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<title>kshowmail: kshowmail/decodeRFC2047.cpp Source File</title>
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<a class="el" href="dir_656923b733374505e0e2f68ecb68d952.html">kshowmail</a></div>
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<h1>decodeRFC2047.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/***************************************************************************</span>
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<a name="l00002"></a>00002 <span class="comment"> decodeRFC2047.cpp - description</span>
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<a name="l00003"></a>00003 <span class="comment"> -------------------</span>
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<a name="l00004"></a>00004 <span class="comment"> begin : Mon Jan 28 2002</span>
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<a name="l00005"></a>00005 <span class="comment"> copyright : (C) 2002 by Eggert Ehmke</span>
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<a name="l00006"></a>00006 <span class="comment"> email : eggert.ehmke@berlin.de</span>
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<a name="l00007"></a>00007 <span class="comment"> ***************************************************************************/</span>
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<a name="l00008"></a>00008
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<a name="l00009"></a>00009 <span class="comment">/***************************************************************************</span>
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<a name="l00010"></a>00010 <span class="comment"> * *</span>
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<a name="l00011"></a>00011 <span class="comment"> * This program is free software; you can redistribute it and/or modify *</span>
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<a name="l00012"></a>00012 <span class="comment"> * it under the terms of the GNU General Public License as published by *</span>
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<a name="l00013"></a>00013 <span class="comment"> * the Free Software Foundation; either version 2 of the License, or *</span>
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<a name="l00014"></a>00014 <span class="comment"> * (at your option) any later version. *</span>
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<a name="l00015"></a>00015 <span class="comment"> * *</span>
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<a name="l00016"></a>00016 <span class="comment"> ***************************************************************************/</span>
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<a name="l00017"></a>00017
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<a name="l00018"></a>00018
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<a name="l00019"></a>00019 <span class="preprocessor">#include "decodeRFC2047.h"</span>
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<a name="l00020"></a>00020
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<a name="l00021"></a>00021 <span class="comment">/*</span>
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<a name="l00022"></a>00022 <span class="comment"> * These functions have been adapted from the KMail program</span>
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<a name="l00023"></a>00023 <span class="comment"> */</span>
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<a name="l00024"></a>00024
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<a name="l00025"></a>00025 TQCString decodeQuotedPrintable(<span class="keyword">const</span> TQCString& aStr)
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<a name="l00026"></a>00026 {
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<a name="l00027"></a>00027 TQCString bStr = aStr;
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<a name="l00028"></a>00028 <span class="keywordflow">if</span> (aStr.isNull())
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<a name="l00029"></a>00029 bStr = <span class="stringliteral">""</span>;
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<a name="l00030"></a>00030
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<a name="l00031"></a>00031 DwString dwsrc(bStr.data());
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<a name="l00032"></a>00032 DwString dwdest;
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<a name="l00033"></a>00033
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<a name="l00034"></a>00034 DwDecodeQuotedPrintable(dwsrc, dwdest);
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<a name="l00035"></a>00035 <span class="keywordflow">return</span> dwdest.c_str();
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<a name="l00036"></a>00036 }
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<a name="l00037"></a>00037
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<a name="l00038"></a>00038 TQCString decodeBase64(<span class="keyword">const</span> TQCString& aStr)
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<a name="l00039"></a>00039 {
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<a name="l00040"></a>00040 TQCString bStr = aStr;
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<a name="l00041"></a>00041 <span class="keywordflow">if</span> (aStr.isNull())
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<a name="l00042"></a>00042 bStr = <span class="stringliteral">""</span>;
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<a name="l00043"></a>00043 <span class="keywordflow">while</span> (bStr.length() < 16) bStr += <span class="stringliteral">"="</span>;
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<a name="l00044"></a>00044
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<a name="l00045"></a>00045 DwString dwsrc(bStr.data(), bStr.length());
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<a name="l00046"></a>00046 DwString dwdest;
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<a name="l00047"></a>00047 TQCString result;
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<a name="l00048"></a>00048
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<a name="l00049"></a>00049 DwDecodeBase64(dwsrc, dwdest);
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<a name="l00050"></a>00050 result = dwdest.c_str();
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<a name="l00051"></a>00051 <span class="keywordflow">return</span> result;
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<a name="l00052"></a>00052 }
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<a name="l00053"></a>00053
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<a name="l00054"></a>00054 TQTextCodec* codecForName(<span class="keyword">const</span> TQCString& _str)
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<a name="l00055"></a>00055 {
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<a name="l00056"></a>00056 <span class="keywordflow">if</span> (_str.isEmpty()) <span class="keywordflow">return</span> NULL;
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<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>)
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<a name="l00058"></a>00058 <span class="keywordflow">return</span> TQTextCodec::codecForName(<span class="stringliteral">"sjis"</span>);
