mirror of
https://github.com/ncblakely/GiantsTools
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73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
//--------------------------------------------------------------------------------------
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// File: BinaryReader.h
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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//
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// http://go.microsoft.com/fwlink/?LinkId=248929
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// http://go.microsoft.com/fwlink/?LinkID=615561
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//--------------------------------------------------------------------------------------
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#pragma once
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#include <memory>
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#include <exception>
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#include <stdexcept>
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#include <type_traits>
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#include "PlatformHelpers.h"
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namespace DirectX
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{
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// Helper for reading binary data, either from the filesystem a memory buffer.
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class BinaryReader
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{
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public:
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explicit BinaryReader(_In_z_ wchar_t const* fileName) noexcept(false);
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BinaryReader(_In_reads_bytes_(dataSize) uint8_t const* dataBlob, size_t dataSize) noexcept;
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BinaryReader(BinaryReader const&) = delete;
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BinaryReader& operator= (BinaryReader const&) = delete;
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// Reads a single value.
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template<typename T> T const& Read()
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{
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return *ReadArray<T>(1);
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}
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// Reads an array of values.
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template<typename T> T const* ReadArray(size_t elementCount)
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{
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static_assert(std::is_pod<T>::value, "Can only read plain-old-data types");
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uint8_t const* newPos = mPos + sizeof(T) * elementCount;
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if (newPos < mPos)
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throw std::overflow_error("ReadArray");
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if (newPos > mEnd)
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throw std::exception("End of file");
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auto result = reinterpret_cast<T const*>(mPos);
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mPos = newPos;
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return result;
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}
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// Lower level helper reads directly from the filesystem into memory.
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static HRESULT ReadEntireFile(_In_z_ wchar_t const* fileName, _Inout_ std::unique_ptr<uint8_t[]>& data, _Out_ size_t* dataSize);
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private:
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// The data currently being read.
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uint8_t const* mPos;
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uint8_t const* mEnd;
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std::unique_ptr<uint8_t[]> mOwnedData;
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};
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}
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