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  23 <h1>base64.cc</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
  24 <a name="l00002"></a>00002 <span class="comment"> * Encode or decode file as MIME base64 (RFC 1341)</span>
  25 <a name="l00003"></a>00003 <span class="comment"> * Public domain by John Walker, August 11 1997</span>
  26 <a name="l00004"></a>00004 <span class="comment"> *           http://www.fourmilab.ch/</span>
  27 <a name="l00005"></a>00005 <span class="comment"> * Modified slightly for the Citadel/UX system, June 1999</span>
  28 <a name="l00006"></a>00006 <span class="comment"> *</span>
  29 <a name="l00007"></a>00007 <span class="comment"> * Taken from the Citadel/UX GPL source tree, at version 6.01</span>
  30 <a name="l00008"></a>00008 <span class="comment"> * Modified into a C++ API by Chris Frey for Net Direct Inc., November 2005</span>
  31 <a name="l00009"></a>00009 <span class="comment"> *           http://www.netdirect.ca/</span>
  32 <a name="l00010"></a>00010 <span class="comment"> *</span>
  33 <a name="l00011"></a>00011 <span class="comment"> */</span>
  34 <a name="l00012"></a>00012
  35 <a name="l00013"></a>00013 <span class="preprocessor">#include "base64.h"</span>
  36 <a name="l00014"></a>00014 <span class="preprocessor">#include &lt;string&gt;</span>
  37 <a name="l00015"></a>00015 <span class="preprocessor">#include &lt;iterator&gt;</span>
  38 <a name="l00016"></a>00016 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
  39 <a name="l00017"></a>00017
  40 <a name="l00018"></a>00018 <span class="preprocessor">#define TRUE  1</span>
  41 <a name="l00019"></a>00019 <span class="preprocessor"></span><span class="preprocessor">#define FALSE 0</span>
  42 <a name="l00020"></a>00020 <span class="preprocessor"></span>
  43 <a name="l00021"></a>00021 <span class="preprocessor">#define LINELEN 72                    </span><span class="comment">/* Encoded line length (max 76) */</span>
  44 <a name="l00022"></a>00022
  45 <a name="l00023"></a>00023 <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> byte;           <span class="comment">/* Byte type */</span>
  46 <a name="l00024"></a>00024
  47 <a name="l00025"></a>00025 <span class="keyword">static</span> byte dtable[256];              <span class="comment">/* Encode / decode table */</span>
  48 <a name="l00026"></a>00026 <span class="comment">//static char eol[] = "\r\n";           /* End of line sequence */</span>
  49 <a name="l00027"></a>00027 <span class="keyword">static</span> <span class="keywordtype">int</span> errcheck = TRUE;           <span class="comment">/* Check decode input for errors ? */</span>
  50 <a name="l00028"></a>00028
  51 <a name="l00029"></a>00029
  52 <a name="l00030"></a>00030 <span class="comment">/*  INCHAR  --  Return next character from input  */</span>
  53 <a name="l00031"></a>00031
  54 <a name="l00032"></a>00032 <span class="keyword">class </span>base64_input
  55 <a name="l00033"></a>00033 {
  56 <a name="l00034"></a>00034         std::string::const_iterator begin, end;
  57 <a name="l00035"></a>00035 <span class="keyword">public</span>:
  58 <a name="l00036"></a>00036         base64_input(<span class="keyword">const</span> std::string &amp;input)
  59 <a name="l00037"></a>00037                 : begin(input.begin()), end(input.end()) {}
  60 <a name="l00038"></a>00038
  61 <a name="l00039"></a>00039         <span class="keywordtype">int</span> operator()()
  62 <a name="l00040"></a>00040         {
  63 <a name="l00041"></a>00041                 <span class="keywordflow">if</span> (begin == end) {
  64 <a name="l00042"></a>00042                         <span class="keywordflow">return</span> EOF;
  65 <a name="l00043"></a>00043                 }
