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<h2><a name="content"></a>libkdepim</h2>
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<h1>qutf7codec.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"> qutf7codec.cpp</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment"> A QTextCodec for UTF-7 (rfc2152).</span>
<a name="l00005"></a>00005 <span class="comment"> Copyright (c) 2001 Marc Mutz <mutz@kde.org></span>
<a name="l00006"></a>00006 <span class="comment"> See file COPYING for details</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> This program is free software; you can redistribute it and/or modify</span>
<a name="l00009"></a>00009 <span class="comment"> it under the terms of the GNU General Public License, version 2.0,</span>
<a name="l00010"></a>00010 <span class="comment"> as published by the Free Software Foundation.</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment"> You should have received a copy of the GNU General Public License</span>
<a name="l00013"></a>00013 <span class="comment"> along with this program; if not, write to the Free Software</span>
<a name="l00014"></a>00014 <span class="comment"> Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA</span>
<a name="l00015"></a>00015 <span class="comment"> 02110-1301, US</span>
<a name="l00016"></a>00016 <span class="comment"></span>
<a name="l00017"></a>00017 <span class="comment"> As a special exception, permission is granted to use this plugin</span>
<a name="l00018"></a>00018 <span class="comment"> with any version of Qt by TrollTech AS, Norway. In this case, the</span>
<a name="l00019"></a>00019 <span class="comment"> use of this plugin doesn't cause the resulting executable to be</span>
<a name="l00020"></a>00020 <span class="comment"> covered by the GNU General Public License.</span>
<a name="l00021"></a>00021 <span class="comment"> This exception does not however invalidate any other reasons why the</span>
<a name="l00022"></a>00022 <span class="comment"> executable file might be covered by the GNU General Public License.</span>
<a name="l00023"></a>00023 <span class="comment">*/</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="preprocessor">#include "qutf7codec.h"</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="preprocessor">#ifndef QT_NO_TEXTCODEC</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>
<a name="l00030"></a>00030 <span class="keywordtype">int</span> QUtf7Codec::mibEnum()<span class="keyword"> const </span>{
<a name="l00031"></a>00031 <span class="keywordflow">return</span> 1012;
<a name="l00032"></a>00032 }
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="keywordtype">int</span> QStrictUtf7Codec::mibEnum()<span class="keyword"> const </span>{
<a name="l00035"></a>00035 <span class="keywordflow">return</span> -1012;
<a name="l00036"></a>00036 }
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">const</span> <span class="keywordtype">char</span>* QUtf7Codec::name()<span class="keyword"> const </span>{
<a name="l00039"></a>00039 <span class="keywordflow">return</span> <span class="stringliteral">"UTF-7"</span>;
<a name="l00040"></a>00040 }
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keyword">const</span> <span class="keywordtype">char</span>* QStrictUtf7Codec::name()<span class="keyword"> const </span>{
<a name="l00043"></a>00043 <span class="keywordflow">return</span> <span class="stringliteral">"X-QT-UTF-7-STRICT"</span>;
<a name="l00044"></a>00044 }
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="keyword">const</span> <span class="keywordtype">char</span>* QUtf7Codec::mimeName()<span class="keyword"> const </span>{
<a name="l00047"></a>00047 <span class="keywordflow">return</span> <span class="stringliteral">"UTF-7"</span>;
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keywordtype">bool</span> QUtf7Codec::canEncode( QChar )<span class="keyword"> const </span>{
<a name="l00051"></a>00051 <span class="keywordflow">return</span> TRUE;
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keywordtype">bool</span> QUtf7Codec::canEncode( <span class="keyword">const</span> QString & )<span class="keyword"> const </span>{
<a name="l00055"></a>00055 <span class="keywordflow">return</span> TRUE;
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="keyword">static</span> uchar base64Set[] = {
<a name="l00059"></a>00059 0x00, 0x00, 0x00, 0x00, <span class="comment">// '\0' ...</span>
<a name="l00060"></a>00060 0x00, 0x11, 0xFF, 0xC0, <span class="comment">// ' ' ... '?'</span>
<a name="l00061"></a>00061 0x7F, 0xFF, 0xFF, 0xE0, <span class="comment">// '@' ... '_'</span>
<a name="l00062"></a>00062 0x7F, 0xFF, 0xFF, 0xE0 <span class="comment">// '`' ... DEL</span>
<a name="l00063"></a>00063 };
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="keyword">static</span> uchar base64SetWithLastTwoBitsZero[] = {
<a name="l00066"></a>00066 0x00, 0x00, 0x00, 0x00, <span class="comment">// '\0' ...</span>
<a name="l00067"></a>00067 0x00, 0x00, 0x88, 0x80, <span class="comment">// ' ' ... '?'</span>
<a name="l00068"></a>00068 0x44, 0x44, 0x44, 0x40, <span class="comment">// '@' ... '_'</span>
<a name="l00069"></a>00069 0x11, 0x11, 0x11, 0x00 <span class="comment">// '`' ... DEL</span>
