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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>decodeRFC2047.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/***************************************************************************</span>
<a name="l00002"></a>00002 <span class="comment">                          decodeRFC2047.cpp  -  description</span>
<a name="l00003"></a>00003 <span class="comment">                             -------------------</span>
<a name="l00004"></a>00004 <span class="comment">    begin                : Mon Jan 28 2002</span>
<a name="l00005"></a>00005 <span class="comment">    copyright            : (C) 2002 by Eggert Ehmke</span>
<a name="l00006"></a>00006 <span class="comment">    email                : eggert.ehmke@berlin.de</span>
<a name="l00007"></a>00007 <span class="comment"> ***************************************************************************/</span>
<a name="l00008"></a>00008 
<a name="l00009"></a>00009 <span class="comment">/***************************************************************************</span>
<a name="l00010"></a>00010 <span class="comment"> *                                                                         *</span>
<a name="l00011"></a>00011 <span class="comment"> *   This program is free software; you can redistribute it and/or modify  *</span>
<a name="l00012"></a>00012 <span class="comment"> *   it under the terms of the GNU General Public License as published by  *</span>
<a name="l00013"></a>00013 <span class="comment"> *   the Free Software Foundation; either version 2 of the License, or     *</span>
<a name="l00014"></a>00014 <span class="comment"> *   (at your option) any later version.                                   *</span>
<a name="l00015"></a>00015 <span class="comment"> *                                                                         *</span>
<a name="l00016"></a>00016 <span class="comment"> ***************************************************************************/</span>
<a name="l00017"></a>00017 
<a name="l00018"></a>00018 
<a name="l00019"></a>00019 <span class="preprocessor">#include "decodeRFC2047.h"</span>
<a name="l00020"></a>00020 
<a name="l00021"></a>00021 <span class="comment">/*</span>
<a name="l00022"></a>00022 <span class="comment"> * These functions have been adapted from the KMail program</span>
<a name="l00023"></a>00023 <span class="comment"> */</span>
<a name="l00024"></a>00024 
<a name="l00025"></a>00025 TQCString decodeQuotedPrintable(<span class="keyword">const</span> TQCString&amp; aStr)
<a name="l00026"></a>00026 {
<a name="l00027"></a>00027   TQCString bStr = aStr;
<a name="l00028"></a>00028   <span class="keywordflow">if</span> (aStr.isNull())
<a name="l00029"></a>00029     bStr = <span class="stringliteral">""</span>;
<a name="l00030"></a>00030 
<a name="l00031"></a>00031   DwString dwsrc(bStr.data());
<a name="l00032"></a>00032   DwString dwdest;
<a name="l00033"></a>00033 
<a name="l00034"></a>00034   DwDecodeQuotedPrintable(dwsrc, dwdest);
<a name="l00035"></a>00035   <span class="keywordflow">return</span> dwdest.c_str();
<a name="l00036"></a>00036 }
<a name="l00037"></a>00037 
<a name="l00038"></a>00038 TQCString decodeBase64(<span class="keyword">const</span> TQCString&amp; aStr)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040   TQCString bStr = aStr;
<a name="l00041"></a>00041   <span class="keywordflow">if</span> (aStr.isNull())
<a name="l00042"></a>00042     bStr = <span class="stringliteral">""</span>;
<a name="l00043"></a>00043   <span class="keywordflow">while</span> (bStr.length() &lt; 16) bStr += <span class="stringliteral">"="</span>;
<a name="l00044"></a>00044 
<a name="l00045"></a>00045   DwString dwsrc(bStr.data(), bStr.length());
<a name="l00046"></a>00046   DwString dwdest;
<a name="l00047"></a>00047   TQCString result;
<a name="l00048"></a>00048 
<a name="l00049"></a>00049   DwDecodeBase64(dwsrc, dwdest);
<a name="l00050"></a>00050   result = dwdest.c_str();
<a name="l00051"></a>00051   <span class="keywordflow">return</span> result;
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053 
<a name="l00054"></a>00054 TQTextCodec* codecForName(<span class="keyword">const</span> TQCString&amp; _str)
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056   <span class="keywordflow">if</span> (_str.isEmpty()) <span class="keywordflow">return</span> NULL;
<a name="l00057"></a>00057   <span class="keywordflow">if</span> (_str.lower() == <span class="stringliteral">"shift_jis"</span> || _str.lower() == <span class="stringliteral">"shift-jis"</span>)
<a name="l00058"></a>00058     <span class="keywordflow">return</span> TQTextCodec::codecForName(<span class="stringliteral">"sjis"</span>);
