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/*
* libfud
* Copyright 2024 Dominick Allen
*
* 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 FUD_MEMORY_HPP
#define FUD_MEMORY_HPP
#include "fud_result.hpp"
#include "fud_status.hpp"
#include <cstddef>
#include <cstdint>
#include <type_traits>
namespace fud {
/** \brief Copies from source to destination count bytes.
*
* \retcode FudStatus::Success
* \retcode FudStatus::NullPointer if destination or source are null
* \retcode FudStatus::InvalidInput if destination_size < count
*/
FudStatus copyMem(void* destination, size_t destination_size, const void* source, size_t count);
FudStatus compareMem(const void* lhs, size_t destination_size, const void* rhs, size_t count, int* difference);
Result<int, FudStatus> compareMem(const void* lhs, size_t destination_size, const void* rhs, size_t count);
FudStatus setMemory(void* data, size_t dataSize, uint8_t pattern, size_t count);
FudStatus setMemory(
void* data,
size_t collectionCount,
size_t eltOffset,
size_t eltSize,
uint8_t pattern,
size_t eltCount);
template <template <class, size_t> class Container, typename T, size_t Size>
constexpr void setMemory(Container<T, Size>& container, const T& value)
{
for (auto& elt : container) {
elt = value;
}
}
template <size_t Count, typename T, typename U>
void copyMem(T& destination, const U& source)
{
static_assert(Count <= sizeof(U));
static_assert(Count <= sizeof(T));
static_assert(std::is_standard_layout_v<T>);
static_assert(std::is_standard_layout_v<U>);
for (size_t idx = 0; idx < Count; ++idx) {
// NOLINTBEGIN(cppcoreguidelines-pro-type-reinterpret-cast)
reinterpret_cast<char*>(&destination)[idx] = reinterpret_cast<const char*>(&source)[idx];
// NOLINTEND(cppcoreguidelines-pro-type-reinterpret-cast)
}
}
template <typename T, typename U>
void copyMem(T& destination, const U& source)
{
static_assert(sizeof(U) <= sizeof(T));
copyMem<sizeof(U)>(destination, source);
}
template <size_t Count, typename T, typename U>
int compareMem(const T& lhs, const U& rhs)
{
static_assert(Count <= sizeof(T));
static_assert(Count <= sizeof(U));
int difference = 0;
for (size_t idx = 0; idx < Count; ++idx) {
// NOLINTBEGIN(cppcoreguidelines-pro-type-reinterpret-cast)
difference = reinterpret_cast<const uint8_t*>(&lhs)[idx] - reinterpret_cast<const uint8_t*>(&rhs)[idx];
// NOLINTEND(cppcoreguidelines-pro-type-reinterpret-cast)
if (difference != 0) {
break;
}
}
return difference;
}
template <size_t Count, typename T, typename U>
int compareMem(const T& lhs, U&& rhs)
{
static_assert(Count <= sizeof(T));
static_assert(Count <= sizeof(U));
U uRhs{std::forward<U>(rhs)};
int difference = 0;
for (size_t idx = 0; idx < Count; ++idx) {
// NOLINTBEGIN(cppcoreguidelines-pro-type-reinterpret-cast)
difference = reinterpret_cast<const uint8_t*>(&lhs)[idx] -
reinterpret_cast<const uint8_t*>(&uRhs)[idx];
// NOLINTEND(cppcoreguidelines-pro-type-reinterpret-cast)
if (difference != 0) {
break;
}
}
return difference;
}
template <typename T, typename U>
int compareMem(const T& lhs, const U& rhs)
{
static_assert(sizeof(U) == sizeof(T));
return compareMem<sizeof(U)>(lhs, rhs);
}
template <typename T, typename U>
int compareMem(const T& lhs, U&& rhs)
{
static_assert(sizeof(U) == sizeof(T));
return compareMem<sizeof(U)>(lhs, std::forward<U>(rhs));
}
} // namespace fud
#endif
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