<a name="l00070"></a>00070 };
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keyword">static</span> uchar directSet[] = {
<a name="l00073"></a>00073 0x00, 0x00, 0x00, 0x00, <span class="comment">// '\0' ...</span>
<a name="l00074"></a>00074 0x01, 0xCF, 0xFF, 0xE1, <span class="comment">// ' ' ... '?'</span>
<a name="l00075"></a>00075 0x7F, 0xFF, 0xFF, 0xE0, <span class="comment">// '@' ... '_'</span>
<a name="l00076"></a>00076 0x7F, 0xFF, 0xFF, 0xE0 <span class="comment">// '`' ... DEL</span>
<a name="l00077"></a>00077 };
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keyword">static</span> uchar optDirectSet[] = {
<a name="l00080"></a>00080 0x00, 0x00, 0x00, 0x00, <span class="comment">// '\0' ...</span>
<a name="l00081"></a>00081 0x7E, 0x20, 0x00, 0x1E, <span class="comment">// ' ' ... '?'</span>
<a name="l00082"></a>00082 0x80, 0x00, 0x00, 0x17, <span class="comment">// '@' ... '_'</span>
<a name="l00083"></a>00083 0x80, 0x00, 0x00, 0x1C <span class="comment">// '`' ... DEL</span>
<a name="l00084"></a>00084 };
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> isOfSet(uchar ch, uchar* <span class="keyword">set</span>) {
<a name="l00087"></a>00087 <span class="keywordflow">return</span> <span class="keyword">set</span>[ ch/8 ] & (0x80 >> ( ch%8 ));
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="keywordtype">int</span> QUtf7Codec::heuristicContentMatch(<span class="keyword">const</span> <span class="keywordtype">char</span>* chars, <span class="keywordtype">int</span> len)<span class="keyword"> const</span>
<a name="l00091"></a>00091 <span class="keyword"></span>{
<a name="l00092"></a>00092 <span class="keywordtype">int</span> stepNo = 0;
<a name="l00093"></a>00093 <span class="keywordtype">int</span> i;
<a name="l00094"></a>00094 <span class="keywordtype">bool</span> shifted = FALSE;
<a name="l00095"></a>00095 <span class="keywordtype">bool</span> rightAfterEscape = FALSE;
<a name="l00096"></a>00096 <span class="keywordtype">bool</span> onlyNullBitsSinceLastBoundary = TRUE;
<a name="l00097"></a>00097 <span class="keywordflow">for</span> ( i = 0; i < len ; i++ ) {
<a name="l00098"></a>00098 <span class="keywordflow">if</span> ((<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>)chars[i] >= 128) <span class="comment">// 8bit chars not allowed.</span>
<a name="l00099"></a>00099 <span class="keywordflow">break</span>;
<a name="l00100"></a>00100 <span class="keywordflow">if</span> (shifted) {
<a name="l00101"></a>00101 <span class="keywordflow">if</span> ( isOfSet(chars[i],base64Set) ) {
<a name="l00102"></a>00102 <span class="keywordflow">switch</span> (stepNo) {
<a name="l00103"></a>00103 <span class="keywordflow">case</span> 0:
<a name="l00104"></a>00104 onlyNullBitsSinceLastBoundary = TRUE;
<a name="l00105"></a>00105 <span class="keywordflow">break</span>;
<a name="l00106"></a>00106 <span class="keywordflow">case</span> 3:
<a name="l00107"></a>00107 onlyNullBitsSinceLastBoundary
<a name="l00108"></a>00108 = isOfSet(chars[i],base64SetWithLastTwoBitsZero);
<a name="l00109"></a>00109 <span class="keywordflow">break</span>;
<a name="l00110"></a>00110 <span class="keywordflow">case</span> 6:
<a name="l00111"></a>00111 onlyNullBitsSinceLastBoundary
<a name="l00112"></a>00112 = ( chars[i] == <span class="charliteral">'A'</span> || chars[i] == <span class="charliteral">'Q'</span> ||
<a name="l00113"></a>00113 chars[i] == <span class="charliteral">'g'</span> || chars[i] == <span class="charliteral">'w'</span> );
<a name="l00114"></a>00114 <span class="keywordflow">break</span>;
<a name="l00115"></a>00115 <span class="keywordflow">default</span>:
<a name="l00116"></a>00116 onlyNullBitsSinceLastBoundary
<a name="l00117"></a>00117 = onlyNullBitsSinceLastBoundary && (chars[i] == <span class="charliteral">'A'</span>);
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119 stepNo = (stepNo + 1) % 8;
<a name="l00120"></a>00120 rightAfterEscape = FALSE;
<a name="l00121"></a>00121 } <span class="keywordflow">else</span> {
<a name="l00122"></a>00122 <span class="keywordflow">if</span> (rightAfterEscape && chars[i] != <span class="charliteral">'-'</span>)
<a name="l00123"></a>00123 <span class="keywordflow">break</span>; <span class="comment">// a '+' must be followed by '-' or a base64 char</span>
<a name="l00124"></a>00124 <span class="keywordflow">if</span> (!onlyNullBitsSinceLastBoundary)
<a name="l00125"></a>00125 <span class="keywordflow">break</span>; <span class="comment">// non-zero bits in the tail of the base64 encoding</span>
<a name="l00126"></a>00126 shifted = FALSE;
<a name="l00127"></a>00127 stepNo = 0;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129 } <span class="keywordflow">else</span> {
<a name="l00130"></a>00130 <span class="keywordflow">if</span> (chars[i] == <span class="charliteral">'+'</span>) {
<a name="l00131"></a>00131 shifted = TRUE;
<a name="l00132"></a>00132 rightAfterEscape = TRUE;
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136 <span class="keywordflow">return</span> i;
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="keyword">class </span>QUtf7Decoder : <span class="keyword">public</span> QTextDecoder {
