69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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// PARTICULAR PURPOSE.
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//
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// Copyright (c) Microsoft Corporation. All rights reserved
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#pragma once
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class CFile
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{
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public:
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CFile(UINT codePage = CP_ACP);
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virtual ~CFile();
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BOOL CreateFile(_In_ PCWSTR pFileName, DWORD desiredAccess, DWORD creationDisposition,
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DWORD sharedMode = 0, _Inout_opt_ LPSECURITY_ATTRIBUTES lpSecurityAttributes = nullptr, DWORD flagsAndAttributes = 0, _Inout_opt_ HANDLE templateFileHandle = nullptr);
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BOOL IsEndOfFile();
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VOID NextLine();
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_Ret_maybenull_
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const WCHAR *GetReadBufferPointer()
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{
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if (!_pReadBuffer)
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{
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if (!SetupReadBuffer())
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{
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return nullptr;
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}
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}
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return _pReadBuffer;
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}
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DWORD_PTR GetFileSize() { return _fileSize;}
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LPCWSTR GetFileName() { return _pFileName;}
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protected:
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virtual BOOL SetupReadBuffer();
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protected:
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const WCHAR* _pReadBuffer; // read buffer memory.
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DWORD_PTR _fileSize; // in byte.
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HANDLE _fileHandle; // file handle for CreateFile
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private:
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DWORD_PTR GetBufferInWCharLength()
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{
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if (_filePosPointer == 0 && _fileSize > 0)
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{
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// skip Unicode byte order mark
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GetReadBufferPointer();
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}
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return(_fileSize - _filePosPointer) / sizeof(WCHAR); // in char count as a returned length.
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}
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const WCHAR *GetBufferInWChar()
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{
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const WCHAR *pwch = GetReadBufferPointer();
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return(const WCHAR*)((BYTE*)pwch + _filePosPointer);
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}
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private:
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UINT _codePage; // used for MultiByteToWideChar
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DWORD_PTR _filePosPointer; // in byte. Always point start of line.
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LPWSTR _pFileName;
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};
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