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    <h2><a name="content"></a>libkmime</h2>


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<h1>kmime_codec_base64.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_base64.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) 2001 Marc Mutz &lt;mutz@kde.org&gt;</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_base64.h"</span>
<a name="l00033"></a>00033 
<a name="l00034"></a>00034 <span class="preprocessor">#include &lt;kdebug.h&gt;</span>
<a name="l00035"></a>00035 
<a name="l00036"></a>00036 <span class="preprocessor">#include &lt;cassert&gt;</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 <span class="comment">// codec for base64 as specified in RFC 2045</span>
<a name="l00043"></a>00043   <span class="comment">//class Base64Codec;</span>
<a name="l00044"></a>00044   <span class="comment">//class Base64Decoder;</span>
<a name="l00045"></a>00045   <span class="comment">//class Base64Encoder;</span>
<a name="l00046"></a>00046 
<a name="l00047"></a>00047 <span class="comment">// codec for the B encoding as specified in RFC 2047</span>
<a name="l00048"></a>00048   <span class="comment">//class Rfc2047BEncodingCodec;</span>
<a name="l00049"></a>00049   <span class="comment">//class Rfc2047BEncodingEncoder;</span>
<a name="l00050"></a>00050   <span class="comment">//class Rfc2047BEncodingDecoder;</span>
<a name="l00051"></a>00051 
<a name="l00052"></a>00052 
<a name="l00053"></a>00053 <span class="keyword">static</span> <span class="keyword">const</span> uchar base64DecodeMap[128] = {
<a name="l00054"></a>00054   64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
<a name="l00055"></a>00055   64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
<a name="l00056"></a>00056   
<a name="l00057"></a>00057   64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 62, 64, 64, 64, 63,
<a name="l00058"></a>00058   52, 53, 54, 55, 56, 57, 58, 59,  60, 61, 64, 64, 64, 64, 64, 64,
<a name="l00059"></a>00059   
<a name="l00060"></a>00060   64,  0,  1,  2,  3,  4,  5,  6,   7,  8,  9, 10, 11, 12, 13, 14,
<a name="l00061"></a>00061   15, 16, 17, 18, 19, 20, 21, 22,  23, 24, 25, 64, 64, 64, 64, 64,
<a name="l00062"></a>00062   
<a name="l00063"></a>00063   64, 26, 27, 28, 29, 30, 31, 32,  33, 34, 35, 36, 37, 38, 39, 40,
<a name="l00064"></a>00064   41, 42, 43, 44, 45, 46, 47, 48,  49, 50, 51, 64, 64, 64, 64, 64
<a name="l00065"></a>00065 };
<a name="l00066"></a>00066 
<a name="l00067"></a>00067 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> base64EncodeMap[64] = {
<a name="l00068"></a>00068   <span class="charliteral">'A'</span>, <span class="charliteral">'B'</span>, <span class="charliteral">'C'</span>, <span class="charliteral">'D'</span>, <span class="charliteral">'E'</span>, <span class="charliteral">'F'</span>, <span class="charliteral">'G'</span>, <span class="charliteral">'H'</span>,
<a name="l00069"></a>00069   <span class="charliteral">'I'</span>, <span class="charliteral">'J'</span>, <span class="charliteral">'K'</span>, <span class="charliteral">'L'</span>, <span class="charliteral">'M'</span>, <span class="charliteral">'N'</span>, <span class="charliteral">'O'</span>, <span class="charliteral">'P'</span>,
<a name="l00070"></a>00070   <span class="charliteral">'Q'</span>, <span class="charliteral">'R'</span>, <span class="charliteral">'S'</span>, <span class="charliteral">'T'</span>, <span class="charliteral">'U'</span>, <span class="charliteral">'V'</span>, <span class="charliteral">'W'</span>, <span class="charliteral">'X'</span>,
<a name="l00071"></a>00071   <span class="charliteral">'Y'</span>, <span class="charliteral">'Z'</span>, <span class="charliteral">'a'</span>, <span class="charliteral">'b'</span>, <span class="charliteral">'c'</span>, <span class="charliteral">'d'</span>, <span class="charliteral">'e'</span>, <span class="charliteral">'f'</span>,
