786b395266
It's removed in C++20 Bug: 175635923 Test: m MODULES-IN-system-vold Change-Id: Ief2875bfd3e2d2e5023ad4c0bb754a616fd42419
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
/*
|
|
* Copyright (C) 2017 The Android Open Source Project
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef ANDROID_VOLD_KEYBUFFER_H
|
|
#define ANDROID_VOLD_KEYBUFFER_H
|
|
|
|
#include <string.h>
|
|
#include <memory>
|
|
#include <type_traits>
|
|
#include <vector>
|
|
|
|
namespace android {
|
|
namespace vold {
|
|
|
|
// Allocator that delegates useful work to standard one but zeroes data before deallocating.
|
|
class ZeroingAllocator : public std::allocator<char> {
|
|
public:
|
|
void deallocate(value_type* p, size_type n) {
|
|
memset_explicit(p, 0, n);
|
|
std::allocator<char>::deallocate(p, n);
|
|
}
|
|
|
|
template <class Other>
|
|
struct rebind {
|
|
static_assert(std::is_same_v<char, Other>, "ZeroingAllocator is only defined for char");
|
|
using other = ZeroingAllocator;
|
|
};
|
|
};
|
|
|
|
// Char vector that zeroes memory when deallocating.
|
|
using KeyBuffer = std::vector<char, ZeroingAllocator>;
|
|
|
|
// Convenience methods to concatenate key buffers.
|
|
KeyBuffer operator+(KeyBuffer&& lhs, const KeyBuffer& rhs);
|
|
KeyBuffer operator+(KeyBuffer&& lhs, const char* rhs);
|
|
|
|
} // namespace vold
|
|
} // namespace android
|
|
|
|
#endif
|