cwin32file.cpp
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上传日期:2007-06-06
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文件大小:11k
- /* ***** 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 "platform/win/cwin32file.h"
- #include "hlxclib/fcntl.h"
- #include "hlxclib/windows.h"
- #include "hxassert.h"
- #define HX_FILE_NOT_OPEN -1000
- // CHXFile should set the file reference to a value
- // indicating the file is not open
- CWin32File::CWin32File (void) :
- mFD(INVALID_HANDLE_VALUE)
- {
- mLastError = HXR_OK;
- }
- // ~CHXFile should close the file if it is open
- CWin32File::~CWin32File(void)
- {
- // close the file if it is open
- if ( mFD != INVALID_HANDLE_VALUE )
- Close();
- }
- // 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 CWin32File::Create(const char *filename, UINT16 mode, BOOL textflag)
- {
- // close previous file if necessary
- if ( mFD != INVALID_HANDLE_VALUE )
- Close();
- DWORD acc = GENERIC_WRITE, shared = 0, disp = 0;
-
- if (mode & O_CREAT)
- {
- acc |= GENERIC_WRITE;
- if (mode & O_EXCL)
- disp |= CREATE_NEW;
- else
- disp |= OPEN_ALWAYS;
- }
- if (mode & O_TRUNC)
- {
- acc |= GENERIC_WRITE;
- disp = TRUNCATE_EXISTING | CREATE_ALWAYS;
- }
- if (mode & O_RDONLY)
- acc = GENERIC_READ;
- if (mode & O_RDWR)
- acc = GENERIC_READ | GENERIC_WRITE;
- if (mode & O_WRONLY)
- acc = GENERIC_WRITE;
- // create file
- mLastError = HXR_OK;
- if ( ( mFD = CreateFile( OS_STRING(filename),
- acc, shared, NULL,
- disp, NULL, NULL)) == INVALID_HANDLE_VALUE )
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- if (mode & O_APPEND)
- Seek(0, SEEK_END);
- 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 CWin32File::Open(const char *filename, UINT16 mode, BOOL textflag)
- {
-
- // close previous file if necessary
- if ( mFD != INVALID_HANDLE_VALUE )
- Close();
- // open file
- mLastError = HXR_OK;
- DWORD acc = GENERIC_WRITE, disp = OPEN_ALWAYS;
- if (mode & O_CREAT)
- {
- acc |= GENERIC_WRITE;
- if (mode & O_EXCL)
- disp = CREATE_NEW;
- else
- disp = OPEN_ALWAYS;
- }
- if (mode & O_TRUNC)
- {
- acc |= GENERIC_WRITE;
- disp = TRUNCATE_EXISTING | CREATE_ALWAYS;
- }
- if (mode & O_RDONLY)
- acc = GENERIC_READ;
- if (mode & O_RDWR)
- acc = GENERIC_READ | GENERIC_WRITE;
- if (mode & O_WRONLY)
- acc = GENERIC_WRITE;
- if(mode & O_TRUNC)
- {
- acc |= GENERIC_WRITE;
- mFD = CreateFile(OS_STRING(filename), acc, 0,
- NULL, 0, NULL, NULL) ;
- if ( mFD == INVALID_HANDLE_VALUE)
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- Close();
- }
- // Actually open the file
- mFD = CreateFile(OS_STRING(filename), acc, 0, NULL, disp, NULL, NULL) ;
- if ( mFD == INVALID_HANDLE_VALUE )
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- if (mode & O_APPEND)
- Seek(0, SEEK_END);
- 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 CWin32File::OpenShared(const char *filename, UINT16 mode, UINT16 sharedmode, BOOL textflag)
- {
-
- // close previous file if necessary
- if ( mFD != INVALID_HANDLE_VALUE )
- Close();
- // open file
- mLastError = HXR_OK;
- DWORD acc = GENERIC_WRITE, disp = 0, shared = FILE_SHARE_READ | FILE_SHARE_WRITE;
- if (mode & O_CREAT)
- {
- acc |= GENERIC_WRITE;
- if (mode & O_EXCL)
- disp |= CREATE_NEW;
- else
- disp |= OPEN_ALWAYS;
- }
- if (mode & O_TRUNC)
- {
- acc |= GENERIC_WRITE;
- disp = TRUNCATE_EXISTING | CREATE_ALWAYS;
- }
- if (mode & O_RDONLY)
- acc = GENERIC_READ;
- if (mode & O_RDWR)
- acc = GENERIC_READ | GENERIC_WRITE;
- if (mode & O_WRONLY)
- acc = GENERIC_WRITE;
- if (sharedmode & SH_DENYRW)
- shared = 0;
- if (sharedmode & SH_DENYWR)
- shared = FILE_SHARE_READ;
- if (sharedmode & SH_DENYRD)
- shared = FILE_SHARE_WRITE;
- if(mode & O_TRUNC)
- {
- mFD = CreateFile(OS_STRING(filename), acc, 0,
- NULL, 0, NULL, NULL) ;
- // Check acces rights to this file first
