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<h1>kbufferedio.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"> * This file is part of the KDE libraries</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 2001 Thiago Macieira <thiago.macieira@kdemail.net></span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
<a name="l00006"></a>00006 <span class="comment"> * modify it under the terms of the GNU Library General Public</span>
<a name="l00007"></a>00007 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00008"></a>00008 <span class="comment"> * version 2 of the License, or (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * This library is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00013"></a>00013 <span class="comment"> * Library General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"> *</span>
<a name="l00015"></a>00015 <span class="comment"> * You should have received a copy of the GNU Library General Public License</span>
<a name="l00016"></a>00016 <span class="comment"> * along with this library; see the file COPYING.LIB. If not, write to</span>
<a name="l00017"></a>00017 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="l00018"></a>00018 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00019"></a>00019 <span class="comment"> */</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#include "config.h"</span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="preprocessor">#include <string.h></span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="preprocessor">#include <qptrlist.h></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <qcstring.h></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "kbufferedio.h"</span>
<a name="l00028"></a>00028
<a name="l00088"></a>00088 <span class="comment">// constructor</span>
<a name="l00089"></a><a class="code" href="classKBufferedIO.html#b0">00089</a> <a class="code" href="classKBufferedIO.html#b0">KBufferedIO::KBufferedIO</a>() :
<a name="l00090"></a>00090 inBufIndex(0), outBufIndex(0)
<a name="l00091"></a>00091 {
<a name="l00092"></a>00092 <a class="code" href="classKBufferedIO.html#p0">inBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#setAutoDelete">setAutoDelete</a>(<span class="keyword">true</span>);
<a name="l00093"></a>00093 <a class="code" href="classKBufferedIO.html#p1">outBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#setAutoDelete">setAutoDelete</a>(<span class="keyword">true</span>);
<a name="l00094"></a>00094 }
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="comment">// destructor</span>
<a name="l00097"></a><a class="code" href="classKBufferedIO.html#a0">00097</a> <a class="code" href="classKBufferedIO.html#a0">KBufferedIO::~KBufferedIO</a>()
<a name="l00098"></a>00098 {
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="comment">// sets the buffer sizes</span>
<a name="l00102"></a>00102 <span class="comment">// this implementation doesn't support setting the buffer sizes</span>
<a name="l00103"></a>00103 <span class="comment">// if any parameter is different than -1 or -2, fail</span>
<a name="l00104"></a><a class="code" href="classKBufferedIO.html#a2">00104</a> <span class="keywordtype">bool</span> <a class="code" href="classKBufferedIO.html#a2">KBufferedIO::setBufferSize</a>(<span class="keywordtype">int</span> rsize, <span class="keywordtype">int</span> wsize <span class="comment">/* = -2 */</span>)
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106 <span class="keywordflow">if</span> (wsize != -2 && wsize != -1)
<a name="l00107"></a>00107 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00108"></a>00108 <span class="keywordflow">if</span> (rsize != -2 && rsize != -1)
<a name="l00109"></a>00109 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00110"></a>00110
<a name="l00111"></a>00111 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113
