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<h2><a name="content"></a>libkmime</h2>
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<h1>kmime_codec_uuencode.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c++ -*-</span>
<a name="l00002"></a>00002 <span class="comment"> kmime_codec_uuencode.cpp</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment"> This file is part of KMime, the KDE internet mail/usenet news message library.</span>
<a name="l00005"></a>00005 <span class="comment"> Copyright (c) 2002 Marc Mutz <mutz@kde.org></span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment"> KMime is free software; you can redistribute it and/or modify it</span>
<a name="l00008"></a>00008 <span class="comment"> under the terms of the GNU General Public License, version 2, as</span>
<a name="l00009"></a>00009 <span class="comment"> published by the Free Software Foundation.</span>
<a name="l00010"></a>00010 <span class="comment"></span>
<a name="l00011"></a>00011 <span class="comment"> KMime is distributed in the hope that it will be useful, but</span>
<a name="l00012"></a>00012 <span class="comment"> WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00014"></a>00014 <span class="comment"> General Public License for more details.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment"> You should have received a copy of the GNU General Public License</span>
<a name="l00017"></a>00017 <span class="comment"> along with this library; if not, write to the Free Software</span>
<a name="l00018"></a>00018 <span class="comment"> Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment"> In addition, as a special exception, the copyright holders give</span>
<a name="l00021"></a>00021 <span class="comment"> permission to link the code of this library with any edition of</span>
<a name="l00022"></a>00022 <span class="comment"> the Qt library by Trolltech AS, Norway (or with modified versions</span>
<a name="l00023"></a>00023 <span class="comment"> of Qt that use the same license as Qt), and distribute linked</span>
<a name="l00024"></a>00024 <span class="comment"> combinations including the two. You must obey the GNU General</span>
<a name="l00025"></a>00025 <span class="comment"> Public License in all respects for all of the code used other than</span>
<a name="l00026"></a>00026 <span class="comment"> Qt. If you modify this file, you may extend this exception to</span>
<a name="l00027"></a>00027 <span class="comment"> your version of the file, but you are not obligated to do so. If</span>
<a name="l00028"></a>00028 <span class="comment"> you do not wish to do so, delete this exception statement from</span>
<a name="l00029"></a>00029 <span class="comment"> your version.</span>
<a name="l00030"></a>00030 <span class="comment">*/</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="preprocessor">#include "kmime_codec_uuencode.h"</span>
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="preprocessor">#include <kdebug.h></span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="preprocessor">#include <cassert></span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">using namespace </span>KMime;
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="keyword">namespace </span>KMime {
<a name="l00041"></a>00041
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="keyword">class </span>UUDecoder : <span class="keyword">public</span> <a class="code" href="classKMime_1_1Decoder.html" title="Stateful decoder class, modelled after QTextDecoder.">Decoder</a> {
<a name="l00044"></a>00044 uint mStepNo;
<a name="l00045"></a>00045 uchar mAnnouncedOctetCount; <span class="comment">// (on current line)</span>
<a name="l00046"></a>00046 uchar mCurrentOctetCount; <span class="comment">// (on current line)</span>
<a name="l00047"></a>00047 uchar mOutbits;
<a name="l00048"></a>00048 <span class="keywordtype">bool</span> mLastWasCRLF : 1;
<a name="l00049"></a>00049 <span class="keywordtype">bool</span> mSawBegin : 1; <span class="comment">// whether we already saw ^begin...</span>
<a name="l00050"></a>00050 uint mIntoBeginLine : 3; <span class="comment">// count #chars we compared against "begin" 0..5</span>
<a name="l00051"></a>00051 <span class="keywordtype">bool</span> mSawEnd : 1; <span class="comment">// whether we already saw ^end...</span>
<a name="l00052"></a>00052 uint mIntoEndLine : 2; <span class="comment">// count #chars we compared against "end" 0..3</span>
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keywordtype">void</span> searchForBegin( <span class="keyword">const</span> <span class="keywordtype">char</span>* & scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send );
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="keyword">protected</span>:
<a name="l00057"></a>00057 <span class="keyword">friend</span> <span class="keyword">class </span>UUCodec;
<a name="l00058"></a>00058 UUDecoder( <span class="keywordtype">bool</span> withCRLF=<span class="keyword">false</span> )
<a name="l00059"></a>00059 : <a class="code" href="classKMime_1_1Decoder.html" title="Stateful decoder class, modelled after QTextDecoder.">Decoder</a>( withCRLF ), mStepNo(0),
<a name="l00060"></a>00060 mAnnouncedOctetCount(0), mCurrentOctetCount(0),
<a name="l00061"></a>00061 mOutbits(0), mLastWasCRLF(true),
<a name="l00062"></a>00062 mSawBegin(false), mIntoBeginLine(0),
<a name="l00063"></a>00063 mSawEnd(false), mIntoEndLine(0) {}
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="keyword">public</span>:
<a name="l00066"></a>00066 <span class="keyword">virtual</span> ~UUDecoder() {}
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="keywordtype">bool</span> decode( <span class="keyword">const</span> <span class="keywordtype">char</span>* & scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send,
<a name="l00069"></a>00069 <span class="keywordtype">char</span>* & dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend );
<a name="l00070"></a>00070 <span class="comment">// ### really needs no finishing???</span>
<a name="l00071"></a>00071 <span class="keywordtype">bool</span> finish( <span class="keywordtype">char</span>* & <span class="comment">/*dcursor*/</span>, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> <span class="comment">/*dend*/</span> ) { <span class="keywordflow">return</span> <span class="keyword">true</span>; }
<a name="l00072"></a>00072 };
<a name="l00073"></a>00073
<a name="l00074"></a>00074
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <a class="code" href="classKMime_1_1Encoder.html" title="Stateful encoder class, modelled after QTextEncoder.">Encoder</a> * UUCodec::makeEncoder( <span class="keywordtype">bool</span> )<span class="keyword"> const </span>{
<a name="l00077"></a>00077 <span class="keywordflow">return</span> 0; <span class="comment">// encoding not supported</span>
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <a class="code" href="classKMime_1_1Decoder.html" title="Stateful decoder class, modelled after QTextDecoder.">Decoder</a> * UUCodec::makeDecoder( <span class="keywordtype">bool</span> withCRLF )<span class="keyword"> const </span>{
<a name="l00081"></a>00081 <span class="keywordflow">return</span> <span class="keyword">new</span> UUDecoder( withCRLF );
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="comment">/********************************************************/</span>
<a name="l00086"></a>00086 <span class="comment">/********************************************************/</span>
<a name="l00087"></a>00087 <span class="comment">/********************************************************/</span>
<a name="l00088"></a>00088
<a name="l00089"></a>00089
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="keywordtype">void</span> UUDecoder::searchForBegin( <span class="keyword">const</span> <span class="keywordtype">char</span>* & scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send ) {
<a name="l00092"></a>00092 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> begin[] = <span class="stringliteral">"begin\n"</span>;
<a name="l00093"></a>00093 <span class="keyword">static</span> <span class="keyword">const</span> uint beginLength = 5; <span class="comment">// sic!</span>
<a name="l00094"></a>00094
<a name="l00095"></a>00095 assert( !mSawBegin || mIntoBeginLine > 0 );
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="keywordflow">while</span> ( scursor != send ) {
<a name="l00098"></a>00098 uchar ch = *scursor++;
<a name="l00099"></a>00099 <span class="keywordflow">if</span> ( ch == begin[mIntoBeginLine] ) {
<a name="l00100"></a>00100 <span class="keywordflow">if</span> ( mIntoBeginLine < beginLength ) {
<a name="l00101"></a>00101 <span class="comment">// found another char</span>
<a name="l00102"></a>00102 ++mIntoBeginLine;
<a name="l00103"></a>00103 <span class="keywordflow">if</span> ( mIntoBeginLine == beginLength )
<a name="l00104"></a>00104 mSawBegin = <span class="keyword">true</span>; <span class="comment">// "begin" complete, now search the next \n...</span>
<a name="l00105"></a>00105 } <span class="keywordflow">else</span> <span class="comment">/* mIntoBeginLine == beginLength */</span> {
<a name="l00106"></a>00106 <span class="comment">// found '\n': begin line complete</span>
<a name="l00107"></a>00107 mLastWasCRLF = <span class="keyword">true</span>;
<a name="l00108"></a>00108 mIntoBeginLine = 0;
<a name="l00109"></a>00109 <span class="keywordflow">return</span>;
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( mSawBegin ) {
