zinflate_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="l00222"></a>00222 {
<a name="l00223"></a>00223         m_state = PRE_STREAM;
<a name="l00224"></a>00224         parameters.<a class="code" href="class_name_value_pairs.html#96686e9f8d6ce3ab870e516fb72b608e" title="get a named value, returns true if the name exists">GetValue</a>(<span class="stringliteral">"Repeat"</span>, m_repeat);
<a name="l00225"></a>00225         <a class="code" href="class_inflator.html#e219ede9a3c7342d6c9262f87c8a571d">m_inQueue</a>.<a class="code" href="class_byte_queue.html#2c305604a71571438aeb4c4e5e567c45">Clear</a>();
<a name="l00226"></a>00226         m_reader.<a class="code" href="class_low_first_bit_reader.html#7127a720aeefbc1d91dddefc694538c6">SkipBits</a>(m_reader.<a class="code" href="class_low_first_bit_reader.html#62533059d5572cf7dfc5bcb7d308bec6">BitsBuffered</a>());
<a name="l00227"></a>00227 }
<a name="l00228"></a>00228 
<a name="l00229"></a>00229 <span class="keywordtype">void</span> Inflator::OutputByte(byte b)
<a name="l00230"></a>00230 {
<a name="l00231"></a>00231         m_window[m_current++] = b;
<a name="l00232"></a>00232         <span class="keywordflow">if</span> (m_current == m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>())
<a name="l00233"></a>00233         {
<a name="l00234"></a>00234                 ProcessDecompressedData(m_window + m_lastFlush, m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>() - m_lastFlush);
<a name="l00235"></a>00235                 m_lastFlush = 0;
<a name="l00236"></a>00236                 m_current = 0;
<a name="l00237"></a>00237                 m_wrappedAround = <span class="keyword">true</span>;
<a name="l00238"></a>00238         }
<a name="l00239"></a>00239 }
<a name="l00240"></a>00240 
<a name="l00241"></a>00241 <span class="keywordtype">void</span> Inflator::OutputString(<span class="keyword">const</span> byte *<span class="keywordtype">string</span>, <span class="keywordtype">size_t</span> length)
<a name="l00242"></a>00242 {
<a name="l00243"></a>00243         <span class="keywordflow">while</span> (length)
<a name="l00244"></a>00244         {
<a name="l00245"></a>00245                 <span class="keywordtype">size_t</span> len = UnsignedMin(length, m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>() - m_current);
<a name="l00246"></a>00246                 memcpy(m_window + m_current, <span class="keywordtype">string</span>, len);
<a name="l00247"></a>00247                 m_current += len;
<a name="l00248"></a>00248                 <span class="keywordflow">if</span> (m_current == m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>())
<a name="l00249"></a>00249                 {
<a name="l00250"></a>00250                         ProcessDecompressedData(m_window + m_lastFlush, m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>() - m_lastFlush);
<a name="l00251"></a>00251                         m_lastFlush = 0;
<a name="l00252"></a>00252                         m_current = 0;
<a name="l00253"></a>00253                         m_wrappedAround = <span class="keyword">true</span>;
<a name="l00254"></a>00254                 }
<a name="l00255"></a>00255                 <span class="keywordtype">string</span> += len;
<a name="l00256"></a>00256                 length -= len;
<a name="l00257"></a>00257         }               
<a name="l00258"></a>00258 }
<a name="l00259"></a>00259 
<a name="l00260"></a>00260 <span class="keywordtype">void</span> Inflator::OutputPast(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> distance)
<a name="l00261"></a>00261 {
<a name="l00262"></a>00262         <span class="keywordtype">size_t</span> start;
<a name="l00263"></a>00263         <span class="keywordflow">if</span> (distance &lt;= m_current)
<a name="l00264"></a>00264                 start = m_current - distance;
<a name="l00265"></a>00265         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_wrappedAround &amp;&amp; distance &lt;= m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>())
<a name="l00266"></a>00266                 start = m_current + m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>() - distance;
<a name="l00267"></a>00267         <span class="keywordflow">else</span>
<a name="l00268"></a>00268                 <span class="keywordflow">throw</span> BadBlockErr();
<a name="l00269"></a>00269 
<a name="l00270"></a>00270         <span class="keywordflow">if</span> (start + length &gt; m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>())
<a name="l00271"></a>00271         {
<a name="l00272"></a>00272                 <span class="keywordflow">for</span> (; start &lt; m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>(); start++, length--)
<a name="l00273"></a>00273                         OutputByte(m_window[start]);
<a name="l00274"></a>00274                 start = 0;
<a name="l00275"></a>00275         }
<a name="l00276"></a>00276 
<a name="l00277"></a>00277         <span class="keywordflow">if</span> (start + length &gt; m_current || m_current + length &gt;= m_window.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>())
<a name="l00278"></a>00278         {
<a name="l00279"></a>00279                 <span class="keywordflow">while</span> (length--)
<a name="l00280"></a>00280                         OutputByte(m_window[start++]);
<a name="l00281"></a>00281         }
<a name="l00282"></a>00282         <span class="keywordflow">else</span>
<a name="l00283"></a>00283         {
<a name="l00284"></a>00284                 memcpy(m_window + m_current, m_window + start, length);
<a name="l00285"></a>00285                 m_current += length;
<a name="l00286"></a>00286         }
<a name="l00287"></a>00287 }
