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<h1>basecode.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// basecode.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 "basecode.h"</span>
<a name="l00008"></a>00008 <span class="preprocessor">#include "fltrimpl.h"</span>
<a name="l00009"></a>00009 <span class="preprocessor">#include <ctype.h></span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 NAMESPACE_BEGIN(CryptoPP)
<a name="l00012"></a>00012
<a name="l00013"></a>00013 void <a class="code" href="class_base_n___encoder.html" title="base n encoder, where n is a power of 2">BaseN_Encoder</a>::IsolatedInitialize(const <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &parameters)
<a name="l00014"></a>00014 {
<a name="l00015"></a>00015 parameters.GetRequiredParameter(<span class="stringliteral">"BaseN_Encoder"</span>, Name::EncodingLookupArray(), m_alphabet);
<a name="l00016"></a>00016
<a name="l00017"></a>00017 parameters.GetRequiredIntParameter(<span class="stringliteral">"BaseN_Encoder"</span>, Name::Log2Base(), m_bitsPerChar);
<a name="l00018"></a>00018 <span class="keywordflow">if</span> (m_bitsPerChar <= 0 || m_bitsPerChar >= 8)
<a name="l00019"></a>00019 <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">"BaseN_Encoder: Log2Base must be between 1 and 7 inclusive"</span>);
<a name="l00020"></a>00020
<a name="l00021"></a>00021 byte padding;
<a name="l00022"></a>00022 <span class="keywordtype">bool</span> pad;
<a name="l00023"></a>00023 <span class="keywordflow">if</span> (parameters.GetValue(Name::PaddingByte(), padding))
<a name="l00024"></a>00024 pad = parameters.GetValueWithDefault(Name::Pad(), <span class="keyword">true</span>);
<a name="l00025"></a>00025 <span class="keywordflow">else</span>
<a name="l00026"></a>00026 pad = <span class="keyword">false</span>;
<a name="l00027"></a>00027 m_padding = pad ? padding : -1;
<a name="l00028"></a>00028
<a name="l00029"></a>00029 m_bytePos = m_bitPos = 0;
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="keywordtype">int</span> i = 8;
<a name="l00032"></a>00032 <span class="keywordflow">while</span> (i%m_bitsPerChar != 0)
<a name="l00033"></a>00033 i += 8;
<a name="l00034"></a>00034 m_outputBlockSize = i/m_bitsPerChar;
<a name="l00035"></a>00035
<a name="l00036"></a>00036 m_outBuf.New(m_outputBlockSize);
<a name="l00037"></a>00037 }
<a name="l00038"></a>00038
<a name="l00039"></a><a class="code" href="class_base_n___encoder.html#adb9ab1b4d48de6c26b04d4691be2f0f0">00039</a> <span class="keywordtype">size_t</span> <a class="code" href="class_base_n___encoder.html#adb9ab1b4d48de6c26b04d4691be2f0f0" title="input multiple bytes for blocking or non-blocking processing">BaseN_Encoder::Put2</a>(<span class="keyword">const</span> byte *begin, <span class="keywordtype">size_t</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking)
<a name="l00040"></a>00040 {
<a name="l00041"></a>00041 FILTER_BEGIN;
<a name="l00042"></a>00042 <span class="keywordflow">while</span> (m_inputPosition < length)
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044 <span class="keywordflow">if</span> (m_bytePos == 0)
<a name="l00045"></a>00045 memset(m_outBuf, 0, m_outputBlockSize);
<a name="l00046"></a>00046
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> b = begin[m_inputPosition++], bitsLeftInSource = 8;
<a name="l00049"></a>00049 <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00050"></a>00050 {
<a name="l00051"></a>00051 assert(m_bitPos < m_bitsPerChar);
<a name="l00052"></a>00052 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bitsLeftInTarget = m_bitsPerChar-m_bitPos;
<a name="l00053"></a>00053 m_outBuf[m_bytePos] |= b >> (8-bitsLeftInTarget);
<a name="l00054"></a>00054 <span class="keywordflow">if</span> (bitsLeftInSource >= bitsLeftInTarget)
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056 m_bitPos = 0;
<a name="l00057"></a>00057 ++m_bytePos;
<a name="l00058"></a>00058 bitsLeftInSource -= bitsLeftInTarget;
<a name="l00059"></a>00059 <span class="keywordflow">if</span> (bitsLeftInSource == 0)
<a name="l00060"></a>00060 <span class="keywordflow">break</span>;
<a name="l00061"></a>00061 b <<= bitsLeftInTarget;
<a name="l00062"></a>00062 b &= 0xff;
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064 <span class="keywordflow">else</span>
<a name="l00065"></a>00065 {
<a name="l00066"></a>00066 m_bitPos += bitsLeftInSource;
<a name="l00067"></a>00067 <span class="keywordflow">break</span>;
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 }
<a name="l00071"></a>00071
<a name="l00072"></a>00072 assert(m_bytePos <= m_outputBlockSize);
<a name="l00073"></a>00073 <span class="keywordflow">if</span> (m_bytePos == m_outputBlockSize)
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075 <span class="keywordtype">int</span> i;
<a name="l00076"></a>00076 <span class="keywordflow">for</span> (i=0; i<m_bytePos; i++)
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 assert(m_outBuf[i] < (1 << m_bitsPerChar));
<a name="l00079"></a>00079 m_outBuf[i] = m_alphabet[m_outBuf[i]];
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081 FILTER_OUTPUT(1, m_outBuf, m_outputBlockSize, 0);
<a name="l00082"></a>00082
<a name="l00083"></a>00083 m_bytePos = m_bitPos = 0;
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086 <span class="keywordflow">if</span> (messageEnd)
<a name="l00087"></a>00087 {
<a name="l00088"></a>00088 <span class="keywordflow">if</span> (m_bitPos > 0)
<a name="l00089"></a>00089 ++m_bytePos;
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="keywordtype">int</span> i;
<a name="l00092"></a>00092 <span class="keywordflow">for</span> (i=0; i<m_bytePos; i++)
<a name="l00093"></a>00093 m_outBuf[i] = m_alphabet[m_outBuf[i]];
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="keywordflow">if</span> (m_padding != -1 && m_bytePos > 0)
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097 memset(m_outBuf+m_bytePos, m_padding, m_outputBlockSize-m_bytePos);
<a name="l00098"></a>00098 m_bytePos = m_outputBlockSize;
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100 FILTER_OUTPUT(2, m_outBuf, m_bytePos, messageEnd);
<a name="l00101"></a>00101 m_bytePos = m_bitPos = 0;
<a name="l00102"></a>00102 }
<a name="l00103"></a>00103 FILTER_END_NO_MESSAGE_END;
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="keywordtype">void</span> BaseN_Decoder::IsolatedInitialize(<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)
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108 parameters.GetRequiredParameter(<span class="stringliteral">"BaseN_Decoder"</span>, Name::DecodingLookupArray(), m_lookup);
<a name="l00109"></a>00109
<a name="l00110"></a>00110 parameters.GetRequiredIntParameter(<span class="stringliteral">"BaseN_Decoder"</span>, Name::Log2Base(), m_bitsPerChar);
<a name="l00111"></a>00111 <span class="keywordflow">if</span> (m_bitsPerChar <= 0 || m_bitsPerChar >= 8)
<a name="l00112"></a>00112 <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">"BaseN_Decoder: Log2Base must be between 1 and 7 inclusive"</span>);
<a name="l00113"></a>00113
<a name="l00114"></a>00114 m_bytePos = m_bitPos = 0;
<a name="l00115"></a>00115
<a name="l00116"></a>00116 <span class="keywordtype">int</span> i = m_bitsPerChar;
<a name="l00117"></a>00117 <span class="keywordflow">while</span> (i%8 != 0)
<a name="l00118"></a>00118 i += m_bitsPerChar;
<a name="l00119"></a>00119 m_outputBlockSize = i/8;
<a name="l00120"></a>00120
<a name="l00121"></a>00121 m_outBuf.<a class="code" href="class_sec_block.html#a90d46e577c951d81a2d25a4742a3e979" title="change size, without preserving contents">New</a>(m_outputBlockSize);
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a><a class="code" href="class_base_n___decoder.html#a56c46bd846fca139874903d26df4385f">00124</a> <span class="keywordtype">size_t</span> <a class="code" href="class_base_n___decoder.html#a56c46bd846fca139874903d26df4385f" title="input multiple bytes for blocking or non-blocking processing">BaseN_Decoder::Put2</a>(<span class="keyword">const</span> byte *begin, <span class="keywordtype">size_t</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking)
<a name="l00125"></a>00125 {
<a name="l00126"></a>00126 FILTER_BEGIN;
<a name="l00127"></a>00127 <span class="keywordflow">while</span> (m_inputPosition < length)
<a name="l00128"></a>00128 {
<a name="l00129"></a>00129 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> value;
<a name="l00130"></a>00130 value = m_lookup[begin[m_inputPosition++]];
<a name="l00131"></a>00131 <span class="keywordflow">if</span> (value >= 256)
<a name="l00132"></a>00132 <span class="keywordflow">continue</span>;
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="keywordflow">if</span> (m_bytePos == 0 && m_bitPos == 0)
<a name="l00135"></a>00135 memset(m_outBuf, 0, m_outputBlockSize);
<a name="l00136"></a>00136
<a name="l00137"></a>00137 {
<a name="l00138"></a>00138 <span class="keywordtype">int</span> newBitPos = m_bitPos + m_bitsPerChar;
<a name="l00139"></a>00139 <span class="keywordflow">if</span> (newBitPos <= 8)
<a name="l00140"></a>00140 m_outBuf[m_bytePos] |= value << (8-newBitPos);
<a name="l00141"></a>00141 <span class="keywordflow">else</span>
<a name="l00142"></a>00142 {
<a name="l00143"></a>00143 m_outBuf[m_bytePos] |= value >> (newBitPos-8);
<a name="l00144"></a>00144 m_outBuf[m_bytePos+1] |= value << (16-newBitPos);
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146
<a name="l00147"></a>00147 m_bitPos = newBitPos;
<a name="l00148"></a>00148 <span class="keywordflow">while</span> (m_bitPos >= 8)
<a name="l00149"></a>00149 {
<a name="l00150"></a>00150 m_bitPos -= 8;
<a name="l00151"></a>00151 ++m_bytePos;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154
<a name="l00155"></a>00155 <span class="keywordflow">if</span> (m_bytePos == m_outputBlockSize)
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 FILTER_OUTPUT(1, m_outBuf, m_outputBlockSize, 0);
<a name="l00158"></a>00158 m_bytePos = m_bitPos = 0;
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161 <span class="keywordflow">if</span> (messageEnd)
<a name="l00162"></a>00162 {
<a name="l00163"></a>00163 FILTER_OUTPUT(2, m_outBuf, m_bytePos, messageEnd);
<a name="l00164"></a>00164 m_bytePos = m_bitPos = 0;
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166 FILTER_END_NO_MESSAGE_END;
<a name="l00167"></a>00167 }
<a name="l00168"></a>00168
<a name="l00169"></a>00169 <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)
<a name="l00170"></a>00170 {
<a name="l00171"></a>00171 std::fill(lookup, lookup+256, -1);
<a name="l00172"></a>00172
<a name="l00173"></a>00173 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<base; i++)
<a name="l00174"></a>00174 {
<a name="l00175"></a>00175 <span class="keywordflow">if</span> (caseInsensitive && isalpha(alphabet[i]))
<a name="l00176"></a>00176 {
<a name="l00177"></a>00177 assert(lookup[toupper(alphabet[i])] == -1);
<a name="l00178"></a>00178 lookup[toupper(alphabet[i])] = i;
<a name="l00179"></a>00179 assert(lookup[tolower(alphabet[i])] == -1);
<a name="l00180"></a>00180 lookup[tolower(alphabet[i])] = i;
<a name="l00181"></a>00181 }
<a name="l00182"></a>00182 <span class="keywordflow">else</span>
<a name="l00183"></a>00183 {
<a name="l00184"></a>00184 assert(lookup[alphabet[i]] == -1);
<a name="l00185"></a>00185 lookup[alphabet[i]] = i;
<a name="l00186"></a>00186 }
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188 }
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="keywordtype">void</span> Grouper::IsolatedInitialize(<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)
<a name="l00191"></a>00191 {
<a name="l00192"></a>00192 m_groupSize = parameters.<a class="code" href="class_name_value_pairs.html#ac269314685b737912d3499f4a9399618" title="get a named value with type int, with default">GetIntValueWithDefault</a>(Name::GroupSize(), 0);
<a name="l00193"></a>00193 <a class="code" href="class_const_byte_array_parameter.html" title="used to pass byte array input as part of a NameValuePairs object">ConstByteArrayParameter</a> separator, terminator;
<a name="l00194"></a>00194 <span class="keywordflow">if</span> (m_groupSize)
<a name="l00195"></a>00195 parameters.GetRequiredParameter(<span class="stringliteral">"Grouper"</span>, Name::Separator(), separator);
<a name="l00196"></a>00196 <span class="keywordflow">else</span>
<a name="l00197"></a>00197 parameters.<a class="code" href="class_name_value_pairs.html#a96686e9f8d6ce3ab870e516fb72b608e" title="get a named value, returns true if the name exists">GetValue</a>(Name::Separator(), separator);
<a name="l00198"></a>00198 parameters.<a class="code" href="class_name_value_pairs.html#a96686e9f8d6ce3ab870e516fb72b608e" title="get a named value, returns true if the name exists">GetValue</a>(Name::Terminator(), terminator);
<a name="l00199"></a>00199
<a name="l00200"></a>00200 m_separator.<a class="code" href="class_sec_block.html#a2cf5dc5e31c63eb927f935af6104f36a" title="set contents and size">Assign</a>(separator.begin(), separator.size());
<a name="l00201"></a>00201 m_terminator.<a class="code" href="class_sec_block.html#a2cf5dc5e31c63eb927f935af6104f36a" title="set contents and size">Assign</a>(terminator.begin(), terminator.size());
<a name="l00202"></a>00202 m_counter = 0;
<a name="l00203"></a>00203 }
<a name="l00204"></a>00204
<a name="l00205"></a><a class="code" href="class_grouper.html#a21cb0add26fcf2607329927714f4e3bb">00205</a> <span class="keywordtype">size_t</span> <a class="code" href="class_grouper.html#a21cb0add26fcf2607329927714f4e3bb" title="input multiple bytes for blocking or non-blocking processing">Grouper::Put2</a>(<span class="keyword">const</span> byte *begin, <span class="keywordtype">size_t</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking)
<a name="l00206"></a>00206 {
<a name="l00207"></a>00207 FILTER_BEGIN;
<a name="l00208"></a>00208 <span class="keywordflow">if</span> (m_groupSize)
<a name="l00209"></a>00209 {
<a name="l00210"></a>00210 <span class="keywordflow">while</span> (m_inputPosition < length)
<a name="l00211"></a>00211 {
<a name="l00212"></a>00212 <span class="keywordflow">if</span> (m_counter == m_groupSize)
<a name="l00213"></a>00213 {
<a name="l00214"></a>00214 FILTER_OUTPUT(1, m_separator, m_separator.size(), 0);
<a name="l00215"></a>00215 m_counter = 0;
<a name="l00216"></a>00216 }
<a name="l00217"></a>00217
<a name="l00218"></a>00218 <span class="keywordtype">size_t</span> len;
<a name="l00219"></a>00219 FILTER_OUTPUT2(2, len = STDMIN(length-m_inputPosition, m_groupSize-m_counter),
<a name="l00220"></a>00220 begin+m_inputPosition, len, 0);
<a name="l00221"></a>00221 m_inputPosition += len;
<a name="l00222"></a>00222 m_counter += len;
<a name="l00223"></a>00223 }
<a name="l00224"></a>00224 }
<a name="l00225"></a>00225 <span class="keywordflow">else</span>
<a name="l00226"></a>00226 FILTER_OUTPUT(3, begin, length, 0);
<a name="l00227"></a>00227
<a name="l00228"></a>00228 <span class="keywordflow">if</span> (messageEnd)
<a name="l00229"></a>00229 {
<a name="l00230"></a>00230 FILTER_OUTPUT(4, m_terminator, m_terminator.size(), messageEnd);
<a name="l00231"></a>00231 m_counter = 0;
<a name="l00232"></a>00232 }
<a name="l00233"></a>00233 FILTER_END_NO_MESSAGE_END
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235
<a name="l00236"></a>00236 NAMESPACE_END
<a name="l00237"></a>00237
<a name="l00238"></a>00238 <span class="preprocessor">#endif</span>
</pre></div></div>
<hr size="1"/><address style="text-align: right;"><small>Generated on 9 Dec 2009 for Crypto++ by
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