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<a name="l00059"></a>00059 <span class="keywordflow">return</span> TQTextCodec::codecForName(_str.lower().replace(
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<a name="l00060"></a>00060 TQRegExp(<span class="stringliteral">"windows"</span>), <span class="stringliteral">"cp"</span>) );
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<a name="l00061"></a>00061 }
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<a name="l00062"></a>00062
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<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& aStr)
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<a name="l00064"></a>00064 {
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<a name="l00065"></a>00065 TQString result;
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<a name="l00066"></a>00066 TQCString charset;
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<a name="l00067"></a>00067 <span class="keywordtype">char</span> *pos, *beg, *end, *mid;
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<a name="l00068"></a>00068 TQCString str, cstr, LWSP_buffer;
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<a name="l00069"></a>00069 <span class="keywordtype">char</span> encoding, ch;
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<a name="l00070"></a>00070 <span class="keywordtype">bool</span> valid, lastWasEncodedWord=FALSE;
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<a name="l00071"></a>00071 <span class="keyword">const</span> <span class="keywordtype">int</span> maxLen=200;
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<a name="l00072"></a>00072 <span class="keywordtype">int</span> i;
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<a name="l00073"></a>00073
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<a name="l00074"></a>00074 <span class="keywordflow">if</span> (aStr.find(<span class="stringliteral">"=?"</span>) < 0)
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<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>);
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<a name="l00076"></a>00076
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<a name="l00077"></a>00077 <span class="keywordflow">for</span> (pos=aStr.data(); *pos; pos++)
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<a name="l00078"></a>00078 {
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<a name="l00079"></a>00079 <span class="comment">// line unfolding</span>
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<a name="l00080"></a>00080 <span class="keywordflow">if</span> ( pos[0] == <span class="charliteral">'\r'</span> && pos[1] == <span class="charliteral">'\n'</span> ) {
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<a name="l00081"></a>00081 pos++;
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<a name="l00082"></a>00082 <span class="keywordflow">continue</span>;
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<a name="l00083"></a>00083 }
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<a name="l00084"></a>00084 <span class="keywordflow">if</span> ( pos[0] == <span class="charliteral">'\n'</span> )
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<a name="l00085"></a>00085 <span class="keywordflow">continue</span>;
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<a name="l00086"></a>00086 <span class="comment">// collect LWSP after encoded-words,</span>
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<a name="l00087"></a>00087 <span class="comment">// because we might need to throw it out</span>
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<a name="l00088"></a>00088 <span class="comment">// (when the next word is an encoded-word)</span>
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<a name="l00089"></a>00089 <span class="keywordflow">if</span> ( lastWasEncodedWord && ( pos[0] == <span class="charliteral">' '</span> || pos[0] == <span class="charliteral">'\t'</span> ) )
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<a name="l00090"></a>00090 {
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<a name="l00091"></a>00091 LWSP_buffer += pos[0];
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<a name="l00092"></a>00092 <span class="keywordflow">continue</span>;
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<a name="l00093"></a>00093 }
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<a name="l00094"></a>00094 <span class="comment">// verbatimly copy normal text</span>
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<a name="l00095"></a>00095 <span class="keywordflow">if</span> (pos[0]!=<span class="charliteral">'='</span> || pos[1]!=<span class="charliteral">'?'</span>)
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<a name="l00096"></a>00096 {
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<a name="l00097"></a>00097 result += LWSP_buffer + pos[0];
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<a name="l00098"></a>00098 LWSP_buffer = 0;
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<a name="l00099"></a>00099 lastWasEncodedWord = FALSE;
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<a name="l00100"></a>00100 <span class="keywordflow">continue</span>;
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<a name="l00101"></a>00101 }
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<a name="l00102"></a>00102 <span class="comment">// found possible encoded-word</span>
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<a name="l00103"></a>00103 beg = pos+2;
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<a name="l00104"></a>00104 end = beg;
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<a name="l00105"></a>00105 valid = TRUE;
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<a name="l00106"></a>00106 <span class="comment">// parse charset name</span>
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<a name="l00107"></a>00107 charset = <span class="stringliteral">""</span>;
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<a name="l00108"></a>00108 <span class="keywordflow">for</span> (i=2,pos+=2; i<maxLen && (*pos!=<span class="charliteral">'?'</span>&&(*pos==<span class="charliteral">' '</span>||ispunct(*pos)||isalnum(*pos))); i++)
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<a name="l00109"></a>00109 {
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<a name="l00110"></a>00110 charset += *pos;
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<a name="l00111"></a>00111 pos++;
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<a name="l00112"></a>00112 }
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<a name="l00113"></a>00113 <span class="keywordflow">if</span> (*pos!=<span class="charliteral">'?'</span> || i<4 || i>=maxLen) valid = FALSE;
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<a name="l00114"></a>00114 <span class="keywordflow">else</span>
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<a name="l00115"></a>00115 {
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<a name="l00116"></a>00116 <span class="comment">// get encoding and check delimiting question marks</span>
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<a name="l00117"></a>00117 encoding = toupper(pos[1]);
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<a name="l00118"></a>00118 <span class="keywordflow">if</span> (pos[2]!=<span class="charliteral">'?'</span> || (encoding!=<span class="charliteral">'Q'</span> && encoding!=<span class="charliteral">'B'</span>))