<a name="l00288"></a>00288 
<a name="l00289"></a><a class="code" href="class_inflator.html#eb7d602a16d9263b25b96030aa5583ec">00289</a> <span class="keywordtype">size_t</span> <a class="code" href="class_inflator.html#eb7d602a16d9263b25b96030aa5583ec" title="input multiple bytes for blocking or non-blocking processing">Inflator::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="l00290"></a>00290 {
<a name="l00291"></a>00291         <span class="keywordflow">if</span> (!blocking)
<a name="l00292"></a>00292                 <span class="keywordflow">throw</span> BlockingInputOnly(<span class="stringliteral">"Inflator"</span>);
<a name="l00293"></a>00293 
<a name="l00294"></a>00294         <a class="code" href="class_lazy_putter.html" title="use this to make sure LazyPut is finalized in event of exception">LazyPutter</a> lp(<a class="code" href="class_inflator.html#e219ede9a3c7342d6c9262f87c8a571d">m_inQueue</a>, inString, length);
<a name="l00295"></a>00295         ProcessInput(messageEnd != 0);
<a name="l00296"></a>00296 
<a name="l00297"></a>00297         <span class="keywordflow">if</span> (messageEnd)
<a name="l00298"></a>00298                 <span class="keywordflow">if</span> (!(m_state == PRE_STREAM || m_state == AFTER_END))
<a name="l00299"></a>00299                         <span class="keywordflow">throw</span> <a class="code" href="class_inflator_1_1_unexpected_end_err.html">UnexpectedEndErr</a>();
<a name="l00300"></a>00300 
<a name="l00301"></a>00301         <a class="code" href="class_filter.html#a05cdcaa161f2131cf4d5dcb8903e11f">Output</a>(0, NULL, 0, messageEnd, blocking);
<a name="l00302"></a>00302         <span class="keywordflow">return</span> 0;
<a name="l00303"></a>00303 }
<a name="l00304"></a>00304 
<a name="l00305"></a><a class="code" href="class_inflator.html#ffacf5ce529cc11dc72e5b46ef42d9f7">00305</a> <span class="keywordtype">bool</span> <a class="code" href="class_inflator.html#ffacf5ce529cc11dc72e5b46ef42d9f7">Inflator::IsolatedFlush</a>(<span class="keywordtype">bool</span> hardFlush, <span class="keywordtype">bool</span> blocking)
<a name="l00306"></a>00306 {
<a name="l00307"></a>00307         <span class="keywordflow">if</span> (!blocking)
<a name="l00308"></a>00308                 <span class="keywordflow">throw</span> BlockingInputOnly(<span class="stringliteral">"Inflator"</span>);
<a name="l00309"></a>00309 
<a name="l00310"></a>00310         <span class="keywordflow">if</span> (hardFlush)
<a name="l00311"></a>00311                 ProcessInput(<span class="keyword">true</span>);
<a name="l00312"></a>00312         FlushOutput();
<a name="l00313"></a>00313 
<a name="l00314"></a>00314         <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00315"></a>00315 }
<a name="l00316"></a>00316 
<a name="l00317"></a>00317 <span class="keywordtype">void</span> Inflator::ProcessInput(<span class="keywordtype">bool</span> flush)
<a name="l00318"></a>00318 {
<a name="l00319"></a>00319         <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00320"></a>00320         {
<a name="l00321"></a>00321                 <span class="keywordflow">switch</span> (m_state)
<a name="l00322"></a>00322                 {
<a name="l00323"></a>00323                 <span class="keywordflow">case</span> PRE_STREAM:
<a name="l00324"></a>00324                         <span class="keywordflow">if</span> (!flush &amp;&amp; <a class="code" href="class_inflator.html#e219ede9a3c7342d6c9262f87c8a571d">m_inQueue</a>.<a class="code" href="class_byte_queue.html#003ce4b0f9525589327800d0a14b455f">CurrentSize</a>() &lt; MaxPrestreamHeaderSize())
<a name="l00325"></a>00325                                 <span class="keywordflow">return</span>;
<a name="l00326"></a>00326                         ProcessPrestreamHeader();
<a name="l00327"></a>00327                         m_state = WAIT_HEADER;
<a name="l00328"></a>00328                         m_wrappedAround = <span class="keyword">false</span>;
<a name="l00329"></a>00329                         m_current = 0;
<a name="l00330"></a>00330                         m_lastFlush = 0;
<a name="l00331"></a>00331                         m_window.<a class="code" href="class_sec_block.html#90d46e577c951d81a2d25a4742a3e979" title="change size, without preserving contents">New</a>(1 &lt;&lt; <a class="code" href="class_inflator.html#7fe2a4d58871276c8df5a8bae21229dc">GetLog2WindowSize</a>());
<a name="l00332"></a>00332                         <span class="keywordflow">break</span>;
<a name="l00333"></a>00333                 <span class="keywordflow">case</span> WAIT_HEADER:
<a name="l00334"></a>00334                         {
<a name="l00335"></a>00335                         <span class="comment">// maximum number of bytes before actual compressed data starts</span>
<a name="l00336"></a>00336                         <span class="keyword">const</span> <span class="keywordtype">size_t</span> MAX_HEADER_SIZE = BitsToBytes(3+5+5+4+19*7+286*15+19*15);
<a name="l00337"></a>00337                         <span class="keywordflow">if</span> (<a class="code" href="class_inflator.html#e219ede9a3c7342d6c9262f87c8a571d">m_inQueue</a>.<a class="code" href="class_byte_queue.html#003ce4b0f9525589327800d0a14b455f">CurrentSize</a>() &lt; (flush ? 1 : MAX_HEADER_SIZE))
<a name="l00338"></a>00338                                 <span class="keywordflow">return</span>;
<a name="l00339"></a>00339                         DecodeHeader();
<a name="l00340"></a>00340                         <span class="keywordflow">break</span>;
<a name="l00341"></a>00341                         }
<a name="l00342"></a>00342                 <span class="keywordflow">case</span> DECODING_BODY: