files_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="l00100"></a>00100                 <span class="keywordflow">if</span> (result == char_traits&lt;char&gt;::eof())
<a name="l00101"></a>00101                         <span class="keywordflow">return</span> 0;
<a name="l00102"></a>00102                 <span class="keywordflow">else</span>
<a name="l00103"></a>00103                 {
<a name="l00104"></a>00104                         <span class="keywordtype">size_t</span> blockedBytes = target.<a class="code" href="class_buffered_transformation.html#97a60b54fafdb3df59e1457ef629fc5f">ChannelPut</a>(channel, byte(result), blocking);
<a name="l00105"></a>00105                         begin += 1-blockedBytes;
<a name="l00106"></a>00106                         <span class="keywordflow">return</span> blockedBytes;
<a name="l00107"></a>00107                 }
<a name="l00108"></a>00108         }
<a name="l00109"></a>00109 
<a name="l00110"></a>00110         <span class="comment">// TODO: figure out what happens on cin</span>
<a name="l00111"></a>00111         streampos current = m_stream-&gt;tellg();
<a name="l00112"></a>00112         streampos endPosition = m_stream-&gt;seekg(0, ios::end).tellg();
<a name="l00113"></a>00113         streampos newPosition = current + (streamoff)begin;
<a name="l00114"></a>00114 
<a name="l00115"></a>00115         <span class="keywordflow">if</span> (newPosition &gt;= endPosition)
<a name="l00116"></a>00116         {
<a name="l00117"></a>00117                 m_stream-&gt;seekg(current);
<a name="l00118"></a>00118                 <span class="keywordflow">return</span> 0;       <span class="comment">// don't try to seek beyond the end of file</span>
<a name="l00119"></a>00119         }
<a name="l00120"></a>00120         m_stream-&gt;seekg(newPosition);
<a name="l00121"></a>00121         <span class="keywordflow">try</span>
<a name="l00122"></a>00122         {
<a name="l00123"></a>00123                 assert(!m_waiting);
<a name="l00124"></a>00124                 lword copyMax = end-begin;
<a name="l00125"></a>00125                 <span class="keywordtype">size_t</span> blockedBytes = <span class="keyword">const_cast&lt;</span><a class="code" href="class_file_store.html" title="file-based implementation of Store interface">FileStore</a> *<span class="keyword">&gt;</span>(<span class="keyword">this</span>)-&gt;<a class="code" href="class_file_store.html#792ca84496eb6fc13fb9f5d14244a42c" title="upon return, byteCount contains number of bytes that have finished being transfered...">TransferTo2</a>(target, copyMax, channel, blocking);
<a name="l00126"></a>00126                 begin += copyMax;
<a name="l00127"></a>00127                 <span class="keywordflow">if</span> (blockedBytes)
<a name="l00128"></a>00128                 {
<a name="l00129"></a>00129                         <span class="keyword">const_cast&lt;</span><a class="code" href="class_file_store.html" title="file-based implementation of Store interface">FileStore</a> *<span class="keyword">&gt;</span>(<span class="keyword">this</span>)-&gt;m_waiting = <span class="keyword">false</span>;
<a name="l00130"></a>00130                         <span class="keywordflow">return</span> blockedBytes;
<a name="l00131"></a>00131                 }
<a name="l00132"></a>00132         }
<a name="l00133"></a>00133         <span class="keywordflow">catch</span>(...)
<a name="l00134"></a>00134         {
<a name="l00135"></a>00135                 m_stream-&gt;clear();
<a name="l00136"></a>00136                 m_stream-&gt;seekg(current);
<a name="l00137"></a>00137                 <span class="keywordflow">throw</span>;
<a name="l00138"></a>00138         }
<a name="l00139"></a>00139         m_stream-&gt;clear();
<a name="l00140"></a>00140         m_stream-&gt;seekg(current);
<a name="l00141"></a>00141 
<a name="l00142"></a>00142         <span class="keywordflow">return</span> 0;
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 
<a name="l00145"></a><a class="code" href="class_file_store.html#224d31ea858a3c890fec604a030db7cf">00145</a> lword <a class="code" href="class_file_store.html#224d31ea858a3c890fec604a030db7cf" title="discard skipMax bytes from the output buffer">FileStore::Skip</a>(lword skipMax)
<a name="l00146"></a>00146 {
<a name="l00147"></a>00147         lword oldPos = m_stream-&gt;tellg();
<a name="l00148"></a>00148         std::istream::off_type offset;
<a name="l00149"></a>00149         <span class="keywordflow">if</span> (!SafeConvert(skipMax, offset))
<a name="l00150"></a>00150                 <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html" title="exception thrown when an invalid argument is detected">InvalidArgument</a>(<span class="stringliteral">"FileStore: maximum seek offset exceeded"</span>);
<a name="l00151"></a>00151         m_stream-&gt;seekg(offset, ios::cur);
<a name="l00152"></a>00152         <span class="keywordflow">return</span> (lword)m_stream-&gt;tellg() - oldPos;
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154 
<a name="l00155"></a><a class="code" href="class_file_sink.html#dd89bb9890b60ce429ba590941099790">00155</a> <span class="keywordtype">void</span> <a class="code" href="class_file_sink.html#dd89bb9890b60ce429ba590941099790">FileSink::IsolatedInitialize</a>(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &amp;parameters)
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157         m_file.<a class="code" href="classmember__ptr.html#0191c833924d93e9093b07bab31010fe">reset</a>(<span class="keyword">new</span> std::ofstream);
