mirror of
https://github.com/ncblakely/GiantsTools
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91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
//--------------------------------------------------------------------------------------
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// File: BinaryReader.cpp
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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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#include "pch.h"
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#include "BinaryReader.h"
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using namespace DirectX;
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// Constructor reads from the filesystem.
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BinaryReader::BinaryReader(_In_z_ wchar_t const* fileName) noexcept(false) :
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mPos(nullptr),
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mEnd(nullptr)
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{
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size_t dataSize;
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HRESULT hr = ReadEntireFile(fileName, mOwnedData, &dataSize);
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if (FAILED(hr))
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{
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DebugTrace("ERROR: BinaryReader failed (%08X) to load '%ls'\n",
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static_cast<unsigned int>(hr), fileName);
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throw std::exception("BinaryReader");
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}
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mPos = mOwnedData.get();
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mEnd = mOwnedData.get() + dataSize;
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}
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// Constructor reads from an existing memory buffer.
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BinaryReader::BinaryReader(_In_reads_bytes_(dataSize) uint8_t const* dataBlob, size_t dataSize) noexcept :
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mPos(dataBlob),
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mEnd(dataBlob + dataSize)
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{
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}
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// Reads from the filesystem into memory.
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HRESULT BinaryReader::ReadEntireFile(_In_z_ wchar_t const* fileName, _Inout_ std::unique_ptr<uint8_t[]>& data, _Out_ size_t* dataSize)
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{
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// Open the file.
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#if (_WIN32_WINNT >= _WIN32_WINNT_WIN8)
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ScopedHandle hFile(safe_handle(CreateFile2(fileName, GENERIC_READ, FILE_SHARE_READ, OPEN_EXISTING, nullptr)));
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#else
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ScopedHandle hFile(safe_handle(CreateFileW(fileName, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr)));
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#endif
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if (!hFile)
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return HRESULT_FROM_WIN32(GetLastError());
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// Get the file size.
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FILE_STANDARD_INFO fileInfo;
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if (!GetFileInformationByHandleEx(hFile.get(), FileStandardInfo, &fileInfo, sizeof(fileInfo)))
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{
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return HRESULT_FROM_WIN32(GetLastError());
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}
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// File is too big for 32-bit allocation, so reject read.
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if (fileInfo.EndOfFile.HighPart > 0)
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return E_FAIL;
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// Create enough space for the file data.
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data.reset(new uint8_t[fileInfo.EndOfFile.LowPart]);
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if (!data)
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return E_OUTOFMEMORY;
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// Read the data in.
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DWORD bytesRead = 0;
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if (!ReadFile(hFile.get(), data.get(), fileInfo.EndOfFile.LowPart, &bytesRead, nullptr))
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{
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return HRESULT_FROM_WIN32(GetLastError());
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}
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if (bytesRead < fileInfo.EndOfFile.LowPart)
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return E_FAIL;
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*dataSize = bytesRead;
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return S_OK;
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}
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