Initial commit.

1 files changed, 127 insertions, 0 deletions

diff --git a/source/memory.cpp b/source/memory.cpp
new file mode 100644
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--- /dev/null
+++ b/source/memory.cpp
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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