<a name="l00059"></a>00059   <span class="keywordflow">return</span> TQTextCodec::codecForName(_str.lower().replace(
<a name="l00060"></a>00060     TQRegExp(<span class="stringliteral">"windows"</span>), <span class="stringliteral">"cp"</span>) );
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062 
<a name="l00063"></a><a class="code" href="namespaceCodecs.html#a0ef7c083708a464b1f1357ba5470cde">00063</a> TQString <a class="code" href="namespaceCodecs.html#a0ef7c083708a464b1f1357ba5470cde">Codecs::decodeRFC2047</a>(<span class="keyword">const</span> TQCString&amp; aStr)
<a name="l00064"></a>00064 {
<a name="l00065"></a>00065   TQString result;
<a name="l00066"></a>00066   TQCString charset;
<a name="l00067"></a>00067   <span class="keywordtype">char</span> *pos, *beg, *end, *mid;
<a name="l00068"></a>00068   TQCString str, cstr, LWSP_buffer;
<a name="l00069"></a>00069   <span class="keywordtype">char</span> encoding, ch;
<a name="l00070"></a>00070   <span class="keywordtype">bool</span> valid, lastWasEncodedWord=FALSE;
<a name="l00071"></a>00071   <span class="keyword">const</span> <span class="keywordtype">int</span> maxLen=200;
<a name="l00072"></a>00072   <span class="keywordtype">int</span> i;
<a name="l00073"></a>00073 
<a name="l00074"></a>00074   <span class="keywordflow">if</span> (aStr.find(<span class="stringliteral">"=?"</span>) &lt; 0)
<a name="l00075"></a>00075     <span class="keywordflow">return</span> TQString::fromLocal8Bit(aStr).replace(TQRegExp(<span class="stringliteral">"\n[\t ]"</span>),<span class="stringliteral">" "</span>);
<a name="l00076"></a>00076 
<a name="l00077"></a>00077   <span class="keywordflow">for</span> (pos=aStr.data(); *pos; pos++)
<a name="l00078"></a>00078   {
<a name="l00079"></a>00079     <span class="comment">// line unfolding</span>
<a name="l00080"></a>00080     <span class="keywordflow">if</span> ( pos[0] == <span class="charliteral">'\r'</span> &amp;&amp; pos[1] == <span class="charliteral">'\n'</span> ) {
<a name="l00081"></a>00081       pos++;
<a name="l00082"></a>00082       <span class="keywordflow">continue</span>;
<a name="l00083"></a>00083     }
<a name="l00084"></a>00084     <span class="keywordflow">if</span> ( pos[0] == <span class="charliteral">'\n'</span> )
<a name="l00085"></a>00085       <span class="keywordflow">continue</span>;
<a name="l00086"></a>00086     <span class="comment">// collect LWSP after encoded-words,</span>
<a name="l00087"></a>00087     <span class="comment">// because we might need to throw it out</span>
<a name="l00088"></a>00088     <span class="comment">// (when the next word is an encoded-word)</span>
<a name="l00089"></a>00089     <span class="keywordflow">if</span> ( lastWasEncodedWord &amp;&amp; ( pos[0] == <span class="charliteral">' '</span> || pos[0] == <span class="charliteral">'\t'</span> ) )
<a name="l00090"></a>00090     {
<a name="l00091"></a>00091       LWSP_buffer += pos[0];
<a name="l00092"></a>00092       <span class="keywordflow">continue</span>;
<a name="l00093"></a>00093     }
<a name="l00094"></a>00094     <span class="comment">// verbatimly copy normal text</span>
<a name="l00095"></a>00095     <span class="keywordflow">if</span> (pos[0]!=<span class="charliteral">'='</span> || pos[1]!=<span class="charliteral">'?'</span>)
<a name="l00096"></a>00096     {
<a name="l00097"></a>00097       result += LWSP_buffer + pos[0];
<a name="l00098"></a>00098       LWSP_buffer = 0;
<a name="l00099"></a>00099       lastWasEncodedWord = FALSE;
<a name="l00100"></a>00100       <span class="keywordflow">continue</span>;
<a name="l00101"></a>00101     }
<a name="l00102"></a>00102     <span class="comment">// found possible encoded-word</span>
<a name="l00103"></a>00103     beg = pos+2;
<a name="l00104"></a>00104     end = beg;
<a name="l00105"></a>00105     valid = TRUE;
<a name="l00106"></a>00106     <span class="comment">// parse charset name</span>
<a name="l00107"></a>00107     charset = <span class="stringliteral">""</span>;
<a name="l00108"></a>00108     <span class="keywordflow">for</span> (i=2,pos+=2; i&lt;maxLen &amp;&amp; (*pos!=<span class="charliteral">'?'</span>&amp;&amp;(*pos==<span class="charliteral">' '</span>||ispunct(*pos)||isalnum(*pos))); i++)
<a name="l00109"></a>00109     {
<a name="l00110"></a>00110       charset += *pos;
<a name="l00111"></a>00111       pos++;
<a name="l00112"></a>00112     }
<a name="l00113"></a>00113     <span class="keywordflow">if</span> (*pos!=<span class="charliteral">'?'</span> || i&lt;4 || i&gt;=maxLen) valid = FALSE;
<a name="l00114"></a>00114     <span class="keywordflow">else</span>
<a name="l00115"></a>00115     {
<a name="l00116"></a>00116       <span class="comment">// get encoding and check delimiting question marks</span>
<a name="l00117"></a>00117       encoding = toupper(pos[1]);
