chxdataf.cpp
上传用户:zhongxx05
上传日期:2007-06-06
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文件大小:4k
- /* ***** 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 "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
- #define MAX_UNCHECKED_READ_LENGTH 4096
- // CHXFile should set the file reference to a value
- // indicating the file is not open
- CHXDataFile::CHXDataFile (void)
- {
- mLastError = 0;
- }
- // ~CHXFile should close the file if it is open
- CHXDataFile::~CHXDataFile(void)
- {
- // override
- }
- BOOL CHXDataFile::GetTemporaryFileName(const char *tag, char* name, UINT32 ulBufLen)
- {
- return FALSE;
- }
- HX_RESULT CHXDataFile::ReadToBuffer(ULONG32 ulCount, IHXBuffer** ppbufOut)
- {
- HX_RESULT hr = HXR_FAILED;
- UINT32 size = 0;
- UINT32 filesize = 0;
- UINT32 sizeRead = 0;
- CHXBuffer* buffer = NULL;
- // Initialize...
- *ppbufOut = NULL;
- // The size to be copied...
- size = (LONG32) ulCount;
-
- if (size > MAX_UNCHECKED_READ_LENGTH)
- {
- // Get the size of the file...
- filesize = (LONG32) GetSize();
-
- // Create the buffer of the appropriate size...
- if (size > filesize)
- {
- size = filesize;
- }
- }
-
- // Create the buffer...
- buffer = new CHXBuffer;
- if (buffer)
- {
- buffer->AddRef();
- hr = buffer->SetSize(size);
- if (hr == HXR_OK)
- {
- sizeRead = 0;
- sizeRead = Read((char*) buffer->GetBuffer(), size);
- if (sizeRead == size)
- {
- *ppbufOut = buffer;
- buffer = NULL;
- }
- else
- {
- if (sizeRead > size)
- {
- hr = HXR_INVALID_FILE;
- }
- else
- {
- hr = HXR_FAIL;
- if (sizeRead != 0)
- {
- hr = buffer->SetSize(sizeRead);
- if (hr == HXR_OK)
- {
- *ppbufOut = buffer;
- buffer = NULL;
- }
- }
- }
- }
- }
- }
-
- HX_RELEASE(buffer);
- return hr;
- }