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<h1>base64.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/***************************************************************************</span>
<a name="l00002"></a>00002 <span class="comment"> copyright : (C) 2002-2008 by Stefano Barbato</span>
<a name="l00003"></a>00003 <span class="comment"> email : stefano@codesink.org</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> $Id: base64.h,v 1.15 2008-10-07 11:06:26 tat Exp $</span>
<a name="l00006"></a>00006 <span class="comment"> ***************************************************************************/</span>
<a name="l00007"></a>00007
<a name="l00008"></a>00008 <span class="comment">/***************************************************************************</span>
<a name="l00009"></a>00009 <span class="comment"> * *</span>
<a name="l00010"></a>00010 <span class="comment"> * This program is free software; you can redistribute it and/or modify *</span>
<a name="l00011"></a>00011 <span class="comment"> * it under the terms of the GNU General Public License as published by *</span>
<a name="l00012"></a>00012 <span class="comment"> * the Free Software Foundation; either version 2 of the License, or *</span>
<a name="l00013"></a>00013 <span class="comment"> * (at your option) any later version. *</span>
<a name="l00014"></a>00014 <span class="comment"> * *</span>
<a name="l00015"></a>00015 <span class="comment"> ***************************************************************************/</span>
<a name="l00016"></a>00016 <span class="preprocessor">#ifndef _MIMETIC_CODEC_BASE64_H_</span>
<a name="l00017"></a>00017 <span class="preprocessor"></span><span class="preprocessor">#define _MIMETIC_CODEC_BASE64_H_</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#include <mimetic/circular_buffer.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <mimetic/codec/codec_base.h></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include <mimetic/codec/codec_chain.h></span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="keyword">namespace </span>mimetic
<a name="l00023"></a>00023 {
<a name="l00024"></a>00024
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="keyword">class </span>Base64
<a name="l00027"></a>00027 {
<a name="l00028"></a>00028 <span class="keyword">enum</span> { LF = 0xA, CR = 0xD, NL = <span class="charliteral">'\n'</span> };
<a name="l00029"></a>00029 <span class="keyword">enum</span> { default_maxlen = 76 };
<a name="l00030"></a>00030 <span class="keyword">enum</span> { eq_sign = 100 };
<a name="l00031"></a>00031 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> sEncTable[];
<a name="l00032"></a>00032 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> sDecTable[];
<a name="l00033"></a>00033 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> sDecTableSz;
<a name="l00034"></a>00034 <span class="keyword">public</span>:
<a name="l00035"></a>00035 <span class="keyword">class </span>Encoder; <span class="keyword">class </span>Decoder;
<a name="l00036"></a>00036 <span class="keyword">typedef</span> Encoder encoder_type;
<a name="l00037"></a>00037 <span class="keyword">typedef</span> Decoder decoder_type;
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="comment"></span>
<a name="l00040"></a>00040 <span class="comment">/// Base64 encoder</span>
<a name="l00041"></a>00041 <span class="comment"></span><span class="comment">/*!</span>
<a name="l00042"></a>00042 <span class="comment"></span>
<a name="l00043"></a>00043 <span class="comment"> \sa encode decode</span>
<a name="l00044"></a>00044 <span class="comment"> */</span>
<a name="l00045"></a><a class="code" href="classmimetic_1_1Base64_1_1Encoder.html">00045</a> <span class="keyword">class </span><a class="code" href="classmimetic_1_1Base64_1_1Encoder.html" title="Base64 encoder.">Encoder</a>: <span class="keyword">public</span> <a class="code" href="structmimetic_1_1buffered__codec.html" title="Base class for buffered codecs.">buffered_codec</a>, <span class="keyword">public</span> chainable_codec<Encoder>