  66 <a name="l00044"></a>00044                 <span class="keywordflow">return</span> (<span class="keywordtype">int</span>)((<span class="keywordtype">unsigned</span> int)(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>) *begin++);
  67 <a name="l00045"></a>00045         }
  68 <a name="l00046"></a>00046 };
  69 <a name="l00047"></a>00047
  70 <a name="l00048"></a>00048
  71 <a name="l00049"></a>00049 <span class="comment">/*  OCHAR  --  Output an encoded character, inserting line breaks</span>
  72 <a name="l00050"></a>00050 <span class="comment">               where required.  */</span>
  73 <a name="l00051"></a>00051
  74 <a name="l00052"></a>00052 <span class="keyword">class </span>base64_output
  75 <a name="l00053"></a>00053 {
  76 <a name="l00054"></a>00054         std::back_insert_iterator&lt;std::string&gt; insert;
  77 <a name="l00055"></a>00055         <span class="keywordtype">int</span> linelength;                 <span class="comment">/* Length of encoded output line */</span>
  78 <a name="l00056"></a>00056
  79 <a name="l00057"></a>00057 <span class="keyword">public</span>:
  80 <a name="l00058"></a>00058         base64_output(std::string &amp;output)
  81 <a name="l00059"></a>00059                 : insert(back_inserter(output)),
  82 <a name="l00060"></a>00060                 linelength(0)
  83 <a name="l00061"></a>00061         {}
  84 <a name="l00062"></a>00062
  85 <a name="l00063"></a>00063         <span class="keywordtype">void</span> operator()(<span class="keywordtype">int</span> c)
  86 <a name="l00064"></a>00064         {
  87 <a name="l00065"></a>00065                 <span class="keywordflow">if</span> (linelength &gt;= LINELEN) {
  88 <a name="l00066"></a>00066                         *insert++ = <span class="charliteral">'\n'</span>;
  89 <a name="l00067"></a>00067                         *insert++ = <span class="charliteral">' '</span>;
  90 <a name="l00068"></a>00068                         linelength = 0;
  91 <a name="l00069"></a>00069                 }
  92 <a name="l00070"></a>00070                 *insert++ = (<span class="keywordtype">unsigned</span> char) c;
  93 <a name="l00071"></a>00071                 linelength++;
  94 <a name="l00072"></a>00072         }
  95 <a name="l00073"></a>00073 };
  96 <a name="l00074"></a>00074
  97 <a name="l00075"></a>00075 <span class="comment">/*  ENCODE  --  Encode binary file into base64.  */</span>
  98 <a name="l00076"></a>00076
  99 <a name="l00077"></a>00077 <span class="keyword">static</span> <span class="keywordtype">bool</span> encode(base64_input &amp;inchar, base64_output &amp;ochar)
 100 <a name="l00078"></a>00078 {
 101 <a name="l00079"></a>00079     <span class="keywordtype">int</span> i, hiteof = FALSE;
 102 <a name="l00080"></a>00080
 103 <a name="l00081"></a>00081     <span class="comment">/*  Fill dtable with character encodings.  */</span>
 104 <a name="l00082"></a>00082
 105 <a name="l00083"></a>00083     <span class="keywordflow">for</span> (i = 0; i &lt; 26; i++) {
 106 <a name="l00084"></a>00084         dtable[i] = <span class="charliteral">'A'</span> + i;
 107 <a name="l00085"></a>00085         dtable[26 + i] = <span class="charliteral">'a'</span> + i;
 108 <a name="l00086"></a>00086     }
 109 <a name="l00087"></a>00087     <span class="keywordflow">for</span> (i = 0; i &lt; 10; i++) {
 110 <a name="l00088"></a>00088         dtable[52 + i] = <span class="charliteral">'0'</span> + i;
 111 <a name="l00089"></a>00089     }
 112 <a name="l00090"></a>00090     dtable[62] = <span class="charliteral">'+'</span>;
 113 <a name="l00091"></a>00091     dtable[63] = <span class="charliteral">'/'</span>;
 114 <a name="l00092"></a>00092
 115 <a name="l00093"></a>00093     <span class="keywordflow">while</span> (!hiteof) {
 116 <a name="l00094"></a>00094         byte igroup[3], ogroup[4];
