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来自「Crypto++是一个非常强大的密码学库,主要是功能全」· HTML 代码 · 共 216 行
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Crypto++: files.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.2 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Compound List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Compound Members</a> | <a class="qindex" href="globals.html">File Members</a></div><h1>files.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// files.cpp - written and placed in the public domain by Wei Dai</span>00002 00003 <span class="preprocessor">#include "pch.h"</span>00004 00005 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span>00006 <span class="preprocessor"></span>00007 <span class="preprocessor">#include "files.h"</span>00008 00009 NAMESPACE_BEGIN(CryptoPP)00010 00011 <span class="keyword">using</span> <span class="keyword">namespace </span>std;00012 00013 <span class="keywordtype">void</span> Files_TestInstantiations()00014 {00015 <a class="code" href="class_file_store.html">FileStore</a> f0;00016 <a class="code" href="class_file_source.html">FileSource</a> f1;00017 <a class="code" href="class_file_sink.html">FileSink</a> f2;00018 }00019 00020 <span class="keywordtype">void</span> FileStore::StoreInitialize(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters)00021 {00022 m_file.reset(<span class="keyword">new</span> std::ifstream);00023 <span class="keyword">const</span> <span class="keywordtype">char</span> *fileName;00024 <span class="keywordflow">if</span> (parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha39">GetValue</a>(<span class="stringliteral">"InputFileName"</span>, fileName))00025 {00026 ios::openmode binary = parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha40">GetValueWithDefault</a>(<span class="stringliteral">"InputBinaryMode"</span>, <span class="keyword">true</span>) ? ios::binary : ios::openmode(0);00027 m_file->open(fileName, ios::in | binary);00028 <span class="keywordflow">if</span> (!*m_file)00029 <span class="keywordflow">throw</span> OpenErr(fileName);00030 m_stream = m_file.get();00031 }00032 <span class="keywordflow">else</span>00033 {00034 m_stream = NULL;00035 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha39">GetValue</a>(<span class="stringliteral">"InputStreamPointer"</span>, m_stream);00036 }00037 m_waiting = <span class="keyword">false</span>;00038 }00039 <a name="l00040"></a><a class="code" href="class_file_store.html#_file_storea4">00040</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <a class="code" href="class_file_store.html#_file_storea4">FileStore::MaxRetrievable</a>()<span class="keyword"> const</span>00041 <span class="keyword"></span>{00042 <span class="keywordflow">if</span> (!m_stream)00043 <span class="keywordflow">return</span> 0;00044 00045 streampos current = m_stream->tellg();00046 streampos end = m_stream->seekg(0, ios::end).tellg();00047 m_stream->seekg(current);00048 <span class="keywordflow">return</span> end-current;00049 }00050 <a name="l00051"></a><a class="code" href="class_file_store.html#_file_storea5">00051</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_file_store.html#_file_storea5">FileStore::Peek</a>(byte &outByte)<span class="keyword"> const</span>00052 <span class="keyword"></span>{00053 <span class="keywordflow">if</span> (!m_stream)00054 <span class="keywordflow">return</span> 0;00055 00056 <span class="keywordtype">int</span> result = m_stream->peek();00057 <span class="keywordflow">if</span> (result == EOF) <span class="comment">// GCC workaround: 2.95.2 doesn't have char_traits<char>::eof()</span>00058 <span class="keywordflow">return</span> 0;00059 <span class="keywordflow">else</span>00060 {00061 outByte = byte(result);00062 <span class="keywordflow">return</span> 1;00063 }00064 }00065 <a name="l00066"></a><a class="code" href="class_file_store.html#_file_storea6">00066</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_file_store.html#_file_storea6">FileStore::TransferTo2</a>(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &target, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> &transferBytes, <span class="keyword">const</span> std::string &channel, <span class="keywordtype">bool</span> blocking)00067 {00068 <span class="keywordflow">if</span> (!m_stream)00069 {00070 transferBytes = 0;00071 <span class="keywordflow">return</span> 0;00072 }00073 00074 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> size=transferBytes;00075 transferBytes = 0;00076 00077 <span class="keywordflow">if</span> (m_waiting)00078 <span class="keywordflow">goto</span> output;00079 00080 <span class="keywordflow">while</span> (size && m_stream->good())00081 {00082 {00083 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> spaceSize = 1024;00084 m_space = HelpCreatePutSpace(target, channel, 1, (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)STDMIN(size, (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>)UINT_MAX), spaceSize);00085 00086 m_stream->read((<span class="keywordtype">char</span> *)m_space, STDMIN(size, (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>)spaceSize));00087 }00088 m_len = m_stream->gcount();00089 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blockedBytes;00090 output:00091 blockedBytes = target.