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<a name="l00119"></a>00119 valid = FALSE;
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<a name="l00120"></a>00120 pos+=3;
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<a name="l00121"></a>00121 i+=3;
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<a name="l00122"></a>00122 }
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<a name="l00123"></a>00123 <span class="keywordflow">if</span> (valid)
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<a name="l00124"></a>00124 {
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<a name="l00125"></a>00125 mid = pos;
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<a name="l00126"></a>00126 <span class="comment">// search for end of encoded part</span>
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<a name="l00127"></a>00127 <span class="keywordflow">while</span> (i<maxLen && *pos && !(*pos==<span class="charliteral">'?'</span> && *(pos+1)==<span class="charliteral">'='</span>))
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<a name="l00128"></a>00128 {
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<a name="l00129"></a>00129 i++;
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<a name="l00130"></a>00130 pos++;
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<a name="l00131"></a>00131 }
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<a name="l00132"></a>00132 end = pos+2;<span class="comment">//end now points to the first char after the encoded string</span>
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<a name="l00133"></a>00133 <span class="keywordflow">if</span> (i>=maxLen || !*pos)
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<a name="l00134"></a>00134 valid = FALSE;
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<a name="l00135"></a>00135 }
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<a name="l00136"></a>00136 <span class="keywordflow">if</span> (valid)
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<a name="l00137"></a>00137 {
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<a name="l00138"></a>00138 <span class="comment">// valid encoding: decode and throw away separating LWSP</span>
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<a name="l00139"></a>00139 ch = *pos;
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<a name="l00140"></a>00140 *pos = <span class="charliteral">'\0'</span>;
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<a name="l00141"></a>00141 str = TQCString(mid).left((<span class="keywordtype">int</span>)(mid - pos - 1));
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<a name="l00142"></a>00142 <span class="keywordflow">if</span> (encoding == <span class="charliteral">'Q'</span>)
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<a name="l00143"></a>00143 {
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<a name="l00144"></a>00144 <span class="comment">// decode quoted printable text</span>
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<a name="l00145"></a>00145 <span class="keywordflow">for</span> (i=str.length()-1; i>=0; i--)
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<a name="l00146"></a>00146 <span class="keywordflow">if</span> (str[i]==<span class="charliteral">'_'</span>)
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<a name="l00147"></a>00147 str[i]=<span class="charliteral">' '</span>;
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<a name="l00148"></a>00148 cstr = decodeQuotedPrintable(str);
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<a name="l00149"></a>00149 }
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<a name="l00150"></a>00150 <span class="keywordflow">else</span>
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<a name="l00151"></a>00151 {
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<a name="l00152"></a>00152 <span class="comment">// decode base64 text</span>
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<a name="l00153"></a>00153 cstr = decodeBase64(str);
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<a name="l00154"></a>00154 }
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<a name="l00155"></a>00155 TQTextCodec *codec = codecForName(charset);
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<a name="l00156"></a>00156 <span class="keywordflow">if</span> (!codec)
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<a name="l00157"></a>00157 codec = codecForName(TDEGlobal::locale()->encoding());
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<a name="l00158"></a>00158 <span class="keywordflow">if</span> (codec)
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<a name="l00159"></a>00159 result += codec->toUnicode(cstr);
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<a name="l00160"></a>00160 <span class="keywordflow">else</span>
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<a name="l00161"></a>00161 result += TQString::fromLocal8Bit(cstr);
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<a name="l00162"></a>00162 lastWasEncodedWord = TRUE;
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<a name="l00163"></a>00163
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<a name="l00164"></a>00164 *pos = ch;
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<a name="l00165"></a>00165 pos = end -1;
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<a name="l00166"></a>00166 }
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<a name="l00167"></a>00167 <span class="keywordflow">else</span>
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<a name="l00168"></a>00168 {
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<a name="l00169"></a>00169 <span class="comment">// invalid encoding, keep separating LWSP.</span>
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<a name="l00170"></a>00170 <span class="comment">//result += "=?";</span>
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<a name="l00171"></a>00171 <span class="comment">//pos = beg -1; // because pos gets increased shortly afterwards</span>
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<a name="l00172"></a>00172 pos = beg - 2;
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<a name="l00173"></a>00173 result += LWSP_buffer;
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<a name="l00174"></a>00174 result += *pos++;
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<a name="l00175"></a>00175 result += *pos;
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<a name="l00176"></a>00176 lastWasEncodedWord = FALSE;
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<a name="l00177"></a>00177 }
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<a name="l00178"></a>00178 LWSP_buffer = 0;
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<a name="l00179"></a>00179 }
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<a name="l00180"></a>00180 <span class="keywordflow">return</span> result;
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<a name="l00181"></a>00181 }
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<a name="l00182"></a>00182
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</pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Jul 5 19:36:06 2007 for kshowmail by
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.0 </small></address>
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