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125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
//*********************************************************
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//
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// Copyright (c) Microsoft. All rights reserved.
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// This code is licensed under the MIT License.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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// PARTICULAR PURPOSE AND NONINFRINGEMENT.
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//
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//*********************************************************
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#ifndef __WIL_STL_INCLUDED
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#define __WIL_STL_INCLUDED
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#include "common.h"
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#include "resource.h"
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#include <memory>
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#include <string>
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#if defined(WIL_ENABLE_EXCEPTIONS)
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namespace std
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{
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template<class _Ty, class _Alloc>
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class vector;
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template<class _Elem>
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struct char_traits;
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template<class _Elem, class _Traits, class _Alloc>
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class basic_string;
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} // namespace std
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namespace wil
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{
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/** Secure allocator for STL containers.
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The `wil::secure_allocator` allocator calls `SecureZeroMemory` before deallocating
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memory. This provides a mechanism for secure STL containers such as `wil::secure_vector`,
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`wil::secure_string`, and `wil::secure_wstring`. */
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template <typename T>
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struct secure_allocator
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: public std::allocator<T>
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{
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template<typename Other>
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struct rebind
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{
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typedef secure_allocator<Other> other;
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};
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secure_allocator()
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: std::allocator<T>()
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{
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}
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~secure_allocator() = default;
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secure_allocator(const secure_allocator& a)
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: std::allocator<T>(a)
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{
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}
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template <class U>
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secure_allocator(const secure_allocator<U>& a)
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: std::allocator<T>(a)
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{
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}
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T* allocate(size_t n)
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{
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return std::allocator<T>::allocate(n);
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}
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void deallocate(T* p, size_t n)
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{
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SecureZeroMemory(p, 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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//! `wil::secure_vector` will be securely zeroed before deallocation.
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template <typename Type>
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using secure_vector = std::vector<Type, secure_allocator<Type>>;
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//! `wil::secure_wstring` will be securely zeroed before deallocation.
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using secure_wstring = std::basic_string<wchar_t, std::char_traits<wchar_t>, wil::secure_allocator<wchar_t>>;
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//! `wil::secure_string` will be securely zeroed before deallocation.
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using secure_string = std::basic_string<char, std::char_traits<char>, wil::secure_allocator<char>>;
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/// @cond
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namespace details
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{
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template<> struct string_maker<std::wstring>
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{
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HRESULT make(_In_reads_opt_(length) PCWSTR source, size_t length) WI_NOEXCEPT try
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{
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m_value = source ? std::wstring(source, length) : std::wstring(length, L'\0');
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return S_OK;
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}
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catch (...)
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{
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return E_OUTOFMEMORY;
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}
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wchar_t* buffer() { return &m_value[0]; }
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std::wstring release() { return std::wstring(std::move(m_value)); }
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static PCWSTR get(const std::wstring& value) { return value.c_str(); }
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private:
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std::wstring m_value;
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};
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}
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/// @endcond
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// str_raw_ptr is an overloaded function that retrieves a const pointer to the first character in a string's buffer.
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// This is the overload for std::wstring. Other overloads available in resource.h.
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inline PCWSTR str_raw_ptr(const std::wstring& str)
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{
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return str.c_str();
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}
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} // namespace wil
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#endif // WIL_ENABLE_EXCEPTIONS
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#endif // __WIL_STL_INCLUDED
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