network_8cpp-source.html

著名的密码库Crypto++的文档 C++语言的杰作。程序员必备。

<a name="l00204"></a>00204 
<a name="l00205"></a>00205                 <span class="keywordtype">double</span> waitTime = <a class="code" href="class_limited_bandwidth.html#ef86232b3bce4c5385f2a1137d63788f">TimeToNextTransceive</a>();
<a name="l00206"></a>00206                 <span class="keywordflow">if</span> (!forever &amp;&amp; waitTime &gt; timeToGo)
<a name="l00207"></a>00207                 {
<a name="l00208"></a>00208                         m_blockedBySpeedLimit = <span class="keyword">true</span>;
<a name="l00209"></a>00209                         <span class="keywordflow">break</span>;
<a name="l00210"></a>00210                 }
<a name="l00211"></a>00211 
<a name="l00212"></a>00212                 <a class="code" href="class_wait_object_container.html" title="container of wait objects">WaitObjectContainer</a> container;
<a name="l00213"></a>00213                 <a class="code" href="class_limited_bandwidth.html#be3aabb618510d9629c1a65382fbfdb3">LimitedBandwidth::GetWaitObjects</a>(container, <a class="code" href="class_call_stack.html">CallStack</a>(<span class="stringliteral">"NonblockingSink::TimedFlush() - speed limit"</span>, 0));
<a name="l00214"></a>00214                 container.<a class="code" href="class_wait_object_container.html#15356e5e6f3329d8056ed7ba53290be6">Wait</a>((<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>)waitTime);
<a name="l00215"></a>00215         }
<a name="l00216"></a>00216 
<a name="l00217"></a>00217         <span class="keywordflow">return</span> totalFlushed;
<a name="l00218"></a>00218 }
<a name="l00219"></a>00219 
<a name="l00220"></a><a class="code" href="class_nonblocking_sink.html#f09858e4c31e657d61ca458d00888e2d">00220</a> <span class="keywordtype">bool</span> <a class="code" href="class_nonblocking_sink.html#f09858e4c31e657d61ca458d00888e2d">NonblockingSink::IsolatedFlush</a>(<span class="keywordtype">bool</span> hardFlush, <span class="keywordtype">bool</span> blocking)
<a name="l00221"></a>00221 {
<a name="l00222"></a>00222         <a class="code" href="class_nonblocking_sink.html#f5da8dc12d42cf6152588ab02de4d336" title="flush to device for no more than maxTime milliseconds">TimedFlush</a>(blocking ? <a class="code" href="cryptlib_8h.html#5dc7a255dd813433eeee3152544c2f1d" title="used to represent infinite time">INFINITE_TIME</a> : 0);
<a name="l00223"></a>00223         <span class="keywordflow">return</span> hardFlush &amp;&amp; (!!GetCurrentBufferSize() || EofPending());
<a name="l00224"></a>00224 }
<a name="l00225"></a>00225 
<a name="l00226"></a>00226 <span class="comment">// *************************************************************</span>
<a name="l00227"></a>00227 
<a name="l00228"></a><a class="code" href="class_network_source.html#6bc7cee112849db2581d9feaca00f0d7">00228</a> <a class="code" href="class_network_source.html#6bc7cee112849db2581d9feaca00f0d7">NetworkSource::NetworkSource</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> *attachment)
<a name="l00229"></a>00229         : <a class="code" href="class_nonblocking_source.html" title="a Source class that can pump from a device for a specified amount of time.">NonblockingSource</a>(attachment), m_buf(1024*16)
<a name="l00230"></a>00230         , m_waitingForResult(false), m_outputBlocked(false)
<a name="l00231"></a>00231         , m_dataBegin(0), m_dataEnd(0)
<a name="l00232"></a>00232 {
<a name="l00233"></a>00233 }
<a name="l00234"></a>00234 
<a name="l00235"></a><a class="code" href="class_network_source.html#b467024c93ec09ec9f301e9a544f3b23">00235</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_network_source.html#b467024c93ec09ec9f301e9a544f3b23">NetworkSource::GetMaxWaitObjectCount</a>()<span class="keyword"> const</span>
<a name="l00236"></a>00236 <span class="keyword"></span>{