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 <span class="keyword">enum</span> { pad_idx = 64 };
<a name="l00048"></a>00048 char_type m_ch[3];
<a name="l00049"></a>00049 <span class="keywordtype">int</span> m_cidx;
<a name="l00050"></a>00050 <span class="keywordtype">int</span> m_pos, m_maxlen;
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="keyword">template</span><<span class="keyword">typename</span> OutIt>
<a name="l00053"></a>00053 <span class="keyword">inline</span> <span class="keywordtype">void</span> writeBuf(OutIt& out)
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 <span class="keywordtype">int</span> pad_count = 3 - m_cidx;
<a name="l00056"></a>00056 m_cidx = 0;
<a name="l00057"></a>00057 <span class="keywordtype">int</span> idx[4];
<a name="l00058"></a>00058 idx[0] = m_ch[0] >> 2;
<a name="l00059"></a>00059 <span class="keywordflow">switch</span>(pad_count)
<a name="l00060"></a>00060 {
<a name="l00061"></a>00061 <span class="keywordflow">case</span> 0:
<a name="l00062"></a>00062 idx[1] = (((m_ch[0] & 3) << 4) | (m_ch[1] >> 4));
<a name="l00063"></a>00063 idx[2] = ((m_ch[1] & 0xf) << 2) | (m_ch[2] >> 6);
<a name="l00064"></a>00064 idx[3] = m_ch[2] & 0x3f;
<a name="l00065"></a>00065 <span class="keywordflow">break</span>;
<a name="l00066"></a>00066 <span class="keywordflow">case</span> 1:
<a name="l00067"></a>00067 idx[1] = (((m_ch[0] & 3) << 4) | (m_ch[1] >> 4));
<a name="l00068"></a>00068 idx[2] = (m_ch[1] & 0xf) << 2 ;
<a name="l00069"></a>00069 idx[3] = pad_idx;
<a name="l00070"></a>00070 <span class="keywordflow">break</span>;
<a name="l00071"></a>00071 <span class="keywordflow">case</span> 2:
<a name="l00072"></a>00072 idx[1] = (m_ch[0] & 3) << 4;
<a name="l00073"></a>00073 idx[2] = idx[3] = pad_idx;
<a name="l00074"></a>00074 <span class="keywordflow">break</span>;
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i < 4; ++i)
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 *out = sEncTable[ idx[i] ]; ++out;
<a name="l00079"></a>00079 <span class="keywordflow">if</span>(m_maxlen && ++m_pos > m_maxlen)
<a name="l00080"></a>00080 {
<a name="l00081"></a>00081 *out = NL; ++out;
<a name="l00082"></a>00082 m_pos = 1;
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086 <span class="keyword">public</span>:<span class="comment"></span>
<a name="l00087"></a>00087 <span class="comment"> /*! return the multiplier of the required (max) size of the output buffer </span>
<a name="l00088"></a>00088 <span class="comment"> * when encoding */</span>
<a name="l00089"></a><a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a3f7e5c55d1d8770c2036851c63abaa4a">00089</a> <span class="keywordtype">double</span> <a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a3f7e5c55d1d8770c2036851c63abaa4a">codeSizeMultiplier</a>()<span class="keyword"> const</span>
<a name="l00090"></a>00090 <span class="keyword"> </span>{
<a name="l00091"></a>00091 <span class="keywordflow">return</span> 1.5;
<a name="l00092"></a>00092 }<span class="comment"></span>
<a name="l00093"></a>00093 <span class="comment"> /*! Constructor, maxlen is the maximum length of every encoded line */</span>
<a name="l00094"></a><a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#af27415de526b80ab03f3511fb4ca946e">00094</a> <a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#af27415de526b80ab03f3511fb4ca946e">Encoder</a>(<span class="keywordtype">int</span> maxlen = default_maxlen)
<a name="l00095"></a>00095 : m_cidx(0), m_pos(1), m_maxlen(maxlen)
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097 }<span class="comment"></span>
<a name="l00098"></a>00098 <span class="comment"> /*! Returns the name of the codec ("Base64") */</span>
<a name="l00099"></a><a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a862958aa3c2b9bf36903f1f0f2e81c54">00099</a> <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a862958aa3c2b9bf36903f1f0f2e81c54">name</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <span class="stringliteral">"Base64"</span>; }<span class="comment"></span>
<a name="l00100"></a>00100 <span class="comment"> /*! </span>