<a name="l00114"></a><a class="code" href="classKBufferedIO.html#a3">00114</a> <span class="keywordtype">int</span> <a class="code" href="classKBufferedIO.html#a3">KBufferedIO::bytesAvailable</a>()<span class="keyword"> const</span>
<a name="l00115"></a>00115 <span class="keyword"></span>{
<a name="l00116"></a>00116 <span class="keywordflow">return</span> <a class="code" href="classKBufferedIO.html#b5">readBufferSize</a>();
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00119"></a><a class="code" href="classKBufferedIO.html#a5">00119</a> <span class="keywordtype">int</span> <a class="code" href="classKBufferedIO.html#a5">KBufferedIO::bytesToWrite</a>()<span class="keyword"> const</span>
<a name="l00120"></a>00120 <span class="keyword"></span>{
<a name="l00121"></a>00121 <span class="keywordflow">return</span> <a class="code" href="classKBufferedIO.html#b6">writeBufferSize</a>();
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="comment">// This function will scan the read buffer for a '\n'</span>
<a name="l00125"></a><a class="code" href="classKBufferedIO.html#a6">00125</a> <span class="keywordtype">bool</span> <a class="code" href="classKBufferedIO.html#a6">KBufferedIO::canReadLine</a>()<span class="keyword"> const</span>
<a name="l00126"></a>00126 <span class="keyword"></span>{
<a name="l00127"></a>00127 <span class="keywordflow">if</span> (<a class="code" href="classKBufferedIO.html#a3">bytesAvailable</a>() == 0)
<a name="l00128"></a>00128 <span class="keywordflow">return</span> <span class="keyword">false</span>; <span class="comment">// no new line in here</span>
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a>* buf;
<a name="l00131"></a>00131
<a name="l00132"></a>00132 <span class="comment">// scan each QByteArray for the occurrence of '\n'</span>
<a name="l00133"></a>00133 <a class="codeRef" doxygen="qt.tag:" href="qptrlist.html">QPtrList<QByteArray></a> &buflist = ((<a class="code" href="classKBufferedIO.html">KBufferedIO</a>*)<span class="keyword">this</span>)->inBuf;
<a name="l00134"></a>00134 buf = buflist.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#first">first</a>();
<a name="l00135"></a>00135 <span class="keywordtype">char</span> *p = buf->data() + <a class="code" href="classKBufferedIO.html#p2">inBufIndex</a>;
<a name="l00136"></a>00136 <span class="keywordtype">int</span> n = buf->size() - <a class="code" href="classKBufferedIO.html#p2">inBufIndex</a>;
<a name="l00137"></a>00137 <span class="keywordflow">while</span> (buf != NULL)
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 <span class="keywordflow">while</span> (n--)
<a name="l00140"></a>00140 <span class="keywordflow">if</span> (*p++ == <span class="charliteral">'\n'</span>)
<a name="l00141"></a>00141 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00142"></a>00142 buf = buflist.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#next">next</a>();
<a name="l00143"></a>00143 <span class="keywordflow">if</span> (buf != NULL)
<a name="l00144"></a>00144 {
<a name="l00145"></a>00145 p = buf->data();
<a name="l00146"></a>00146 n = buf->size();
<a name="l00147"></a>00147 }
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149
<a name="l00150"></a>00150 <span class="keywordflow">return</span> <span class="keyword">false</span>; <span class="comment">// no new line found</span>
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152
<a name="l00153"></a>00153 <span class="comment">// unreads the current data</span>
<a name="l00154"></a>00154 <span class="comment">// that is, writes into the read buffer, at the beginning</span>
<a name="l00155"></a><a class="code" href="classKBufferedIO.html#a8">00155</a> <span class="keywordtype">int</span> <a class="code" href="classKBufferedIO.html#a8">KBufferedIO::unreadBlock</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *data, uint len)
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 <span class="keywordflow">return</span> <a class="code" href="classKBufferedIO.html#b3">feedReadBuffer</a>(len, data, <span class="keyword">true</span>);
