975"></a>
979
<FONT color="green">976</FONT> len += chunkSeparator.length;<a name="line.976"></a>
980
<FONT color="green">977</FONT> }<a name="line.977"></a>
981
<FONT color="green">978</FONT> }<a name="line.978"></a>
982
<FONT color="green">979</FONT> return len;<a name="line.979"></a>
983
<FONT color="green">980</FONT> }<a name="line.980"></a>
984
<FONT color="green">981</FONT> <a name="line.981"></a>
985
<FONT color="green">982</FONT> // Implementation of integer encoding used for crypto<a name="line.982"></a>
986
<FONT color="green">983</FONT> /**<a name="line.983"></a>
987
<FONT color="green">984</FONT> * Decodes a byte64-encoded integer according to crypto standards such as W3C's XML-Signature<a name="line.984"></a>
988
<FONT color="green">985</FONT> * <a name="line.985"></a>
989
<FONT color="green">986</FONT> * @param pArray<a name="line.986"></a>
990
<FONT color="green">987</FONT> * a byte array containing base64 character data<a name="line.987"></a>
991
<FONT color="green">988</FONT> * @return A BigInteger<a name="line.988"></a>
992
<FONT color="green">989</FONT> * @since 1.4<a name="line.989"></a>
993
<FONT color="green">990</FONT> */<a name="line.990"></a>
994
<FONT color="green">991</FONT> public static BigInteger decodeInteger(byte[] pArray) {<a name="line.991"></a>
995
<FONT color="green">992</FONT> return new BigInteger(1, decodeBase64(pArray));<a name="line.992"></a>
996
<FONT color="green">993</FONT> }<a name="line.993"></a>
997
<FONT color="green">994</FONT> <a name="line.994"></a>
998
<FONT color="green">995</FONT> /**<a name="line.995"></a>
999
<FONT color="green">996</FONT> * Encodes to a byte64-encoded integer according to crypto standards such as W3C's XML-Signature<a name="line.996"></a>
1000
<FONT color="green">997</FONT> * <a name="line.997"></a>
1001
<FONT color="green">998</FONT> * @param bigInt<a name="line.998"></a>
1002
<FONT color="green">999</FONT> * a BigInteger<a name="line.999"></a>
1003
<FONT color="green">1000</FONT> * @return A byte array containing base64 character data<a name="line.1000"></a>
1004
<FONT color="green">1001</FONT> * @throws NullPointerException<a name="line.1001"></a>
1005
<FONT color="green">1002</FONT> * if null is passed in<a name="line.1002"></a>
1006
<FONT color="green">1003</FONT> * @since 1.4<a name="line.1003"></a>
1007
<FONT color="green">1004</FONT> */<a name="line.1004"></a>
1008
<FONT color="green">1005</FONT> public static byte[] encodeInteger(BigInteger bigInt) {<a name="line.1005"></a>
1009
<FONT color="green">1006</FONT> if (bigInt == null) {<a name="line.1006"></a>
1010
<FONT color="green">1007</FONT> throw new NullPointerException("encodeInteger called with null parameter");<a name="line.1007"></a>
1011
<FONT color="green">1008</FONT> }<a name="line.1008"></a>
1012
<FONT color="green">1009</FONT> return encodeBase64(toIntegerBytes(bigInt), false);<a name="line.1009"></a>
1013
<FONT color="green">1010</FONT> }<a name="line.1010"></a>
1014
<FONT color="green">1011</FONT> <a name="line.1011"></a>
1015
<FONT color="green">1012</FONT> /**<a name="line.1012"></a>
1016
<FONT color="green">1013</FONT> * Returns a byte-array representation of a <code>BigInteger</code> without sign bit.<a name="line.1013"></a>
1017
<FONT color="green">1014</FONT> * <a name="line.1014"></a>
1018
<FONT color="green">1015</FONT> * @param bigInt<a name="line.1015"></a>
1019