<a name="l00072"></a>00072   <span class="charliteral">'g'</span>, <span class="charliteral">'h'</span>, <span class="charliteral">'i'</span>, <span class="charliteral">'j'</span>, <span class="charliteral">'k'</span>, <span class="charliteral">'l'</span>, <span class="charliteral">'m'</span>, <span class="charliteral">'n'</span>,
<a name="l00073"></a>00073   <span class="charliteral">'o'</span>, <span class="charliteral">'p'</span>, <span class="charliteral">'q'</span>, <span class="charliteral">'r'</span>, <span class="charliteral">'s'</span>, <span class="charliteral">'t'</span>, <span class="charliteral">'u'</span>, <span class="charliteral">'v'</span>,
<a name="l00074"></a>00074   <span class="charliteral">'w'</span>, <span class="charliteral">'x'</span>, <span class="charliteral">'y'</span>, <span class="charliteral">'z'</span>, <span class="charliteral">'0'</span>, <span class="charliteral">'1'</span>, <span class="charliteral">'2'</span>, <span class="charliteral">'3'</span>,
<a name="l00075"></a>00075   <span class="charliteral">'4'</span>, <span class="charliteral">'5'</span>, <span class="charliteral">'6'</span>, <span class="charliteral">'7'</span>, <span class="charliteral">'8'</span>, <span class="charliteral">'9'</span>, <span class="charliteral">'+'</span>, <span class="charliteral">'/'</span>
<a name="l00076"></a>00076 };
<a name="l00077"></a>00077 
<a name="l00078"></a>00078 
<a name="l00079"></a>00079 <span class="keyword">class </span>Base64Decoder : <span class="keyword">public</span> <a class="code" href="classKMime_1_1Decoder.html" title="Stateful decoder class, modelled after QTextDecoder.">Decoder</a> {
<a name="l00080"></a>00080   uint mStepNo;
<a name="l00081"></a>00081   uchar mOutbits;
<a name="l00082"></a>00082   <span class="keywordtype">bool</span> mSawPadding : 1;
<a name="l00083"></a>00083 
<a name="l00084"></a>00084 <span class="keyword">protected</span>:
<a name="l00085"></a>00085   <span class="keyword">friend</span> <span class="keyword">class </span>Base64Codec;
<a name="l00086"></a>00086   Base64Decoder( <span class="keywordtype">bool</span> withCRLF=<span class="keyword">false</span> )
<a name="l00087"></a>00087     : <a class="code" href="classKMime_1_1Decoder.html" title="Stateful decoder class, modelled after QTextDecoder.">Decoder</a>( withCRLF ), mStepNo(0), mOutbits(0),
<a name="l00088"></a>00088       mSawPadding(false) {}
<a name="l00089"></a>00089 
<a name="l00090"></a>00090 <span class="keyword">public</span>:
<a name="l00091"></a>00091   <span class="keyword">virtual</span> ~Base64Decoder() {}
<a name="l00092"></a>00092 
<a name="l00093"></a>00093   <span class="keywordtype">bool</span> decode( <span class="keyword">const</span> <span class="keywordtype">char</span>* &amp; scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send,
<a name="l00094"></a>00094            <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend );
<a name="l00095"></a>00095   <span class="comment">// ### really needs no finishing???</span>
<a name="l00096"></a>00096   <span class="keywordtype">bool</span> finish( <span class="keywordtype">char</span>* &amp; <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="l00097"></a>00097 };
<a name="l00098"></a>00098 
<a name="l00099"></a>00099 
<a name="l00100"></a>00100 
<a name="l00101"></a>00101 <span class="keyword">class </span>Base64Encoder : <span class="keyword">public</span> <a class="code" href="classKMime_1_1Encoder.html" title="Stateful encoder class, modelled after QTextEncoder.">Encoder</a> {
<a name="l00102"></a>00102   uint mStepNo;
<a name="l00104"></a>00104   uint mWrittenPacketsOnThisLine;
<a name="l00105"></a>00105   uchar mNextbits;
<a name="l00106"></a>00106   <span class="keywordtype">bool</span> mInsideFinishing : 1;
<a name="l00107"></a>00107 
<a name="l00108"></a>00108 <span class="keyword">protected</span>:
<a name="l00109"></a>00109   <span class="keyword">friend</span> <span class="keyword">class </span>Rfc2047BEncodingCodec;
<a name="l00110"></a>00110   <span class="keyword">friend</span> <span class="keyword">class </span>Rfc2047BEncodingEncoder;
<a name="l00111"></a>00111   <span class="keyword">friend</span> <span class="keyword">class </span>Base64Codec;
<a name="l00112"></a>00112   Base64Encoder( <span class="keywordtype">bool</span> withCRLF=<span class="keyword">false</span> )
<a name="l00113"></a>00113     : <a class="code" href="classKMime_1_1Encoder.html" title="Stateful encoder class, modelled after QTextEncoder.">Encoder</a>( withCRLF ), mStepNo(0), mWrittenPacketsOnThisLine(0),
<a name="l00114"></a>00114       mNextbits(0), mInsideFinishing(false) {}
<a name="l00115"></a>00115 
<a name="l00116"></a>00116   <span class="keywordtype">bool</span> generic_finish( <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend,
<a name="l00117"></a>00117                <span class="keywordtype">bool</span> withLFatEnd );
<a name="l00118"></a>00118 
<a name="l00119"></a>00119 <span class="keyword">public</span>:
<a name="l00120"></a>00120   <span class="keyword">virtual</span> ~Base64Encoder() {}
<a name="l00121"></a>00121 
<a name="l00122"></a>00122   <span class="keywordtype">bool</span> encode( <span class="keyword">const</span> <span class="keywordtype">char</span>* &amp; scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send,
<a name="l00123"></a>00123            <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend );
<a name="l00124"></a>00124 
<a name="l00125"></a>00125   <span class="keywordtype">bool</span> finish( <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend );
<a name="l00126"></a>00126 
<a name="l00127"></a>00127 <span class="keyword">protected</span>:
<a name="l00128"></a>00128   <span class="keywordtype">bool</span> writeBase64( uchar ch, <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend ) {
<a name="l00129"></a>00129     <span class="keywordflow">return</span> <a class="code" href="classKMime_1_1Encoder.html#4273a7e52f4fa2a22f64770b6145b4b7" title="Writes ch to the output stream or the output buffer, depending on whether or not...">write</a>( base64EncodeMap[ ch ], dcursor, dend );
<a name="l00130"></a>00130   }
<a name="l00131"></a>00131 };
<a name="l00132"></a>00132 
<a name="l00133"></a>00133 
<a name="l00134"></a>00134 
<a name="l00135"></a>00135 <span class="keyword">class </span>Rfc2047BEncodingEncoder : <span class="keyword">public</span> Base64Encoder {
<a name="l00136"></a>00136 <span class="keyword">protected</span>:
<a name="l00137"></a>00137   <span class="keyword">friend</span> <span class="keyword">class </span>Rfc2047BEncodingCodec;
<a name="l00138"></a>00138   Rfc2047BEncodingEncoder( <span class="keywordtype">bool</span> withCRLF=<span class="keyword">false</span> )
<a name="l00139"></a>00139     : Base64Encoder( withCRLF ) {};
<a name="l00140"></a>00140 <span class="keyword">public</span>:
<a name="l00141"></a>00141   <span class="keywordtype">bool</span> encode( <span class="keyword">const</span> <span class="keywordtype">char</span>* &amp; scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send,
<a name="l00142"></a>00142            <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend );
<a name="l00143"></a>00143   <span class="keywordtype">bool</span> finish( <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend );
<a name="l00144"></a>00144 };
<a name="l00145"></a>00145 
<a name="l00146"></a>00146 
<a name="l00147"></a>00147 <a class="code" href="classKMime_1_1Encoder.html" title="Stateful encoder class, modelled after QTextEncoder.">Encoder</a> * Base64Codec::makeEncoder( <span class="keywordtype">bool</span> withCRLF )<span class="keyword"> const </span>{
<a name="l00148"></a>00148   <span class="keywordflow">return</span> <span class="keyword">new</span> Base64Encoder( withCRLF );
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150 
<a name="l00151"></a>00151 <a class="code" href="classKMime_1_1Decoder.html" title="Stateful decoder class, modelled after QTextDecoder.">Decoder</a> * Base64Codec::makeDecoder( <span class="keywordtype">bool</span> withCRLF )<span class="keyword"> const </span>{
<a name="l00152"></a>00152   <span class="keywordflow">return</span> <span class="keyword">new</span> Base64Decoder( withCRLF );