<a name="l00237"></a>00237         <span class="keywordflow">return</span> <a class="code" href="class_limited_bandwidth.html#1f5898c4e376b0d205fd784eaf5dec56">LimitedBandwidth::GetMaxWaitObjectCount</a>()
<a name="l00238"></a>00238                 + <a class="code" href="class_network_source.html#f62a2cbe13c7127349aaeb595edb5edd">GetReceiver</a>().<a class="code" href="class_waitable.html#3cac959dd3d871d332b6ca87f3a044b3" title="maximum number of wait objects that this object can return">GetMaxWaitObjectCount</a>()
<a name="l00239"></a>00239                 + <a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">AttachedTransformation</a>()-&gt;<a class="code" href="class_buffered_transformation.html#051a0b5e3e4cc81aca43a9c6cb02e0f9" title="maximum number of wait objects that this object can return">GetMaxWaitObjectCount</a>();
<a name="l00240"></a>00240 }
<a name="l00241"></a>00241 
<a name="l00242"></a><a class="code" href="class_network_source.html#6193d15e11af19041ac1ec17b1228e61">00242</a> <span class="keywordtype">void</span> <a class="code" href="class_network_source.html#6193d15e11af19041ac1ec17b1228e61">NetworkSource::GetWaitObjects</a>(<a class="code" href="class_wait_object_container.html" title="container of wait objects">WaitObjectContainer</a> &amp;container, <a class="code" href="class_call_stack.html">CallStack</a> <span class="keyword">const</span>&amp; callStack)
<a name="l00243"></a>00243 {
<a name="l00244"></a>00244         <span class="keywordflow">if</span> (<a class="code" href="class_nonblocking_source.html#32a9026054da9651a057a471c2256b45">BlockedBySpeedLimit</a>())
<a name="l00245"></a>00245                 <a class="code" href="class_limited_bandwidth.html#be3aabb618510d9629c1a65382fbfdb3">LimitedBandwidth::GetWaitObjects</a>(container, <a class="code" href="class_call_stack.html">CallStack</a>(<span class="stringliteral">"NetworkSource::GetWaitObjects() - speed limit"</span>, &amp;callStack));
<a name="l00246"></a>00246         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!m_outputBlocked)
<a name="l00247"></a>00247         {
<a name="l00248"></a>00248                 <span class="keywordflow">if</span> (m_dataBegin == m_dataEnd)
<a name="l00249"></a>00249                         AccessReceiver().<a class="code" href="class_waitable.html#97155f28db33d3dacc69dc453a01609a" title="put wait objects into container">GetWaitObjects</a>(container, <a class="code" href="class_call_stack.html">CallStack</a>(<span class="stringliteral">"NetworkSource::GetWaitObjects() - no data"</span>, &amp;callStack)); 
<a name="l00250"></a>00250                 <span class="keywordflow">else</span>
<a name="l00251"></a>00251                         container.<a class="code" href="class_wait_object_container.html#ce9c529ebb1956ee2cb9121bdf30402d">SetNoWait</a>(<a class="code" href="class_call_stack.html">CallStack</a>(<span class="stringliteral">"NetworkSource::GetWaitObjects() - have data"</span>, &amp;callStack));
<a name="l00252"></a>00252         }
<a name="l00253"></a>00253 
<a name="l00254"></a>00254         <a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">AttachedTransformation</a>()-&gt;<a class="code" href="class_buffered_transformation.html#127ccd1793fdda6548cd1295f848d0f7" title="put wait objects into container">GetWaitObjects</a>(container, <a class="code" href="class_call_stack.html">CallStack</a>(<span class="stringliteral">"NetworkSource::GetWaitObjects() - attachment"</span>, &amp;callStack));
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256 
<a name="l00257"></a><a class="code" href="class_network_source.html#c3b25ad3c01985e0d1fdec420a47edff">00257</a> <span class="keywordtype">size_t</span> <a class="code" href="class_network_source.html#c3b25ad3c01985e0d1fdec420a47edff">NetworkSource::DoPump</a>(lword &amp;byteCount, <span class="keywordtype">bool</span> blockingOutput, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> maxTime, <span class="keywordtype">bool</span> checkDelimiter, byte delimiter)
