mmfile.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 "chxdataf.h"
- #include "platform/win/mmfile.h"
- #include "hlxclib/windows.h"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- BEGIN_INTERFACE_LIST(_CBufferWinMemMapped)
- INTERFACE_LIST_ENTRY(IID_IHXBuffer, IHXBuffer)
- END_INTERFACE_LIST
- UINT32
- _CBufferWinMemMapped::_AllocGran()
- {
- static UINT32 m_ulAllocGran = 0;
- if (!m_ulAllocGran)
- {
- SYSTEM_INFO sysinfCurrent;
- GetSystemInfo(&sysinfCurrent);
- m_ulAllocGran = sysinfCurrent.dwAllocationGranularity;
- }
-
- return m_ulAllocGran;
- }
- void
- _CBufferWinMemMapped::_UnMap()
- {
- if (m_pData)
- {
- UnmapViewOfFile(m_pData);
- m_ulLength = 0;
- }
- }
- HX_RESULT
- _CBufferWinMemMapped::_SetMapping
- (
- HANDLE hfmoFile,
- UINT32 ulOffsetHigh,
- UINT32 ulOffsetLow ,
- UINT32 ulLength
- )
- {
- _UnMap();
-
- if(!ulLength || !hfmoFile)
- {
- return HXR_INVALID_PARAMETER;
- }
- m_ulOffset = ulOffsetLow%_AllocGran();
- if (m_ulOffset < ulOffsetLow)
- {
- ulOffsetLow -= m_ulOffset;
- }
- else
- {
- m_ulOffset = ulOffsetLow;
- ulOffsetLow = 0;
- }
- m_pData = (UCHAR*)MapViewOfFile
- (
- hfmoFile,
- FILE_MAP_READ,
- ulOffsetHigh,
- ulOffsetLow,
- ulLength+m_ulOffset
- );
- if(m_pData)
- {
- m_ulLength = ulLength;
- }
- else
- {
- return HRESULT_FROM_WIN32(::GetLastError());
- }
-
- return HXR_OK;
- }
- /* Create creates a file using the specified mode */
- HX_RESULT CWin32MMFile::Create
- (
- const char *filename,
- UINT16 mode,
- BOOL textflag
- )
- {
- return Open(filename, mode, textflag);
- }
- /* Open will open a file with the specified permissions */
- HX_RESULT CWin32MMFile::Open
- (
- const char *filename,
- UINT16 mode,
- BOOL textflag
- )
- {
- // _O_APPEND Repositions the file pointer to the end of the file
- // before every write operation.
- // _O_CREAT Creates and opens a new file for writing; this has
- // no effect if the file specified by filename exists.
- // _O_EXCL Returns an error value if the file specified by
- // filename exists. Only applies when used with
- // _O_CREAT.
- // _O_RDONLY Opens file for reading only; if this flag is given,
- // neither _O_RDWR nor _O_WRONLY can be given.
- // _O_RDWR Opens file for both reading and writing; if this
- // flag is given, neither _O_RDONLY nor _O_WRONLY can
- // be given.
- // _O_TRUNC Opens and truncates an existing file to zero
- // length; the file must have write permission.
- // The contents of the file are destroyed. If this
- // flag is given, you cannot specify _O_RDONLY.
- // _O_WRONLY Opens file for writing only; if this flag is given,
- // neither _O_RDONLY nor _O_RDWR can be given.
- if(mode&_O_APPEND)// || textflag)
- {
- return HXR_INVALID_PARAMETER;
- }
- Close();
- //CreateFile Parameters
- //
- LPSECURITY_ATTRIBUTES lpSecurityAttributes = NULL;
- DWORD dwCreationDistribution = 0;
- DWORD dwFlagsAndAttributes = 0;
- DWORD dwDesiredAccess = 0;
- DWORD dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
- //CreateFileMapping Parameters
- //
- DWORD flProtect = SEC_COMMIT | SEC_NOCACHE;
- DWORD dwMaximumSizeHigh=0;
- DWORD dwMaximumSizeLow=0;
- if(mode&_O_RDWR || mode&_O_WRONLY)
- {
- dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
- flProtect |= PAGE_READWRITE;
- }
- else
- {
- dwDesiredAccess = GENERIC_READ;
- flProtect |= PAGE_READONLY;
- }
-
- if(mode&_O_EXCL && mode&_O_CREAT)
- {
- dwCreationDistribution |= CREATE_NEW;
- }
- else if(mode&_O_CREAT)
- {
- dwCreationDistribution |= OPEN_ALWAYS;
- }
- else if(mode&_O_TRUNC)
- {
- dwCreationDistribution |= TRUNCATE_EXISTING;
- }
- else
- {
- dwCreationDistribution |= OPEN_EXISTING;
- }
- m_hFile = CreateFile
- (
- OS_STRING(filename),
- dwDesiredAccess,
- dwShareMode,
- lpSecurityAttributes,
- dwCreationDistribution,
- dwFlagsAndAttributes,
- NULL
- );
-
- if(m_hFile == INVALID_HANDLE_VALUE)
- {
- return HRESULT_FROM_WIN32(::GetLastError());
- }
- m_ulSizeLow = GetFileSize(m_hFile, &m_ulSizeHigh);
-
- m_hfmoFile = CreateFileMapping
- (
- m_hFile,
- NULL,
- flProtect,
- dwMaximumSizeHigh,
- dwMaximumSizeLow,
- NULL
- );
- if(!m_hfmoFile)
- {
- return HRESULT_FROM_WIN32(::GetLastError());
- }
- return HXR_OK;
- }
- /* Close closes a file */
- HX_RESULT CWin32MMFile::Close (void)
- {
- if(m_hfmoFile)
- {
- CloseHandle(m_hfmoFile);
- m_hfmoFile = NULL;
- }
- if(m_hFile != INVALID_HANDLE_VALUE)
- {
- CloseHandle(m_hFile);
- m_hFile = INVALID_HANDLE_VALUE;
- }
- m_ulPositionHigh = 0;
- m_ulPositionLow = 0;
- m_ulSizeHigh = 0;
- m_ulSizeLow = 0;
- return HXR_OK;
- }
- /* Seek moves the current file position to the offset from the fromWhere
- specifier */
- HX_RESULT CWin32MMFile::Seek
- (
- ULONG32 offset,
- UINT16 fromWhere
- )
- {
- if(!m_hfmoFile)
- {
- return HXR_FAIL;
- }
- switch(fromWhere)
- {
- case SEEK_SET:
- {
- m_ulPositionHigh = 0;
- m_ulPositionLow = offset;
- }
- break;
- case SEEK_END:
- {
- // Set to End..