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="comment">//</span>
<a name="l00161"></a>00161 <span class="comment">// protected member functions</span>
<a name="l00162"></a>00162 <span class="comment">//</span>
<a name="l00163"></a>00163
<a name="l00164"></a><a class="code" href="classKBufferedIO.html#b1">00164</a> <span class="keywordtype">unsigned</span> <a class="code" href="classKBufferedIO.html#b1">KBufferedIO::consumeReadBuffer</a>(<span class="keywordtype">unsigned</span> nbytes, <span class="keywordtype">char</span> *destbuffer, <span class="keywordtype">bool</span> discard)
<a name="l00165"></a>00165 {
<a name="l00166"></a>00166 {
<a name="l00167"></a>00167 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> u = <a class="code" href="classKBufferedIO.html#b5">readBufferSize</a>();
<a name="l00168"></a>00168 <span class="keywordflow">if</span> (nbytes > u)
<a name="l00169"></a>00169 nbytes = u; <span class="comment">// we can't consume more than there is</span>
<a name="l00170"></a>00170 }
<a name="l00171"></a>00171
<a name="l00172"></a>00172 <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a> *buf;
<a name="l00173"></a>00173 <span class="keywordtype">unsigned</span> copied = 0;
<a name="l00174"></a>00174 <span class="keywordtype">unsigned</span> index = <a class="code" href="classKBufferedIO.html#p2">inBufIndex</a>;
<a name="l00175"></a>00175
<a name="l00176"></a>00176 buf = <a class="code" href="classKBufferedIO.html#p0">inBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#first">first</a>();
<a name="l00177"></a>00177 <span class="keywordflow">while</span> (nbytes && buf)
<a name="l00178"></a>00178 {
<a name="l00179"></a>00179 <span class="comment">// should we copy it all?</span>
<a name="l00180"></a>00180 <span class="keywordtype">unsigned</span> to_copy = buf->size() - index;
<a name="l00181"></a>00181 <span class="keywordflow">if</span> (to_copy > nbytes)
<a name="l00182"></a>00182 to_copy = nbytes;
<a name="l00183"></a>00183
<a name="l00184"></a>00184 <span class="keywordflow">if</span> (destbuffer)
<a name="l00185"></a>00185 memcpy(destbuffer + copied, buf->data() + index, to_copy);
<a name="l00186"></a>00186 nbytes -= to_copy;
<a name="l00187"></a>00187 copied += to_copy;
<a name="l00188"></a>00188
<a name="l00189"></a>00189 <span class="keywordflow">if</span> (buf->size() - index > to_copy)
<a name="l00190"></a>00190 {
<a name="l00191"></a>00191 index += to_copy;
<a name="l00192"></a>00192 <span class="keywordflow">break</span>; <span class="comment">// we aren't copying everything, that means that's</span>
<a name="l00193"></a>00193 <span class="comment">// all the user wants</span>
<a name="l00194"></a>00194 }
<a name="l00195"></a>00195 <span class="keywordflow">else</span>
<a name="l00196"></a>00196 {
<a name="l00197"></a>00197 index = 0;
<a name="l00198"></a>00198 <span class="keywordflow">if</span> (discard)
<a name="l00199"></a>00199 {
<a name="l00200"></a>00200 <a class="code" href="classKBufferedIO.html#p0">inBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#remove">remove</a>();
<a name="l00201"></a>00201 buf = <a class="code" href="classKBufferedIO.html#p0">inBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#first">first</a>();
<a name="l00202"></a>00202 }
<a name="l00203"></a>00203 <span class="keywordflow">else</span>
<a name="l00204"></a>00204 buf = <a class="code" href="classKBufferedIO.html#p0">inBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#next">next</a>();
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 }
<a name="l00207"></a>00207
<a name="l00208"></a>00208 <span class="keywordflow">if</span> (discard)
<a name="l00209"></a>00209 <a class="code" href="classKBufferedIO.html#p2">inBufIndex</a> = index;
<a name="l00210"></a>00210
<a name="l00211"></a>00211 <span class="keywordflow">return</span> copied;
<a name="l00212"></a>00212 }
<a name="l00213"></a>00213
<a name="l00214"></a><a class="code" href="classKBufferedIO.html#b2">00214</a> <span class="keywordtype">void</span> <a class="code" href="classKBufferedIO.html#b2">KBufferedIO::consumeWriteBuffer</a>(<span class="keywordtype">unsigned</span> nbytes)
<a name="l00215"></a>00215 {
<a name="l00216"></a>00216 <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a> *buf = <a class="code" href="classKBufferedIO.html#p1">outBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#first">first</a>();
<a name="l00217"></a>00217 <span class="keywordflow">if</span> (buf == NULL)
<a name="l00218"></a>00218 <span class="keywordflow">return</span>; <span class="comment">// nothing to consume</span>
<a name="l00219"></a>00219
<a name="l00220"></a>00220 <span class="keywordflow">if</span> (nbytes < buf-><a class="codeRef" doxygen="qt.tag:" href="qiodevice.html#size">size</a>() - <a class="code" href="classKBufferedIO.html#p3">outBufIndex</a>)
<a name="l00221"></a>00221 <span class="comment">// we want to consume less than there is in the first buffer</span>
<a name="l00222"></a>00222 <a class="code" href="classKBufferedIO.html#p3">outBufIndex</a> += nbytes;
<a name="l00223"></a>00223 <span class="keywordflow">else</span>
<a name="l00224"></a>00224 {
<a name="l00225"></a>00225 nbytes -= buf->size() - <a class="code" href="classKBufferedIO.html#p3">outBufIndex</a>;
<a name="l00226"></a>00226 <a class="code" href="classKBufferedIO.html#p3">outBufIndex</a> = 0;
<a name="l00227"></a>00227 <a class="code" href="classKBufferedIO.html#p1">outBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#remove">remove</a>();
<a name="l00228"></a>00228
<a name="l00229"></a>00229 <span class="keywordflow">while</span> ((buf = <a class="code" href="classKBufferedIO.html#p1">outBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#current">current</a>()) != NULL)
<a name="l00230"></a>00230 <span class="keywordflow">if</span> (buf->size() <= nbytes)
<a name="l00231"></a>00231 {
<a name="l00232"></a>00232 nbytes -= buf->size();
<a name="l00233"></a>00233 <a class="code" href="classKBufferedIO.html#p1">outBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#remove">remove</a>();
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235 <span class="keywordflow">else</span>
<a name="l00236"></a>00236 {
<a name="l00237"></a>00237 <a class="code" href="classKBufferedIO.html#p3">outBufIndex</a> = nbytes;
<a name="l00238"></a>00238 <span class="keywordflow">break</span>;
<a name="l00239"></a>00239 }
<a name="l00240"></a>00240 }
<a name="l00241"></a>00241 }
<a name="l00242"></a>00242
<a name="l00243"></a><a class="code" href="classKBufferedIO.html#b3">00243</a> <span class="keywordtype">unsigned</span> <a class="code" href="classKBufferedIO.html#b3">KBufferedIO::feedReadBuffer</a>(<span class="keywordtype">unsigned</span> nbytes, <span class="keyword">const</span> <span class="keywordtype">char</span> *buffer, <span class="keywordtype">bool</span> atBeginning)
<a name="l00244"></a>00244 {
<a name="l00245"></a>00245 <span class="keywordflow">if</span> (nbytes == 0)
<a name="l00246"></a>00246 <span class="keywordflow">return</span> 0;
<a name="l00247"></a>00247
<a name="l00248"></a>00248 <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a> *a = <span class="keyword">new</span> <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a>(nbytes);
<a name="l00249"></a>00249 a->duplicate(buffer, nbytes);
<a name="l00250"></a>00250
<a name="l00251"></a>00251 <span class="keywordflow">if</span> (atBeginning)
<a name="l00252"></a>00252 <a class="code" href="classKBufferedIO.html#p0">inBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#prepend">prepend</a>(a);
<a name="l00253"></a>00253 <span class="keywordflow">else</span>
<a name="l00254"></a>00254 <a class="code" href="classKBufferedIO.html#p0">inBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#append">append</a>(a);
<a name="l00255"></a>00255
<a name="l00256"></a>00256 <span class="keywordflow">return</span> nbytes;
<a name="l00257"></a>00257 }