<a name="l00258"></a>00258 {
<a name="l00259"></a>00259         <a class="code" href="class_network_receiver.html" title="Network Receiver.">NetworkReceiver</a> &amp;receiver = AccessReceiver();
<a name="l00260"></a>00260 
<a name="l00261"></a>00261         lword maxSize = byteCount;
<a name="l00262"></a>00262         byteCount = 0;
<a name="l00263"></a>00263         <span class="keywordtype">bool</span> forever = maxTime == <a class="code" href="cryptlib_8h.html#5dc7a255dd813433eeee3152544c2f1d" title="used to represent infinite time">INFINITE_TIME</a>;
<a name="l00264"></a>00264         <a class="code" href="class_timer.html" title="high resolution timer">Timer</a> timer(<a class="code" href="class_timer_base.html#ce15d479a8bb76027f1f572010f62fb99a21aebaffc991a16f40f070792f89bf">Timer::MILLISECONDS</a>, forever);
<a name="l00265"></a>00265         <a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> *t = <a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">AttachedTransformation</a>();
<a name="l00266"></a>00266 
<a name="l00267"></a>00267         <span class="keywordflow">if</span> (m_outputBlocked)
<a name="l00268"></a>00268                 <span class="keywordflow">goto</span> DoOutput;
<a name="l00269"></a>00269 
<a name="l00270"></a>00270         <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00271"></a>00271         {
<a name="l00272"></a>00272                 <span class="keywordflow">if</span> (m_dataBegin == m_dataEnd)
<a name="l00273"></a>00273                 {
<a name="l00274"></a>00274                         <span class="keywordflow">if</span> (receiver.<a class="code" href="class_network_receiver.html#eba679e0b607742c7c7298a3796d069d">EofReceived</a>())
<a name="l00275"></a>00275                                 <span class="keywordflow">break</span>;
<a name="l00276"></a>00276 
<a name="l00277"></a>00277                         <span class="keywordflow">if</span> (m_waitingForResult)
<a name="l00278"></a>00278                         {
<a name="l00279"></a>00279                                 <span class="keywordflow">if</span> (receiver.<a class="code" href="class_network_receiver.html#f043f80d3fc9ce4a30edd2eb77a4553a">MustWaitForResult</a>() &amp;&amp;
<a name="l00280"></a>00280                                         !receiver.<a class="code" href="class_waitable.html#ded81bbe562f61932306a64e6122a6ca" title="wait on this object">Wait</a>(SaturatingSubtract(maxTime, timer.<a class="code" href="class_timer_base.html#eab32d0bc5ca83836e0e9f9e108d66a4">ElapsedTime</a>()),
<a name="l00281"></a>00281                                                 <a class="code" href="class_call_stack.html">CallStack</a>(<span class="stringliteral">"NetworkSource::DoPump() - wait receive result"</span>, 0)))
<a name="l00282"></a>00282                                         <span class="keywordflow">break</span>;
<a name="l00283"></a>00283 
<a name="l00284"></a>00284                                 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> recvResult = receiver.<a class="code" href="class_network_receiver.html#3d7974f03642b4da960e918ca1ce485a">GetReceiveResult</a>();
<a name="l00285"></a>00285 <span class="preprocessor">#if CRYPTOPP_TRACE_NETWORK</span>
<a name="l00286"></a>00286 <span class="preprocessor"></span>                                OutputDebugString((IntToString((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)<span class="keyword">this</span>) + <span class="stringliteral">": Received "</span> + IntToString(recvResult) + <span class="stringliteral">" bytes\n"</span>).c_str());
<a name="l00287"></a>00287 <span class="preprocessor">#endif</span>
