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<h1>misc.cpp</h1><pre class="fragment"><div>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 <span class="preprocessor">#include <new></span>
00010
00011 NAMESPACE_BEGIN(CryptoPP)
00012
00013 void xorbuf(byte *buf, const byte *mask, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> count)
00014 {
00015 <span class="keywordflow">if</span> (((size_t)buf | (size_t)mask | count) % WORD_SIZE == 0)
00016 XorWords((word *)buf, (<span class="keyword">const</span> word *)mask, count/WORD_SIZE);
00017 <span class="keywordflow">else</span>
00018 {
00019 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<count; i++)
00020 buf[i] ^= mask[i];
00021 }
00022 }
00023
00024 <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)
00025 {
00026 <span class="keywordflow">if</span> (((size_t)output | (size_t)input | (size_t)mask | count) % WORD_SIZE == 0)
00027 XorWords((word *)output, (<span class="keyword">const</span> word *)input, (<span class="keyword">const</span> word *)mask, count/WORD_SIZE);
00028 <span class="keywordflow">else</span>
00029 {
00030 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<count; i++)
00031 output[i] = input[i] ^ mask[i];
00032 }
00033 }
00034
00035 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> Parity(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value)
00036 {
00037 <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)
00038 value ^= value >> i;
00039 <span class="keywordflow">return</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)value&1;
00040 }
00041
00042 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> BytePrecision(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value)
00043 {
00044 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
00045 <span class="keywordflow">for</span> (i=<span class="keyword">sizeof</span>(value); i; --i)
00046 <span class="keywordflow">if</span> (value >> (i-1)*8)
00047 <span class="keywordflow">break</span>;
00048
00049 <span class="keywordflow">return</span> i;
00050 }
00051
00052 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> BitPrecision(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value)
00053 {
00054 <span class="keywordflow">if</span> (!value)
00055 <span class="keywordflow">return</span> 0;
00056
00057 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> l=0, h=8*<span class="keyword">sizeof</span>(value);
00058
00059 <span class="keywordflow">while</span> (h-l > 1)
00060 {
00061 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> t = (l+h)/2;
00062 <span class="keywordflow">if</span> (value >> t)
00063 l = t;
00064 <span class="keywordflow">else</span>
00065 h = t;
00066 }
00067
00068 <span class="keywordflow">return</span> h;
00069 }
00070
00071 <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)
00072 {
00073 <span class="keywordflow">if</span> (size < 8*<span class="keyword">sizeof</span>(value))
00074 <span class="keywordflow">return</span> (value & ((1L << size) - 1));
00075 <span class="keywordflow">else</span>
00076 <span class="keywordflow">return</span> value;
00077 }
00078
00079 <span class="preprocessor">#if !(defined(_MSC_VER) && (_MSC_VER < 1300))</span>
00080 <span class="preprocessor"></span><span class="keyword">using</span> std::new_handler;
00081 <span class="keyword">using</span> std::set_new_handler;
00082 <span class="preprocessor">#endif</span>
00083 <span class="preprocessor"></span>
00084 <span class="keywordtype">void</span> CallNewHandler()
00085 {
00086 new_handler newHandler = set_new_handler(NULL);
00087 <span class="keywordflow">if</span> (newHandler)
00088 set_new_handler(newHandler);
00089
00090 <span class="keywordflow">if</span> (newHandler)
00091 newHandler();
00092 <span class="keywordflow">else</span>
00093 <span class="keywordflow">throw</span> std::bad_alloc();
00094 }
00095
00096 NAMESPACE_END
00097
00098 <span class="preprocessor">#endif</span>
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Sun Nov 7 08:23:58 2004 for Crypto++ by
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