<a class="code" href="class_buffered_transformation.html#_zlib_decompressorz13_9">ChannelPutModifiable2</a>(channel, m_space, m_len, 0, blocking);00092 m_waiting = blockedBytes > 0;00093 <span class="keywordflow">if</span> (m_waiting)00094 <span class="keywordflow">return</span> blockedBytes;00095 size -= m_len;00096 transferBytes += m_len;00097 }00098 00099 <span class="keywordflow">if</span> (!m_stream->good() && !m_stream->eof())00100 <span class="keywordflow">throw</span> ReadErr();00101 00102 <span class="keywordflow">return</span> 0;00103 }00104 00105 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> FileStore::CopyRangeTo2(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &target, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> &begin, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> end, <span class="keyword">const</span> std::string &channel, <span class="keywordtype">bool</span> blocking)<span class="keyword"> const</span>00106 <span class="keyword"></span>{00107 <span class="keywordflow">if</span> (!m_stream)00108 <span class="keywordflow">return</span> 0;00109 00110 <span class="comment">// TODO: figure out what happens on cin</span>00111 streampos current = m_stream->tellg();00112 streampos endPosition = m_stream->seekg(0, ios::end).tellg();00113 streampos newPosition = current + (streamoff)begin;00114 00115 <span class="keywordflow">if</span> (newPosition >= endPosition)00116 {00117 m_stream->seekg(current);00118 <span class="keywordflow">return</span> 0; <span class="comment">// don't try to seek beyond the end of file</span>00119 }00120 m_stream->seekg(newPosition);00121 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> total = 0;00122 <span class="keywordflow">try</span>00123 {00124 assert(!m_waiting);00125 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> copyMax = end-begin;00126 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blockedBytes = const_cast<FileStore *>(<span class="keyword">this</span>)->TransferTo2(target, copyMax, channel, blocking);00127 begin += copyMax;00128 <span class="keywordflow">if</span> (blockedBytes)00129 {00130 const_cast<FileStore *>(<span class="keyword">this</span>)->m_waiting = <span class="keyword">false</span>;00131 <span class="keywordflow">return</span> blockedBytes;00132 }00133 }00134 <span class="keywordflow">catch</span>(...)00135 {00136 m_stream->clear();00137 m_stream->seekg(current);00138 <span class="keywordflow">throw</span>;00139 }00140 m_stream->clear();00141 m_stream->seekg(current);00142 00143 <span class="keywordflow">return</span> 0;00144 }00145 <a name="l00146"></a><a class="code" href="class_file_store.html#_file_storea8">00146</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <a class="code" href="class_file_store.html#_file_storea8">FileStore::Skip</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> skipMax)00147 {00148 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> oldPos = m_stream->tellg();00149 m_stream->seekg(skipMax, ios_base::cur);00150 <span class="keywordflow">return</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>)m_stream->tellg() - oldPos;00151 }00152 00153 <span class="keywordtype">void</span> FileSink::IsolatedInitialize(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters)00154 {00155 m_file.reset(<span class="keyword">new</span> std::ofstream);00156 <span class="keyword">const</span> <span class="keywordtype">char</span> *fileName;00157 <span class="keywordflow">if</span> (parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha39">GetValue</a>(<span class="stringliteral">"OutputFileName"</span>, fileName))00158 {00159 ios::openmode binary = parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha40">GetValueWithDefault</a>(<span class="stringliteral">"OutputBinaryMode"</span>, <span class="keyword">true</span>) ? ios::binary : ios::openmode(0);00160 m_file->open(fileName, ios::out | ios::trunc | binary);00161 <span class="keywordflow">if</span> (!*m_file)00162 <span class="keywordflow">throw</span> OpenErr(fileName);00163 m_stream = m_file.get();00164 }00165 <span class="keywordflow">else</span>00166 {00167 m_stream = NULL;00168 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha39">GetValue</a>(<span class="stringliteral">"OutputStreamPointer"</span>, m_stream);00169 }00170 }00171 00172 <span class="keywordtype">bool</span> FileSink::IsolatedFlush(<span class="keywordtype">bool</span> hardFlush, <span class="keywordtype">bool</span> blocking)00173 {00174 <span class="keywordflow">if</span> (!m_stream)00175 <span class="keywordflow">throw</span> Err(<span class="stringliteral">"FileSink: output stream not opened"</span>);00176 00177 m_stream->flush();00178 <span class="keywordflow">if</span> (!m_stream->good())00179 <span class="keywordflow">throw</span> WriteErr();00180 00181 <span class="keywordflow">return</span> <span class="keyword">false</span>;00182 }00183 <a name="l00184"></a><a class="code" href="class_file_sink.html#_file_sinka5">00184</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_file_sink.html#_file_sinka5">FileSink::Put2</a>(<span class="keyword">const</span> byte *inString, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking)00185 {00186 <span class="keywordflow">if</span> (!m_stream)00187 <span class="keywordflow">throw</span> Err(<span class="stringliteral">"FileSink: output stream not opened"</span>);00188 00189 m_stream->write((<span class="keyword">const</span> <span class="keywordtype">char</span> *)inString, length);00190 00191 <span class="keywordflow">if</span> (messageEnd)00192 m_stream->flush();00193 00194 <span class="keywordflow">if</span> (!m_stream->good())00195 <span class="keywordflow">throw</span> WriteErr();00196 00197 <span class="keywordflow">return</span> 0;00198 }00199 00200 NAMESPACE_END00201 00202 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:14 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img 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