winfile.cpp
上传用户:zhongxx05
上传日期:2007-06-06
资源大小:33641k
文件大小:10k
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #include "hxcom.h"
- #include "hxresult.h"
- #include "hxtypes.h"
- #include "hlxclib/sys/stat.h"
- #include "hlxclib/sys/types.h"
- #include "hxbuffer.h"
- #include "winfile.h"
- #include "hxfiles.h"
- #include "hlxclib/io.h"
- #include "hlxclib/fcntl.h"
- WinFile::WinFile()
- : m_lRefCount(0)
- , m_hFile(INVALID_HANDLE_VALUE)
- , m_pFilename(0)
- , m_ulPos(-1)
- {
- }
- WinFile::~WinFile()
- {
- if (m_hFile != INVALID_HANDLE_VALUE)
- {
- CloseHandle(m_hFile);
- m_hFile = INVALID_HANDLE_VALUE;
- }
- if (m_pFilename)
- {
- delete[] m_pFilename;
- m_pFilename = 0;
- }
- }
- /*
- * IUnknown methods
- */
- STDMETHODIMP
- WinFile::QueryInterface(REFIID riid,
- void** ppvObj)
- {
- if (IsEqualIID(IID_IUnknown, riid))
- {
- AddRef();
- *ppvObj = this;
- return HXR_OK;
- }
- else if(IsEqualIID(IID_IHXDataFile, riid))
- {
- AddRef();
- *ppvObj = (IHXDataFile*)this;
- return HXR_OK;
- }
- *ppvObj = 0;
- return HXR_NOINTERFACE;
- }
- STDMETHODIMP_(ULONG32)
- WinFile::AddRef()
- {
- return InterlockedIncrement(&m_lRefCount);
- }
- STDMETHODIMP_(ULONG32)
- WinFile::Release()
- {
- if (InterlockedDecrement(&m_lRefCount) > 0)
- {
- return m_lRefCount;
- }
- delete this;
- return 0;
- }
-
- /*
- * IHXDataFile methods
- */
- /* Bind DataFile Object with FileName */
- STDMETHODIMP_(void)
- WinFile::Bind(const char* FileName)
- {
- /* XXXPM
- if (m_hFile != INVALID_HANDLE_VALUE)
- {
- CloseHandle(m_hFile);
- m_hFile = INVALID_HANDLE_VALUE;
- }*/
- if (m_pFilename)
- {
- delete[] m_pFilename;
- m_pFilename = 0;
- }
- m_pFilename = new char[strlen(FileName) + 1];
- strcpy(m_pFilename, FileName); /* Flawfinder: ignore */
- }
- /* Creates a datafile using the specified mode
- * uOpenMode --- File Open mode - HX_FILE_READ/HX_FILE_WRITE/HX_FILE_BINARY
- */
- STDMETHODIMP
- WinFile::Create(UINT16 uOpenMode)
- {
- return HXR_NOTIMPL;
- }
- /* Open will open a file with the specified mode
- */
- STDMETHODIMP
- WinFile::Open(UINT16 uOpenMode)
- {
- if (m_hFile != INVALID_HANDLE_VALUE)
- {
- CloseHandle(m_hFile);
- m_hFile = INVALID_HANDLE_VALUE;
- }
- DWORD dwFlags = 0;
- DWORD dwShare = 0;
- DWORD dwCreate = 0;
- if (uOpenMode & HX_FILE_WRITE)
- {
- dwShare |= FILE_SHARE_WRITE;
- dwFlags |= GENERIC_WRITE;
- if (uOpenMode & HX_FILE_NOTRUNC)
- {
- dwCreate |= OPEN_ALWAYS;
- }
- else
- {
- dwCreate |= CREATE_ALWAYS;
- }
- }
- if (uOpenMode & HX_FILE_READ)
- {
- dwShare |= FILE_SHARE_READ;
- dwFlags |= GENERIC_READ;
- if (!(uOpenMode & HX_FILE_WRITE))
- {
- dwCreate |= OPEN_EXISTING;
- }
- }
- if (uOpenMode & HX_FILE_BINARY)
- {
- }
- m_hFile = CreateFile(OS_STRING(m_pFilename),
- dwFlags,
- dwShare,
- NULL,
- dwCreate,
- FILE_ATTRIBUTE_NORMAL,
- NULL);
- if (m_hFile == INVALID_HANDLE_VALUE)
- {
- return HXR_FAIL;
- }
- m_ulPos = 0;
- return HXR_OK;
-
- }
- /* Close closes a file
- * If the reference count on the IHXDataFile object is greater than 1,
- * then the underlying file cannot be safely closed, so Close() becomes
- * a noop in that case. Close it only when the object is destroyed.
- * This would be safe, but could lead to a file descriptor leak.
- */
- STDMETHODIMP
- WinFile::Close()
- {
- if (m_hFile != INVALID_HANDLE_VALUE)
- {
- CloseHandle(m_hFile);
- m_hFile = INVALID_HANDLE_VALUE;
- }
- m_ulPos = -1;
- return HXR_OK;
- }
- /* Name returns the currently bound file name in FileName.
- * and returns TRUE, if the a name has been bound. Otherwise
- * FALSE is returned.
- */
- STDMETHODIMP_(BOOL)
- WinFile::Name(REF(IHXBuffer*) pFileName)
- {
- if (!m_pFilename)
- {
- return FALSE;
- }
- pFileName = new CHXBuffer();
- pFileName->AddRef();
- pFileName->Set((const unsigned char*)m_pFilename,
- strlen(m_pFilename) + 1);
- return TRUE;
- }
- /*
- * IsOpen returns TRUE if file is open. Otherwise FALSE.
