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/*
* ExtLib
* 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.
*/
#include "memory.hpp"
#include <cstdint>
namespace fud {
FudStatus copyMem(void* destination, size_t destination_size, const void* source, size_t count)
{
if (anyAreNull(destination, source)) {
return FudStatus::NullPointer;
}
if (destination_size < count) {
return FudStatus::InvalidInput;
}
auto* destPtr = static_cast<uint8_t*>(destination);
const auto* sourcePtr = static_cast<const uint8_t*>(source);
for (decltype(destination_size) idx = 0; idx < count; ++idx) {
destPtr[idx] = sourcePtr[idx];
}
return FudStatus::Success;
}
FudStatus compareMem(const void* lhs, size_t destination_size, const void* rhs, size_t count, int* difference)
{
if (anyAreNull(lhs, rhs, difference)) {
return FudStatus::NullPointer;
}
if (destination_size < count) {
return FudStatus::InvalidInput;
}
int localDifference = 0;
// NOLINTBEGIN(readability-magic-numbers)
for (decltype(destination_size) idx = 0; idx < count; idx++) {
localDifference = static_cast<const uint8_t*>(lhs)[idx] - static_cast<const uint8_t*>(rhs)[idx];
if (localDifference != 0) {
*difference = localDifference;
return FudStatus::Success;
}
}
*difference = localDifference;
return FudStatus::Success;
}
Result<int, FudStatus> compareMem(const void* lhs, size_t destination_size, const void* rhs, size_t count)
{
int difference = 0;
auto status = compareMem(lhs, destination_size, rhs, count, &difference);
if (status != FudStatus::Success)
{
return Result<int, FudStatus>::error(status);
}
return Result<int, FudStatus>::okay(difference);
}
FudStatus setMemory(void* data, size_t dataSize, uint8_t pattern, size_t count)
{
if (data == nullptr)
{
return FudStatus::NullPointer;
}
if (count > dataSize)
{
return FudStatus::InvalidInput;
}
for (size_t idx = 0; idx < count; ++idx)
{
static_cast<uint8_t*>(data)[idx] = pattern;
}
return FudStatus::Success;
}
FudStatus setMemory(
void* data,
size_t collectionCount,
size_t eltOffset,
size_t eltSize,
uint8_t pattern,
size_t eltCount)
{
if (eltOffset >= collectionCount)
{
return FudStatus::InvalidInput;
}
if (eltOffset + eltCount > collectionCount)
{
return FudStatus::InvalidInput;
}
auto dataSize = collectionCount * eltSize;
auto byteOffset = eltOffset * eltSize;
auto byteCount = eltCount * eltSize;
auto remainingSize = dataSize - byteOffset;
auto* offsetData = static_cast<uint8_t*>(data) + byteOffset;
return setMemory(offsetData, remainingSize, pattern, byteCount);
}
} // namespace fud
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