 117 <a name="l00095"></a>00095         <span class="keywordtype">int</span> c, n;
 118 <a name="l00096"></a>00096
 119 <a name="l00097"></a>00097         igroup[0] = igroup[1] = igroup[2] = 0;
 120 <a name="l00098"></a>00098         <span class="keywordflow">for</span> (n = 0; n &lt; 3; n++) {
 121 <a name="l00099"></a>00099             c = inchar();
 122 <a name="l00100"></a>00100             <span class="keywordflow">if</span> (c == EOF) {
 123 <a name="l00101"></a>00101                 hiteof = TRUE;
 124 <a name="l00102"></a>00102                 <span class="keywordflow">break</span>;
 125 <a name="l00103"></a>00103             }
 126 <a name="l00104"></a>00104             igroup[n] = (byte) c;
 127 <a name="l00105"></a>00105         }
 128 <a name="l00106"></a>00106         <span class="keywordflow">if</span> (n &gt; 0) {
 129 <a name="l00107"></a>00107             ogroup[0] = dtable[igroup[0] &gt;&gt; 2];
 130 <a name="l00108"></a>00108             ogroup[1] = dtable[((igroup[0] &amp; 3) &lt;&lt; 4) | (igroup[1] &gt;&gt; 4)];
 131 <a name="l00109"></a>00109             ogroup[2] = dtable[((igroup[1] &amp; 0xF) &lt;&lt; 2) | (igroup[2] &gt;&gt; 6)];
 132 <a name="l00110"></a>00110             ogroup[3] = dtable[igroup[2] &amp; 0x3F];
 133 <a name="l00111"></a>00111
 134 <a name="l00112"></a>00112             <span class="comment">/* Replace characters in output stream with "=" pad</span>
 135 <a name="l00113"></a>00113 <span class="comment">               characters if fewer than three characters were</span>
 136 <a name="l00114"></a>00114 <span class="comment">               read from the end of the input stream. */</span>
 137 <a name="l00115"></a>00115
 138 <a name="l00116"></a>00116             <span class="keywordflow">if</span> (n &lt; 3) {
 139 <a name="l00117"></a>00117                 ogroup[3] = <span class="charliteral">'='</span>;
 140 <a name="l00118"></a>00118                 <span class="keywordflow">if</span> (n &lt; 2) {
 141 <a name="l00119"></a>00119                     ogroup[2] = <span class="charliteral">'='</span>;
 142 <a name="l00120"></a>00120                 }
 143 <a name="l00121"></a>00121             }
 144 <a name="l00122"></a>00122             <span class="keywordflow">for</span> (i = 0; i &lt; 4; i++) {
 145 <a name="l00123"></a>00123                 ochar(ogroup[i]);
 146 <a name="l00124"></a>00124             }
 147 <a name="l00125"></a>00125         }
 148 <a name="l00126"></a>00126     }
 149 <a name="l00127"></a>00127     <span class="keywordflow">return</span> <span class="keyword">true</span>;
 150 <a name="l00128"></a>00128 }
 151 <a name="l00129"></a>00129
 152 <a name="l00130"></a>00130 <span class="comment">/*  INSIG  --  Return next significant input  */</span>
 153 <a name="l00131"></a>00131
 154 <a name="l00132"></a>00132 <span class="keyword">static</span> <span class="keywordtype">int</span> insig(base64_input &amp;inchar)
 155 <a name="l00133"></a>00133 {
 156 <a name="l00134"></a>00134     <span class="keywordtype">int</span> c;
 157 <a name="l00135"></a>00135
 158 <a name="l00136"></a>00136     <span class="comment">/*CONSTANTCONDITION*/</span>
 159 <a name="l00137"></a>00137     <span class="keywordflow">while</span> (TRUE) {
 160 <a name="l00138"></a>00138         c = inchar();
 161 <a name="l00139"></a>00139         <span class="keywordflow">if</span> (c == EOF || (c &gt; <span class="charliteral">' '</span>)) {
 162 <a name="l00140"></a>00140             <span class="keywordflow">return</span> c;
 163 <a name="l00141"></a>00141         }
 164 <a name="l00142"></a>00142     }
 165 <a name="l00143"></a>00143     <span class="comment">/*NOTREACHED*/</span>
 166 <a name="l00144"></a>00144 }
 167 <a name="l00145"></a>00145
 168 <a name="l00146"></a>00146 <span class="comment">/*  DECODE  --  Decode base64.  */</span>