<a name="l00288"></a>00288 <span class="preprocessor"></span>                                m_dataEnd += recvResult;
<a name="l00289"></a>00289                                 m_waitingForResult = <span class="keyword">false</span>;
<a name="l00290"></a>00290 
<a name="l00291"></a>00291                                 <span class="keywordflow">if</span> (!receiver.<a class="code" href="class_network_receiver.html#27501ca6a36dae0cc344c57f413aea1d">MustWaitToReceive</a>() &amp;&amp; !receiver.<a class="code" href="class_network_receiver.html#eba679e0b607742c7c7298a3796d069d">EofReceived</a>() &amp;&amp; m_dataEnd != m_buf.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>())
<a name="l00292"></a>00292                                         <span class="keywordflow">goto</span> ReceiveNoWait;
<a name="l00293"></a>00293                         }
<a name="l00294"></a>00294                         <span class="keywordflow">else</span>
<a name="l00295"></a>00295                         {
<a name="l00296"></a>00296                                 m_dataEnd = m_dataBegin = 0;
<a name="l00297"></a>00297 
<a name="l00298"></a>00298                                 <span class="keywordflow">if</span> (receiver.<a class="code" href="class_network_receiver.html#27501ca6a36dae0cc344c57f413aea1d">MustWaitToReceive</a>())
<a name="l00299"></a>00299                                 {
<a name="l00300"></a>00300                                         <span class="keywordflow">if</span> (!receiver.<a class="code" href="class_waitable.html#ded81bbe562f61932306a64e6122a6ca" title="wait on this object">Wait</a>(SaturatingSubtract(maxTime, timer.<a class="code" href="class_timer_base.html#eab32d0bc5ca83836e0e9f9e108d66a4">ElapsedTime</a>()),
<a name="l00301"></a>00301                                                         <a class="code" href="class_call_stack.html">CallStack</a>(<span class="stringliteral">"NetworkSource::DoPump() - wait receive"</span>, 0)))
<a name="l00302"></a>00302                                                 <span class="keywordflow">break</span>;
<a name="l00303"></a>00303 
<a name="l00304"></a>00304                                         receiver.<a class="code" href="class_network_receiver.html#5e1c4db8bc07f0bf5b8d06496162cbe1" title="receive data from network source, returns whether result is immediately available...">Receive</a>(m_buf+m_dataEnd, m_buf.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>()-m_dataEnd);
<a name="l00305"></a>00305                                         m_waitingForResult = <span class="keyword">true</span>;
<a name="l00306"></a>00306                                 }
<a name="l00307"></a>00307                                 <span class="keywordflow">else</span>
<a name="l00308"></a>00308                                 {
<a name="l00309"></a>00309 ReceiveNoWait:
<a name="l00310"></a>00310                                         m_waitingForResult = <span class="keyword">true</span>;
<a name="l00311"></a>00311                                         <span class="comment">// call Receive repeatedly as long as data is immediately available,</span>
<a name="l00312"></a>00312                                         <span class="comment">// because some receivers tend to return data in small pieces</span>
<a name="l00313"></a>00313 <span class="preprocessor">#if CRYPTOPP_TRACE_NETWORK</span>
<a name="l00314"></a>00314 <span class="preprocessor"></span>                                        OutputDebugString((IntToString((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)<span class="keyword">this</span>) + <span class="stringliteral">": Receiving "</span> + IntToString(m_buf.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>()-m_dataEnd) + <span class="stringliteral">" bytes\n"</span>).c_str());
<a name="l00315"></a>00315 <span class="preprocessor">#endif</span>