cwinfile.cpp
上传用户:zhongxx05
上传日期:2007-06-06
资源大小:33641k
文件大小:9k
- /* ***** 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 <stdio.h>
- #include <io.h>
- #include <fcntl.h>
- #include <sys/stat.h>
- #include <errno.h>
- #include <share.h>
- #include <limits.h>
- #include "hxassert.h"
- #include "CHXDataF.h"
- #include "platform/win/CWinFile.h"
- #include <windows.h> // For GetTempPath(), etc.
- #include <stdlib.h> // For _MAX_PATH
- #include "hxcom.h"
- #include "hxbuffer.h"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- #define HX_FILE_NOT_OPEN -1000
- // CHXFile should set the file reference to a value
- // indicating the file is not open
- CWinFile::CWinFile (void)
- {
- // set FD to indicate file is not open
- mFD = HX_FILE_NOT_OPEN;
- mLastError = HXR_OK;
- }
- // ~CHXFile should close the file if it is open
- CWinFile::~CWinFile(void)
- {
- // close the file if it is open
- if ( mFD >= 0 )
- {
- close( mFD );
- }
- }
- // Create a file with the specified mode
- // Closes the previous file if it was open
- // returns HXR_OK or HXR_INVALID_FILE if an error occurred
- HX_RESULT CWinFile::Create(const char *filename, UINT16 mode, BOOL textflag)
- {
- // close previous file if necessary
- if ( mFD >= 0 )
- {
- close( mFD );
- }
- // create file
- mLastError = HXR_OK;
- if ( ( mFD = creat( filename, mode ) ) < 0 )
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- return HXR_OK;
- }
- // Open a file with the specified mode
- // Closes the previous file if it was open
- // returns HXR_OK or HXR_INVALID_FILE if an error occurred
- HX_RESULT CWinFile::Open(const char *filename, UINT16 mode, BOOL textflag)
- {
-
- // close previous file if necessary
- if ( mFD >= 0 )
- {
- close( mFD );
- }
- // open file
- mLastError = HXR_OK;
- int shareFlag = SH_DENYNO;
- if(mode & O_TRUNC)
- {
- // Check acces rights to this file first
- if (!textflag)
- mFD = sopen( filename, mode | O_BINARY, SH_DENYRW, S_IREAD | S_IWRITE );
- else
- mFD = sopen( filename, mode | O_TEXT, SH_DENYRW, S_IREAD | S_IWRITE );
- if ( mFD < 0)
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- close( mFD );
- }
- // Actually open the file
- if (!textflag)
- mFD = open( filename, mode | O_BINARY, S_IREAD | S_IWRITE );
- else
- mFD = open( filename, mode | O_TEXT, S_IREAD | S_IWRITE );
- if ( mFD < 0 )
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- return HXR_OK;
- }
- // Open a file for sharing with the specified mode
- // Closes the previous file if it was open
- // returns HXR_OK or HXR_INVALID_FILE if an error occurred
- HX_RESULT CWinFile::OpenShared(const char *filename, UINT16 mode, UINT16 sharedmode, BOOL textflag)
- {
-
- // close previous file if necessary
- if ( mFD >= 0 )
- {
- close( mFD );
- }
- // open file
- mLastError = HXR_OK;
- int shareFlag = SH_DENYNO;
- if(mode & O_TRUNC)
- {
- // Check acces rights to this file first
- if (!textflag)
- mFD = sopen( filename, mode | O_BINARY, SH_DENYRW, S_IREAD | S_IWRITE );
- else
- mFD = sopen( filename, mode | O_TEXT, SH_DENYRW, S_IREAD | S_IWRITE );
- if ( mFD < 0)
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- close( mFD );
- }
- // Actually open the file - use sharing mode
- if (!textflag)
- mFD = sopen( filename, mode | O_BINARY, sharedmode, S_IREAD | S_IWRITE );
- else
- mFD = sopen( filename, mode | O_TEXT, sharedmode, S_IREAD | S_IWRITE );
- if ( mFD < 0 )
- {
- if(errno == EACCES)
- mLastError = HXR_ACCESSDENIED;
- else
- mLastError = HXR_DOC_MISSING;
- return mLastError;
- }
- return HXR_OK;
- }
- // Close the previous file if it was open
- // returns HXR_OK or HXR_INVALID_FILE if an error occurred
- HX_RESULT CWinFile::Close(void)
- {
- // close previous file if necessary
- if ( mFD >= 0 )
- {
- mLastError = HXR_OK;
- if ( close( mFD ) < 0 )
- {
- mLastError = HXR_INVALID_FILE;
- return HXR_INVALID_FILE;
- }
- return HXR_OK;
- }
- return HXR_INVALID_FILE;
- }
- // Simply uses stat to get the size of the file in bytes. If the file
- // is closed, it will still work.
- ULONG32 CWinFile::GetSize(void)
- {
- struct _stat filestats;
- if (mFD >= 0)
- {
- _fstat(mFD, &filestats);
- return filestats.st_size;
- }
- return 0;
- }
- HX_RESULT CWinFile::ChangeSize (ULONG32 newSize)
- {
- if (mFD >= 0)
- {
- // Ff the file pointer is passed the new size, we ought to position it in a valid spot.
- ULONG32 pos = Tell();
- if (pos > newSize)
- Seek(newSize, SEEK_SET);
-
- if (!_chsize(mFD, newSize))
- return HXR_OK;
- else // reposition pointer at orignal position
- Seek(pos, SEEK_SET);
- }
- return HXR_FAIL;
- }
- // Seek moves the current file position to the offset from the fromWhere
- // specifier returns HXR_OK or HXR_INVALID_FILE if an error occurred
- HX_RESULT CWinFile::Seek(ULONG32 offset, UINT16 fromWhere)
- {
- if ( mFD >= 0 )
- {
- mLastError = HXR_OK;
- if ( lseek( mFD, offset, fromWhere ) < 0 )
- {
- mLastError = HXR_INVALID_FILE;
- return HXR_INVALID_FILE;
- }
- return HXR_OK;
- }
- return HXR_INVALID_FILE;
- }
- // Rewind sets the file position to the start of file
- // returns HXR_OK or HXR_INVALID_FILE if an error occurred
- HX_RESULT CWinFile::Rewind(void)
- {
- if ( mFD >= 0 )
- {
- mLastError = HXR_OK;
- if ( lseek( mFD, 0, SEEK_SET ) < 0 )
- {
- mLastError = HXR_INVALID_FILE;
- return HXR_INVALID_FILE;
- }
- return HXR_OK;
- }
- return HXR_INVALID_FILE;
- }
- // Tell returns the current file position
- // returns HXR_OK or -1 if an error occurred
- ULONG32 CWinFile::Tell(void)
- {
- long offset = -1;
- if ( mFD >= 0 )
- {
- mLastError = HXR_OK;
- if ((offset = tell( mFD )) < 0 )
- {
- mLastError = HXR_INVALID_FILE;
- }
- }
- return (ULONG32)offset;
- }
- /* Read reads up to count bytes of data into buf.
- returns the number of bytes read, EOF, or -1 if the read failed */
- ULONG32 CWinFile::Read (char *buf, ULONG32 count)
- {
- UINT ncnt = (UINT)-1; // number of bytes read
- if ( mFD >= 0 )
- {
- mLastError = HXR_OK;
- ULONG32 tmpCheck = Tell();
- HX_ASSERT(count < UINT_MAX);
- if ( ( ncnt = read( mFD, buf, (UINT) count ) ) == -1 )
- {
- mLastError = HXR_INVALID_FILE;
-
- }
- }
- return (ULONG32)ncnt;
- }
- /* Write writes up to count bytes of data from buf.
- returns the number of bytes written, or -1 if the write failed */
- ULONG32 CWinFile::Write(const char *buf, ULONG32 count)
- {
- UINT ncnt = (UINT)-1; // number of bytes written
- if ( mFD >= 0 )
- {
- mLastError = HXR_OK;
- HX_ASSERT(count < UINT_MAX);
- if ( ( ncnt = write( mFD, buf, (UINT)count ) ) == -1 )
- {
- mLastError = HXR_INVALID_FILE;
- }
- }
- return (ULONG32)ncnt;
- }
- BOOL CWinFile::GetTemporaryFileName(const char *tag, char* name, UINT32 ulBufLen)
- {
- BOOL bOk = FALSE;
- #ifdef _WIN32
- char szTempPathName[_MAX_PATH]; /* Flawfinder: ignore */
- if (!GetTempPath(_MAX_PATH,szTempPathName))
- {
- goto exit;
- }
- if (!GetTempFileName(szTempPathName,tag,0,name))
- {
- goto exit;
- }
- #else
- if (!GetTempFileName(0,tag,0,name))
- {
- goto exit;
- }
- #endif _WIN32
- // If we made it this far then we're cool!
- bOk = TRUE;
- exit:
- return bOk;
- }
- // Delete a file
- HX_RESULT CWinFile::Delete(const char *filename)
- {
- // close previous file if necessary
- if ( mFD >= 0 )
- {
- close( mFD );
- }
- // delete file
- mLastError = HXR_OK;
- if(unlink(filename))
- {
- if(errno == EACCES)
- mLastError = HXR_ACCESSDENIED;
- else
- mLastError = HXR_DOC_MISSING;
- return mLastError;
- }
- return HXR_OK;
- }