<a name="l00140"></a>00140 <span class="comment">// the storage for our unicode char until it's finished</span>
<a name="l00141"></a>00141 ushort uc;
<a name="l00142"></a>00142 <span class="comment">// the state of the base64 decoding</span>
<a name="l00143"></a>00143 <span class="comment">// can be 0 (just finished three unicode chars)</span>
<a name="l00144"></a>00144 <span class="comment">// 1 (have the upper 6 bits of uc already)</span>
<a name="l00145"></a>00145 <span class="comment">// 2 (have the upper 12 bits of uc already)</span>
<a name="l00146"></a>00146 <span class="comment">// 3 (have the upper 2 bits of uc already)</span>
<a name="l00147"></a>00147 <span class="comment">// ..........</span>
<a name="l00148"></a>00148 <span class="comment">// 7 (have the upper 10 bits of uc already)</span>
<a name="l00149"></a>00149 <span class="comment">// => n (have the upper (n * 6) % 16 bits of uc already)</span>
<a name="l00150"></a>00150 <span class="comment">// "stepNo" cycles through all it's values every three</span>
<a name="l00151"></a>00151 <span class="comment">// unicode chars.</span>
<a name="l00152"></a>00152 <span class="keywordtype">char</span> stepNo;
<a name="l00153"></a>00153 <span class="comment">// remembers if we are in shifted-sequence mode</span>
<a name="l00154"></a>00154 <span class="keywordtype">bool</span> shifted;
<a name="l00155"></a>00155 <span class="comment">// remembers if we're just after the initial '+'</span>
<a name="l00156"></a>00156 <span class="comment">// of a shifted-sequence.</span>
<a name="l00157"></a>00157 <span class="keywordtype">bool</span> rightAfterEscape;
<a name="l00158"></a>00158 <span class="keyword">public</span>:
<a name="l00159"></a>00159 QUtf7Decoder() : uc(0), stepNo(0), shifted(FALSE), rightAfterEscape(FALSE)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 }
<a name="l00162"></a>00162
<a name="l00163"></a>00163 <span class="keyword">private</span>:
<a name="l00164"></a>00164 <span class="keyword">inline</span> <span class="keywordtype">void</span> resetParser()
<a name="l00165"></a>00165 {
<a name="l00166"></a>00166 uc = 0;
<a name="l00167"></a>00167 stepNo = 0;
<a name="l00168"></a>00168 shifted = FALSE;
<a name="l00169"></a>00169 rightAfterEscape = FALSE;
<a name="l00170"></a>00170 }
<a name="l00171"></a>00171
<a name="l00172"></a>00172 <span class="keyword">public</span>:
<a name="l00173"></a>00173 QString toUnicode(<span class="keyword">const</span> <span class="keywordtype">char</span>* chars, <span class="keywordtype">int</span> len)
<a name="l00174"></a>00174 {
<a name="l00175"></a>00175 QString result = <span class="stringliteral">""</span>;
<a name="l00176"></a>00176 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i<len; i++) {
<a name="l00177"></a>00177 uchar ch = chars[i];
<a name="l00178"></a>00178
<a name="l00179"></a>00179 <span class="comment">//</span>
<a name="l00180"></a>00180 <span class="comment">// check for 8bit char's:</span>
<a name="l00181"></a>00181 <span class="comment">// </span>
<a name="l00182"></a>00182 <span class="keywordflow">if</span> ( ch > 127 ) {
<a name="l00183"></a>00183 qWarning(<span class="stringliteral">"QUtf7Decoder: 8bit char found in input. "</span>
<a name="l00184"></a>00184 <span class="stringliteral">"Parser has been re-initialized!"</span>);
<a name="l00185"></a>00185 resetParser();
<a name="l00186"></a>00186 result += QChar::replacement;
<a name="l00187"></a>00187 <span class="keywordflow">continue</span>;
<a name="l00188"></a>00188 }
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="keywordflow">if</span> (shifted) { <span class="comment">// in shifted mode</span>
<a name="l00191"></a>00191
<a name="l00192"></a>00192 <span class="comment">//</span>
<a name="l00193"></a>00193 <span class="comment">// first, we check specialities that only occur</span>
<a name="l00194"></a>00194 <span class="comment">// right after the escaping '+':</span>
<a name="l00195"></a>00195 <span class="comment">//</span>
<a name="l00196"></a>00196 <span class="keywordflow">if</span> ( rightAfterEscape && ch == <span class="charliteral">'-'</span> ) {
<a name="l00197"></a>00197 <span class="comment">// a "+-" sequence is a short-circuit encoding</span>
<a name="l00198"></a>00198 <span class="comment">// for just '+':</span>
<a name="l00199"></a>00199 resetParser();
<a name="l00200"></a>00200 result += QChar(<span class="charliteral">'+'</span>);
<a name="l00201"></a>00201 <span class="comment">// we're already done for this "ch", so</span>
<a name="l00202"></a>00202 <span class="keywordflow">continue</span>;
<a name="l00203"></a>00203 }
<a name="l00204"></a>00204
<a name="l00205"></a>00205 <span class="comment">//</span>
<a name="l00206"></a>00206 <span class="comment">// Here we're going to extract the bits represented by "ch":</span>
<a name="l00207"></a>00207 <span class="comment">//</span>
<a name="l00208"></a>00208 ushort bits;
<a name="l00209"></a>00209 <span class="keywordflow">if</span> ( ch >= <span class="charliteral">'A'</span> && ch <= <span class="charliteral">'Z'</span> ) {
<a name="l00210"></a>00210 bits = ch - <span class="charliteral">'A'</span>;
<a name="l00211"></a>00211 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch >= <span class="charliteral">'a'</span> && ch <= <span class="charliteral">'z'</span> ) {