<a name="l00118"></a>00118       <span class="keywordflow">if</span> (pos[2]!=<span class="charliteral">'?'</span> || (encoding!=<span class="charliteral">'Q'</span> &amp;&amp; encoding!=<span class="charliteral">'B'</span>))
<a name="l00119"></a>00119                             valid = FALSE;
<a name="l00120"></a>00120       pos+=3;
<a name="l00121"></a>00121       i+=3;
<a name="l00122"></a>00122     }
<a name="l00123"></a>00123     <span class="keywordflow">if</span> (valid)
<a name="l00124"></a>00124     {
<a name="l00125"></a>00125       mid = pos;
<a name="l00126"></a>00126       <span class="comment">// search for end of encoded part</span>
<a name="l00127"></a>00127       <span class="keywordflow">while</span> (i&lt;maxLen &amp;&amp; *pos &amp;&amp; !(*pos==<span class="charliteral">'?'</span> &amp;&amp; *(pos+1)==<span class="charliteral">'='</span>))
<a name="l00128"></a>00128       {
<a name="l00129"></a>00129                             i++;
<a name="l00130"></a>00130                             pos++;
<a name="l00131"></a>00131       }
<a name="l00132"></a>00132       end = pos+2;<span class="comment">//end now points to the first char after the encoded string</span>
<a name="l00133"></a>00133       <span class="keywordflow">if</span> (i&gt;=maxLen || !*pos)
<a name="l00134"></a>00134        valid = FALSE;
<a name="l00135"></a>00135     }
<a name="l00136"></a>00136     <span class="keywordflow">if</span> (valid)
<a name="l00137"></a>00137     {
<a name="l00138"></a>00138       <span class="comment">// valid encoding: decode and throw away separating LWSP</span>
<a name="l00139"></a>00139       ch = *pos;
<a name="l00140"></a>00140       *pos = <span class="charliteral">'\0'</span>;
<a name="l00141"></a>00141       str = TQCString(mid).left((<span class="keywordtype">int</span>)(mid - pos - 1));
<a name="l00142"></a>00142       <span class="keywordflow">if</span> (encoding == <span class="charliteral">'Q'</span>)
<a name="l00143"></a>00143       {
<a name="l00144"></a>00144                             <span class="comment">// decode quoted printable text</span>
<a name="l00145"></a>00145                             <span class="keywordflow">for</span> (i=str.length()-1; i&gt;=0; i--)
<a name="l00146"></a>00146                      <span class="keywordflow">if</span> (str[i]==<span class="charliteral">'_'</span>)
<a name="l00147"></a>00147                             str[i]=<span class="charliteral">' '</span>;
<a name="l00148"></a>00148                             cstr = decodeQuotedPrintable(str);
<a name="l00149"></a>00149       }
<a name="l00150"></a>00150       <span class="keywordflow">else</span>
<a name="l00151"></a>00151       {
<a name="l00152"></a>00152                             <span class="comment">// decode base64 text</span>
<a name="l00153"></a>00153                             cstr = decodeBase64(str);
<a name="l00154"></a>00154       }
<a name="l00155"></a>00155       TQTextCodec *codec = codecForName(charset);
<a name="l00156"></a>00156       <span class="keywordflow">if</span> (!codec)
<a name="l00157"></a>00157        codec = codecForName(TDEGlobal::locale()-&gt;encoding());
<a name="l00158"></a>00158       <span class="keywordflow">if</span> (codec)
<a name="l00159"></a>00159        result += codec-&gt;toUnicode(cstr);
<a name="l00160"></a>00160       <span class="keywordflow">else</span>
<a name="l00161"></a>00161        result += TQString::fromLocal8Bit(cstr);
<a name="l00162"></a>00162       lastWasEncodedWord = TRUE;
<a name="l00163"></a>00163 
<a name="l00164"></a>00164       *pos = ch;
<a name="l00165"></a>00165       pos = end -1;
<a name="l00166"></a>00166     }
<a name="l00167"></a>00167     <span class="keywordflow">else</span>
<a name="l00168"></a>00168     {
<a name="l00169"></a>00169       <span class="comment">// invalid encoding, keep separating LWSP.</span>
<a name="l00170"></a>00170       <span class="comment">//result += "=?";</span>
<a name="l00171"></a>00171       <span class="comment">//pos = beg -1; // because pos gets increased shortly afterwards</span>
<a name="l00172"></a>00172       pos = beg - 2;
<a name="l00173"></a>00173       result += LWSP_buffer;
<a name="l00174"></a>00174       result += *pos++;
<a name="l00175"></a>00175       result += *pos;
<a name="l00176"></a>00176       lastWasEncodedWord = FALSE;
<a name="l00177"></a>00177     }
<a name="l00178"></a>00178     LWSP_buffer = 0;
<a name="l00179"></a>00179   }
<a name="l00180"></a>00180   <span class="keywordflow">return</span> result;
<a name="l00181"></a>00181 }
<a name="l00182"></a>00182 
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Jul 5 19:36:06 2007 for kshowmail by&nbsp;
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