<a name="l00158"></a>00158         <span class="keyword">const</span> <span class="keywordtype">char</span> *fileName;
<a name="l00159"></a>00159         <span class="keywordflow">if</span> (parameters.<a class="code" href="class_name_value_pairs.html#96686e9f8d6ce3ab870e516fb72b608e" title="get a named value, returns true if the name exists">GetValue</a>(<a class="code" href="namespace_name.html#b5ca7e49b99844e574c3b2eab44e1837" title="const char *">Name::OutputFileName</a>(), fileName))
<a name="l00160"></a>00160         {
<a name="l00161"></a>00161                 ios::openmode binary = parameters.<a class="code" href="class_name_value_pairs.html#943b2009297783f1c35bae46efc3b5f7" title="get a named value, returns the default if the name doesn't exist">GetValueWithDefault</a>(<a class="code" href="namespace_name.html#7683fb8c189189e91a84ddbffd8ad9d4" title="bool">Name::OutputBinaryMode</a>(), <span class="keyword">true</span>) ? ios::binary : ios::openmode(0);
<a name="l00162"></a>00162                 m_file-&gt;open(fileName, ios::out | ios::trunc | binary);
<a name="l00163"></a>00163                 <span class="keywordflow">if</span> (!*m_file)
<a name="l00164"></a>00164                         <span class="keywordflow">throw</span> <a class="code" href="class_file_sink_1_1_open_err.html">OpenErr</a>(fileName);
<a name="l00165"></a>00165                 m_stream = m_file.<a class="code" href="classmember__ptr.html#2d10dec2a51691b589d56b71ec78e59a">get</a>();
<a name="l00166"></a>00166         }
<a name="l00167"></a>00167         <span class="keywordflow">else</span>
<a name="l00168"></a>00168         {
<a name="l00169"></a>00169                 m_stream = NULL;
<a name="l00170"></a>00170                 parameters.<a class="code" href="class_name_value_pairs.html#96686e9f8d6ce3ab870e516fb72b608e" title="get a named value, returns true if the name exists">GetValue</a>(<a class="code" href="namespace_name.html#cb0d5b5aa2d9500f1e912aace88fe0e9" title="std::ostream *">Name::OutputStreamPointer</a>(), m_stream);
<a name="l00171"></a>00171         }
<a name="l00172"></a>00172 }
<a name="l00173"></a>00173 
<a name="l00174"></a><a class="code" href="class_file_sink.html#f6485914da76e0374ad93d79da10030f">00174</a> <span class="keywordtype">bool</span> <a class="code" href="class_file_sink.html#f6485914da76e0374ad93d79da10030f">FileSink::IsolatedFlush</a>(<span class="keywordtype">bool</span> hardFlush, <span class="keywordtype">bool</span> blocking)
<a name="l00175"></a>00175 {
<a name="l00176"></a>00176         <span class="keywordflow">if</span> (!m_stream)
<a name="l00177"></a>00177                 <span class="keywordflow">throw</span> <a class="code" href="class_file_sink_1_1_err.html">Err</a>(<span class="stringliteral">"FileSink: output stream not opened"</span>);
<a name="l00178"></a>00178 
<a name="l00179"></a>00179         m_stream-&gt;flush();
<a name="l00180"></a>00180         <span class="keywordflow">if</span> (!m_stream-&gt;good())
<a name="l00181"></a>00181                 <span class="keywordflow">throw</span> <a class="code" href="class_file_sink_1_1_write_err.html">WriteErr</a>();
<a name="l00182"></a>00182 
<a name="l00183"></a>00183         <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185 
<a name="l00186"></a><a class="code" href="class_file_sink.html#7d9f9457b3a9d7db252e8ba75487020a">00186</a> <span class="keywordtype">size_t</span> <a class="code" href="class_file_sink.html#7d9f9457b3a9d7db252e8ba75487020a" title="input multiple bytes for blocking or non-blocking processing">FileSink::Put2</a>(<span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking)
<a name="l00187"></a>00187 {
<a name="l00188"></a>00188         <span class="keywordflow">if</span> (!m_stream)
<a name="l00189"></a>00189                 <span class="keywordflow">throw</span> <a class="code" href="class_file_sink_1_1_err.html">Err</a>(<span class="stringliteral">"FileSink: output stream not opened"</span>);
<a name="l00190"></a>00190 
<a name="l00191"></a>00191         <span class="keywordflow">while</span> (length &gt; 0)
<a name="l00192"></a>00192         {
<a name="l00193"></a>00193                 std::streamsize size;
<a name="l00194"></a>00194                 <span class="keywordflow">if</span> (!SafeConvert(length, size))
<a name="l00195"></a>00195                         size = numeric_limits&lt;std::streamsize&gt;::max();
<a name="l00196"></a>00196                 m_stream-&gt;write((<span class="keyword">const</span> <span class="keywordtype">char</span> *)inString, size);
<a name="l00197"></a>00197                 inString += size;
<a name="l00198"></a>00198                 length -= size;
<a name="l00199"></a>00199         }
<a name="l00200"></a>00200 
<a name="l00201"></a>00201         <span class="keywordflow">if</span> (messageEnd)
<a name="l00202"></a>00202                 m_stream-&gt;flush();
<a name="l00203"></a>00203 
<a name="l00204"></a>00204         <span class="keywordflow">if</span> (!m_stream-&gt;good())
<a name="l00205"></a>00205                 <span class="keywordflow">throw</span> <a class="code" href="class_file_sink_1_1_write_err.html">WriteErr</a>();
<a name="l00206"></a>00206 
<a name="l00207"></a>00207         <span class="keywordflow">return</span> 0;
<a name="l00208"></a>00208 }
<a name="l00209"></a>00209 
<a name="l00210"></a>00210 NAMESPACE_END
<a name="l00211"></a>00211 
<a name="l00212"></a>00212 <span class="preprocessor">#endif</span>
</pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:21 2007 for Crypto++ by&nbsp;
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address>
</body>
</html>