chxdataf_stdio.cpp
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上传日期:2007-06-06
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文件大小:7k
- /* ***** 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_stdio.h"
- #include "hxassert.h" // hxassert.h is NOT a system header
- #include "hxheap.h"
- #include "hxbuffer.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- // ~CHXFile should close the file if it is open
- CHXDataFile::~CHXDataFile(void)
- {
- Close();
- }
- BOOL CHXDataFile::GetTemporaryFileName(const char *tag, char* name, UINT32 ulBufLen)
- {
- return FALSE;
- }
- CHXDataFile*
- CHXDataFile::Construct(UINT32 ulFlags, IUnknown** ppCommonObj)
- {
- CHXDataFile* pCHXDataFile = new CHXDataFile();
- return pCHXDataFile;
- }
- //
- // translate mode flag defined in (hlxclibfcntl.h) to fopen flag
- //
- // buf must be at least CCH_MAX_FOPENFLAG chars
- //
- static const UINT32 CCH_MAX_FOPENFLAG = 4;
- static const char* TranslateOpenMode(UINT16 mode, bool bText, char* buf)
- {
- buf[0] = ' ';
- HX_ASSERT(!(mode & O_EXCL));
- // Most mode flags are OR'able values. However, O_RDONLY is defined 0
- // so we can't check val & O_RDONLY. To address this we treat the lowest
- // two bits as a mutually exclusive value indicating ro, wo, rw.
- UINT32 openType = mode & 0x03;
- // if truncate not specified explicitly we open for appending
- if( !(mode & O_TRUNC) && O_RDONLY != openType )
- {
- mode |= O_APPEND;
- }
- const char* pszAppend = 0;
- if (O_RDWR == openType)
- {
- if(mode & O_APPEND)
- {
- // read and writing/append; creates file if it doesn't exist
- pszAppend = "a+";
- }
- else
- {
- if(mode & O_CREAT)
- {
- // read/write; creates file if it doesn't
- // exist; if file exists contents are destroyed
- pszAppend = "w+";
- }
- else
- {
- // read/write; file must exist
- pszAppend = "r+";
- }
- }
- }
- else if (O_WRONLY == openType)
- {
- if(mode & O_APPEND)
- {
- // write/append; creates file if it doesn't exist
- pszAppend = "a";
- }
- else
- {
- if(mode & O_CREAT)
- {
- // write only; if file exists contents are destroyed
- pszAppend = "w";
- }
- else
- {
- // reading and writing (closest we can do); file must exist
- pszAppend = "r+";
- }
- }
- }
- else if (O_RDONLY == openType)
- {
- // read only; file must exist
- pszAppend = "r";
- HX_ASSERT(!(mode & O_CREAT));
- }
-
- HX_ASSERT(pszAppend);
-
- if( pszAppend )
- {
- strcpy(buf, pszAppend);
- if ((mode & O_BINARY) && !bText)
- {
- pszAppend = "b";
- }
- else
- {
- pszAppend = "t";
- }
- strcat(buf,pszAppend);
- }
- return buf;
- }
- /* Create creates a file using the specified fcntl.h mode */
- HX_RESULT
- CHXDataFile::Create(const char *filename, UINT16 mode, BOOL textFlag)
- {
- mode |= O_CREAT;
- return Open(filename, mode, textFlag);
- }
- /* Open will open a file with the specified fcntl.h permissions */
- HX_RESULT
- CHXDataFile::Open(const char *filename, UINT16 mode, BOOL textFlag)
- {
- HX_RESULT theErr = HXR_FAIL;
-
- char fopenFlags[CCH_MAX_FOPENFLAG];
-
- if( TranslateOpenMode(mode, textFlag, fopenFlags) )
- {
- m_FP = fopen( filename, fopenFlags );
- if(m_FP)
- {
- theErr = HXR_OK;
- }
- }
- return theErr;
- }
- /* Close closes a file */
- HX_RESULT
- CHXDataFile::Close(void)
- {
- if(!m_FP)
- {
- return HXR_FAIL;
- }
- fclose(m_FP);
- m_FP = NULL;
- return HXR_OK;
- }
- /* Seek moves the current file position to the offset from the fromWhere specifier */
- HX_RESULT
- CHXDataFile::Seek(ULONG32 offset, UINT16 fromWhere)
- {
- if(!m_FP)
- {
- return HXR_FAIL;
- }
- fseek( m_FP, offset, fromWhere );
- return HXR_OK;
- }
- /* Tell returns the current file position in the ra file */
- ULONG32
- CHXDataFile::Tell(void)
- {
- if(!m_FP)
- {
- return 0;
- }
- return ftell( m_FP );
- }
- /* Read reads up to count bytes of data into buf.
- returns the number of bytes read, EOF, or -1 if the read failed */
- ULONG32
- CHXDataFile::Read(char* buf, ULONG32 count)
- {
- if(!m_FP)
- {
- return 0;
- }
- return fread( buf, 1, count, m_FP );
- }
- /* Write writes up to count bytes of data from buf.
- returns the number of bytes written, or -1 if the write failed */
- ULONG32
- CHXDataFile::Write(const char *buf, ULONG32 count)
- {
- if(!m_FP)
- {
- return 0;
- }
- ULONG32 numWritten = fwrite( (void*) buf, 1, count, m_FP );
- return numWritten;
- }
- /* Rewinds the file to the start of the file */
- HX_RESULT
- CHXDataFile::Rewind(void)
- {
- if(!m_FP)
- {
- return HXR_FAIL;
- }
- fseek( m_FP, 0, SEEK_SET );
- return HXR_OK;
- }
- /* Delete deletes a file */
- HX_RESULT
- CHXDataFile::Delete(const char *filename)
- {
- if(!filename)
- {
- return HXR_FAIL;
- }
- unlink(filename);
- return HXR_OK;
- }