- m_ulPositionHigh = m_ulSizeHigh;
- m_ulPositionLow = m_ulSizeLow;
- }
- // Then do the offset..
- case SEEK_CUR:
- {
- m_ulPositionLow += offset;
- // Handle overflow
- //
- if (m_ulPositionLow < offset && offset>1)
- ++m_ulPositionHigh;
- else if (m_ulPositionLow > offset && offset<1)
- --m_ulPositionHigh;
- }
- break;
- };
-
- return HXR_OK;
- }
- /* Tell returns the current file position in the ra file */
- ULONG32 CWin32MMFile::Tell (void)
- {
- if (!m_hfmoFile || m_ulPositionHigh)
- {
- return UINT32(-1);
- }
- return m_ulPositionLow;
- }
- /* Read reads up to count bytes of data into buf.
- returns the number of bytes read, EOF, or -1 if the read failed */
- ULONG32 CWin32MMFile::Read
- (
- char* buf,
- ULONG32 count
- )
- {
- return (ULONG)-1;
- }
- /* Read reads up to ulCount bytes of data into ppbufOut.
- returns a result code */
- HX_RESULT CWin32MMFile::ReadToBuffer
- (
- ULONG32 ulCount,
- IHXBuffer** ppbufOut
- )
- {
- if(!m_hfmoFile)
- {
- return HXR_FAIL;
- }
-
- UINT32 ulActualCount = ulCount;
- if (m_ulPositionHigh >= m_ulSizeHigh)
- {
- if(m_ulPositionLow >= m_ulSizeLow)
- {
- return HXR_FAIL;
- }
- if(m_ulPositionLow+ulCount > m_ulSizeLow)
- {
- ulActualCount = m_ulSizeLow - m_ulPositionLow;
- }
- }
- HX_RESULT pnrRes;
- IHXFragmentedBuffer* pfbufOut;
- IHXBuffer* pbufOut;
- _CBufferWinMemMapped* pmmbufOut;
- IUnknown* punk;
- pmmbufOut = _CBufferWinMemMapped::CreateObject();
- pmmbufOut->AddRef();
- pnrRes = pmmbufOut->_SetMapping
- (
- m_hfmoFile,
- m_ulPositionHigh,
- m_ulPositionLow,
- ulCount
- );
- if (SUCCEEDED(pnrRes))
- {
- pmmbufOut->QueryInterface(IID_IHXBuffer, (void**)&pbufOut);
-
- CHXFragmentedBuffer::CreateInstance(&punk);
- punk->QueryInterface(IID_IHXFragmentedBuffer, (void**)&pfbufOut);
- pfbufOut->Append(pbufOut, 0, ulCount);
- punk->QueryInterface(IID_IHXBuffer, (void**)ppbufOut);
- Seek(ulCount, SEEK_CUR);
- HX_RELEASE(pfbufOut);
- HX_RELEASE(punk);
- HX_RELEASE(pbufOut);
- }
- HX_RELEASE(pmmbufOut);
- return pnrRes;
- }
- /* Write writes up to count bytes of data from buf.
- returns the number of bytes written, or -1 if the write failed */
- ULONG32 CWin32MMFile::Write
- (
- const char *buf,
- ULONG32 count
- )
- {
- return (ULONG)-1;
- }
- /* Rewinds the file to the start of the file */
- HX_RESULT CWin32MMFile::Rewind (void)
- {
- return Seek(0, SEEK_SET);
- }
- /* Return the file descriptor */
- INT16 CWin32MMFile::GetFd (void)
- {
- return 0;
- }
- /* Delete deletes a file */
- HX_RESULT CWin32MMFile::Delete
- (
- const char *filename
- )
- {
- return E_NOTIMPL;
- }