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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
//------------------------------------------------------------------------------
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/*
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Copyright (c) 2011-2013, OpenCoin, Inc.
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*/
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//==============================================================================
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#ifndef RIPPLE_SECUREALLOCATOR_H
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#define RIPPLE_SECUREALLOCATOR_H
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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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{
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typedef secure_allocator<_Other> other;
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};
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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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#endif
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