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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Crypto++: filters.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul></div><h1>filters.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// filters.cpp - written and placed in the public domain by Wei Dai</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="preprocessor">#include "pch.h"</span><a name="l00004"></a>00004 <a name="l00005"></a>00005 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span><a name="l00006"></a>00006 <span class="preprocessor"></span><a name="l00007"></a>00007 <span class="preprocessor">#include "filters.h"</span><a name="l00008"></a>00008 <span class="preprocessor">#include "mqueue.h"</span><a name="l00009"></a>00009 <span class="preprocessor">#include "fltrimpl.h"</span><a name="l00010"></a>00010 <span class="preprocessor">#include "argnames.h"</span><a name="l00011"></a>00011 <span class="preprocessor">#include <memory></span><a name="l00012"></a>00012 <span class="preprocessor">#include <functional></span><a name="l00013"></a>00013 <a name="l00014"></a>00014 NAMESPACE_BEGIN(CryptoPP)<a name="l00015"></a>00015 <a name="l00016"></a><a class="code" href="class_filter.html#3c1c355eb02ae048020785d335bad6b3">00016</a> <a class="code" href="class_filter.html" title="provides an implementation of BufferedTransformation's attachment interface">Filter</a>::<a class="code" href="class_filter.html" title="provides an implementation of BufferedTransformation's attachment interface">Filter</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> *attachment)<a name="l00017"></a>00017 : m_attachment(attachment), m_continueAt(0)<a name="l00018"></a>00018 {<a name="l00019"></a>00019 }<a name="l00020"></a>00020 <a name="l00021"></a><a class="code" href="class_filter.html#2fa24cba6c39fe232baa67f293ca47cd">00021</a> <a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> * <a class="code" href="class_filter.html#2fa24cba6c39fe232baa67f293ca47cd">Filter::NewDefaultAttachment</a>()<span class="keyword"> const</span><a name="l00022"></a>00022 <span class="keyword"></span>{<a name="l00023"></a>00023 <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="class_message_queue.html" title="Message Queue.">MessageQueue</a>;<a name="l00024"></a>00024 }<a name="l00025"></a>00025 <a name="l00026"></a><a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93">00026</a> <a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> * <a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">Filter::AttachedTransformation</a>()<a name="l00027"></a>00027 {<a name="l00028"></a>00028 <span class="keywordflow">if</span> (m_attachment.<a class="code" href="classmember__ptr.html#2d10dec2a51691b589d56b71ec78e59a">get</a>() == NULL)<a name="l00029"></a>00029 m_attachment.<a class="code" href="classmember__ptr.html#0191c833924d93e9093b07bab31010fe">reset</a>(<a class="code" href="class_filter.html#2fa24cba6c39fe232baa67f293ca47cd">NewDefaultAttachment</a>());<a name="l00030"></a>00030 <span class="keywordflow">return</span> m_attachment.<a class="code" href="classmember__ptr.html#2d10dec2a51691b589d56b71ec78e59a">get</a>();<a name="l00031"></a>00031 }<a name="l00032"></a>00032 <a name="l00033"></a><a class="code" href="class_filter.html#049148324c63bda47ac676f64e113b26">00033</a> <span class="keyword">const</span> <a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> *<a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">Filter::AttachedTransformation</a>()<span class="keyword"> const</span><a name="l00034"></a>00034 <span class="keyword"></span>{<a name="l00035"></a>00035 <span class="keywordflow">if</span> (m_attachment.