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154 
<a name="l00155"></a>00155 <a class="code" href="classKMime_1_1Encoder.html" title="Stateful encoder class, modelled after QTextEncoder.">Encoder</a> * Rfc2047BEncodingCodec::makeEncoder( <span class="keywordtype">bool</span> withCRLF )<span class="keyword"> const </span>{
<a name="l00156"></a>00156   <span class="keywordflow">return</span> <span class="keyword">new</span> Rfc2047BEncodingEncoder( withCRLF );
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158 
<a name="l00159"></a>00159   <span class="comment">/********************************************************/</span>
<a name="l00160"></a>00160   <span class="comment">/********************************************************/</span>
<a name="l00161"></a>00161   <span class="comment">/********************************************************/</span>
<a name="l00162"></a>00162 
<a name="l00163"></a>00163 
<a name="l00164"></a>00164 <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.">Base64Decoder::decode</a>( <span class="keyword">const</span> <span class="keywordtype">char</span>* &amp; scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send,
<a name="l00165"></a>00165                 <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend )
<a name="l00166"></a>00166 {
<a name="l00167"></a>00167   <span class="keywordflow">while</span> ( dcursor != dend &amp;&amp; scursor != send ) {
<a name="l00168"></a>00168     uchar ch = *scursor++;
<a name="l00169"></a>00169     uchar value;
<a name="l00170"></a>00170 
<a name="l00171"></a>00171     <span class="comment">// try converting ch to a 6-bit value:</span>
<a name="l00172"></a>00172     <span class="keywordflow">if</span> ( ch &lt; 128 )
<a name="l00173"></a>00173       value = base64DecodeMap[ ch ];
<a name="l00174"></a>00174     <span class="keywordflow">else</span>
<a name="l00175"></a>00175       value = 64;
<a name="l00176"></a>00176 
<a name="l00177"></a>00177     <span class="comment">// ch isn't of the base64 alphabet, check for other significant chars:</span>
<a name="l00178"></a>00178     <span class="keywordflow">if</span> ( value &gt;= 64 ) {
<a name="l00179"></a>00179       <span class="keywordflow">if</span> ( ch == <span class="charliteral">'='</span> ) {
<a name="l00180"></a>00180     <span class="comment">// padding:</span>
<a name="l00181"></a>00181     <span class="keywordflow">if</span> ( mStepNo == 0 || mStepNo == 1) {
<a name="l00182"></a>00182       <span class="keywordflow">if</span> (!mSawPadding) {
<a name="l00183"></a>00183         <span class="comment">// malformed</span>
<a name="l00184"></a>00184         kdWarning() &lt;&lt; <span class="stringliteral">"Base64Decoder: unexpected padding "</span>
<a name="l00185"></a>00185           <span class="stringliteral">"character in input stream"</span> &lt;&lt; endl;
<a name="l00186"></a>00186       }
<a name="l00187"></a>00187       mSawPadding = <span class="keyword">true</span>;
<a name="l00188"></a>00188       <span class="keywordflow">break</span>;
<a name="l00189"></a>00189     } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( mStepNo == 2 ) {
<a name="l00190"></a>00190       <span class="comment">// ok, there should be another one</span>
<a name="l00191"></a>00191     } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( mStepNo == 3 ) {
<a name="l00192"></a>00192       <span class="comment">// ok, end of encoded stream</span>
<a name="l00193"></a>00193       mSawPadding = <span class="keyword">true</span>;
<a name="l00194"></a>00194       <span class="keywordflow">break</span>;
<a name="l00195"></a>00195     }
<a name="l00196"></a>00196     mSawPadding = <span class="keyword">true</span>;
<a name="l00197"></a>00197     mStepNo = (mStepNo + 1) % 4;
<a name="l00198"></a>00198     <span class="keywordflow">continue</span>;
<a name="l00199"></a>00199       } <span class="keywordflow">else</span> {
<a name="l00200"></a>00200     <span class="comment">// non-base64 alphabet</span>
<a name="l00201"></a>00201     <span class="keywordflow">continue</span>;