<a name="l00112"></a>00112 <span class="comment">// OK, skip stuff until the next \n</span>
<a name="l00113"></a>00113 } <span class="keywordflow">else</span> {
<a name="l00114"></a>00114 kdWarning() << <span class="stringliteral">"UUDecoder: garbage before \"begin\", resetting parser"</span>
<a name="l00115"></a>00115 << endl;
<a name="l00116"></a>00116 mIntoBeginLine = 0;
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119
<a name="l00120"></a>00120 }
<a name="l00121"></a>00121
<a name="l00122"></a>00122
<a name="l00123"></a>00123 <span class="comment">// uuencoding just shifts all 6-bit octets by 32 (SP/' '), except NUL,</span>
<a name="l00124"></a>00124 <span class="comment">// which gets mapped to 0x60</span>
<a name="l00125"></a>00125 <span class="keyword">static</span> <span class="keyword">inline</span> uchar uuDecode( uchar c ) {
<a name="l00126"></a>00126 <span class="keywordflow">return</span> ( c - <span class="charliteral">' '</span> ) <span class="comment">// undo shift and</span>
<a name="l00127"></a>00127 & 0x3F; <span class="comment">// map 0x40 (0x60-' ') to 0...</span>
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129
<a name="l00130"></a>00130
<a name="l00131"></a>00131 <span class="keywordtype">bool</span> <a class="code" href="classKMime_1_1Decoder.html#1991c45377e59be92f31284e473e3514" title="Decode a chunk of data, maintaining state information between calls.">UUDecoder::decode</a>( <span class="keyword">const</span> <span class="keywordtype">char</span>* & scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send,
<a name="l00132"></a>00132 <span class="keywordtype">char</span>* & dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend )
<a name="l00133"></a>00133 {
<a name="l00134"></a>00134 <span class="comment">// First, check whether we still need to find the "begin" line:</span>
<a name="l00135"></a>00135 <span class="keywordflow">if</span> ( !mSawBegin || mIntoBeginLine != 0 )
<a name="l00136"></a>00136 searchForBegin( scursor, send );
<a name="l00137"></a>00137 <span class="comment">// or if we are past the end line:</span>
<a name="l00138"></a>00138 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( mSawEnd ) {
<a name="l00139"></a>00139 scursor = send; <span class="comment">// do nothing anymore...</span>
<a name="l00140"></a>00140 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00141"></a>00141 }
<a name="l00142"></a>00142
<a name="l00143"></a>00143 <span class="keywordflow">while</span> ( dcursor != dend && scursor != send ) {
<a name="l00144"></a>00144 uchar ch = *scursor++;
<a name="l00145"></a>00145 uchar value;
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="comment">// Check whether we need to look for the "end" line:</span>
<a name="l00148"></a>00148 <span class="keywordflow">if</span> ( mIntoEndLine > 0 ) {
<a name="l00149"></a>00149 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> end[] = <span class="stringliteral">"end"</span>;
<a name="l00150"></a>00150 <span class="keyword">static</span> <span class="keyword">const</span> uint endLength = 3;
<a name="l00151"></a>00151
<a name="l00152"></a>00152 <span class="keywordflow">if</span> ( ch == end[mIntoEndLine] ) {
<a name="l00153"></a>00153 ++mIntoEndLine;
<a name="l00154"></a>00154 <span class="keywordflow">if</span> ( mIntoEndLine == endLength ) {
<a name="l00155"></a>00155 mSawEnd = <span class="keyword">true</span>;
<a name="l00156"></a>00156 scursor = send; <span class="comment">// shortcut to the end</span>
<a name="l00157"></a>00157 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 <span class="keywordflow">continue</span>;
<a name="l00160"></a>00160 } <span class="keywordflow">else</span> {
<a name="l00161"></a>00161 kdWarning() << <span class="stringliteral">"UUDecoder: invalid line octet count looks like \"end\" (mIntoEndLine = "</span> << mIntoEndLine << <span class="stringliteral">" )!"</span> << endl;
<a name="l00162"></a>00162 mIntoEndLine = 0;
<a name="l00163"></a>00163 <span class="comment">// fall through...</span>
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="comment">// Normal parsing:</span>
<a name="l00168"></a>00168
<a name="l00169"></a>00169 <span class="comment">// The first char of a line is an encoding of the length of the</span>
<a name="l00170"></a>00170 <span class="comment">// current line. We simply ignore it:</span>
<a name="l00171"></a>00171 <span class="keywordflow">if</span> ( mLastWasCRLF ) {
<a name="l00172"></a>00172 <span class="comment">// reset char-per-line counter:</span>
<a name="l00173"></a>00173 mLastWasCRLF = <span class="keyword">false</span>;
<a name="l00174"></a>00174 mCurrentOctetCount = 0;
<a name="l00175"></a>00175
<a name="l00176"></a>00176 <span class="comment">// try to decode the chars-on-this-line announcement:</span>
<a name="l00177"></a>00177 <span class="keywordflow">if</span> ( ch == <span class="charliteral">'e'</span> ) <span class="comment">// maybe the beginning of the "end"? ;-)</span>
<a name="l00178"></a>00178 mIntoEndLine = 1;
<a name="l00179"></a>00179 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch > 0x60 )
<a name="l00180"></a>00180 {} <span class="comment">// ### invalid line length char: what shall we do??</span>
<a name="l00181"></a>00181 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch > <span class="charliteral">' '</span> )
<a name="l00182"></a>00182 mAnnouncedOctetCount = uuDecode( ch );
<a name="l00183"></a>00183 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch == <span class="charliteral">'\n'</span> )
<a name="l00184"></a>00184 mLastWasCRLF = <span class="keyword">true</span>; <span class="comment">// oops, empty line</span>
<a name="l00185"></a>00185
<a name="l00186"></a>00186 <span class="keywordflow">continue</span>;
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188
<a name="l00189"></a>00189 <span class="comment">// try converting ch to a 6-bit value:</span>
<a name="l00190"></a>00190 <span class="keywordflow">if</span> ( ch > 0x60 )
<a name="l00191"></a>00191 <span class="keywordflow">continue</span>; <span class="comment">// invalid char</span>
<a name="l00192"></a>00192 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch > <span class="charliteral">' '</span> )
<a name="l00193"></a>00193 value = uuDecode( ch );
<a name="l00194"></a>00194 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch == <span class="charliteral">'\n'</span> ) { <span class="comment">// line end</span>
<a name="l00195"></a>00195 mLastWasCRLF = <span class="keyword">true</span>;
<a name="l00196"></a>00196 <span class="keywordflow">continue</span>;
<a name="l00197"></a>00197 } <span class="keywordflow">else</span>
<a name="l00198"></a>00198 <span class="keywordflow">continue</span>;
<a name="l00199"></a>00199
<a name="l00200"></a>00200 <span class="comment">// add the new bits to the output stream and flush full octets: </span>
<a name="l00201"></a>00201 <span class="keywordflow">switch</span> ( mStepNo ) {
<a name="l00202"></a>00202 <span class="keywordflow">case</span> 0:
<a name="l00203"></a>00203 mOutbits = value << 2;
<a name="l00204"></a>00204 <span class="keywordflow">break</span>;
<a name="l00205"></a>00205 <span class="keywordflow">case</span> 1:
<a name="l00206"></a>00206 <span class="keywordflow">if</span> ( mCurrentOctetCount < mAnnouncedOctetCount )
<a name="l00207"></a>00207 *dcursor++ = (char)(mOutbits | value >> 4);
<a name="l00208"></a>00208 ++mCurrentOctetCount;
<a name="l00209"></a>00209 mOutbits = value << 4;
<a name="l00210"></a>00210 <span class="keywordflow">break</span>;
<a name="l00211"></a>00211 <span class="keywordflow">case</span> 2:
<a name="l00212"></a>00212 <span class="keywordflow">if</span> ( mCurrentOctetCount < mAnnouncedOctetCount )
<a name="l00213"></a>00213 *dcursor++ = (char)(mOutbits | value >> 2);
<a name="l00214"></a>00214 ++mCurrentOctetCount;
<a name="l00215"></a>00215 mOutbits = value << 6;
<a name="l00216"></a>00216 <span class="keywordflow">break</span>;
<a name="l00217"></a>00217 <span class="keywordflow">case</span> 3:
<a name="l00218"></a>00218 <span class="keywordflow">if</span> ( mCurrentOctetCount < mAnnouncedOctetCount )
<a name="l00219"></a>00219 *dcursor++ = (char)(mOutbits | value);
<a name="l00220"></a>00220 ++mCurrentOctetCount;
<a name="l00221"></a>00221 mOutbits = 0;
<a name="l00222"></a>00222 <span class="keywordflow">break</span>;
<a name="l00223"></a>00223 <span class="keywordflow">default</span>:
<a name="l00224"></a>00224 assert( 0 );
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226 mStepNo = (mStepNo + 1) % 4;
<a name="l00227"></a>00227
<a name="l00228"></a>00228 <span class="comment">// check whether we ran over the announced octet count for this line:</span>
<a name="l00229"></a>00229 kdWarning( mCurrentOctetCount == mAnnouncedOctetCount + 1 )
<a name="l00230"></a>00230 << <span class="stringliteral">"UUDecoder: mismatch between announced ("</span>
<a name="l00231"></a>00231 << mAnnouncedOctetCount << <span class="stringliteral">") and actual line octet count!"</span> << endl;
<a name="l00232"></a>00232
<a name="l00233"></a>00233 }
<a name="l00234"></a>00234
<a name="l00235"></a>00235 <span class="comment">// return false when caller should call us again:</span>
<a name="l00236"></a>00236 <span class="keywordflow">return</span> (scursor == send);
<a name="l00237"></a>00237 } <span class="comment">// UUDecoder::decode()</span>
<a name="l00238"></a>00238
<a name="l00239"></a>00239
<a name="l00240"></a>00240 } <span class="comment">// namespace KMime</span>
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