 169 <a name="l00147"></a>00147
 170 <a name="l00148"></a>00148 <span class="keyword">static</span> <span class="keywordtype">bool</span> decode(base64_input &amp;inchar, base64_output &amp;ochar)
 171 <a name="l00149"></a>00149 {
 172 <a name="l00150"></a>00150     <span class="keywordtype">int</span> i;
 173 <a name="l00151"></a>00151
 174 <a name="l00152"></a>00152     <span class="keywordflow">for</span> (i = 0; i &lt; 255; i++) {
 175 <a name="l00153"></a>00153         dtable[i] = 0x80;
 176 <a name="l00154"></a>00154     }
 177 <a name="l00155"></a>00155     <span class="keywordflow">for</span> (i = <span class="charliteral">'A'</span>; i &lt;= <span class="charliteral">'Z'</span>; i++) {
 178 <a name="l00156"></a>00156         dtable[i] = 0 + (i - <span class="charliteral">'A'</span>);
 179 <a name="l00157"></a>00157     }
 180 <a name="l00158"></a>00158     <span class="keywordflow">for</span> (i = <span class="charliteral">'a'</span>; i &lt;= <span class="charliteral">'z'</span>; i++) {
 181 <a name="l00159"></a>00159         dtable[i] = 26 + (i - <span class="charliteral">'a'</span>);
 182 <a name="l00160"></a>00160     }
 183 <a name="l00161"></a>00161     <span class="keywordflow">for</span> (i = <span class="charliteral">'0'</span>; i &lt;= <span class="charliteral">'9'</span>; i++) {
 184 <a name="l00162"></a>00162         dtable[i] = 52 + (i - <span class="charliteral">'0'</span>);
 185 <a name="l00163"></a>00163     }
 186 <a name="l00164"></a>00164     dtable[(int)<span class="charliteral">'+'</span>] = 62;
 187 <a name="l00165"></a>00165     dtable[(int)<span class="charliteral">'/'</span>] = 63;
 188 <a name="l00166"></a>00166     dtable[(int)<span class="charliteral">'='</span>] = 0;
 189 <a name="l00167"></a>00167
 190 <a name="l00168"></a>00168     <span class="comment">/*CONSTANTCONDITION*/</span>
 191 <a name="l00169"></a>00169     <span class="keywordflow">while</span> (TRUE) {
 192 <a name="l00170"></a>00170         byte a[4], b[4], o[3];
 193 <a name="l00171"></a>00171
 194 <a name="l00172"></a>00172         <span class="keywordflow">for</span> (i = 0; i &lt; 4; i++) {
 195 <a name="l00173"></a>00173             <span class="keywordtype">int</span> c = insig(inchar);
 196 <a name="l00174"></a>00174
 197 <a name="l00175"></a>00175             <span class="keywordflow">if</span> (c == EOF) {
 198 <a name="l00176"></a>00176                 <span class="comment">// fprintf(stderr, "Input file incomplete.\n");</span>
 199 <a name="l00177"></a>00177                 <span class="keywordflow">return</span> <span class="keyword">false</span>;
 200 <a name="l00178"></a>00178             }
 201 <a name="l00179"></a>00179             <span class="keywordflow">if</span> (dtable[c] &amp; 0x80) {
 202 <a name="l00180"></a>00180                 <span class="keywordflow">if</span> (errcheck) {
 203 <a name="l00181"></a>00181                     <span class="comment">//fprintf(stderr, "Illegal character '%c' in input file.\n", c);</span>
 204 <a name="l00182"></a>00182                     <span class="keywordflow">return</span> <span class="keyword">false</span>;
 205 <a name="l00183"></a>00183                 }
 206 <a name="l00184"></a>00184                 <span class="comment">/* Ignoring errors: discard invalid character. */</span>
 207 <a name="l00185"></a>00185                 i--;
 208 <a name="l00186"></a>00186                 <span class="keywordflow">continue</span>;
 209 <a name="l00187"></a>00187             }
 210 <a name="l00188"></a>00188             a[i] = (byte) c;
 211 <a name="l00189"></a>00189             b[i] = (byte) dtable[c];
 212 <a name="l00190"></a>00190         }
 213 <a name="l00191"></a>00191         o[0] = (b[0] &lt;&lt; 2) | (b[1] &gt;&gt; 4);
 214 <a name="l00192"></a>00192         o[1] = (b[1] &lt;&lt; 4) | (b[2] &gt;&gt; 2);
 215 <a name="l00193"></a>00193         o[2] = (b[2] &lt;&lt; 6) | b[3];
 216 <a name="l00194"></a>00194         i = a[2] == <span class="charliteral">'='</span> ? 1 : (a[3] == <span class="charliteral">'='</span> ? 2 : 3);
 217 <a name="l00195"></a>00195         <span class="keywordflow">for</span> (<span class="keywordtype">int</span> w = 0; w &lt; i; w++ )
 218 <a name="l00196"></a>00196             ochar(o[w]);
 219 <a name="l00197"></a>00197         <span class="keywordflow">if</span> (i &lt; 3) {
 220 <a name="l00198"></a>00198             <span class="keywordflow">return</span> <span class="keyword">true</span>;
 221 <a name="l00199"></a>00199         }
 222 <a name="l00200"></a>00200     }
 223 <a name="l00201"></a>00201 }
 224 <a name="l00202"></a>00202
 225 <a name="l00203"></a>00203 <span class="comment">// in-memory encode / decode API</span>
 226 <a name="l00204"></a>00204 <span class="keywordtype">bool</span> base64_encode(<span class="keyword">const</span> std::string &amp;in, std::string &amp;out)
 227 <a name="l00205"></a>00205 {
 228 <a name="l00206"></a>00206         out.clear();
 229 <a name="l00207"></a>00207         base64_input input(in);
 230 <a name="l00208"></a>00208         base64_output output(out);
 231 <a name="l00209"></a>00209         <span class="keywordflow">return</span> encode(input, output);
 232 <a name="l00210"></a>00210 }
 233 <a name="l00211"></a>00211
 234 <a name="l00212"></a>00212 <span class="keywordtype">bool</span> base64_decode(<span class="keyword">const</span> std::string &amp;in, std::string &amp;out)
 235 <a name="l00213"></a>00213 {
 236 <a name="l00214"></a>00214         out.clear();
 237 <a name="l00215"></a>00215         base64_input input(in);
 238 <a name="l00216"></a>00216         base64_output output(out);
 239 <a name="l00217"></a>00217         <span class="keywordflow">return</span> decode(input, output);
 240 <a name="l00218"></a>00218 }
 241 <a name="l00219"></a>00219
 242 <a name="l00220"></a>00220
 243 <a name="l00221"></a>00221 <span class="preprocessor">#ifdef __TEST_MODE__</span>
 244 <a name="l00222"></a>00222 <span class="preprocessor"></span>
 245 <a name="l00223"></a>00223 <span class="preprocessor">#include &lt;iostream&gt;</span>
 246 <a name="l00224"></a>00224 <span class="keyword">using namespace </span>std;
 247 <a name="l00225"></a>00225
 248 <a name="l00226"></a>00226 <span class="comment">/*  Main program  */</span>
 249 <a name="l00227"></a>00227
 250 <a name="l00228"></a>00228 <span class="keywordtype">int</span> main()
 251 <a name="l00229"></a>00229 {
 252 <a name="l00230"></a>00230         <span class="keywordtype">string</span> test = <span class="stringliteral">"This is a test."</span>, encoded, decoded;
 253 <a name="l00231"></a>00231         base64_encode(test, encoded);
 254 <a name="l00232"></a>00232         base64_decode(encoded, decoded);
 255 <a name="l00233"></a>00233         <span class="keywordflow">if</span>( test != decoded )
 256 <a name="l00234"></a>00234                 cerr &lt;&lt; <span class="stringliteral">"Test failed"</span> &lt;&lt; endl;
 257 <a name="l00235"></a>00235         <span class="keywordflow">else</span>
 258 <a name="l00236"></a>00236                 cerr &lt;&lt; <span class="stringliteral">"Success"</span> &lt;&lt; endl;
 259 <a name="l00237"></a>00237 }
 260 <a name="l00238"></a>00238
 261 <a name="l00239"></a>00239 <span class="preprocessor">#endif</span>
 262 <a name="l00240"></a>00240 <span class="preprocessor"></span>
 263 </pre></div></div>
 264 <hr size="1"><address style="text-align: right;"><small>Generated on Thu Feb 10 16:13:57 2011 for Barry by&nbsp;
 265 <a href="http://www.doxygen.org/index.html">
 266 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
 267 </body>
 268 </html>