<a name="l00258"></a>00258
<a name="l00259"></a><a class="code" href="classKBufferedIO.html#b4">00259</a> <span class="keywordtype">unsigned</span> <a class="code" href="classKBufferedIO.html#b4">KBufferedIO::feedWriteBuffer</a>(<span class="keywordtype">unsigned</span> nbytes, <span class="keyword">const</span> <span class="keywordtype">char</span> *buffer)
<a name="l00260"></a>00260 {
<a name="l00261"></a>00261 <span class="keywordflow">if</span> (nbytes == 0)
<a name="l00262"></a>00262 <span class="keywordflow">return</span> 0;
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a> *a = <span class="keyword">new</span> <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a>(nbytes);
<a name="l00265"></a>00265 a->duplicate(buffer, nbytes);
<a name="l00266"></a>00266 <a class="code" href="classKBufferedIO.html#p1">outBuf</a>.<a class="codeRef" doxygen="qt.tag:" href="qptrlist.html#append">append</a>(a);
<a name="l00267"></a>00267 <span class="keywordflow">return</span> nbytes;
<a name="l00268"></a>00268 }
<a name="l00269"></a>00269
<a name="l00270"></a><a class="code" href="classKBufferedIO.html#b5">00270</a> <span class="keywordtype">unsigned</span> <a class="code" href="classKBufferedIO.html#b5">KBufferedIO::readBufferSize</a>()<span class="keyword"> const</span>
<a name="l00271"></a>00271 <span class="keyword"></span>{
<a name="l00272"></a>00272 <span class="keywordtype">unsigned</span> count = 0;
<a name="l00273"></a>00273 <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a> *buf = ((<a class="code" href="classKBufferedIO.html">KBufferedIO</a>*)<span class="keyword">this</span>)->inBuf.first();
<a name="l00274"></a>00274 <span class="keywordflow">while</span> (buf != NULL)
<a name="l00275"></a>00275 {
<a name="l00276"></a>00276 count += buf->size();
<a name="l00277"></a>00277 buf = ((<a class="code" href="classKBufferedIO.html">KBufferedIO</a>*)<span class="keyword">this</span>)->inBuf.next();
<a name="l00278"></a>00278 }
<a name="l00279"></a>00279
<a name="l00280"></a>00280 <span class="keywordflow">return</span> count - <a class="code" href="classKBufferedIO.html#p2">inBufIndex</a>;
<a name="l00281"></a>00281 }
<a name="l00282"></a>00282
<a name="l00283"></a><a class="code" href="classKBufferedIO.html#b6">00283</a> <span class="keywordtype">unsigned</span> <a class="code" href="classKBufferedIO.html#b6">KBufferedIO::writeBufferSize</a>()<span class="keyword"> const</span>
<a name="l00284"></a>00284 <span class="keyword"></span>{
<a name="l00285"></a>00285 <span class="keywordtype">unsigned</span> count = 0;
<a name="l00286"></a>00286 <a class="codeRef" doxygen="qt.tag:" href="qbytearray.html">QByteArray</a> *buf = ((<a class="code" href="classKBufferedIO.html">KBufferedIO</a>*)<span class="keyword">this</span>)->outBuf.first();
<a name="l00287"></a>00287 <span class="keywordflow">while</span> (buf != NULL)
<a name="l00288"></a>00288 {
<a name="l00289"></a>00289 count += buf->size();
<a name="l00290"></a>00290 buf = (const_cast<KBufferedIO*>(<span class="keyword">this</span>))->outBuf.next();
<a name="l00291"></a>00291 }
<a name="l00292"></a>00292
<a name="l00293"></a>00293 <span class="keywordflow">return</span> count - <a class="code" href="classKBufferedIO.html#p3">outBufIndex</a>;
<a name="l00294"></a>00294 }
<a name="l00295"></a>00295
<a name="l00296"></a><a class="code" href="classKBufferedIO.html#b7">00296</a> <span class="keywordtype">void</span> <a class="code" href="classKBufferedIO.html#b7">KBufferedIO::virtual_hook</a>( <span class="keywordtype">int</span> <span class="keywordtype">id</span>, <span class="keywordtype">void</span>* data )
<a name="l00297"></a>00297 { <a class="code" href="classKAsyncIO.html#b1">KAsyncIO::virtual_hook</a>( <span class="keywordtype">id</span>, data ); }
<a name="l00298"></a>00298
<a name="l00299"></a>00299 <span class="preprocessor">#include "kbufferedio.moc"</span>
</pre></div> </div></div>
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