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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++: secblock.h 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>secblock.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// secblock.h - written and placed in the public domain by Wei Dai</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="preprocessor">#ifndef CRYPTOPP_SECBLOCK_H</span><a name="l00004"></a>00004 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_SECBLOCK_H</span><a name="l00005"></a>00005 <span class="preprocessor"></span><a name="l00006"></a>00006 <span class="preprocessor">#include "config.h"</span><a name="l00007"></a>00007 <span class="preprocessor">#include "misc.h"</span><a name="l00008"></a>00008 <span class="preprocessor">#include <string.h></span> <span class="comment">// CodeWarrior doesn't have memory.h</span><a name="l00009"></a>00009 <span class="preprocessor">#include <assert.h></span><a name="l00010"></a>00010 <a name="l00011"></a>00011 <span class="preprocessor">#if defined(CRYPTOPP_MEMALIGN_AVAILABLE) || defined(CRYPTOPP_MM_MALLOC_AVAILABLE)</span><a name="l00012"></a>00012 <span class="preprocessor"></span><span class="preprocessor"> #include <malloc.h></span><a name="l00013"></a>00013 <span class="preprocessor">#else</span><a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor"> #include <stdlib.h></span><a name="l00015"></a>00015 <span class="preprocessor">#endif</span><a name="l00016"></a>00016 <span class="preprocessor"></span><a name="l00017"></a>00017 NAMESPACE_BEGIN(CryptoPP)<a name="l00018"></a>00018 <a name="l00019"></a>00019 <span class="comment">// ************** secure memory allocation ***************</span><a name="l00020"></a>00020 <a name="l00021"></a>00021 template<class T><a name="l00022"></a><a class="code" href="class_allocator_base.html">00022</a> class <a class="code" href="class_allocator_base.html">AllocatorBase</a><a name="l00023"></a>00023 {<a name="l00024"></a>00024 <span class="keyword">public</span>:<a name="l00025"></a><a class="code" href="class_allocator_base.html#461f6d214f73761bb656a76db8f608c0">00025</a> <span class="keyword">typedef</span> T value_type;<a name="l00026"></a><a class="code" href="class_allocator_base.html#dda200f657efdba2d08e80ee9a7f244d">00026</a> <span class="keyword">typedef</span> <span class="keywordtype">size_t</span> size_type;<a name="l00027"></a>00027 <span class="preprocessor">#ifdef CRYPTOPP_MSVCRT6</span><a name="l00028"></a>00028 <span class="preprocessor"></span> <span class="keyword">typedef</span> ptrdiff_t difference_type;<a name="l00029"></a>00029 <span class="preprocessor">#else</span><a name="l00030"></a><a class="code" href="class_allocator_base.html#10c1b15630e208c28183b72debcff98c">00030</a> <span class="preprocessor"></span> <span class="keyword">typedef</span> std::ptrdiff_t difference_type;<a name="l00031"></a>00031 <span class="preprocessor">#endif</span><a name="l00032"></a><a class="code" href="class_allocator_base.html#719f87a9b5da234dbc8c8c1c88be253c">00032</a> <span class="preprocessor"></span> <span class="keyword">typedef</span> T * pointer;<a name="l00033"></a><a class="code" href="class_allocator_base.html#3ac778a475e77ea22ff8e7bea2aa983e">00033</a> <span class="keyword">typedef</span> <span class="keyword">const</span> T * const_pointer;<a name="l00034"></a><a class="code" href="class_allocator_base.html#151889fd23094bf841959ab226708f83">00034</a> <span class="keyword">typedef</span> T & reference;<a name="l00035"></a><a class="code" href="class_allocator_base.html#3ad08c82939fd8b18621a1d870a0d10e">00035</a> <span class="keyword">typedef</span> <span class="keyword">const</span> T & const_reference;<a name="l00036"></a>00036 <a name="l00037"></a><a class="code" href="class_allocator_base.html#9d7ddf797b14ff38e335357759cf0b8b">00037</a> pointer address(reference r)<span class="keyword"> const </span>{<span class="keywordflow">return</span> (&r);}<a name="l00038"></a><a class="code" href="class_allocator_base.html#eb51730b092c484ce8dd86dc078ed207">00038</a> const_pointer address(const_reference