<a name="l00202"></a>00202       }
<a name="l00203"></a>00203     }
<a name="l00204"></a>00204 
<a name="l00205"></a>00205     <span class="keywordflow">if</span> ( mSawPadding ) {
<a name="l00206"></a>00206       kdWarning() &lt;&lt; <span class="stringliteral">"Base64Decoder: Embedded padding character "</span>
<a name="l00207"></a>00207     <span class="stringliteral">"encountered!"</span> &lt;&lt; endl;
<a name="l00208"></a>00208       <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00209"></a>00209     }
<a name="l00210"></a>00210 
<a name="l00211"></a>00211     <span class="comment">// add the new bits to the output stream and flush full octets:    </span>
<a name="l00212"></a>00212     <span class="keywordflow">switch</span> ( mStepNo ) {
<a name="l00213"></a>00213     <span class="keywordflow">case</span> 0:
<a name="l00214"></a>00214       mOutbits = value &lt;&lt; 2;
<a name="l00215"></a>00215       <span class="keywordflow">break</span>;
<a name="l00216"></a>00216     <span class="keywordflow">case</span> 1:
<a name="l00217"></a>00217       *dcursor++ = (char)(mOutbits | value &gt;&gt; 4);
<a name="l00218"></a>00218       mOutbits = value &lt;&lt; 4;
<a name="l00219"></a>00219       <span class="keywordflow">break</span>;
<a name="l00220"></a>00220     <span class="keywordflow">case</span> 2:
<a name="l00221"></a>00221       *dcursor++ = (char)(mOutbits | value &gt;&gt; 2);
<a name="l00222"></a>00222       mOutbits = value &lt;&lt; 6;
<a name="l00223"></a>00223       <span class="keywordflow">break</span>;
<a name="l00224"></a>00224     <span class="keywordflow">case</span> 3:
<a name="l00225"></a>00225       *dcursor++ = (char)(mOutbits | value);
<a name="l00226"></a>00226       mOutbits = 0;
<a name="l00227"></a>00227       <span class="keywordflow">break</span>;
<a name="l00228"></a>00228     <span class="keywordflow">default</span>:
<a name="l00229"></a>00229       assert( 0 );
<a name="l00230"></a>00230     }
<a name="l00231"></a>00231     mStepNo = (mStepNo + 1) % 4;
<a name="l00232"></a>00232   }
<a name="l00233"></a>00233 
<a name="l00234"></a>00234   <span class="comment">// return false when caller should call us again:</span>
<a name="l00235"></a>00235   <span class="keywordflow">return</span> (scursor == send);
<a name="l00236"></a>00236 } <span class="comment">// Base64Decoder::decode()</span>
<a name="l00237"></a>00237 
<a name="l00238"></a>00238 
<a name="l00239"></a>00239 
<a name="l00240"></a>00240 <span class="keywordtype">bool</span> <a class="code" href="classKMime_1_1Encoder.html#aa2eefa0dbf49272c1ec09b8a4b99ae9" title="Encode a chunk of data, maintaining state information between calls.">Base64Encoder::encode</a>( <span class="keyword">const</span> <span class="keywordtype">char</span>* &amp; scursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send,
<a name="l00241"></a>00241                 <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend ) {
<a name="l00242"></a>00242   <span class="keyword">const</span> uint maxPacketsPerLine = 76 / 4;
<a name="l00243"></a>00243 
<a name="l00244"></a>00244   <span class="comment">// detect when the caller doesn't adhere to our rules:</span>
<a name="l00245"></a>00245   <span class="keywordflow">if</span> ( mInsideFinishing ) <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00246"></a>00246 
<a name="l00247"></a>00247   <span class="keywordflow">while</span> ( scursor != send &amp;&amp; dcursor != dend ) {
<a name="l00248"></a>00248     <span class="comment">// properly empty the output buffer before starting something new:</span>
<a name="l00249"></a>00249     <span class="comment">// ### fixme: we can optimize this away, since the buffer isn't</span>
<a name="l00250"></a>00250     <span class="comment">// written to anyway (most of the time)</span>
<a name="l00251"></a>00251     <span class="keywordflow">if</span> ( mOutputBufferCursor &amp;&amp; !flushOutputBuffer( dcursor, dend ) )
<a name="l00252"></a>00252       <span class="keywordflow">return</span> (scursor == send);