<a name="l00212"></a>00212 bits = ch - <span class="charliteral">'a'</span> + 26;
<a name="l00213"></a>00213 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch >= <span class="charliteral">'0'</span> && ch <= <span class="charliteral">'9'</span> ) {
<a name="l00214"></a>00214 bits = ch - <span class="charliteral">'0'</span> + 52;
<a name="l00215"></a>00215 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch == <span class="charliteral">'+'</span> ) {
<a name="l00216"></a>00216 bits = 62;
<a name="l00217"></a>00217 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch == <span class="charliteral">'/'</span> ) {
<a name="l00218"></a>00218 bits = 63;
<a name="l00219"></a>00219 } <span class="keywordflow">else</span> {
<a name="l00220"></a>00220 bits = 0; <span class="comment">// keep compiler happy</span>
<a name="l00221"></a>00221
<a name="l00222"></a>00222 <span class="comment">//</span>
<a name="l00223"></a>00223 <span class="comment">// ch is not of the base64 alphabet.</span>
<a name="l00224"></a>00224 <span class="comment">// Here we are going to check the sequence's validity:</span>
<a name="l00225"></a>00225 <span class="comment">//</span>
<a name="l00226"></a>00226 <span class="keywordflow">if</span> ( rightAfterEscape ) {
<a name="l00227"></a>00227 <span class="comment">// any non-base64 char following an escaping '+'</span>
<a name="l00228"></a>00228 <span class="comment">// makes for an ill-formed sequence.</span>
<a name="l00229"></a>00229 <span class="comment">// Note that we catch (the valid) "+-" pair</span>
<a name="l00230"></a>00230 <span class="comment">// right at the beginning.</span>
<a name="l00231"></a>00231 qWarning(<span class="stringliteral">"QUtf7Decoder: ill-formed input: "</span>
<a name="l00232"></a>00232 <span class="stringliteral">"non-base64 char after escaping \"+\"!"</span>);
<a name="l00233"></a>00233 }
<a name="l00234"></a>00234 <span class="comment">// pending bits from base64 encoding must be all 0:</span>
<a name="l00235"></a>00235 <span class="keywordflow">if</span> (stepNo >= 1 && uc) {
<a name="l00236"></a>00236 qWarning(<span class="stringliteral">"QUtf7Decoder: ill-formed sequence: "</span>
<a name="l00237"></a>00237 <span class="stringliteral">"non-zero bits in shifted-sequence tail!"</span>);
<a name="l00238"></a>00238 }
<a name="l00239"></a>00239 resetParser();
<a name="l00240"></a>00240
<a name="l00241"></a>00241 <span class="comment">// a '-' signifies the end of the shifted-sequence,</span>
<a name="l00242"></a>00242 <span class="comment">// so we just swallow it.</span>
<a name="l00243"></a>00243 <span class="keywordflow">if</span> ( ch == <span class="charliteral">'-'</span> )
<a name="l00244"></a>00244 <span class="keywordflow">continue</span>;
<a name="l00245"></a>00245 <span class="comment">// end of validity checking. Process ch now...</span>
<a name="l00246"></a>00246 }
<a name="l00247"></a>00247
<a name="l00248"></a>00248 <span class="keywordflow">if</span> ( <span class="comment">/*still*/</span> shifted ) {
<a name="l00249"></a>00249 <span class="comment">//</span>
<a name="l00250"></a>00250 <span class="comment">// now we're going to stuff the "bits" bit bucket into</span>
<a name="l00251"></a>00251 <span class="comment">// the right position inside "uc", emitting a resulting</span>
<a name="l00252"></a>00252 <span class="comment">// QChar if possible.</span>
<a name="l00253"></a>00253 <span class="comment">//</span>
<a name="l00254"></a>00254 <span class="keywordflow">switch</span> (stepNo) {
<a name="l00255"></a>00255 <span class="comment">// "bits" are the 6 msb's of uc</span>
<a name="l00256"></a>00256 <span class="keywordflow">case</span> 0: uc = bits << 10; <span class="keywordflow">break</span>;
<a name="l00257"></a>00257
<a name="l00258"></a>00258 <span class="keywordflow">case</span> 1: uc |= bits << 4; <span class="keywordflow">break</span>;
<a name="l00259"></a>00259
<a name="l00260"></a>00260 <span class="comment">// 4 bits of "bits" complete the first ushort</span>
<a name="l00261"></a>00261 <span class="keywordflow">case</span> 2: uc |= bits >> 2; result += QChar(uc);
<a name="l00262"></a>00262 <span class="comment">// 2 bits of "bits" make the msb's of the next ushort</span>
<a name="l00263"></a>00263 uc = bits << 14; <span class="keywordflow">break</span>;
<a name="l00264"></a>00264 <span class="keywordflow">case</span> 3: uc |= bits << 8; <span class="keywordflow">break</span>;
<a name="l00265"></a>00265 <span class="keywordflow">case</span> 4: uc |= bits << 2; <span class="keywordflow">break</span>;
<a name="l00266"></a>00266
<a name="l00267"></a>00267 <span class="comment">// 2 bits of "bits" complete the second ushort</span>
<a name="l00268"></a>00268 <span class="keywordflow">case</span> 5: uc |= bits >> 4; result += QChar(uc);
<a name="l00269"></a>00269 <span class="comment">// 4 bits of "bits" make the msb's of the next ushort</span>
<a name="l00270"></a>00270 uc = bits << 12; <span class="keywordflow">break</span>;
<a name="l00271"></a>00271 <span class="keywordflow">case</span> 6: uc |= bits << 6; <span class="keywordflow">break</span>;
<a name="l00272"></a>00272