- if ( mFD == INVALID_HANDLE_VALUE)
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- Close();
- }
- // Actually open the file - use sharing mode
- mFD = CreateFile(OS_STRING(filename), acc, shared,
- NULL, 0, NULL, NULL) ;
- if ( mFD == INVALID_HANDLE_VALUE )
- {
- mLastError = HXR_DOC_MISSING;
- return HXR_DOC_MISSING;
- }
- return HXR_OK;
- }
- // Close the previous file if it was open
- // returns HXR_OK or HXR_INVALID_FILE if an error occurred
- HX_RESULT CWin32File::Close(void)
- {
- // close previous file if necessary
- if ( mFD != INVALID_HANDLE_VALUE)
- {
- mLastError = HXR_OK;
- if ( CloseHandle( 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 CWin32File::GetSize(void)
- {
- ULONG32 ret = 0;
- if (mFD != INVALID_HANDLE_VALUE)
- {
- ret = GetFileSize(mFD, NULL);
- }
- return ret;
- }
- // 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 CWin32File::Seek(ULONG32 offset, UINT16 fromWhere)
- {
- mLastError = HXR_INVALID_FILE;
- if (( mFD != INVALID_HANDLE_VALUE ) &&
- ( SetFilePointer( mFD, offset, NULL, fromWhere ) != 0xffffffff ))
- mLastError = HXR_OK;
- return mLastError;
- }
- // Rewind sets the file position to the start of file
- // returns HXR_OK or HXR_INVALID_FILE if an error occurred
- HX_RESULT CWin32File::Rewind(void)
- {
- mLastError = HXR_INVALID_FILE;
- if (( mFD != INVALID_HANDLE_VALUE ) &&
- ( SetFilePointer( mFD, 0, NULL, FILE_BEGIN ) != 0xffffffff ))
- mLastError = HXR_OK;
- return mLastError;
- }
- // Tell returns the current file position
- // returns HXR_OK or -1 if an error occurred
- ULONG32 CWin32File::Tell(void)
- {
- long offset = -1;
- mLastError = HXR_INVALID_FILE;
- if (( mFD != INVALID_HANDLE_VALUE ) &&
- ((offset = SetFilePointer( mFD, 0, NULL,
- FILE_CURRENT )) != 0xffffffff ))
- mLastError = HXR_OK;
- 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 CWin32File::Read (char *buf, ULONG32 count)
- {
- DWORD ncnt = (DWORD)-1; // number of bytes read
- if ( mFD != INVALID_HANDLE_VALUE )
- {
- mLastError = HXR_OK;
- ULONG32 tmpCheck = Tell();
- HX_ASSERT(count < UINT_MAX);
- if ( ( ReadFile( mFD, (LPVOID)buf, (DWORD) count, &ncnt, NULL ) ) == 0 )
- {
- 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 CWin32File::Write(const char *buf, ULONG32 count)
- {
- DWORD ncnt = (DWORD)-1; // number of bytes written
- if ( mFD != INVALID_HANDLE_VALUE )
- {
- mLastError = HXR_OK;
- HX_ASSERT(count < UINT_MAX);
- if ( ( WriteFile( mFD, (LPVOID)buf, (DWORD) count, &ncnt, NULL ) ) == -1 )
- {
- mLastError = HXR_INVALID_FILE;
- }
- }
- return (ULONG32)ncnt;
- }
- BOOL CWin32File::GetTemporaryFileName(const char *tag, char* name, UINT32 ulBufLen)
- {
- BOOL bOk = TRUE;
- char szTempPathName[_MAX_PATH] = "."; /* Flawfinder: ignore */
- #if !defined(WIN32_PLATFORM_PSPC)
- if (!GetTempPath(_MAX_PATH,szTempPathName))
- {
- bOk = FALSE;
- }
- #endif /* !defined(WIN32_PLATFORM_PSPC) */
- if (bOk && !GetTempFileName(OS_STRING(szTempPathName),
- OS_STRING(tag),0, OS_STRING2(name,_MAX_PATH)))
- {
- bOk = FALSE;
- }
- return bOk;
- }
- // Delete a file
- HX_RESULT CWin32File::Delete(const char *filename)
- {
- // close previous file if necessary
- if ( mFD != INVALID_HANDLE_VALUE )
- {
- Close();
- }
- // delete file
- mLastError = HXR_OK;
- if(!DeleteFile(OS_STRING(filename)))
- {
- if(GetLastError() == ERROR_ACCESS_DENIED)
- mLastError = HXR_ACCESSDENIED;
- else
- mLastError = HXR_DOC_MISSING;
- return mLastError;
- }
- return HXR_OK;
- }
- HX_RESULT CWin32File::ChangeSize (ULONG32 newSize)
- {
- HX_RESULT res = HXR_FAIL;
- if (mFD != INVALID_HANDLE_VALUE)
- {
- ULONG32 pos = Tell();
- if (SetFilePointer(mFD, newSize, 0, SEEK_SET) != 0xFFFFFFFF)
- {
- if (SetEndOfFile(mFD) != 0)
- res = HXR_OK;
- // reposition pointer at orignal position
- Seek(pos, SEEK_SET);
- }
- }
- return res;
- }