<a name="l00253"></a>00253 
<a name="l00254"></a>00254     uchar ch = *scursor++;
<a name="l00255"></a>00255     <span class="comment">// mNextbits   // (part of) value of next sextet</span>
<a name="l00256"></a>00256 
<a name="l00257"></a>00257     <span class="comment">// check for line length;</span>
<a name="l00258"></a>00258     <span class="keywordflow">if</span> ( mStepNo == 0 &amp;&amp; mWrittenPacketsOnThisLine &gt;= maxPacketsPerLine ) {
<a name="l00259"></a>00259       writeCRLF( dcursor, dend );
<a name="l00260"></a>00260       mWrittenPacketsOnThisLine = 0;
<a name="l00261"></a>00261     }
<a name="l00262"></a>00262 
<a name="l00263"></a>00263     <span class="comment">// depending on mStepNo, extract value and mNextbits from the</span>
<a name="l00264"></a>00264     <span class="comment">// octet stream:</span>
<a name="l00265"></a>00265     <span class="keywordflow">switch</span> ( mStepNo ) {
<a name="l00266"></a>00266     <span class="keywordflow">case</span> 0:
<a name="l00267"></a>00267       assert( mNextbits == 0 );
<a name="l00268"></a>00268       writeBase64( ch &gt;&gt; 2, dcursor, dend ); <span class="comment">// top-most 6 bits -&gt; output</span>
<a name="l00269"></a>00269       mNextbits = (ch &amp; 0x3) &lt;&lt; 4; <span class="comment">// 0..1 bits -&gt; 4..5 in mNextbits</span>
<a name="l00270"></a>00270       <span class="keywordflow">break</span>;
<a name="l00271"></a>00271     <span class="keywordflow">case</span> 1:
<a name="l00272"></a>00272       assert( (mNextbits &amp; ~0x30) == 0 );
<a name="l00273"></a>00273       writeBase64( mNextbits | ch &gt;&gt; 4, dcursor, dend ); <span class="comment">// 4..7 bits -&gt; 0..3 in value</span>
<a name="l00274"></a>00274       mNextbits = (ch &amp; 0xf) &lt;&lt; 2; <span class="comment">// 0..3 bits -&gt; 2..5 in mNextbits</span>
<a name="l00275"></a>00275       <span class="keywordflow">break</span>;
<a name="l00276"></a>00276     <span class="keywordflow">case</span> 2:
<a name="l00277"></a>00277       assert( (mNextbits &amp; ~0x3C) == 0 );
<a name="l00278"></a>00278       writeBase64( mNextbits | ch &gt;&gt; 6, dcursor, dend ); <span class="comment">// 6..7 bits -&gt; 0..1 in value</span>
<a name="l00279"></a>00279       writeBase64( ch &amp; 0x3F, dcursor, dend ); <span class="comment">// 0..5 bits -&gt; output</span>
<a name="l00280"></a>00280       mNextbits = 0;
<a name="l00281"></a>00281       mWrittenPacketsOnThisLine++;
<a name="l00282"></a>00282       <span class="keywordflow">break</span>;
<a name="l00283"></a>00283     <span class="keywordflow">default</span>:
<a name="l00284"></a>00284       assert( 0 );
<a name="l00285"></a>00285     }
<a name="l00286"></a>00286     mStepNo = ( mStepNo + 1 ) % 3;
<a name="l00287"></a>00287   }
<a name="l00288"></a>00288 
<a name="l00289"></a>00289   <span class="keywordflow">if</span> ( mOutputBufferCursor ) flushOutputBuffer( dcursor, dend );
<a name="l00290"></a>00290 
<a name="l00291"></a>00291   <span class="keywordflow">return</span> (scursor == send);
<a name="l00292"></a>00292 }
<a name="l00293"></a>00293 
<a name="l00294"></a>00294 
<a name="l00295"></a>00295 <span class="keywordtype">bool</span> Rfc2047BEncodingEncoder::encode( <span class="keyword">const</span> <span class="keywordtype">char</span>* &amp; scursor,
<a name="l00296"></a>00296                       <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> send,
<a name="l00297"></a>00297                       <span class="keywordtype">char</span>* &amp; dcursor,
<a name="l00298"></a>00298                       <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend )
<a name="l00299"></a>00299 {
<a name="l00300"></a>00300   <span class="comment">// detect when the caller doesn't adhere to our rules:</span>
<a name="l00301"></a>00301   <span class="keywordflow">if</span> ( mInsideFinishing ) <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00302"></a>00302 
<a name="l00303"></a>00303   <span class="keywordflow">while</span> ( scursor != send &amp;&amp; dcursor != dend ) {