<a name="l00273"></a>00273 <span class="comment">// these 6 bits complete the third ushort</span>
<a name="l00274"></a>00274 <span class="comment">// and also one round of 8 chars -> 3 ushort decoding</span>
<a name="l00275"></a>00275 <span class="keywordflow">case</span> 7: uc |= bits; result += QChar(uc);
<a name="l00276"></a>00276 uc = 0; <span class="keywordflow">break</span>;
<a name="l00277"></a>00277 <span class="keywordflow">default</span>: ;
<a name="l00278"></a>00278 } <span class="comment">// switch (stepNo)</span>
<a name="l00279"></a>00279 <span class="comment">// increase the step counter</span>
<a name="l00280"></a>00280 stepNo++;
<a name="l00281"></a>00281 stepNo %= 8;
<a name="l00282"></a>00282 rightAfterEscape = FALSE;
<a name="l00283"></a>00283 <span class="comment">// and look at the next char.</span>
<a name="l00284"></a>00284 <span class="keywordflow">continue</span>;
<a name="l00285"></a>00285 } <span class="comment">// fi (still) shifted</span>
<a name="l00286"></a>00286 } <span class="comment">// fi shifted</span>
<a name="l00287"></a>00287
<a name="l00288"></a>00288 <span class="comment">//</span>
<a name="l00289"></a>00289 <span class="comment">// if control reaches here, we either weren't in a</span>
<a name="l00290"></a>00290 <span class="comment">// shifted sequence or we just left one by seeing</span>
<a name="l00291"></a>00291 <span class="comment">// a non-base64-char.</span>
<a name="l00292"></a>00292 <span class="comment">// Either way, we have to process "ch" outside</span>
<a name="l00293"></a>00293 <span class="comment">// a shifted-sequence now:</span>
<a name="l00294"></a>00294 <span class="comment">//</span>
<a name="l00295"></a>00295 <span class="keywordflow">if</span> ( ch == <span class="charliteral">'+'</span> ) {
<a name="l00296"></a>00296 <span class="comment">// '+' is the escape char for entering a</span>
<a name="l00297"></a>00297 <span class="comment">// shifted sequence:</span>
<a name="l00298"></a>00298 shifted = TRUE;
<a name="l00299"></a>00299 stepNo = 0;
<a name="l00300"></a>00300 <span class="comment">// also, we're right at the beginning where</span>
<a name="l00301"></a>00301 <span class="comment">// special rules apply:</span>
<a name="l00302"></a>00302 rightAfterEscape = TRUE;
<a name="l00303"></a>00303 } <span class="keywordflow">else</span> {
<a name="l00304"></a>00304 <span class="comment">// US-ASCII values are directly used</span>
<a name="l00305"></a>00305 result += QChar(ch);
<a name="l00306"></a>00306 }
<a name="l00307"></a>00307 }
<a name="l00308"></a>00308
<a name="l00309"></a>00309 <span class="keywordflow">return</span> result;
<a name="l00310"></a>00310
<a name="l00311"></a>00311 } <span class="comment">// toUnicode()</span>
<a name="l00312"></a>00312
<a name="l00313"></a>00313 }; <span class="comment">// class QUtf7Decoder</span>
<a name="l00314"></a>00314
<a name="l00315"></a>00315 QTextDecoder* QUtf7Codec::makeDecoder()<span class="keyword"> const</span>
<a name="l00316"></a>00316 <span class="keyword"></span>{
<a name="l00317"></a>00317 <span class="keywordflow">return</span> <span class="keyword">new</span> QUtf7Decoder;
<a name="l00318"></a>00318 }
<a name="l00319"></a>00319
<a name="l00320"></a>00320
<a name="l00321"></a>00321 <span class="keyword">class </span>QUtf7Encoder : <span class="keyword">public</span> QTextEncoder {
<a name="l00322"></a>00322 uchar dontNeedEncodingSet[16];
<a name="l00323"></a>00323 ushort outbits;
<a name="l00324"></a>00324 uint stepNo : 2;
<a name="l00325"></a>00325 <span class="keywordtype">bool</span> shifted : 1;
<a name="l00326"></a>00326 <span class="keywordtype">bool</span> mayContinueShiftedSequence : 1;
<a name="l00327"></a>00327 <span class="keyword">public</span>:
<a name="l00328"></a>00328 QUtf7Encoder(<span class="keywordtype">bool</span> encOpt, <span class="keywordtype">bool</span> encLwsp)
<a name="l00329"></a>00329 : outbits(0), stepNo(0),
<a name="l00330"></a>00330 shifted(FALSE), mayContinueShiftedSequence(FALSE)
<a name="l00331"></a>00331 {
<a name="l00332"></a>00332 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < 16 ; i++) {
<a name="l00333"></a>00333 dontNeedEncodingSet[i] = directSet[i];
<a name="l00334"></a>00334 <span class="keywordflow">if</span> (!encOpt)
<a name="l00335"></a>00335 dontNeedEncodingSet[i] |= optDirectSet[i];
<a name="l00336"></a>00336 }
<a name="l00337"></a>00337 <span class="keywordflow">if</span>(!encLwsp) {
<a name="l00338"></a>00338 dontNeedEncodingSet[<span class="charliteral">' '</span>/8] |= 0x80 >> (<span class="charliteral">' '</span>%8);
<a name="l00339"></a>00339 dontNeedEncodingSet[<span class="charliteral">'\n'</span>/8] |= 0x80 >> (<span class="charliteral">'\n'</span>%8);
<a name="l00340"></a>00340 dontNeedEncodingSet[<span class="charliteral">'\r'</span>/8] |= 0x80 >> (<span class="charliteral">'\r'</span>%8);
<a name="l00341"></a>00341 dontNeedEncodingSet[<span class="charliteral">'\t'</span>/8] |= 0x80 >> (<span class="charliteral">'\t'</span>%8);
<a name="l00342"></a>00342 }
<a name="l00343"></a>00343 }
<a name="l00344"></a>00344
<a name="l00345"></a>00345 <span class="keyword">private</span>:
<a name="l00346"></a>00346