- */
- STDMETHODIMP_(BOOL)
- WinFile::IsOpen()
- {
- if (m_hFile != INVALID_HANDLE_VALUE)
- {
- return TRUE;
- }
- return FALSE;
- }
- /* Seek moves the current file position to the offset from the
- * fromWhere specifier returns current position of file or -1 on
- * error.
- */
- STDMETHODIMP
- WinFile::Seek(ULONG32 offset, UINT16 fromWhere)
- {
- DWORD fw = 0;
- switch (fromWhere)
- {
- case SEEK_CUR:
- fw = FILE_CURRENT;
- m_ulPos += offset;
- break;
- case SEEK_END:
- fw = FILE_END;
- if (offset > m_ulPos)
- {
- m_ulPos = 0;
- }
- else
- {
- m_ulPos -= offset;
- }
- break;
- case SEEK_SET:
- fw = FILE_BEGIN;
- m_ulPos = offset;
- break;
- }
- DWORD dwRet;
- dwRet = SetFilePointer(m_hFile,
- offset,
- NULL,
- fw);
-
- if (dwRet == -1)
- {
- m_ulPos = -1;
- return HXR_FAIL;
- }
-
- return 0;
- }
- /* Tell returns the current file position in the file */
- STDMETHODIMP_(ULONG32)
- WinFile::Tell()
- {
- return m_ulPos;
- }
- /* Read reads up to count bytes of data into buf.
- * returns the number of bytes read, EOF, or -1 if the read failed
- */
- STDMETHODIMP_(ULONG32)
- WinFile::Read(REF(IHXBuffer*) pBuf,
- ULONG32 count)
- {
- if (m_hFile == INVALID_HANDLE_VALUE)
- {
- pBuf = NULL;
- return 0;
- }
- pBuf = new CHXBuffer;
- pBuf->AddRef();
- pBuf->SetSize(count);
- BOOL bRet;
- UINT32 ulRead = 0;
- bRet = ReadFile(m_hFile,
- (void*)pBuf->GetBuffer(),
- count,
- &ulRead,
- NULL);
- if (ulRead < count)
- {
- pBuf->SetSize(ulRead);
- }
- return ulRead;
- }
- /* Write writes up to count bytes of data from buf.
- * returns the number of bytes written, or -1 if the write failed
- */
- STDMETHODIMP_(ULONG32)
- WinFile::Write(REF(IHXBuffer*) pBuf)
- {
- UINT32 ulWritten = 0;
- if (m_hFile == INVALID_HANDLE_VALUE)
- {
- return 0;
- }
- BOOL bRet;
- bRet = WriteFile(m_hFile,
- (void*)pBuf->GetBuffer(),
- pBuf->GetSize(),
- &ulWritten,
- NULL);
- return ulWritten;
- }
- /* Flush out the data in case of unbuffered I/O
- */
- STDMETHODIMP
- WinFile::Flush()
- {
- return HXR_NOTIMPL;
- }
- /*
- * Return info about the data file such as permissions, time of creation
- * size in bytes, etc.
- */
- STDMETHODIMP
- WinFile::Stat(struct stat* buffer)
- {
- if (!m_pFilename)
- {
- return HXR_UNEXPECTED;
- }
- int ret = _stat(m_pFilename, (struct _stat*)buffer);
- if (ret == 0)
- {
- return HXR_OK;
- }
- return HXR_FAIL;
- /*
- * XXXPM
- * This way is faster, but the times are incompatible with stat times.
- * Maybe someday I will convert.
- *
- BOOL bClose = 0;
- HANDLE hUse = m_hFile;
- if (hUse == INVALID_HANDLE_VALUE)
- {
- bClose = 1;
- hUse = CreateFile(m_pFilename,
- 0, //query
- FILE_SHARE_READ,
- NULL,
- OPEN_EXISTING,
- FILE_ATTRIBUTE_NORMAL,
- NULL);
- }
- if (hUse == INVALID_HANDLE_VALUE)
- {
- return HXR_FAIL;
- }
- BY_HANDLE_FILE_INFORMATION mss;
- memset(buffer, 0, sizeof(*buffer));
- buffer->st_nlink = 1;
-
- HX_RESULT res;
- if (GetFileInformationByHandle(hUse,
- &mss))
- {
- buffer->st_atime = mss.ftLastAccessTime.dwLowDateTime;
- buffer->st_ctime = mss.ftCreationTime.dwLowDateTime;
- buffer->st_mtime = mss.ftLastWriteTime.dwLowDateTime;
- buffer->st_size = mss.nFileSizeLow;
- res = HXR_OK;
- }
- else
- {
- res = HXR_FAIL;
- }
- if (bClose)
- {
- CloseHandle(hUse);
- }
- return res;
- */
- }
- /* Return the file descriptor */
- STDMETHODIMP_(INT16)
- WinFile::GetFd()
- {
- if (m_hFile != INVALID_HANDLE_VALUE)
- {
- return 1;
- }
- return -1;
- }
- /* GetLastError returns the platform specific file error */
- STDMETHODIMP
- WinFile::GetLastError()
- {
- return HXR_NOTIMPL;
- }
- /* GetLastError returns the platform specific file error in
- * string form.
- */
- STDMETHODIMP_(void)
- WinFile::GetLastError(REF(IHXBuffer*) err)
- {
- err = 0;
- return;
- }