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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++: misc.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>misc.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// misc.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 "misc.h"</span>00008 <span class="preprocessor">#include "words.h"</span>00009 00010 NAMESPACE_BEGIN(CryptoPP)00011 00012 <span class="keywordtype">void</span> xorbuf(byte *buf, <span class="keyword">const</span> byte *mask, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> count)00013 {00014 <span class="keywordflow">if</span> (((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)buf | (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)mask | count) % WORD_SIZE == 0)00015 XorWords((word *)buf, (<span class="keyword">const</span> word *)mask, count/WORD_SIZE);00016 <span class="keywordflow">else</span>00017 {00018 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<count; i++)00019 buf[i] ^= mask[i];00020 }00021 }00022 00023 <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">unsigned</span> <span class="keywordtype">int</span> count)00024 {00025 <span class="keywordflow">if</span> (((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)output | (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)input | (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)mask | count) % WORD_SIZE == 0)00026 XorWords((word *)output, (<span class="keyword">const</span> word *)input, (<span class="keyword">const</span> word *)mask, count/WORD_SIZE);00027 <span class="keywordflow">else</span>00028 {00029 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<count; i++)00030 output[i] = input[i] ^ mask[i];00031 }00032 }00033 00034 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> Parity(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value)00035 {00036 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=8*<span class="keyword">sizeof</span>(value)/2; i>0; i/=2)00037 value ^= value >> i;00038 <span class="keywordflow">return</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)value&1;00039 }00040 00041 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> BytePrecision(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value)00042 {00043 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;00044 <span class="keywordflow">for</span> (i=<span class="keyword">sizeof</span>(value); i; --i)00045 <span class="keywordflow">if</span> (value >> (i-1)*8)00046 <span class="keywordflow">break</span>;00047 00048 <span class="keywordflow">return</span> i;00049 }00050 00051 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> BitPrecision(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value)00052 {00053 <span class="keywordflow">if</span> (!value)00054 <span class="keywordflow">return</span> 0;00055 00056 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> l=0, h=8*<span class="keyword">sizeof</span>(value);00057 00058 <span class="keywordflow">while</span> (h-l > 1)00059 {00060 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> t = (l+h)/2;00061 <span class="keywordflow">if</span> (value >> t)00062 l = t;00063 <span class="keywordflow">else</span>00064 h = t;00065 }00066 00067 <span class="keywordflow">return</span> h;00068 }00069 00070 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> Crop(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)00071 {00072 <span class="keywordflow">if</span> (size < 8*<span class="keyword">sizeof</span>(value))00073 <span class="keywordflow">return</span> (value & ((1L << size) - 1));00074 <span class="keywordflow">else</span>00075 <span class="keywordflow">return</span> value;00076 }00077 00078 NAMESPACE_END00079 00080 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:20 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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