<a name="l00347"></a>00347 <span class="keywordtype">char</span> toBase64( ushort u ) {
<a name="l00348"></a>00348 <span class="keywordflow">if</span> ( u < 26 )
<a name="l00349"></a>00349 <span class="keywordflow">return</span> (<span class="keywordtype">char</span>)u + <span class="charliteral">'A'</span>;
<a name="l00350"></a>00350 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( u < 52 )
<a name="l00351"></a>00351 <span class="keywordflow">return</span> (<span class="keywordtype">char</span>)u - 26 + <span class="charliteral">'a'</span>;
<a name="l00352"></a>00352 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( u < 62 )
<a name="l00353"></a>00353 <span class="keywordflow">return</span> (<span class="keywordtype">char</span>)u - 52 + <span class="charliteral">'0'</span>;
<a name="l00354"></a>00354 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( u == 62 )
<a name="l00355"></a>00355 <span class="keywordflow">return</span> <span class="charliteral">'+'</span>;
<a name="l00356"></a>00356 <span class="keywordflow">else</span>
<a name="l00357"></a>00357 <span class="keywordflow">return</span> <span class="charliteral">'/'</span>;
<a name="l00358"></a>00358 }
<a name="l00359"></a>00359
<a name="l00360"></a>00360 <span class="keywordtype">void</span> addToShiftedSequence(QCString::Iterator & t, ushort u) {
<a name="l00361"></a>00361 <span class="keywordflow">switch</span> (stepNo) {
<a name="l00362"></a>00362 <span class="comment">// no outbits; use uppermost 6 bits of u</span>
<a name="l00363"></a>00363 <span class="keywordflow">case</span> 0:
<a name="l00364"></a>00364 *t++ = toBase64( u >> 10 );
<a name="l00365"></a>00365 *t++ = toBase64( (u & 0x03FF <span class="comment">/* umask top 6 bits */</span> ) >> 4 );
<a name="l00366"></a>00366 <span class="comment">// save 4 lowest-order bits in outbits[5..2]</span>
<a name="l00367"></a>00367 outbits = (u & 0x000F) << 2;
<a name="l00368"></a>00368 <span class="keywordflow">break</span>;
<a name="l00369"></a>00369
<a name="l00370"></a>00370 <span class="comment">// outbits available; use top two bits of u to complete</span>
<a name="l00371"></a>00371 <span class="comment">// the previous char</span>
<a name="l00372"></a>00372 <span class="keywordflow">case</span> 1:
<a name="l00373"></a>00373 <span class="keywordflow">if</span> (!mayContinueShiftedSequence) {
<a name="l00374"></a>00374 <span class="comment">// if mayContinue, this char has already been written</span>
<a name="l00375"></a>00375 *t++ = toBase64( outbits | ( u >> 14 ) );
<a name="l00376"></a>00376 }
<a name="l00377"></a>00377 *t++ = toBase64( (u & 0x3F00 <span class="comment">/* mask top 2 bits */</span> ) >> 8 );
<a name="l00378"></a>00378 *t++ = toBase64( (u & 0x00FC <span class="comment">/* mask msbyte */</span> ) >> 2 );
<a name="l00379"></a>00379 <span class="comment">// save 2 lowest-significant bits in outbits[5..4]</span>
<a name="l00380"></a>00380 outbits = (u & 0x0003) << 4;
<a name="l00381"></a>00381 <span class="keywordflow">break</span>;
<a name="l00382"></a>00382
<a name="l00383"></a>00383 <span class="comment">// outbits available; use top four bits of u to complete</span>
<a name="l00384"></a>00384 <span class="comment">// the previous char</span>
<a name="l00385"></a>00385 <span class="keywordflow">case</span> 2:
<a name="l00386"></a>00386 <span class="keywordflow">if</span> (!mayContinueShiftedSequence) {
<a name="l00387"></a>00387 <span class="comment">// if mayContinue, this char has already been written</span>
<a name="l00388"></a>00388 *t++ = toBase64( outbits | ( u >> 12 ) );
<a name="l00389"></a>00389 }
<a name="l00390"></a>00390 *t++ = toBase64( (u & 0x0FFF) >> 6 );
<a name="l00391"></a>00391 *t++ = toBase64( u & 0x003F );
<a name="l00392"></a>00392 <span class="keywordflow">break</span>;
<a name="l00393"></a>00393
<a name="l00394"></a>00394 <span class="keywordflow">default</span>: ;
<a name="l00395"></a>00395 }
<a name="l00396"></a>00396 stepNo = (stepNo + 1) % 3;
<a name="l00397"></a>00397 }
<a name="l00398"></a>00398
<a name="l00399"></a>00399 <span class="keywordtype">void</span> endShiftedSequence(QCString::Iterator & t) {
<a name="l00400"></a>00400 <span class="keywordflow">switch</span> (stepNo) {
<a name="l00401"></a>00401 <span class="keywordflow">case</span> 1: <span class="comment">// four outbits still to be written</span>
<a name="l00402"></a>00402 <span class="keywordflow">case</span> 2: <span class="comment">// two outbits still to be written</span>
<a name="l00403"></a>00403 *t++ = toBase64( outbits );
<a name="l00404"></a>00404 <span class="keywordflow">break</span>;
<a name="l00405"></a>00405 <span class="keywordflow">case</span> 0: <span class="comment">// nothing to do</span>
<a name="l00406"></a>00406 <span class="keywordflow">default</span>: ;
<a name="l00407"></a>00407 }
<a name="l00408"></a>00408 outbits = 0;
<a name="l00409"></a>00409 }
<a name="l00410"></a>00410
<a name="l00411"></a>00411 <span class="comment">// depending on the stepNo, checks whether we can continue</span>
<a name="l00412"></a>00412 <span class="comment">// an already ended shifted-sequence with char "u".</span>
<a name="l00413"></a>00413 <span class="comment">// This is only possible if the topmost bits fit the</span>
