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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2013 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
#define BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
#include "support/pagelocker.h"
#include <string>
//
// Allocator that locks its contents from being paged
// out of memory and clears its contents before deletion.
//
template <typename T>
struct secure_allocator : public std::allocator<T> {
// MSVC8 default copy constructor is broken
typedef std::allocator<T> base;
typedef typename base::size_type size_type;
typedef typename base::difference_type difference_type;
typedef typename base::pointer pointer;
typedef typename base::const_pointer const_pointer;
typedef typename base::reference reference;
typedef typename base::const_reference const_reference;
typedef typename base::value_type value_type;
secure_allocator() throw() {}
secure_allocator(const secure_allocator& a) throw() : base(a) {}
template <typename U>
secure_allocator(const secure_allocator<U>& a) throw() : base(a)
{
}
~secure_allocator() throw() {}
template <typename _Other>
struct rebind {
typedef secure_allocator<_Other> other;
};
T* allocate(std::size_t n, const void* hint = 0)
{
T* p;
p = std::allocator<T>::allocate(n, hint);
if (p != NULL)
LockedPageManager::Instance().LockRange(p, sizeof(T) * n);
return p;
}
void deallocate(T* p, std::size_t n)
{
if (p != NULL) {
memory_cleanse(p, sizeof(T) * n);
LockedPageManager::Instance().UnlockRange(p, sizeof(T) * n);
}
std::allocator<T>::deallocate(p, n);
}
};
// This is exactly like std::string, but with a custom allocator.
typedef std::basic_string<char, std::char_traits<char>, secure_allocator<char> > SecureString;
#endif // BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
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