template project, first version

DirectXTK/Src/BinaryReader.h

@@ -0,0 +1,75 @@
+//--------------------------------------------------------------------------------------
+// File: BinaryReader.h
+//
+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
+// PARTICULAR PURPOSE.
+//
+// Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// http://go.microsoft.com/fwlink/?LinkId=248929
+//--------------------------------------------------------------------------------------
+
+#pragma once
+
+#include <memory>
+#include <exception>
+#include <stdexcept>
+#include <type_traits>
+
+#include "PlatformHelpers.h"
+
+
+namespace DirectX
+{
+    // Helper for reading binary data, either from the filesystem a memory buffer.
+    class BinaryReader
+    {
+    public:
+        explicit BinaryReader(_In_z_ wchar_t const* fileName);
+        BinaryReader(_In_reads_bytes_(dataSize) uint8_t const* dataBlob, size_t dataSize);
+
+        BinaryReader(BinaryReader const&) = delete;
+        BinaryReader& operator= (BinaryReader const&) = delete;
+        
+        // Reads a single value.
+        template<typename T> T const& Read()
+        {
+            return *ReadArray<T>(1);
+        }
+
+
+        // Reads an array of values.
+        template<typename T> T const* ReadArray(size_t elementCount)
+        {
+            static_assert(std::is_pod<T>::value, "Can only read plain-old-data types");
+
+            uint8_t const* newPos = mPos + sizeof(T) * elementCount;
+
+            if (newPos < mPos)
+                throw std::overflow_error("ReadArray");
+
+            if (newPos > mEnd)
+                throw std::exception("End of file");
+
+            auto result = reinterpret_cast<T const*>(mPos);
+
+            mPos = newPos;
+
+            return result;
+        }
+
+
+        // Lower level helper reads directly from the filesystem into memory.
+        static HRESULT ReadEntireFile(_In_z_ wchar_t const* fileName, _Inout_ std::unique_ptr<uint8_t[]>& data, _Out_ size_t* dataSize);
+
+
+    private:
+        // The data currently being read.
+        uint8_t const* mPos;
+        uint8_t const* mEnd;
+
+        std::unique_ptr<uint8_t[]> mOwnedData;
+    };
+}