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123 lines
4.2 KiB
123 lines
4.2 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto |
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// Copyright (c) 2009-2012 The Bitcoin developers |
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// Distributed under the MIT/X11 software license, see the accompanying |
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// file license.txt or http://www.opensource.org/licenses/mit-license.php. |
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#ifndef BITCOIN_ALLOCATORS_H |
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#define BITCOIN_ALLOCATORS_H |
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#include <string.h> |
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#include <string> |
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#ifdef WIN32 |
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#ifdef _WIN32_WINNT |
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#undef _WIN32_WINNT |
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#endif |
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#define _WIN32_WINNT 0x0501 |
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#define WIN32_LEAN_AND_MEAN 1 |
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#ifndef NOMINMAX |
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#define NOMINMAX |
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#endif |
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#include <windows.h> |
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// This is used to attempt to keep keying material out of swap |
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// Note that VirtualLock does not provide this as a guarantee on Windows, |
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// but, in practice, memory that has been VirtualLock'd almost never gets written to |
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// the pagefile except in rare circumstances where memory is extremely low. |
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#define mlock(p, n) VirtualLock((p), (n)); |
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#define munlock(p, n) VirtualUnlock((p), (n)); |
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#else |
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#include <sys/mman.h> |
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#include <limits.h> |
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/* This comes from limits.h if it's not defined there set a sane default */ |
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#ifndef PAGESIZE |
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#include <unistd.h> |
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#define PAGESIZE sysconf(_SC_PAGESIZE) |
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#endif |
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#define mlock(a,b) \ |
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mlock(((void *)(((size_t)(a)) & (~((PAGESIZE)-1)))),\ |
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(((((size_t)(a)) + (b) - 1) | ((PAGESIZE) - 1)) + 1) - (((size_t)(a)) & (~((PAGESIZE) - 1)))) |
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#define munlock(a,b) \ |
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munlock(((void *)(((size_t)(a)) & (~((PAGESIZE)-1)))),\ |
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(((((size_t)(a)) + (b) - 1) | ((PAGESIZE) - 1)) + 1) - (((size_t)(a)) & (~((PAGESIZE) - 1)))) |
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#endif |
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// |
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// Allocator that locks its contents from being paged |
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// out of memory and clears its contents before deletion. |
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// |
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template<typename T> |
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struct secure_allocator : public std::allocator<T> |
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{ |
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// MSVC8 default copy constructor is broken |
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typedef std::allocator<T> base; |
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typedef typename base::size_type size_type; |
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typedef typename base::difference_type difference_type; |
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typedef typename base::pointer pointer; |
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typedef typename base::const_pointer const_pointer; |
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typedef typename base::reference reference; |
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typedef typename base::const_reference const_reference; |
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typedef typename base::value_type value_type; |
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secure_allocator() throw() {} |
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secure_allocator(const secure_allocator& a) throw() : base(a) {} |
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template <typename U> |
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secure_allocator(const secure_allocator<U>& a) throw() : base(a) {} |
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~secure_allocator() throw() {} |
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template<typename _Other> struct rebind |
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{ typedef secure_allocator<_Other> other; }; |
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T* allocate(std::size_t n, const void *hint = 0) |
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{ |
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T *p; |
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p = std::allocator<T>::allocate(n, hint); |
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if (p != NULL) |
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mlock(p, sizeof(T) * n); |
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return p; |
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} |
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void deallocate(T* p, std::size_t n) |
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{ |
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if (p != NULL) |
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{ |
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memset(p, 0, sizeof(T) * n); |
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munlock(p, sizeof(T) * n); |
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} |
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std::allocator<T>::deallocate(p, n); |
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} |
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}; |
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// |
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// Allocator that clears its contents before deletion. |
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// |
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template<typename T> |
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struct zero_after_free_allocator : public std::allocator<T> |
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{ |
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// MSVC8 default copy constructor is broken |
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typedef std::allocator<T> base; |
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typedef typename base::size_type size_type; |
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typedef typename base::difference_type difference_type; |
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typedef typename base::pointer pointer; |
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typedef typename base::const_pointer const_pointer; |
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typedef typename base::reference reference; |
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typedef typename base::const_reference const_reference; |
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typedef typename base::value_type value_type; |
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zero_after_free_allocator() throw() {} |
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zero_after_free_allocator(const zero_after_free_allocator& a) throw() : base(a) {} |
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template <typename U> |
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zero_after_free_allocator(const zero_after_free_allocator<U>& a) throw() : base(a) {} |
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~zero_after_free_allocator() throw() {} |
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template<typename _Other> struct rebind |
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{ typedef zero_after_free_allocator<_Other> other; }; |
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void deallocate(T* p, std::size_t n) |
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{ |
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if (p != NULL) |
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memset(p, 0, sizeof(T) * n); |
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std::allocator<T>::deallocate(p, n); |
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} |
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}; |
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// This is exactly like std::string, but with a custom allocator. |
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// (secure_allocator<> is defined in serialize.h) |
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typedef std::basic_string<char, std::char_traits<char>, secure_allocator<char> > SecureString; |
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#endif
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