r)<span class="keyword"> const </span>{<span class="keywordflow">return</span> (&r); }<a name="l00039"></a><a class="code" href="class_allocator_base.html#4816881defdf38aa120c70a03b7da903">00039</a> <span class="keywordtype">void</span> construct(pointer p, <span class="keyword">const</span> T& val) {<span class="keyword">new</span> (p) T(val);}<a name="l00040"></a><a class="code" href="class_allocator_base.html#740cc02314cba092678ab0545fa6967b">00040</a> <span class="keywordtype">void</span> destroy(pointer p) {p->~T();}<a name="l00041"></a><a class="code" href="class_allocator_base.html#c2148e4d9df51a5b294eaf538e3f0074">00041</a> size_type max_size()<span class="keyword"> const </span>{<span class="keywordflow">return</span> ~size_type(0)/<span class="keyword">sizeof</span>(T);} <span class="comment">// switch to std::numeric_limits<T>::max later</span><a name="l00042"></a>00042 <a name="l00043"></a>00043 <span class="keyword">protected</span>:<a name="l00044"></a><a class="code" href="class_allocator_base.html#1ffea05c1944ec2b9f8fcff4cd9ee717">00044</a> <span class="keyword">static</span> <span class="keywordtype">void</span> CheckSize(<span class="keywordtype">size_t</span> n)<a name="l00045"></a>00045 {<a name="l00046"></a>00046 <span class="keywordflow">if</span> (n > ~<span class="keywordtype">size_t</span>(0) / <span class="keyword">sizeof</span>(T))<a name="l00047"></a>00047 <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">"AllocatorBase: requested size would cause integer overflow"</span>);<a name="l00048"></a>00048 }<a name="l00049"></a>00049 };<a name="l00050"></a>00050 <a name="l00051"></a>00051 <span class="preprocessor">#define CRYPTOPP_INHERIT_ALLOCATOR_TYPES \</span><a name="l00052"></a>00052 <span class="preprocessor">typedef typename AllocatorBase<T>::value_type value_type;\</span><a name="l00053"></a>00053 <span class="preprocessor">typedef typename AllocatorBase<T>::size_type size_type;\</span><a name="l00054"></a>00054 <span class="preprocessor">typedef typename AllocatorBase<T>::difference_type difference_type;\</span><a name="l00055"></a>00055 <span class="preprocessor">typedef typename AllocatorBase<T>::pointer pointer;\</span><a name="l00056"></a>00056 <span class="preprocessor">typedef typename AllocatorBase<T>::const_pointer const_pointer;\</span><a name="l00057"></a>00057 <span class="preprocessor">typedef typename AllocatorBase<T>::reference reference;\</span><a name="l00058"></a>00058 <span class="preprocessor">typedef typename AllocatorBase<T>::const_reference const_reference;</span><a name="l00059"></a>00059 <span class="preprocessor"></span><a name="l00060"></a>00060 <span class="preprocessor">#if defined(_MSC_VER) && (_MSC_VER < 1300)</span><a name="l00061"></a>00061 <span class="preprocessor"></span><span class="comment">// this pragma causes an internal compiler error if placed immediately before std::swap(a, b)</span><a name="l00062"></a>00062 <span class="preprocessor">#pragma warning(push)</span><a name="l00063"></a>00063 <span class="preprocessor"></span><span class="preprocessor">#pragma warning(disable: 4700) // VC60 workaround: don't know how to get rid of this warning</span><a name="l00064"></a>00064 <span class="preprocessor"></span><span class="preprocessor">#endif</span><a name="l00065"></a>00065 <span class="preprocessor"></span><a name="l00066"></a>00066 <span class="keyword">template</span> <<span class="keyword">class</span> T, <span class="keyword">class</span> A><a name="l00067"></a>00067 <span class="keyword">typename</span> A::pointer StandardReallocate(A& a, T *p, <span class="keyword">typename</span> A::size_type oldSize, <span class="keyword">typename</span> A::size_type newSize, <span class="keywordtype">bool</span> preserve)<a name="l00068"></a>00068 {<a name="l00069"></a>00069 <span class="keywordflow">if</span> (oldSize == newSize)<a name="l00070"></a>00070 <span class="keywordflow">return</span> p;<a name="l00071"></a>00071 <a name="l00072"></a>00072 <span class="keywordflow">if</span> (preserve)⌨️ 快捷键说明
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