<a name="l00304"></a>00304     <span class="comment">// properly empty the output buffer before starting something new:</span>
<a name="l00305"></a>00305     <span class="comment">// ### fixme: we can optimize this away, since the buffer isn't</span>
<a name="l00306"></a>00306     <span class="comment">// written to anyway (most of the time)</span>
<a name="l00307"></a>00307     <span class="keywordflow">if</span> ( mOutputBufferCursor &amp;&amp; !flushOutputBuffer( dcursor, dend ) )
<a name="l00308"></a>00308       <span class="keywordflow">return</span> (scursor == send);
<a name="l00309"></a>00309 
<a name="l00310"></a>00310     uchar ch = *scursor++;
<a name="l00311"></a>00311     <span class="comment">// mNextbits   // (part of) value of next sextet</span>
<a name="l00312"></a>00312 
<a name="l00313"></a>00313     <span class="comment">// depending on mStepNo, extract value and mNextbits from the</span>
<a name="l00314"></a>00314     <span class="comment">// octet stream:</span>
<a name="l00315"></a>00315     <span class="keywordflow">switch</span> ( mStepNo ) {
<a name="l00316"></a>00316     <span class="keywordflow">case</span> 0:
<a name="l00317"></a>00317       assert( mNextbits == 0 );
<a name="l00318"></a>00318       writeBase64( ch &gt;&gt; 2, dcursor, dend ); <span class="comment">// top-most 6 bits -&gt; output</span>
<a name="l00319"></a>00319       mNextbits = (ch &amp; 0x3) &lt;&lt; 4; <span class="comment">// 0..1 bits -&gt; 4..5 in mNextbits</span>
<a name="l00320"></a>00320       <span class="keywordflow">break</span>;
<a name="l00321"></a>00321     <span class="keywordflow">case</span> 1:
<a name="l00322"></a>00322       assert( (mNextbits &amp; ~0x30) == 0 );
<a name="l00323"></a>00323       writeBase64( mNextbits | ch &gt;&gt; 4, dcursor, dend ); <span class="comment">// 4..7 bits -&gt; 0..3 in value</span>
<a name="l00324"></a>00324       mNextbits = (ch &amp; 0xf) &lt;&lt; 2; <span class="comment">// 0..3 bits -&gt; 2..5 in mNextbits</span>
<a name="l00325"></a>00325       <span class="keywordflow">break</span>;
<a name="l00326"></a>00326     <span class="keywordflow">case</span> 2:
<a name="l00327"></a>00327       assert( (mNextbits &amp; ~0x3C) == 0 );
<a name="l00328"></a>00328       writeBase64( mNextbits | ch &gt;&gt; 6, dcursor, dend ); <span class="comment">// 6..7 bits -&gt; 0..1 in value</span>
<a name="l00329"></a>00329       writeBase64( ch &amp; 0x3F, dcursor, dend ); <span class="comment">// 0..5 bits -&gt; output</span>
<a name="l00330"></a>00330       mNextbits = 0;
<a name="l00331"></a>00331       <span class="keywordflow">break</span>;
<a name="l00332"></a>00332     <span class="keywordflow">default</span>:
<a name="l00333"></a>00333       assert( 0 );
<a name="l00334"></a>00334     }
<a name="l00335"></a>00335     mStepNo = ( mStepNo + 1 ) % 3;
<a name="l00336"></a>00336   }
<a name="l00337"></a>00337 
<a name="l00338"></a>00338   <span class="keywordflow">if</span> ( mOutputBufferCursor ) flushOutputBuffer( dcursor, dend );
<a name="l00339"></a>00339 
<a name="l00340"></a>00340   <span class="keywordflow">return</span> (scursor == send);
<a name="l00341"></a>00341 }
<a name="l00342"></a>00342 
<a name="l00343"></a>00343 
<a name="l00344"></a>00344 <span class="keywordtype">bool</span> <a class="code" href="classKMime_1_1Encoder.html#044de80fc6464e793e8951d282b9c9c0" title="Call this method to finalize the output stream.">Base64Encoder::finish</a>( <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend ) {
<a name="l00345"></a>00345   <span class="keywordflow">return</span> generic_finish( dcursor, dend, <span class="keyword">true</span> );
<a name="l00346"></a>00346 }
<a name="l00347"></a>00347 
<a name="l00348"></a>00348 <span class="keywordtype">bool</span> Rfc2047BEncodingEncoder::finish( <span class="keywordtype">char</span>* &amp; dcursor,
<a name="l00349"></a>00349                       <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend ) {
<a name="l00350"></a>00350   <span class="keywordflow">return</span> generic_finish( dcursor, dend, <span class="keyword">false</span> );
