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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++: basecode.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>basecode.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// basecode.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 "basecode.h"</span>00008 <span class="preprocessor">#include "fltrimpl.h"</span>00009 <span class="preprocessor">#include <ctype.h></span>00010 00011 NAMESPACE_BEGIN(CryptoPP)00012 00013 <span class="keywordtype">void</span> BaseN_Encoder::IsolatedInitialize(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters)00014 {00015 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha44">GetRequiredParameter</a>(<span class="stringliteral">"BaseN_Encoder"</span>, <span class="stringliteral">"EncodingLookupArray"</span>, m_alphabet);00016 00017 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha45">GetRequiredIntParameter</a>(<span class="stringliteral">"BaseN_Encoder"</span>, <span class="stringliteral">"Log2Base"</span>, m_bitsPerChar);00018 <span class="keywordflow">if</span> (m_bitsPerChar <= 0 || m_bitsPerChar >= 8)00019 <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html">InvalidArgument</a>(<span class="stringliteral">"BaseN_Encoder: Log2Base must be between 1 and 7 inclusive"</span>);00020 00021 byte padding;00022 <span class="keywordtype">bool</span> pad;00023 <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">"PaddingByte"</span>, padding))00024 pad = parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha40">GetValueWithDefault</a>(<span class="stringliteral">"Pad"</span>, <span class="keyword">true</span>);00025 <span class="keywordflow">else</span>00026 pad = <span class="keyword">false</span>;00027 m_padding = pad ? padding : -1;00028 00029 m_bytePos = m_bitPos = 0;00030 00031 <span class="keywordtype">int</span> i = 8;00032 <span class="keywordflow">while</span> (i%m_bitsPerChar != 0)00033 i += 8;00034 m_outputBlockSize = i/m_bitsPerChar;00035 00036 m_outBuf.New(m_outputBlockSize);00037 }00038 00039 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> BaseN_Encoder::Put2(<span class="keyword">const</span> byte *begin, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking)00040 {00041 FILTER_BEGIN;00042 <span class="keywordflow">while</span> (m_inputPosition < length)00043 {00044 <span class="keywordflow">if</span> (m_bytePos == 0)00045 memset(m_outBuf, 0, m_outputBlockSize);00046 00047 m_outBuf[m_bytePos] |= begin[m_inputPosition] >> (8-m_bitsPerChar+m_bitPos);00048 m_outBuf[m_bytePos+1] |= ((begin[m_inputPosition] << (m_bitsPerChar-m_bitPos)) & 0xff) >> (8-m_bitsPerChar);00049 ++m_inputPosition;00050 00051 m_bitPos += 8;00052 <span class="keywordflow">while</span> (m_bitPos >= m_bitsPerChar)00053 {00054 m_bitPos -= m_bitsPerChar;00055 ++m_bytePos;00056 }00057 00058 <span class="keywordflow">if</span> (m_bytePos == m_outputBlockSize)00059 {00060 <span class="keywordtype">int</span> i;00061 <span class="keywordflow">for</span> (i=0; i<m_bytePos; i++)00062 {00063 assert(m_outBuf[i] < (1 << m_bitsPerChar));00064 m_outBuf[i] = m_alphabet[m_outBuf[i]];00065 }00066 FILTER_OUTPUT(1, m_outBuf, m_outputBlockSize, 0);00067 00068 m_bytePos = m_bitPos = 0;00069 }00070 }00071 <span class="keywordflow">if</span> (messageEnd)00072 {00073 <span class="keywordflow">if</span> (m_bitPos > 0)00074 ++m_bytePos;00075 00076 <span class="keywordtype">int</span> i;00077 <span class="keywordflow">for</span> (i=0; i<m_bytePos; i++)00078 m_outBuf[i] = m_alphabet[m_outBuf[i]];00079 00080 <span class="keywordflow">if</span> (m_padding != -1 && m_bytePos > 0)00081 {00082 memset(m_outBuf+m_bytePos, m_padding, m_outputBlockSize-m_bytePos);00083 m_bytePos = m_outputBlockSize;00084 }00085 FILTER_OUTPUT(2, m_outBuf, m_bytePos, messageEnd);00086 m_bytePos = m_bitPos = 0;00087 }00088 FILTER_END;00089 }00090 00091 <span class="keywordtype">void</span> BaseN_Decoder::IsolatedInitialize(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters)00092 {00093 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha44">GetRequiredParameter</a>(<span class="stringliteral">"BaseN_Decoder"</span>, <span class="stringliteral">"DecodingLookupArray"</span>, m_lookup);00094 00095 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha45">GetRequiredIntParameter</a>(<span class="stringliteral">"BaseN_Decoder"</span>, <span class="stringliteral">"Log2Base"</span>, m_bitsPerChar);00096 <span class="keywordflow">if</span> (m_bitsPerChar <= 0 || m_bitsPerChar >= 8)00097 <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html">InvalidArgument</a>(<span class="stringliteral">"BaseN_Decoder: Log2Base must be between 1 and 7 inclusive"</span>);00098 00099 m_bytePos = m_bitPos = 0;00100 00101 <span class="keywordtype">int</span> i = m_bitsPerChar;00102 <span class="keywordflow">while</span> (i%8 != 0)00103 i += m_bitsPerChar;00104 m_outputBlockSize = i/8;00105 00106 m_outBuf.New(m_outputBlockSize);00107 }00108 00109 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> BaseN_Decoder::Put2(<span class="keyword">const</span> byte *begin, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking)00110 {00111 FILTER_BEGIN;00112 <span class="keywordflow">while</span> (m_inputPosition < length)00113 {00114 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> value;00115 value = m_lookup[begin[m_inputPosition++]];00116 <span class="keywordflow">if</span> (value >= 256)00117 <span class="keywordflow">continue</span>;00118 00119 <span class="keywordflow">if</span> (m_bytePos == 0 && m_bitPos == 0)00120 memset(m_outBuf, 0, m_outputBlockSize);00121 00122 {00123 <span class="keywordtype">int</span> newBitPos = m_bitPos + m_bitsPerChar;00124 <span class="keywordflow">if</span> (newBitPos <= 8)00125 m_outBuf[m_bytePos] |= value << (8-newBitPos);00126 <span class="keywordflow">else</span>00127 {00128 m_outBuf[m_bytePos] |= value >> (newBitPos-8);00129 m_outBuf[m_bytePos+1] |= value << (16-newBitPos);00130 }00131 00132 m_bitPos = newBitPos;00133 <span class="keywordflow">while</span> (m_bitPos >= 8)00134 {00135 m_bitPos -= 8;00136 ++m_bytePos;00137 }00138 }00139 00140 <span class="keywordflow">if</span> (m_bytePos == m_outputBlockSize)00141 {00142 FILTER_OUTPUT(1, m_outBuf, m_outputBlockSize, 0);00143 m_bytePos = m_bitPos = 0;00144 }00145 }00146 <span class="keywordflow">if</span> (messageEnd)00147 {00148 FILTER_OUTPUT(2, m_outBuf, m_bytePos, messageEnd);00149 m_bytePos = m_bitPos = 0;00150 }00151 FILTER_END_NO_MESSAGE_END;00152 }00153 00154 <span class="keywordtype">void</span> BaseN_Decoder::InitializeDecodingLookupArray(<span class="keywordtype">int</span> *lookup, <span class="keyword">const</span> byte *alphabet, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> base, <span class="keywordtype">bool</span> caseInsensitive)00155 {00156 std::fill(lookup, lookup+256, -1);00157 00158 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<base; i++)00159 {00160 <span class="keywordflow">if</span> (caseInsensitive && isalpha(alphabet[i]))00161 {00162 assert(lookup[toupper(alphabet[i])] == -1);00163 lookup[toupper(alphabet[i])] = i;00164 assert(lookup[tolower(alphabet[i])] == -1);00165 lookup[tolower(alphabet[i])] = i;00166 }00167 <span class="keywordflow">else</span>00168 {00169 assert(lookup[alphabet[i]] == -1);00170 lookup[alphabet[i]] = i;00171 }00172 }00173 }00174 00175 <span class="keywordtype">void</span> Grouper::IsolatedInitialize(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters)00176 {00177 m_groupSize = parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha43">GetIntValueWithDefault</a>(<span class="stringliteral">"GroupSize"</span>, 0);00178 <a class="code" href="class_const_byte_array_parameter.html">ConstByteArrayParameter</a> seperator, terminator;00179 <span class="keywordflow">if</span> (m_groupSize)00180 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha44">GetRequiredParameter</a>(<span class="stringliteral">"Grouper"</span>, <span class="stringliteral">"Seperator"</span>, seperator);00181 <span class="keywordflow">else</span>00182 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha39">GetValue</a>(<span class="stringliteral">"Seperator"</span>, seperator);00183 parameters.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha39">GetValue</a>(<span class="stringliteral">"Terminator"</span>, terminator);00184 00185 m_seperator.Assign(seperator.<a class="code" href="class_const_byte_array_parameter.html#_const_byte_array_parametera4">begin</a>(), seperator.<a class="code" href="class_const_byte_array_parameter.html#_const_byte_array_parametera6">size</a>());00186 m_terminator.Assign(terminator.<a class="code" href="class_const_byte_array_parameter.html#_const_byte_array_parametera4">begin</a>(), terminator.<a class="code" href="class_const_byte_array_parameter.html#_const_byte_array_parametera6">size</a>());00187 m_counter = 0;00188 }00189 00190 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> Grouper::Put2(<span class="keyword">const</span> byte *begin, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking)00191 {00192 <span class="keywordflow">if</span> (m_groupSize)00193 {00194 FILTER_BEGIN;00195 <span class="keywordflow">while</span> (m_inputPosition < length)00196 {00197 <span class="keywordflow">if</span> (m_counter == m_groupSize)00198 {00199 FILTER_OUTPUT(1, m_seperator, m_seperator.size(), 0);00200 m_counter = 0;00201 }00202 00203 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len;00204 FILTER_OUTPUT2(2, len = STDMIN(length-m_inputPosition, m_groupSize-m_counter),00205 begin+m_inputPosition, len, 0);00206 m_inputPosition += len;00207 m_counter += len;00208 }00209 <span class="keywordflow">if</span> (messageEnd)00210 FILTER_OUTPUT(3, m_terminator, m_terminator.size(), messageEnd);00211 FILTER_END_NO_MESSAGE_END00212 }00213 <span class="keywordflow">else</span>00214 <span class="keywordflow">return</span> Output(0, begin, length, messageEnd, blocking);00215 }00216 00217 NAMESPACE_END00218 00219 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:08 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.2 </small></address></body></html>⌨️ 快捷键说明
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