<a name="l00101"></a>00101 <span class="comment"> Encodes [\p bit,\p eit) and write any encoded char to \p out.</span>
<a name="l00102"></a>00102 <span class="comment"> */</span>
<a name="l00103"></a>00103 <span class="keyword">template</span><<span class="keyword">typename</span> InIt, <span class="keyword">typename</span> OutIt>
<a name="l00104"></a><a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a506ee19056777786b25884008b384b72">00104</a> <span class="keywordtype">void</span> <a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a506ee19056777786b25884008b384b72">process</a>(InIt bit, InIt eit, OutIt out)
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106 <span class="keywordflow">for</span>(; bit != eit; ++bit)
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108 m_ch[m_cidx++] = (char_type)*bit;
<a name="l00109"></a>00109 <span class="keywordflow">if</span>(m_cidx < 3)
<a name="l00110"></a>00110 <span class="keywordflow">continue</span>;
<a name="l00111"></a>00111 writeBuf(out);
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113 <span class="keywordflow">if</span>(m_cidx > 0)
<a name="l00114"></a>00114 writeBuf(out);
<a name="l00115"></a>00115 }<span class="comment"></span>
<a name="l00116"></a>00116 <span class="comment"> /*! </span>
<a name="l00117"></a>00117 <span class="comment"> Encodes \p c and write any encoded output char to \p out.</span>
<a name="l00118"></a>00118 <span class="comment"> \warning You must call flush() when all chars have been </span>
<a name="l00119"></a>00119 <span class="comment"> processed by the encode funcion.</span>
<a name="l00120"></a>00120 <span class="comment"> \n</span>
<a name="l00121"></a>00121 <span class="comment"> \code</span>
<a name="l00122"></a>00122 <span class="comment"> while( (c = getchar()) != EOF )</span>
<a name="l00123"></a>00123 <span class="comment"> b64.encode(c, out); </span>
<a name="l00124"></a>00124 <span class="comment"> b64.flush();</span>
<a name="l00125"></a>00125 <span class="comment"> \endcode</span>
<a name="l00126"></a>00126 <span class="comment"> \n</span>
<a name="l00127"></a>00127 <span class="comment"> \sa flush()</span>
<a name="l00128"></a>00128 <span class="comment"> */</span>
<a name="l00129"></a>00129 <span class="keyword">template</span><<span class="keyword">typename</span> OutIt>
<a name="l00130"></a><a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a6a98cb189210aa45bea7414a64a3d0be">00130</a> <span class="keywordtype">void</span> <a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a506ee19056777786b25884008b384b72">process</a>(char_type c, OutIt& out)
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132 m_ch[m_cidx++] = c;
<a name="l00133"></a>00133 <span class="keywordflow">if</span>(m_cidx < 3)
<a name="l00134"></a>00134 <span class="keywordflow">return</span>;
<a name="l00135"></a>00135 writeBuf(out);
<a name="l00136"></a>00136 }<span class="comment"></span>
<a name="l00137"></a>00137 <span class="comment"> /*!</span>
<a name="l00138"></a>00138 <span class="comment"> Write to \p out any buffered encoded char.</span>
<a name="l00139"></a>00139 <span class="comment"> */</span>
<a name="l00140"></a>00140 <span class="keyword">template</span><<span class="keyword">typename</span> OutIt>
<a name="l00141"></a><a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a160ae5746b98a708fe90aa6a8110322a">00141</a> <span class="keywordtype">void</span> <a class="code" href="classmimetic_1_1Base64_1_1Encoder.html#a160ae5746b98a708fe90aa6a8110322a">flush</a>(OutIt& out)
<a name="l00142"></a>00142 {
<a name="l00143"></a>00143 <span class="keywordflow">if</span>(m_cidx > 0)
<a name="l00144"></a>00144 writeBuf(out);
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146 };
<a name="l00147"></a>00147 <span class="comment"></span>
<a name="l00148"></a>00148 <span class="comment">/// Base64 decoder</span>
<a name="l00149"></a>00149 <span class="comment"></span><span class="comment">/*!</span>
<a name="l00150"></a>00150 <span class="comment"></span>
<a name="l00151"></a>00151 <span class="comment"> \sa encode decode</span>
<a name="l00152"></a>00152 <span class="comment"> */</span>
<a name="l00153"></a><a class="code" href="classmimetic_1_1Base64_1_1Decoder.html">00153</a> <span class="keyword">class </span><a class="code" href="classmimetic_1_1Base64_1_1Decoder.html" title="Base64 decoder.">Decoder</a>: <span class="keyword">public</span> <a class="code" href="structmimetic_1_1buffered__codec.html" title="Base class for buffered codecs.">buffered_codec</a>, <span class="keyword">public</span> chainable_codec<Decoder>
<a name="l00154"></a>00154 {
<a name="l00155"></a>00155 <span class="keywordtype">int</span> m_cidx;
<a name="l00156"></a>00156 char_type m_ch[4];
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="keyword">template</span><<span class="keyword">typename</span> OutIt>
<a name="l00159"></a>00159 <span class="keyword">inline</span> <span class="keywordtype">void</span> writeBuf(OutIt& out)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 <span class="keywordflow">if</span>(m_cidx < 4)
<a name="l00162"></a>00162 { <span class="comment">// malformed, missing chars will be cosidered pad </span>
<a name="l00163"></a>00163 <span class="keywordflow">switch</span>(m_cidx)
<a name="l00164"></a>00164 {
<a name="l00165"></a>00165 <span class="keywordflow">case</span> 0:
<a name="l00166"></a>00166 <span class="keywordflow">case</span> 1:
<a name="l00167"></a>00167 <span class="keywordflow">return</span>; <span class="comment">// ignore;</span>
<a name="l00168"></a>00168 <span class="keywordflow">case</span> 2:
<a name="l00169"></a>00169 m_ch[2] = m_ch[3] = eq_sign;
<a name="l00170"></a>00170 <span class="keywordflow">break</span>;
<a name="l00171"></a>00171 <span class="keywordflow">case</span> 3:
<a name="l00172"></a>00172 m_ch[3] = eq_sign;
<a name="l00173"></a>00173 <span class="keywordflow">break</span>;
<a name="l00174"></a>00174 }
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176 m_cidx = 0;
<a name="l00177"></a>00177 *out = (m_ch[0] << 2 | ((m_ch[1] >> 4) & 0x3) ); ++out;
<a name="l00178"></a>00178 <span class="keywordflow">if</span>(m_ch[2] == eq_sign) <span class="keywordflow">return</span>;
<a name="l00179"></a>00179 *out = (m_ch[1] << 4 | ((m_ch[2] >> 2) & 0xF) ); ++out;
<a name="l00180"></a>00180 <span class="keywordflow">if</span>(m_ch[3] == eq_sign) <span class="keywordflow">return</span>;
<a name="l00181"></a>00181 *out = (m_ch[2] << 6 | m_ch[3]); ++out;
<a name="l00182"></a>00182 }
<a name="l00183"></a>00183 <span class="keyword">public</span>:<span class="comment"></span>
<a name="l00184"></a>00184 <span class="comment"> /*! Constructor */</span>
<a name="l00185"></a><a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#aedfa2b7d97ed17b14903ed75d6214c78">00185</a> <a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#aedfa2b7d97ed17b14903ed75d6214c78">Decoder</a>()
<a name="l00186"></a>00186 : m_cidx(0)
<a name="l00187"></a>00187 {
<a name="l00188"></a>00188 }<span class="comment"></span>
<a name="l00189"></a>00189 <span class="comment"> /*! Returns the name of the codec ("Base64") */</span>
<a name="l00190"></a><a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#a862958aa3c2b9bf36903f1f0f2e81c54">00190</a> <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#a862958aa3c2b9bf36903f1f0f2e81c54">name</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <span class="stringliteral">"Base64"</span>; }
<a name="l00191"></a>00191 <span class="comment"></span>
<a name="l00192"></a>00192 <span class="comment"> /*! </span>
<a name="l00193"></a>00193 <span class="comment"> Decodes [\p bit,\p eit) and write any decoded char to \p out.</span>
<a name="l00194"></a>00194 <span class="comment"> */</span>
<a name="l00195"></a>00195 <span class="keyword">template</span><<span class="keyword">typename</span> InIt, <span class="keyword">typename</span> OutIt>
<a name="l00196"></a><a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#a506ee19056777786b25884008b384b72">00196</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#a506ee19056777786b25884008b384b72">process</a>(InIt bit, InIt eit, OutIt out)
<a name="l00197"></a>00197 {
<a name="l00198"></a>00198 char_type c;
<a name="l00199"></a>00199
<a name="l00200"></a>00200 <span class="keywordflow">for</span>(; bit != eit; ++bit)
<a name="l00201"></a>00201 {
<a name="l00202"></a>00202 c = *bit;
<a name="l00203"></a>00203 <span class="keywordflow">if</span>(c > sDecTableSz || sDecTable[c] == -1)
<a name="l00204"></a>00204 <span class="keywordflow">continue</span>; <span class="comment">// malformed or newline</span>
<a name="l00205"></a>00205 m_ch[m_cidx++] = sDecTable[c];
<a name="l00206"></a>00206 <span class="keywordflow">if</span>(m_cidx < 4)
<a name="l00207"></a>00207 <span class="keywordflow">continue</span>;
<a name="l00208"></a>00208 writeBuf(out);
<a name="l00209"></a>00209 }
<a name="l00210"></a>00210 <span class="keywordflow">if</span>(m_cidx > 0)
<a name="l00211"></a>00211 writeBuf(out);
<a name="l00212"></a>00212 }<span class="comment"></span>
<a name="l00213"></a>00213 <span class="comment"> /*! </span>
<a name="l00214"></a>00214 <span class="comment"> Decodes \p c and write any decoded output char to \p out.</span>
<a name="l00215"></a>00215 <span class="comment"> </span>
<a name="l00216"></a>00216 <span class="comment"> \warning You must call flush() when all chars have been </span>
<a name="l00217"></a>00217 <span class="comment"> processed by the decode funcion.</span>
<a name="l00218"></a>00218 <span class="comment"> \n</span>
<a name="l00219"></a>00219 <span class="comment"> \code</span>
<a name="l00220"></a>00220 <span class="comment"> while( (c = getchar()) != EOF )</span>
<a name="l00221"></a>00221 <span class="comment"> b64.decode(c, out); </span>
<a name="l00222"></a>00222 <span class="comment"> b64.flush();</span>
<a name="l00223"></a>00223 <span class="comment"> \endcode</span>
<a name="l00224"></a>00224 <span class="comment"> \n</span>
<a name="l00225"></a>00225 <span class="comment"> \sa flush()</span>
<a name="l00226"></a>00226 <span class="comment"> */</span>
<a name="l00227"></a>00227 <span class="keyword">template</span><<span class="keyword">typename</span> OutIt>
<a name="l00228"></a><a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#a6a98cb189210aa45bea7414a64a3d0be">00228</a> <span class="keywordtype">void</span> <a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#a506ee19056777786b25884008b384b72">process</a>(char_type c, OutIt& out)
<a name="l00229"></a>00229 {
<a name="l00230"></a>00230 <span class="keywordflow">if</span>(c > sDecTableSz || sDecTable[c] == -1)
<a name="l00231"></a>00231 <span class="keywordflow">return</span>; <span class="comment">// malformed or newline</span>
<a name="l00232"></a>00232 m_ch[m_cidx++] = sDecTable[c];
<a name="l00233"></a>00233 <span class="keywordflow">if</span>(m_cidx < 4)
<a name="l00234"></a>00234 <span class="keywordflow">return</span>;
<a name="l00235"></a>00235 writeBuf(out);
<a name="l00236"></a>00236 }<span class="comment"></span>
<a name="l00237"></a>00237 <span class="comment"> /*!</span>
<a name="l00238"></a>00238 <span class="comment"> Write to \p out any buffered decoded char.</span>
<a name="l00239"></a>00239 <span class="comment"> */</span>
<a name="l00240"></a>00240 <span class="keyword">template</span><<span class="keyword">typename</span> OutIt>
<a name="l00241"></a><a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#a160ae5746b98a708fe90aa6a8110322a">00241</a> <span class="keywordtype">void</span> <a class="code" href="classmimetic_1_1Base64_1_1Decoder.html#a160ae5746b98a708fe90aa6a8110322a">flush</a>(OutIt& out)
<a name="l00242"></a>00242 {
<a name="l00243"></a>00243 <span class="keywordflow">if</span>(m_cidx > 0)
<a name="l00244"></a>00244 writeBuf(out);
<a name="l00245"></a>00245 }
<a name="l00246"></a>00246 };
<a name="l00247"></a>00247
<a name="l00248"></a>00248 }; <span class="comment">// Base64</span>
<a name="l00249"></a>00249
<a name="l00250"></a>00250 }
<a name="l00251"></a>00251 <span class="preprocessor">#endif</span>
<a name="l00252"></a>00252 <span class="preprocessor"></span>
</pre></div></div>
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