<a name="l00414"></a>00414 <span class="comment">// already written ones (which are all 0 between calls)</span>
<a name="l00415"></a>00415 <span class="keywordtype">bool</span> continueOK( ushort u ) {
<a name="l00416"></a>00416 <span class="keywordflow">return</span> stepNo == 0 ||
<a name="l00417"></a>00417 ( stepNo == 1 && (u & 0xF000) == 0 ) ||
<a name="l00418"></a>00418 ( stepNo == 2 && (u & 0xC000) == 0 );
<a name="l00419"></a>00419 }
<a name="l00420"></a>00420
<a name="l00421"></a>00421 <span class="keywordtype">void</span> processDoesntNeedEncoding(QCString::Iterator & t, ushort ch) {
<a name="l00422"></a>00422 <span class="comment">// doesn't need encoding</span>
<a name="l00423"></a>00423 <span class="keywordflow">if</span> (shifted) {
<a name="l00424"></a>00424 endShiftedSequence(t);
<a name="l00425"></a>00425 <span class="comment">// add "lead-out" to dis-ambiguate following chars:</span>
<a name="l00426"></a>00426 <span class="keywordflow">if</span> (isOfSet((<span class="keywordtype">char</span>)ch,base64Set) || ch == <span class="charliteral">'-'</span> ) {
<a name="l00427"></a>00427 *t++ = <span class="charliteral">'-'</span>;
<a name="l00428"></a>00428 }
<a name="l00429"></a>00429 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (mayContinueShiftedSequence) {
<a name="l00430"></a>00430 <span class="comment">// if mayContinue is set, this means the</span>
<a name="l00431"></a>00431 <span class="comment">// shifted-sequence needs a lead-out.</span>
<a name="l00432"></a>00432 mayContinueShiftedSequence = FALSE;
<a name="l00433"></a>00433 <span class="keywordflow">if</span> (isOfSet(ch,base64Set) || ch == <span class="charliteral">'-'</span> ) {
<a name="l00434"></a>00434 *t++ = <span class="charliteral">'-'</span>;
<a name="l00435"></a>00435 }
<a name="l00436"></a>00436 }
<a name="l00437"></a>00437 *t++ = (uchar)ch;
<a name="l00438"></a>00438 shifted = FALSE;
<a name="l00439"></a>00439 stepNo = 0;
<a name="l00440"></a>00440 }
<a name="l00441"></a>00441
<a name="l00442"></a>00442 <span class="keyword">public</span>:
<a name="l00443"></a>00443 QCString fromUnicode(<span class="keyword">const</span> QString & uc, <span class="keywordtype">int</span> & len_in_out)
<a name="l00444"></a>00444 {
<a name="l00445"></a>00445 <span class="comment">// allocate place for worst case:</span>
<a name="l00446"></a>00446 <span class="comment">// len/2 * (5+1) for an alternating sequence of e.g. "A\",</span>
<a name="l00447"></a>00447 <span class="comment">// + 4 for a worst-case of another +ABC encoded char</span>
<a name="l00448"></a>00448 <span class="comment">// + 1 for the trailing \0</span>
<a name="l00449"></a>00449 <span class="comment">// </span>
<a name="l00450"></a>00450 <span class="keywordtype">int</span> maxreslen = 3 * len_in_out + 5;
<a name="l00451"></a>00451 QCString result( maxreslen );
<a name="l00452"></a>00452
<a name="l00453"></a>00453 <span class="preprocessor">#if 0</span>
<a name="l00454"></a>00454 <span class="preprocessor"></span> <span class="comment">// if (len_in_out == 1) {</span>
<a name="l00455"></a>00455 cout << <span class="stringliteral">"\nlen_in_out: "</span> << len_in_out
<a name="l00456"></a>00456 <<<span class="stringliteral">"; shifted: "</span> << (shifted ? <span class="stringliteral">"true"</span> : <span class="stringliteral">"false"</span>)
<a name="l00457"></a>00457 << <span class="stringliteral">";\n"</span> << <span class="stringliteral">"mayContinue: "</span>
<a name="l00458"></a>00458 << (mayContinueShiftedSequence ? <span class="stringliteral">"true"</span> : <span class="stringliteral">"false"</span>)
<a name="l00459"></a>00459 << <span class="stringliteral">"; stepNo: "</span> << stepNo << <span class="stringliteral">";\n"</span>
<a name="l00460"></a>00460 << <span class="stringliteral">"outbits: "</span> << outbits << endl;
<a name="l00461"></a>00461 <span class="comment">// }</span>
<a name="l00462"></a>00462 <span class="preprocessor">#endif</span>
<a name="l00463"></a>00463 <span class="preprocessor"></span>
<a name="l00464"></a>00464 <span class="comment">// source and destination cursor</span>
<a name="l00465"></a>00465 <span class="keyword">const</span> QChar * s = uc.unicode();
<a name="l00466"></a>00466 QCString::Iterator t = result.data();
<a name="l00467"></a>00467
<a name="l00468"></a>00468 <span class="keywordflow">if</span> ( uc.isNull() ) {
<a name="l00469"></a>00469 <span class="comment">// return to ascii requested:</span>
<a name="l00470"></a>00470 <span class="keywordflow">if</span> ( mayContinueShiftedSequence )
<a name="l00471"></a>00471 *t++ = <span class="charliteral">'-'</span>;
<a name="l00472"></a>00472 } <span class="keywordflow">else</span> {
<a name="l00473"></a>00473 <span class="comment">// normal operation:</span>
<a name="l00474"></a>00474 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0 ; i < len_in_out ;
<a name="l00475"></a>00475 i++<span class="comment">/*, checkOutBuf(result,maxreslen,t,i,len_in_out,5)*/</span> ) {
<a name="l00476"></a>00476 ushort ch = s[i].unicode();
<a name="l00477"></a>00477
<a name="l00478"></a>00478 <span class="comment">//</span>