<a class="code" href="classmember__ptr.html#2d10dec2a51691b589d56b71ec78e59a">get</a>() == NULL)<a name="l00036"></a>00036 const_cast<Filter *>(<span class="keyword">this</span>)->m_attachment.reset(<a class="code" href="class_filter.html#2fa24cba6c39fe232baa67f293ca47cd">NewDefaultAttachment</a>());<a name="l00037"></a>00037 <span class="keywordflow">return</span> m_attachment.<a class="code" href="classmember__ptr.html#2d10dec2a51691b589d56b71ec78e59a">get</a>();<a name="l00038"></a>00038 }<a name="l00039"></a>00039 <a name="l00040"></a><a class="code" href="class_filter.html#93817876b45172108fe0342de6442f75">00040</a> <span class="keywordtype">void</span> <a class="code" href="class_filter.html#93817876b45172108fe0342de6442f75" title="delete the current attachment chain and replace it with newAttachment">Filter::Detach</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> *newOut)<a name="l00041"></a>00041 {<a name="l00042"></a>00042 m_attachment.<a class="code" href="classmember__ptr.html#0191c833924d93e9093b07bab31010fe">reset</a>(newOut);<a name="l00043"></a>00043 }<a name="l00044"></a>00044 <a name="l00045"></a><a class="code" href="class_filter.html#3aff43294dee9f9b853c7ff96e694a2f">00045</a> <span class="keywordtype">void</span> <a class="code" href="class_filter.html#3aff43294dee9f9b853c7ff96e694a2f">Filter::Insert</a>(<a class="code" href="class_filter.html" title="provides an implementation of BufferedTransformation's attachment interface">Filter</a> *filter)<a name="l00046"></a>00046 {<a name="l00047"></a>00047 filter-><a class="code" href="class_filter.html#4cc6235b5b01578d2efd7a00b91a032e">m_attachment</a>.<a class="code" href="classmember__ptr.html#0191c833924d93e9093b07bab31010fe">reset</a>(m_attachment.<a class="code" href="classmember__ptr.html#3e2476e6f94e4f472b1ae3cf26d94a16">release</a>());<a name="l00048"></a>00048 m_attachment.<a class="code" href="classmember__ptr.html#0191c833924d93e9093b07bab31010fe">reset</a>(filter);<a name="l00049"></a>00049 }<a name="l00050"></a>00050 <a name="l00051"></a><a class="code" href="class_filter.html#d5ad8feab6f315b94e94f38a7866e4e6">00051</a> <span class="keywordtype">size_t</span> <a class="code" href="class_filter.html#d5ad8feab6f315b94e94f38a7866e4e6" title="upon return, begin contains the start position of data yet to be finished copying...">Filter::CopyRangeTo2</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &target, lword &begin, lword end, <span class="keyword">const</span> std::string &channel, <span class="keywordtype">bool</span> blocking)<span class="keyword"> const</span><a name="l00052"></a>00052 <span class="keyword"></span>{<a name="l00053"></a>00053 <span class="keywordflow">return</span> <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 class="code" href="class_buffered_transformation.html#0dd57085cd3e3340eb8d16d941332a6a" title="upon return, begin contains the start position of data yet to be finished copying...">CopyRangeTo2</a>(target, begin, end, channel, blocking);<a name="l00054"></a>00054 }<a name="l00055"></a>00055 <a name="l00056"></a><a class="code" href="class_filter.html#76cad0cf6ab20c2813f5e6d5ceb61d84">00056</a> <span class="keywordtype">size_t</span> <a class="code" href="class_filter.html#76cad0cf6ab20c2813f5e6d5ceb61d84" title="upon return, byteCount contains number of bytes that have finished being transfered...">Filter::TransferTo2</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &target, lword &transferBytes, <span class="keyword">const</span> std::string &channel, <span class="keywordtype">bool</span> blocking)<a name="l00057"></a>00057 {<a name="l00058"></a>00058 <span class="keywordflow">return</span> <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 class="code" href="class_buffered_transformation.html#041e8af260c474a43bd232cd4143f406" title="upon return, byteCount contains number of bytes that have finished being transfered...">TransferTo2</a>(target, transferBytes, channel, blocking);<a name="l00059"></a>00059 }<a name="l00060"></a>00060 <a name="l00061"></a><a class="code" href="class_filter.html#0c011bdc71755b373292e7a722e9e332">00061</a> <span class="keywordtype">void</span> <a class="code" href="class_filter.html#0c011bdc71755b373292e7a722e9e332" title="initialize or reinitialize this object">Filter::Initialize</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> &parameters, <span class="keywordtype">int</span> propagation)<a name="l00062"></a>00062 {<a name="l00063"></a>00063 <a class="code" href="class_filter.html#b57fb6112bb2cb7c018941bdcd7b4570">m_continueAt</a> = 0;<a name="l00064"></a>00064 <a class="code" href="class_buffered_transformation.html#7bb05ac3b6302e2ab994586d526fa804">IsolatedInitialize</a>(parameters);<a name="l00065"></a>00065 <a class="code" href="class_filter.html#3a24170e0e22a725ea7f0f706d9637a1">PropagateInitialize</a>(parameters, propagation);<a name="l00066"></a>00066 }<a name="l00067"></a>00067 <a name="l00068"></a><a class="code" href="class_filter.html#d845deb5113d2bd04d109c05abfd3098">00068</a> <span class="keywordtype">bool</span> <a class="code" href="class_filter.html#d845deb5113d2bd04d109c05abfd3098" title="flush buffered input and/or output">Filter::Flush</a>(<span class="keywordtype">bool</span> hardFlush, <span class="keywordtype">int</span> propagation, <span class="keywordtype">bool</span> blocking)<a name="l00069"></a>00069 {<a name="l00070"></a>00070 <span class="keywordflow">switch</span> (<a class="code" href="class_filter.html#b57fb6112bb2cb7c018941bdcd7b4570">m_continueAt</a>)<a name="l00071"></a>00071 {<a name="l00072"></a>00072 <span class="keywordflow">case</span> 0:<a name="l00073"></a>00073 <span class="keywordflow">if</span> (IsolatedFlush(hardFlush, blocking))<a name="l00074"></a>00074 <span class="keywordflow">return</span> <span class="keyword">true</span>;<a name="l00075"></a>00075 <span class="keywordflow">case</span> 1:<a name="l00076"></a>00076 <span class="keywordflow">if</span> (<a class="code" href="class_filter.html#b4bcb84ff32215c6c31432e83419ff55">OutputFlush</a>(1, hardFlush, propagation, blocking))<a name="l00077"></a>00077 <span class="keywordflow">return</span> <span class="keyword">true</span>;<a name="l00078"></a>00078 }<a name="l00079"></a>00079 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00080"></a>00080 }<a name="l00081"></a>00081 <a name="l00082"></a><a class="code" href="class_filter.html#a42c62587dda61266ac8195d9c9edb47">00082</a> <span class="keywordtype">bool</span> <a class="code" href="class_filter.html#a42c62587dda61266ac8195d9c9edb47" title="mark end of a series of messages">Filter::MessageSeriesEnd</a>(<span class="keywordtype">int</span> propagation, <span class="keywordtype">bool</span> blocking)<a name="l00083"></a>00083 {<a name="l00084"></a>00084 <span class="keywordflow">switch</span> (<a class="code" href="class_filter.html#b57fb6112bb2cb7c018941bdcd7b4570">m_continueAt</a>)<a name="l00085"></a>00085 {<a name="l00086"></a>00086 <span class="keywordflow">case</span> 0:<a name="l00087"></a>00087 <span class="keywordflow">if</span> (<a class="code" href="class_buffered_transformation.html#af09f0cd6dbd022539a9ac5c316d4984">IsolatedMessageSeriesEnd</a>(blocking))<a name="l00088"></a>00088 <span class="keywordflow">return</span> <span class="keyword">true</span>;<a name="l00089"></a>00089 <span class="keywordflow">case</span> 1:<a name="l00090"></a>00090 <span class="keywordflow">if</span> (<a class="code" href="class_filter.html#514be4042d3262aef0e89772b0be192b">ShouldPropagateMessageSeriesEnd</a>() && <a class="code" href="class_filter.html#255f83eaddd679a61326ce05c487fd2e">OutputMessageSeriesEnd</a>(1, propagation, blocking))<a name="l00091"></a>00091 <span class="keywordflow">return</span> <span class="keyword">true</span>;<a name="l00092"></a>00092 }⌨️ 快捷键说明
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