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<h1>base64.cc</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Encode or decode file as MIME base64 (RFC 1341)</span>
<a name="l00003"></a>00003 <span class="comment"> * Public domain by John Walker, August 11 1997</span>
<a name="l00004"></a>00004 <span class="comment"> * http://www.fourmilab.ch/</span>
<a name="l00005"></a>00005 <span class="comment"> * Modified slightly for the Citadel/UX system, June 1999</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Taken from the Citadel/UX GPL source tree, at version 6.01</span>
<a name="l00008"></a>00008 <span class="comment"> * Modified into a C++ API by Chris Frey for Net Direct Inc., November 2005</span>
<a name="l00009"></a>00009 <span class="comment"> * http://www.netdirect.ca/</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="preprocessor">#include "base64.h"</span>
<a name="l00014"></a>00014 <span class="preprocessor">#include <string></span>
<a name="l00015"></a>00015 <span class="preprocessor">#include <iterator></span>
<a name="l00016"></a>00016 <span class="preprocessor">#include <stdio.h></span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="preprocessor">#define TRUE 1</span>
<a name="l00019"></a>00019 <span class="preprocessor"></span><span class="preprocessor">#define FALSE 0</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span>
<a name="l00021"></a>00021 <span class="preprocessor">#define LINELEN 72 </span><span class="comment">/* Encoded line length (max 76) */</span>
<a name="l00022"></a>00022
<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>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="keyword">static</span> byte dtable[256]; <span class="comment">/* Encode / decode table */</span>
<a name="l00026"></a>00026 <span class="comment">//static char eol[] = "\r\n"; /* End of line sequence */</span>
<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>
<a name="l00028"></a>00028
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="comment">/* INCHAR -- Return next character from input */</span>
<a name="l00031"></a>00031
<a name="l00032"></a><a class="code" href="classbase64__input.html">00032</a> <span class="keyword">class </span><a class="code" href="classbase64__input.html">base64_input</a>
<a name="l00033"></a>00033 {
<a name="l00034"></a>00034 std::string::const_iterator begin, end;
<a name="l00035"></a>00035 <span class="keyword">public</span>:
<a name="l00036"></a>00036 <a class="code" href="classbase64__input.html">base64_input</a>(<span class="keyword">const</span> std::string &input)
<a name="l00037"></a>00037 : begin(input.begin()), end(input.end()) {}
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="keywordtype">int</span> operator()()
<a name="l00040"></a>00040 {
<a name="l00041"></a>00041 <span class="keywordflow">if</span> (begin == end) {
<a name="l00042"></a>00042 <span class="keywordflow">return</span> EOF;
<a name="l00043"></a>00043 }
<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++);
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046 };
<a name="l00047"></a>00047
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="comment">/* OCHAR -- Output an encoded character, inserting line breaks</span>
<a name="l00050"></a>00050 <span class="comment"> where required. */</span>
<a name="l00051"></a>00051
<a name="l00052"></a><a class="code" href="classbase64__output.html">00052</a> <span class="keyword">class </span><a class="code" href="classbase64__output.html">base64_output</a>
<a name="l00053"></a>00053 {
<a name="l00054"></a>00054 std::back_insert_iterator<std::string> insert;
<a name="l00055"></a>00055 <span class="keywordtype">int</span> linelength; <span class="comment">/* Length of encoded output line */</span>
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="keyword">public</span>:
<a name="l00058"></a>00058 <a class="code" href="classbase64__output.html">base64_output</a>(std::string &output)
<a name="l00059"></a>00059 : insert(back_inserter(output)),
<a name="l00060"></a>00060 linelength(0)
<a name="l00061"></a>00061 {}
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keywordtype">void</span> operator()(<span class="keywordtype">int</span> c)
<a name="l00064"></a>00064 {
<a name="l00065"></a>00065 <span class="keywordflow">if</span> (linelength >= LINELEN) {
<a name="l00066"></a>00066 *insert++ = <span class="charliteral">'\n'</span>;
<a name="l00067"></a>00067 *insert++ = <span class="charliteral">' '</span>;
<a name="l00068"></a>00068 linelength = 0;
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 *insert++ = (<span class="keywordtype">unsigned</span> char) c;
<a name="l00071"></a>00071 linelength++;
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073 };
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="comment">/* ENCODE -- Encode binary file into base64. */</span>
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="keyword">static</span> <span class="keywordtype">bool</span> encode(<a class="code" href="classbase64__input.html">base64_input</a> &inchar, <a class="code" href="classbase64__output.html">base64_output</a> &ochar)
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079 <span class="keywordtype">int</span> i, hiteof = FALSE;
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="comment">/* Fill dtable with character encodings. */</span>
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="keywordflow">for</span> (i = 0; i < 26; i++) {
<a name="l00084"></a>00084 dtable[i] = <span class="charliteral">'A'</span> + i;
<a name="l00085"></a>00085 dtable[26 + i] = <span class="charliteral">'a'</span> + i;
<a name="l00086"></a>00086 }
<a name="l00087"></a>00087 <span class="keywordflow">for</span> (i = 0; i < 10; i++) {
<a name="l00088"></a>00088 dtable[52 + i] = <span class="charliteral">'0'</span> + i;
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090 dtable[62] = <span class="charliteral">'+'</span>;
<a name="l00091"></a>00091 dtable[63] = <span class="charliteral">'/'</span>;
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keywordflow">while</span> (!hiteof) {
<a name="l00094"></a>00094 byte igroup[3], ogroup[4];
<a name="l00095"></a>00095 <span class="keywordtype">int</span> c, n;
<a name="l00096"></a>00096
<a name="l00097"></a>00097 igroup[0] = igroup[1] = igroup[2] = 0;
<a name="l00098"></a>00098 <span class="keywordflow">for</span> (n = 0; n < 3; n++) {
<a name="l00099"></a>00099 c = inchar();
<a name="l00100"></a>00100 <span class="keywordflow">if</span> (c == EOF) {
<a name="l00101"></a>00101 hiteof = TRUE;
<a name="l00102"></a>00102 <span class="keywordflow">break</span>;
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104 igroup[n] = (byte) c;
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106 <span class="keywordflow">if</span> (n > 0) {
<a name="l00107"></a>00107 ogroup[0] = dtable[igroup[0] >> 2];
<a name="l00108"></a>00108 ogroup[1] = dtable[((igroup[0] & 3) << 4) | (igroup[1] >> 4)];
<a name="l00109"></a>00109 ogroup[2] = dtable[((igroup[1] & 0xF) << 2) | (igroup[2] >> 6)];
<a name="l00110"></a>00110 ogroup[3] = dtable[igroup[2] & 0x3F];
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="comment">/* Replace characters in output stream with "=" pad</span>
<a name="l00113"></a>00113 <span class="comment"> characters if fewer than three characters were</span>
<a name="l00114"></a>00114 <span class="comment"> read from the end of the input stream. */</span>
<a name="l00115"></a>00115
<a name="l00116"></a>00116 <span class="keywordflow">if</span> (n < 3) {
<a name="l00117"></a>00117 ogroup[3] = <span class="charliteral">'='</span>;
<a name="l00118"></a>00118 <span class="keywordflow">if</span> (n < 2) {
<a name="l00119"></a>00119 ogroup[2] = <span class="charliteral">'='</span>;
<a name="l00120"></a>00120 }
<a name="l00121"></a>00121 }
<a name="l00122"></a>00122 <span class="keywordflow">for</span> (i = 0; i < 4; i++) {
<a name="l00123"></a>00123 ochar(ogroup[i]);
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126 }
<a name="l00127"></a>00127 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="comment">/* INSIG -- Return next significant input */</span>
<a name="l00131"></a>00131
<a name="l00132"></a>00132 <span class="keyword">static</span> <span class="keywordtype">int</span> insig(<a class="code" href="classbase64__input.html">base64_input</a> &inchar)
<a name="l00133"></a>00133 {
<a name="l00134"></a>00134 <span class="keywordtype">int</span> c;
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="comment">/*CONSTANTCONDITION*/</span>
<a name="l00137"></a>00137 <span class="keywordflow">while</span> (TRUE) {
<a name="l00138"></a>00138 c = inchar();
<a name="l00139"></a>00139 <span class="keywordflow">if</span> (c == EOF || (c > <span class="charliteral">' '</span>)) {
<a name="l00140"></a>00140 <span class="keywordflow">return</span> c;
<a name="l00141"></a>00141 }
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 <span class="comment">/*NOTREACHED*/</span>
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="comment">/* DECODE -- Decode base64. */</span>
<a name="l00147"></a>00147
<a name="l00148"></a>00148 <span class="keyword">static</span> <span class="keywordtype">bool</span> decode(<a class="code" href="classbase64__input.html">base64_input</a> &inchar, <a class="code" href="classbase64__output.html">base64_output</a> &ochar)
<a name="l00149"></a>00149 {
<a name="l00150"></a>00150 <span class="keywordtype">int</span> i;
<a name="l00151"></a>00151
<a name="l00152"></a>00152 <span class="keywordflow">for</span> (i = 0; i < 255; i++) {
<a name="l00153"></a>00153 dtable[i] = 0x80;
<a name="l00154"></a>00154 }
<a name="l00155"></a>00155 <span class="keywordflow">for</span> (i = <span class="charliteral">'A'</span>; i <= <span class="charliteral">'Z'</span>; i++) {
<a name="l00156"></a>00156 dtable[i] = 0 + (i - <span class="charliteral">'A'</span>);
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158 <span class="keywordflow">for</span> (i = <span class="charliteral">'a'</span>; i <= <span class="charliteral">'z'</span>; i++) {
<a name="l00159"></a>00159 dtable[i] = 26 + (i - <span class="charliteral">'a'</span>);
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161 <span class="keywordflow">for</span> (i = <span class="charliteral">'0'</span>; i <= <span class="charliteral">'9'</span>; i++) {
<a name="l00162"></a>00162 dtable[i] = 52 + (i - <span class="charliteral">'0'</span>);
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 dtable[(int)<span class="charliteral">'+'</span>] = 62;
<a name="l00165"></a>00165 dtable[(int)<span class="charliteral">'/'</span>] = 63;
<a name="l00166"></a>00166 dtable[(int)<span class="charliteral">'='</span>] = 0;
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="comment">/*CONSTANTCONDITION*/</span>
<a name="l00169"></a>00169 <span class="keywordflow">while</span> (TRUE) {
<a name="l00170"></a>00170 byte a[4], b[4], o[3];
<a name="l00171"></a>00171
<a name="l00172"></a>00172 <span class="keywordflow">for</span> (i = 0; i < 4; i++) {
<a name="l00173"></a>00173 <span class="keywordtype">int</span> c = insig(inchar);
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="keywordflow">if</span> (c == EOF) {
<a name="l00176"></a>00176 <span class="comment">// fprintf(stderr, "Input file incomplete.\n");</span>
<a name="l00177"></a>00177 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00178"></a>00178 }
<a name="l00179"></a>00179 <span class="keywordflow">if</span> (dtable[c] & 0x80) {
<a name="l00180"></a>00180 <span class="keywordflow">if</span> (errcheck) {
<a name="l00181"></a>00181 <span class="comment">//fprintf(stderr, "Illegal character '%c' in input file.\n", c);</span>
<a name="l00182"></a>00182 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00183"></a>00183 }
<a name="l00184"></a>00184 <span class="comment">/* Ignoring errors: discard invalid character. */</span>
<a name="l00185"></a>00185 i--;
<a name="l00186"></a>00186 <span class="keywordflow">continue</span>;
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188 a[i] = (byte) c;
<a name="l00189"></a>00189 b[i] = (byte) dtable[c];
<a name="l00190"></a>00190 }
<a name="l00191"></a>00191 o[0] = (b[0] << 2) | (b[1] >> 4);
<a name="l00192"></a>00192 o[1] = (b[1] << 4) | (b[2] >> 2);
<a name="l00193"></a>00193 o[2] = (b[2] << 6) | b[3];
<a name="l00194"></a>00194 i = a[2] == <span class="charliteral">'='</span> ? 1 : (a[3] == <span class="charliteral">'='</span> ? 2 : 3);
<a name="l00195"></a>00195 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> w = 0; w < i; w++ )
<a name="l00196"></a>00196 ochar(o[w]);
<a name="l00197"></a>00197 <span class="keywordflow">if</span> (i < 3) {
<a name="l00198"></a>00198 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201 }
<a name="l00202"></a>00202
<a name="l00203"></a>00203 <span class="comment">// in-memory encode / decode API</span>
<a name="l00204"></a>00204 <span class="keywordtype">bool</span> base64_encode(<span class="keyword">const</span> std::string &in, std::string &out)
<a name="l00205"></a>00205 {
<a name="l00206"></a>00206 out.clear();
<a name="l00207"></a>00207 <a class="code" href="classbase64__input.html">base64_input</a> input(in);
<a name="l00208"></a>00208 <a class="code" href="classbase64__output.html">base64_output</a> output(out);
<a name="l00209"></a>00209 <span class="keywordflow">return</span> encode(input, output);
<a name="l00210"></a>00210 }
<a name="l00211"></a>00211
<a name="l00212"></a>00212 <span class="keywordtype">bool</span> base64_decode(<span class="keyword">const</span> std::string &in, std::string &out)
<a name="l00213"></a>00213 {
<a name="l00214"></a>00214 out.clear();
<a name="l00215"></a>00215 <a class="code" href="classbase64__input.html">base64_input</a> input(in);
<a name="l00216"></a>00216 <a class="code" href="classbase64__output.html">base64_output</a> output(out);
<a name="l00217"></a>00217 <span class="keywordflow">return</span> decode(input, output);
<a name="l00218"></a>00218 }
<a name="l00219"></a>00219
<a name="l00220"></a>00220
<a name="l00221"></a>00221 <span class="preprocessor">#ifdef __TEST_MODE__</span>
<a name="l00222"></a>00222 <span class="preprocessor"></span>
<a name="l00223"></a>00223 <span class="preprocessor">#include <iostream></span>
<a name="l00224"></a>00224 <span class="keyword">using namespace </span>std;
<a name="l00225"></a>00225
<a name="l00226"></a>00226 <span class="comment">/* Main program */</span>
<a name="l00227"></a>00227
<a name="l00228"></a>00228 <span class="keywordtype">int</span> main()
<a name="l00229"></a>00229 {
<a name="l00230"></a>00230 <span class="keywordtype">string</span> test = <span class="stringliteral">"This is a test."</span>, encoded, decoded;
<a name="l00231"></a>00231 base64_encode(test, encoded);
<a name="l00232"></a>00232 base64_decode(encoded, decoded);
<a name="l00233"></a>00233 <span class="keywordflow">if</span>( test != decoded )
<a name="l00234"></a>00234 cerr << <span class="stringliteral">"Test failed"</span> << endl;
<a name="l00235"></a>00235 <span class="keywordflow">else</span>
<a name="l00236"></a>00236 cerr << <span class="stringliteral">"Success"</span> << endl;
<a name="l00237"></a>00237 }
<a name="l00238"></a>00238
<a name="l00239"></a>00239 <span class="preprocessor">#endif</span>
<a name="l00240"></a>00240 <span class="preprocessor"></span>
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