<a name="l00351"></a>00351 }
<a name="l00352"></a>00352 
<a name="l00353"></a>00353 <span class="keywordtype">bool</span> Base64Encoder::generic_finish( <span class="keywordtype">char</span>* &amp; dcursor, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> dend,
<a name="l00354"></a>00354                     <span class="keywordtype">bool</span> withLFatEnd )
<a name="l00355"></a>00355 {
<a name="l00356"></a>00356   <span class="keywordflow">if</span> ( mInsideFinishing )
<a name="l00357"></a>00357     <span class="keywordflow">return</span> flushOutputBuffer( dcursor, dend );
<a name="l00358"></a>00358 
<a name="l00359"></a>00359   <span class="keywordflow">if</span> ( mOutputBufferCursor &amp;&amp; !flushOutputBuffer( dcursor, dend ) )
<a name="l00360"></a>00360     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00361"></a>00361 
<a name="l00362"></a>00362   mInsideFinishing = <span class="keyword">true</span>;
<a name="l00363"></a>00363 
<a name="l00364"></a>00364   <span class="comment">//</span>
<a name="l00365"></a>00365   <span class="comment">// writing out the last mNextbits...</span>
<a name="l00366"></a>00366   <span class="comment">//</span>
<a name="l00367"></a>00367   <span class="keywordflow">switch</span> ( mStepNo ) {
<a name="l00368"></a>00368   <span class="keywordflow">case</span> 1: <span class="comment">// 2 mNextbits waiting to be written. Needs two padding chars:</span>
<a name="l00369"></a>00369   <span class="keywordflow">case</span> 2: <span class="comment">// 4 or 6 mNextbits waiting to be written. Completes a block</span>
<a name="l00370"></a>00370     writeBase64( mNextbits, dcursor, dend );
<a name="l00371"></a>00371     mNextbits = 0;
<a name="l00372"></a>00372     <span class="keywordflow">break</span>;
<a name="l00373"></a>00373   <span class="keywordflow">case</span> 0: <span class="comment">// no padding, nothing to be written, except possibly the CRLF</span>
<a name="l00374"></a>00374     assert( mNextbits == 0 );
<a name="l00375"></a>00375     <span class="keywordflow">break</span>;
<a name="l00376"></a>00376   <span class="keywordflow">default</span>:
<a name="l00377"></a>00377     assert( 0 );
<a name="l00378"></a>00378   }
<a name="l00379"></a>00379 
<a name="l00380"></a>00380   <span class="comment">//</span>
<a name="l00381"></a>00381   <span class="comment">// adding padding...</span>
<a name="l00382"></a>00382   <span class="comment">//</span>
<a name="l00383"></a>00383   <span class="keywordflow">switch</span>( mStepNo ) {
<a name="l00384"></a>00384   <span class="keywordflow">case</span> 1:
<a name="l00385"></a>00385     write( <span class="charliteral">'='</span>, dcursor, dend );
<a name="l00386"></a>00386     <span class="comment">// fall through:</span>
<a name="l00387"></a>00387   <span class="keywordflow">case</span> 2:
<a name="l00388"></a>00388     write( <span class="charliteral">'='</span>, dcursor, dend );
<a name="l00389"></a>00389     <span class="comment">// fall through:</span>
<a name="l00390"></a>00390   <span class="keywordflow">case</span> 0: <span class="comment">// completed an quartet - add CRLF</span>
<a name="l00391"></a>00391     <span class="keywordflow">if</span> ( withLFatEnd )
<a name="l00392"></a>00392       writeCRLF( dcursor, dend );
<a name="l00393"></a>00393     <span class="keywordflow">return</span> flushOutputBuffer( dcursor, dend );
<a name="l00394"></a>00394   <span class="keywordflow">default</span>:
<a name="l00395"></a>00395     assert( 0 );
<a name="l00396"></a>00396   }
<a name="l00397"></a>00397 <span class="keywordflow">return</span> <span class="keyword">true</span>; <span class="comment">// asserts get compiled out</span>
<a name="l00398"></a>00398 }
<a name="l00399"></a>00399 
<a name="l00400"></a>00400 
<a name="l00401"></a>00401 
<a name="l00402"></a>00402 
<a name="l00403"></a>00403 
<a name="l00404"></a>00404 
<a name="l00405"></a>00405 } <span class="comment">// namespace KMime</span>
</pre></div></div>
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