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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++: misc.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>misc.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// misc.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 "misc.h"</span><a name="l00008"></a>00008 <span class="preprocessor">#include "words.h"</span><a name="l00009"></a>00009 <span class="preprocessor">#include <new></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 xorbuf(byte *buf, const byte *mask, <span class="keywordtype">size_t</span> count)<a name="l00014"></a>00014 {<a name="l00015"></a>00015 <span class="keywordtype">size_t</span> i;<a name="l00016"></a>00016 <a name="l00017"></a>00017 <span class="keywordflow">if</span> (IsAligned<word32>(buf) && IsAligned<word32>(mask))<a name="l00018"></a>00018 {<a name="l00019"></a>00019 <span class="preprocessor"> #if defined(WORD64_AVAILABLE) && !defined(CRYPTOPP_SLOW_WORD64)</span><a name="l00020"></a>00020 <span class="preprocessor"></span> <span class="keywordflow">if</span> (IsAligned<word64>(buf) && IsAligned<word64>(mask))<a name="l00021"></a>00021 {<a name="l00022"></a>00022 <span class="keywordflow">for</span> (i=0; i<count/8; i++)<a name="l00023"></a>00023 ((word64*)buf)[i] ^= ((word64*)mask)[i];<a name="l00024"></a>00024 count -= 8*i;<a name="l00025"></a>00025 <span class="keywordflow">if</span> (!count)<a name="l00026"></a>00026 <span class="keywordflow">return</span>;<a name="l00027"></a>00027 buf += 8*i;<a name="l00028"></a>00028 mask += 8*i;<a name="l00029"></a>00029 }<a name="l00030"></a>00030 <span class="preprocessor"> #endif</span><a name="l00031"></a>00031 <span class="preprocessor"></span><a name="l00032"></a>00032 <span class="keywordflow">for</span> (i=0; i<count/4; i++)<a name="l00033"></a>00033 ((word32*)buf)[i] ^= ((word32*)mask)[i];<a name="l00034"></a>00034 count -= 4*i;<a name="l00035"></a>00035 <span class="keywordflow">if</span> (!count)<a name="l00036"></a>00036 <span class="keywordflow">return</span>;<a name="l00037"></a>00037 buf += 4*i;<a name="l00038"></a>00038 mask += 4*i;<a name="l00039"></a>00039 }<a name="l00040"></a>00040 <a name="l00041"></a>00041 <span class="keywordflow">for</span> (i=0; i<count; i++)<a name="l00042"></a>00042 buf[i] ^= mask[i];<a name="l00043"></a>00043 }<a name="l00044"></a>00044 <a name="l00045"></a>00045 <span class="keywordtype">void</span> xorbuf(byte *output, <span class="keyword">const</span> byte *input, <span class="keyword">const</span> byte *mask, <span class="keywordtype">size_t</span> count)<a name="l00046"></a>00046 {<a name="l00047"></a>00047 <span class="keywordtype">size_t</span> i;<a name="l00048"></a>00048 <a name="l00049"></a>00049 <span class="keywordflow">if</span> (IsAligned<word32>(output) && IsAligned<word32>(input) && IsAligned<word32>(mask))<a name="l00050"></a>00050 {<a name="l00051"></a>00051 <span class="preprocessor"> #if defined(WORD64_AVAILABLE) && !defined(CRYPTOPP_SLOW_WORD64)</span><a name="l00052"></a>00052 <span class="preprocessor"></span> <span class="keywordflow">if</span> (IsAligned<word64>(output) && IsAligned<word64>(input) && IsAligned<word64>(mask))<a name="l00053"></a>00053 {<a name="l00054"></a>00054 <span class="keywordflow">for</span> (i=0; i<count/8; i++)<a name="l00055"></a>00055 ((word64*)output)[i] = ((word64*)input)[i] ^ ((word64*)mask)[i];<a name="l00056"></a>00056 count -= 8*i;<a name="l00057"></a>00057 <span class="keywordflow">if</span> (!count)<a name="l00058"></a>00058 <span class="keywordflow">return</span>;<a name="l00059"></a>00059 output += 8*i;<a name="l00060"></a>00060 input += 8*i;<a name="l00061"></a>00061 mask += 8*i;<a name="l00062"></a>00062 }<a name="l00063"></a>00063 <span class="preprocessor"> #endif</span><a name="l00064"></a>00064 <span class="preprocessor"></span><a name="l00065"></a>00065 <span class="keywordflow">for</span> (i=0; i<count/4; i++)<a name="l00066"></a>00066 ((word32*)output)[i] = ((word32*)input)[i] ^ ((word32*)mask)[i];<a name="l00067"></a>00067 count -= 4*i;<a name="l00068"></a>00068 <span class="keywordflow">if</span> (!count)<a name="l00069"></a>00069 <span class="keywordflow">return</span>;<a name="l00070"></a>00070 output += 4*i;<a name="l00071"></a>00071 input += 4*i;<a name="l00072"></a>00072 mask += 4*i;<a name="l00073"></a>00073 }<a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="keywordflow">for</span> (i=0; i<count; i++)<a name="l00076"></a>00076 output[i] = input[i] ^ mask[i];<a name="l00077"></a>00077 }<a name="l00078"></a>00078 <a name="l00079"></a>00079 <span class="preprocessor">#if !(defined(_MSC_VER) && (_MSC_VER < 1300))</span><a name="l00080"></a>00080 <span class="preprocessor"></span><span class="keyword">using</span> std::new_handler;<a name="l00081"></a>00081 <span class="keyword">using</span> std::set_new_handler;<a name="l00082"></a>00082 <span class="preprocessor">#endif</span><a name="l00083"></a>00083 <span class="preprocessor"></span><a name="l00084"></a>00084 <span class="keywordtype">void</span> CallNewHandler()<a name="l00085"></a>00085 {<a name="l00086"></a>00086 new_handler newHandler = set_new_handler(NULL);<a name="l00087"></a>00087 <span class="keywordflow">if</span> (newHandler)<a name="l00088"></a>00088 set_new_handler(newHandler);<a name="l00089"></a>00089 <a name="l00090"></a>00090 <span class="keywordflow">if</span> (newHandler)<a name="l00091"></a>00091 newHandler();<a name="l00092"></a>00092 <span class="keywordflow">else</span><a name="l00093"></a>00093 <span class="keywordflow">throw</span> std::bad_alloc();<a name="l00094"></a>00094 }<a name="l00095"></a>00095 <a name="l00096"></a>00096 NAMESPACE_END<a name="l00097"></a>00097 <a name="l00098"></a>00098 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:22 2007 for Crypto++ by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address></body></html>⌨️ 快捷键说明
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