<a name="l00479"></a>00479 <span class="comment">// first, we check whether we might get around encoding:</span>
<a name="l00480"></a>00480 <span class="comment">//</span>
<a name="l00481"></a>00481 <span class="keywordflow">if</span> ( ch < 128 ) {
<a name="l00482"></a>00482 <span class="comment">//</span>
<a name="l00483"></a>00483 <span class="comment">// ch is usAscii, so we have a chance that we don't</span>
<a name="l00484"></a>00484 <span class="comment">// need to encode it.</span>
<a name="l00485"></a>00485 <span class="comment">//</span>
<a name="l00486"></a>00486 <span class="keywordflow">if</span> ( isOfSet((uchar)ch,dontNeedEncodingSet) ) {
<a name="l00487"></a>00487 processDoesntNeedEncoding(t,ch);
<a name="l00488"></a>00488 <span class="keywordflow">continue</span>;
<a name="l00489"></a>00489 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( ch == <span class="charliteral">'+'</span> ) {
<a name="l00490"></a>00490 <span class="comment">// '+' is the shift escape character</span>
<a name="l00491"></a>00491 <span class="keywordflow">if</span> (shifted || mayContinueShiftedSequence) {
<a name="l00492"></a>00492 <span class="comment">// if we are already in shifted mode, we just</span>
<a name="l00493"></a>00493 <span class="comment">// encode the '+', too. Compare</span>
<a name="l00494"></a>00494 <span class="comment">// 24bits ("-+-") + some from ending the shifted-sequence</span>
<a name="l00495"></a>00495 <span class="comment">// with 21,33 bits</span>
<a name="l00496"></a>00496 addToShiftedSequence(t,ch);
<a name="l00497"></a>00497 mayContinueShiftedSequence = FALSE;
<a name="l00498"></a>00498 shifted = TRUE;
<a name="l00499"></a>00499 } <span class="keywordflow">else</span> {
<a name="l00500"></a>00500 <span class="comment">// shortcut encoding of '+':</span>
<a name="l00501"></a>00501 *t++ = <span class="charliteral">'+'</span>;
<a name="l00502"></a>00502 *t++ = <span class="charliteral">'-'</span>;
<a name="l00503"></a>00503 }
<a name="l00504"></a>00504 <span class="keywordflow">continue</span>; <span class="comment">// done</span>
<a name="l00505"></a>00505 } <span class="comment">// else fall through to encoding</span>
<a name="l00506"></a>00506 }
<a name="l00507"></a>00507 <span class="comment">//</span>
<a name="l00508"></a>00508 <span class="comment">// need encoding</span>
<a name="l00509"></a>00509 <span class="comment">//</span>
<a name="l00510"></a>00510 <span class="keywordflow">if</span> (!shifted && (!mayContinueShiftedSequence || !continueOK(ch) ) ) {
<a name="l00511"></a>00511 *t++ = <span class="charliteral">'+'</span>;
<a name="l00512"></a>00512 stepNo = 0;
<a name="l00513"></a>00513 }
<a name="l00514"></a>00514 addToShiftedSequence(t,ch);
<a name="l00515"></a>00515 shifted = TRUE;
<a name="l00516"></a>00516 mayContinueShiftedSequence = FALSE;
<a name="l00517"></a>00517 }
<a name="l00518"></a>00518
<a name="l00519"></a>00519 <span class="keywordflow">if</span> ( shifted ) {
<a name="l00520"></a>00520 endShiftedSequence(t);
<a name="l00521"></a>00521 mayContinueShiftedSequence = TRUE;
<a name="l00522"></a>00522 };
<a name="l00523"></a>00523 shifted = FALSE;
<a name="l00524"></a>00524 }
<a name="l00525"></a>00525
<a name="l00526"></a>00526 *t = <span class="charliteral">'\0'</span>;
<a name="l00527"></a>00527 len_in_out = t - result.data();
<a name="l00528"></a>00528
<a name="l00529"></a>00529 <span class="preprocessor">#if 0</span>
<a name="l00530"></a>00530 <span class="preprocessor"></span> cout << <span class="stringliteral">"len_in_out: "</span> << len_in_out << <span class="stringliteral">"; "</span>
<a name="l00531"></a>00531 << <span class="stringliteral">"mayContinue: "</span> << (mayContinueShiftedSequence ? <span class="stringliteral">"true"</span> : <span class="stringliteral">"false"</span>)
<a name="l00532"></a>00532 << <span class="stringliteral">"; stepNo: "</span> << stepNo << endl;
<a name="l00533"></a>00533 <span class="preprocessor">#endif</span>
<a name="l00534"></a>00534 <span class="preprocessor"></span>
<a name="l00535"></a>00535 Q_ASSERT(len_in_out <= maxreslen-1);
<a name="l00536"></a>00536
<a name="l00537"></a>00537 <span class="keywordflow">return</span> result;
<a name="l00538"></a>00538 } <span class="comment">// fromUnicode()</span>
<a name="l00539"></a>00539
<a name="l00540"></a>00540 }; <span class="comment">// class QUtf7Encoder</span>
<a name="l00541"></a>00541
<a name="l00542"></a>00542 QTextEncoder* QUtf7Codec::makeEncoder()<span class="keyword"> const </span>{
<a name="l00543"></a>00543 <span class="keywordflow">return</span> <span class="keyword">new</span> QUtf7Encoder( <span class="keyword">false</span>, <span class="keyword">false</span> );
<a name="l00544"></a>00544 }
<a name="l00545"></a>00545
<a name="l00546"></a>00546 QTextEncoder* QStrictUtf7Codec::makeEncoder()<span class="keyword"> const </span>{
<a name="l00547"></a>00547 <span class="keywordflow">return</span> <span class="keyword">new</span> QUtf7Encoder( <span class="keyword">true</span>, <span class="keyword">false</span> );
<a name="l00548"></a>00548 }
<a name="l00549"></a>00549
<a name="l00550"></a>00550 <span class="preprocessor">#endif // QT_NO_TEXTCODEC</span>
</pre></div></div>
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