memmappedfile-fix (#115)

Co-authored-by: Metehan Tuncbilek <mtuncbilek95@gmail.com>
Reviewed-by: Georg Hagen <georg.hagen@madvoxel.com>
Co-authored-by: mtuncbilek <metehan.tuncbilek@madvoxel.com>
Co-committed-by: mtuncbilek <metehan.tuncbilek@madvoxel.com>

openVulkanoCpp/IO/MemMappedFileWriteHelper.hpp

@@ -0,0 +1,48 @@
+/*
+* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include "IO/MemMappedFile.hpp"
+#include <filesystem>
+
+namespace OpenVulkano
+{
+	class MemMappedFileWriteHelper
+	{
+	public:
+		MemMappedFileWriteHelper(const std::filesystem::path& path, size_t maxFileSize);
+		~MemMappedFileWriteHelper();
+
+		[[nodiscard]] void* Data() const { return m_file->Data(); }
+		[[nodiscard]] size_t Size() const { return m_file->Size(); }
+
+		bool Resize(size_t newSize);
+		void Close();
+		bool Trim(size_t finalFileSize);
+
+		static constexpr size_t USE_CURRENT_FILE_SIZE = 0;
+
+	private:
+		MemMappedFile* m_file;
+		std::filesystem::path m_path;
+	};
+
+	class MemMappedFileWriter final
+	{
+	public:
+		MemMappedFileWriter(const std::filesystem::path& path, size_t maxFileSize);
+		~MemMappedFileWriter();
+
+		void Write(const char* data, size_t size);
+		void SetOffset(size_t offset) { m_writtenSize = offset; }
+		[[nodiscard]] size_t GetOffset() const { return m_writtenSize; }
+
+	private:
+		MemMappedFileWriteHelper m_helper;
+		size_t m_writtenSize = 0;
+	};
+}