140 lines
2.9 KiB
C++
140 lines
2.9 KiB
C++
/*//////////////////////////////////////////////////////////////////////////////
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//
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// File: filestrm.cpp
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//
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// Copyright (C) 1999 Microsoft Corporation. All Rights Reserved.
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//
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// @@BEGIN_MSINTERNAL
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//
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// History:
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// -@- (craigp) - created
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// -@- 09/23/99 (mikemarr) - copyright, started history
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// -@- 07/15/00 (andrewke) - replicated in DXVB dir
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//
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// @@END_MSINTERNAL
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//
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//////////////////////////////////////////////////////////////////////////////*/
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#include "Filestrm.h"
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CFileStream::CFileStream(LPCTSTR filename, BOOL bRead, BOOL bTruncate, HRESULT *error)
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{
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m_hfile = CreateFile(filename, bRead ? GENERIC_READ : GENERIC_WRITE, 0, NULL,
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(bTruncate ? CREATE_ALWAYS : OPEN_EXISTING), FILE_ATTRIBUTE_NORMAL,
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NULL);
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if (error)
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{
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ULONG foo = GetLastError();
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if (m_hfile == INVALID_HANDLE_VALUE)
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*error = E_FAIL;
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else
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*error = NOERROR;
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}
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m_cRef = 1;
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}
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CFileStream::~CFileStream()
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{
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CloseHandle(m_hfile);
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}
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STDMETHODIMP_(ULONG) CFileStream::AddRef(void)
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{
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return m_cRef++;
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}
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STDMETHODIMP_(ULONG) CFileStream::Release(void)
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{
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if (--m_cRef != 0)
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return m_cRef;
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delete this;
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return 0;
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}
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STDMETHODIMP CFileStream::QueryInterface(REFIID riid, LPVOID FAR *ppv)
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{
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*ppv=NULL;
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if (riid == IID_IUnknown)
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*ppv=(IUnknown*)this;
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else if (riid == IID_IStream)
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*ppv=(IStream*)this;
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else
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return E_NOINTERFACE;
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((LPUNKNOWN)*ppv)->AddRef();
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return NOERROR;
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}
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STDMETHODIMP CFileStream::Read(void __RPC_FAR *pv, ULONG cb, ULONG __RPC_FAR *pcbRead)
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{
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DWORD read;
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BOOL result = ReadFile(m_hfile, pv, cb, &read, NULL);
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if (pcbRead)
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*pcbRead = read;
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if (result)
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return S_OK;
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else
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return E_FAIL;
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}
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STDMETHODIMP CFileStream::Write(const void __RPC_FAR *pv, ULONG cb, ULONG __RPC_FAR *pcbWritten)
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{
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DWORD written;
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BOOL result = WriteFile(m_hfile, pv, cb, &written, NULL);
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if (pcbWritten)
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*pcbWritten = written;
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if (result)
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return S_OK;
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else
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return E_FAIL;
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}
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STDMETHODIMP CFileStream::Seek(LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER __RPC_FAR *plibNewPosition)
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{
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LONG movelow;
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LONG movehigh;
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movelow = dlibMove.LowPart;
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movehigh = dlibMove.HighPart;
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DWORD moveMethod;
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switch (dwOrigin)
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{
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case STREAM_SEEK_SET: moveMethod = FILE_BEGIN; break;
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case STREAM_SEEK_CUR: moveMethod = FILE_CURRENT; break;
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case STREAM_SEEK_END: moveMethod = FILE_END; break;
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default: return E_INVALIDARG;
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}
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DWORD result = SetFilePointer(m_hfile, movelow, &movehigh, moveMethod);
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if (plibNewPosition)
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{
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plibNewPosition->LowPart = result;
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plibNewPosition->HighPart = movehigh;
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}
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if (result != -1)
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return NOERROR;
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else
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return E_FAIL;
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}
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STDMETHODIMP CFileStream::Stat(STATSTG __RPC_FAR *pstatstg, DWORD grfStatFlag)
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{
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memset(pstatstg, 0, sizeof(STATSTG));
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pstatstg->pwcsName = NULL;
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pstatstg->type = STGTY_STREAM;
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pstatstg->cbSize.LowPart = GetFileSize(m_hfile, &pstatstg->cbSize.HighPart);
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return S_OK;
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}
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