<FONT color="green">1016</FONT> * <code>BigInteger</code> to be converted<a name="line.1016"></a>
1020
<FONT color="green">1017</FONT> * @return a byte array representation of the BigInteger parameter<a name="line.1017"></a>
1021
<FONT color="green">1018</FONT> */<a name="line.1018"></a>
1022
<FONT color="green">1019</FONT> static byte[] toIntegerBytes(BigInteger bigInt) {<a name="line.1019"></a>
1023
<FONT color="green">1020</FONT> int bitlen = bigInt.bitLength();<a name="line.1020"></a>
1024
<FONT color="green">1021</FONT> // round bitlen<a name="line.1021"></a>
1025
<FONT color="green">1022</FONT> bitlen = ((bitlen + 7) >> 3) << 3;<a name="line.1022"></a>
1026
<FONT color="green">1023</FONT> byte[] bigBytes = bigInt.toByteArray();<a name="line.1023"></a>
1027
<FONT color="green">1024</FONT> <a name="line.1024"></a>
1028
<FONT color="green">1025</FONT> if (((bigInt.bitLength() % 8) != 0) && (((bigInt.bitLength() / 8) + 1) == (bitlen / 8))) {<a name="line.1025"></a>
1029
<FONT color="green">1026</FONT> return bigBytes;<a name="line.1026"></a>
1030
<FONT color="green">1027</FONT> }<a name="line.1027"></a>
1031
<FONT color="green">1028</FONT> // set up params for copying everything but sign bit<a name="line.1028"></a>
1032
<FONT color="green">1029</FONT> int startSrc = 0;<a name="line.1029"></a>
1033
<FONT color="green">1030</FONT> int len = bigBytes.length;<a name="line.1030"></a>
1034
<FONT color="green">1031</FONT> <a name="line.1031"></a>
1035
<FONT color="green">1032</FONT> // if bigInt is exactly byte-aligned, just skip signbit in copy<a name="line.1032"></a>
1036
<FONT color="green">1033</FONT> if ((bigInt.bitLength() % 8) == 0) {<a name="line.1033"></a>
1037
<FONT color="green">1034</FONT> startSrc = 1;<a name="line.1034"></a>
1038
<FONT color="green">1035</FONT> len--;<a name="line.1035"></a>
1039
<FONT color="green">1036</FONT> }<a name="line.1036"></a>
1040
<FONT color="green">1037</FONT> int startDst = bitlen / 8 - len; // to pad w/ nulls as per spec<a name="line.1037"></a>
1041
<FONT color="green">1038</FONT> byte[] resizedBytes = new byte[bitlen / 8];<a name="line.1038"></a>
1042
<FONT color="green">1039</FONT> System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, len);<a name="line.1039"></a>
1043
<FONT color="green">1040</FONT> return resizedBytes;<a name="line.1040"></a>
1044
<FONT color="green">1041</FONT> }<a name="line.1041"></a>
1045
<FONT color="green">1042</FONT> <a name="line.1042"></a>
1046
<FONT color="green">1043</FONT> /**<a name="line.1043"></a>
1047
<FONT color="green">1044</FONT> * Resets this Base64 object to its initial newly constructed state.<a name="line.1044"></a>
1048
<FONT color="green">1045</FONT> */<a name="line.1045"></a>
1049
<FONT color="green">1046</FONT> private void reset() {<a name="line.1046"></a>
1050
<FONT color="green">1047</FONT> buffer = null;<a name="line.1047"></a>
1051
<FONT color="green">1048</FONT> pos = 0;<a name="line.1048"></a>
1052
<FONT color="green">1049</FONT> readPos = 0;<a name="line.1049"></a>
1053
<FONT color="green">1050</FONT> currentLinePos = 0;<a name="line.1050"></a>
1054
<FONT color="green">1051</FONT> modulus = 0;<a name="line.1051"></a>
1055
<FONT color="green">1052</FONT> eof = false;<a name="line.1052"></a>
1056
<FONT color="green">1053</FONT> }<a name="line.1053"></a>
1057
<FONT color="green">1054</FONT> <a name="line.1054"></a>
1058
<FONT color="green">1055</FONT> }<a name="line.1055"></a>