📄 basecode_8cpp-source.html
字号:
<!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++: basecode.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>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><a class="code" href="class_base_n___encoder.html#3489c960fafc6ae65a8749133646901b">00013</a> 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>, <a class="code" href="namespace_name.html#55fc7c0f55a4b8d8bfbea7bae9a9ae18">Name::EncodingLookupArray</a>(), m_alphabet);<a name="l00016"></a>00016 <a name="l00017"></a>00017 parameters.GetRequiredIntParameter(<span class="stringliteral">"BaseN_Encoder"</span>, <a class="code" href="namespace_name.html#e7c6ebc7562274e23f87906719f67480">Name::Log2Base</a>(), 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(<a class="code" href="namespace_name.html#3da7c465fc9bdfca310d55928d2ee8a2">Name::PaddingByte</a>(), padding))<a name="l00024"></a>00024 pad = parameters.GetValueWithDefault(<a class="code" href="namespace_name.html#b7fb5e98db5dda84252e01a7d06492a5">Name::Pad</a>(), <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#db9ab1b4d48de6c26b04d4691be2f0f0">00039</a> <span class="keywordtype">size_t</span> <a class="code" href="class_base_n___encoder.html#db9ab1b4d48de6c26b04d4691be2f0f0" 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> (<a class="code" href="class_filter.html#5efea4f6caff4dca805c831a911eb1db">m_inputPosition</a> < 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[<a class="code" href="class_filter.html#5efea4f6caff4dca805c831a911eb1db">m_inputPosition</a>++], 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><a class="code" href="class_base_n___decoder.html#7c82c37a6626042f2e0eb65307e039b7">00106</a> <span class="keywordtype">void</span> <a class="code" href="class_base_n___decoder.html#7c82c37a6626042f2e0eb65307e039b7">BaseN_Decoder::IsolatedInitialize</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)<a name="l00107"></a>00107 {<a name="l00108"></a>00108 parameters.<a class="code" href="class_name_value_pairs.html#c66048d3bc2a741712486d02e1f75d78">GetRequiredParameter</a>(<span class="stringliteral">"BaseN_Decoder"</span>, <a class="code" href="namespace_name.html#c1e139c8ca48f86140ed48dd32f288b3">Name::DecodingLookupArray</a>(), m_lookup);<a name="l00109"></a>00109 <a name="l00110"></a>00110 parameters.<a class="code" href="class_name_value_pairs.html#1e6596c87ad9c2bb7f2a4d7b2194b949">GetRequiredIntParameter</a>(<span class="stringliteral">"BaseN_Decoder"</span>, <a class="code" href="namespace_name.html#e7c6ebc7562274e23f87906719f67480">Name::Log2Base</a>(), 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>);⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -