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/* Copyright (c) 2014 Samsung Electronics Co.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*
*
* @file ckm-raw-buffer.h
* @author Krzysztof Jackiewicz (k.jackiewicz@samsung.com)
* @version 1.0
* @brief Custom allocator for std
*/
#ifndef _SAFE_BUFFER_H_
#define _SAFE_BUFFER_H_
#include <stddef.h>
#include <string.h>
#include <vector>
namespace CKM {
template <typename T>
struct std_erase_on_dealloc {
// MJK: if re-factoring, remember not to inherit from the std::allocator !
// MJK: to be replaced with much shorter version once std::allocator_traits
// becomes supported in STL containers (i.e. list, vector and string)
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef T *pointer;
typedef const T *const_pointer;
typedef T &reference;
typedef const T &const_reference;
typedef T value_type;
std_erase_on_dealloc() = default;
template <typename U>
std_erase_on_dealloc(const std_erase_on_dealloc<U> &) {}
T *allocate(std::size_t n)
{
return static_cast<T *>(::operator new(n * sizeof(T)));
}
void deallocate(T *ptr, std::size_t n)
{
// clear the memory before deleting
memset(ptr, 0 , n * sizeof(T));
::operator delete(ptr);
}
template<typename _Tp1>
struct rebind {
typedef std_erase_on_dealloc<_Tp1> other;
};
void construct(pointer p, const T &val)
{
new(p) T(val);
}
void destroy(pointer p)
{
p->~T();
}
size_type max_size() const
{
return size_type(-1);
}
};
template <typename T, typename U>
inline bool operator==(const std_erase_on_dealloc<T> &,
const std_erase_on_dealloc<U> &)
{
return true;
}
template <typename T, typename U>
inline bool operator!=(const std_erase_on_dealloc<T> &a,
const std_erase_on_dealloc<U> &b)
{
return !(a == b);
}
/*
* TODO replace with:
*
* template <typename T>
* using SafeBuffer = std::vector<T, erase_on_dealloc<T>>;
*
* typedef SafeBuffer<unsigned char> RawBuffer
*
* when gcc 4.7/4.8 is available.
*/
template <typename T>
struct SafeBuffer {
typedef std::vector<T, std_erase_on_dealloc<T>> Type;
};
// used to pass password and raw key data
typedef SafeBuffer<unsigned char>::Type RawBuffer;
} // namespace CKM
#endif //_SAFE_BUFFER_H_
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