chxdfmem.cpp
上传用户:zhongxx05
上传日期:2007-06-06
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文件大小:5k
- /* ***** 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 ***** */
- #ifdef __MWERKS__
- #pragma once
- #endif
- #include "chxdfmem.h"
- #include "hlxclib/stdio.h" // for SEEK_*
- #if !defined(_VXWORKS) && !defined(_SYMBIAN) && !defined(_OPENWAVE)
- #include <memory.h> // for memcpy
- #endif
- #if defined(_SYMBIAN) || defined(_OPENWAVE)
- # include "hlxclib/string.h" //for memcpy
- #endif
- #ifdef _SOLARIS24
- #include <string.h> // for memcpy
- #endif
- #include "chunkres.h"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- /* Seek moves the current file position to the offset from the fromWhere specifier */
- HX_RESULT CHXDataFileMem::Seek(ULONG32 offset, UINT16 fromWhere)
- {
- switch(fromWhere)
- {
- case SEEK_SET: // Beginning of file
- {
- m_Offset = offset;
- }
- break;
- case SEEK_CUR: // Current position of file pointer
- {
- m_Offset += offset;
- }
- break;
- case SEEK_END: // End of file
- {
- return HXR_FAILED; // Not Supported
- }
- };
- #ifdef DONT_USE_CHUNKYRES /////////////////////////
- if (m_Offset > m_MemSize)
- #else
- if (m_Offset > m_pChunkyRes->GetContiguousLength())
- #endif
- {
- return HXR_BUFFERING;
- }
- return HXR_OK;
- }
- /* Tell returns the current file position in the ra file */
- ULONG32 CHXDataFileMem::Tell()
- {
- return m_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 CHXDataFileMem::Read(char* buf, ULONG32 count)
- {
- ULONG32 actual = count;
- #ifdef DONT_USE_CHUNKYRES /////////////////////////
- // If the offset is greater than we've seeked to, then
- // we can just ignore things....
- if (m_Offset > m_MemSize)
- {
- return 0;
- }
- // If the current offset plus the requested number of bytes
- // is more than we've read, then we will reduce the actual
- // count to what we have available.
- if (m_Offset + actual > m_MemSize)
- {
- actual = m_MemSize-m_Offset;
- }
- if (actual > 0)
- {
- memcpy(buf,m_pMemData+m_Offset,actual); /* Flawfinder: ignore */
- m_Offset += actual;
- }
- else
- {
- actual = (ULONG32)-1;
- }
- return actual;
- #else
- if (!m_pChunkyRes)
- {
- return 0;
- }
- if (m_Offset > m_pChunkyRes->GetContiguousLength())
- {
- return 0;
- }
- // If the current offset plus the requested number of bytes
- // is more than we've read, then we will reduce the actual
- // count to what we have available.
- if (m_Offset + actual > m_pChunkyRes->GetContiguousLength())
- {
- actual = m_pChunkyRes->GetContiguousLength()-m_Offset;
- }
- if (actual > 0)
- {
- HX_RESULT tempErr = m_pChunkyRes->GetData(m_Offset,buf,actual,&actual);
- if (tempErr != HXR_OK)
- {
- mLastError = tempErr;
- actual = (ULONG32)-1;
- }
- else
- {
- m_Offset += actual;
- }
- }
- else
- {
- actual = (ULONG32)-1;
- }
- return actual;
- #endif
- }
- /* Rewinds the file to the start of the file */
- HX_RESULT CHXDataFileMem::Rewind()
- {
- m_Offset = 0;
- return HXR_OK;
- }