hxsbuffer.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 ***** */
- /*
- * In order to support the IHXBuffer interface, we must cast away the const
- * qualifier on our m_pData in the Get() and GetBuffer() functions. If you
- * can think of a better way, please let me know ... TDM
- */
- #include "hxtypes.h"
- #include "hxcom.h"
- #include "hxresult.h"
- #include "ihxpckts.h"
- #include "chxpckts.h"
- #include "hxsbuffer.h"
- //#include "rtsputil.h"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static char HX_THIS_FILE[] = __FILE__;
- #endif
- CHXStaticBuffer::CHXStaticBuffer(void) :
- m_ulRefCount(0),
- m_pbufRef(NULL),
- m_pData(NULL),
- m_ulLength(0)
- {
- // Empty
- }
- CHXStaticBuffer::CHXStaticBuffer(UCHAR* pData, UINT32 ulLength) :
- m_ulRefCount(0),
- m_pbufRef(NULL),
- m_pData(pData),
- m_ulLength(ulLength)
- {
- // Empty
- }
- CHXStaticBuffer::CHXStaticBuffer(IHXBuffer* pbuf, UINT32 pos, UINT32 len) :
- m_ulRefCount(0),
- m_pbufRef(pbuf),
- m_pData(pbuf->GetBuffer()+pos),
- m_ulLength(len)
- {
- HX_ASSERT(pos+len <= pbuf->GetSize());
- pbuf->AddRef();
- }
- CHXStaticBuffer::~CHXStaticBuffer(void)
- {
- HX_RELEASE(m_pbufRef);
- }
- /*** IUnknown methods ***/
- STDMETHODIMP
- CHXStaticBuffer::QueryInterface(REFIID riid, void** ppvObj)
- {
- if (IsEqualIID(riid, IID_IUnknown))
- {
- AddRef();
- *ppvObj = this;
- return HXR_OK;
- }
- else if (IsEqualIID(riid, IID_IHXBuffer))
- {
- AddRef();
- *ppvObj = (IHXBuffer*)this;
- return HXR_OK;
- }
- *ppvObj = NULL;
- return HXR_NOINTERFACE;
- }
- STDMETHODIMP_(ULONG32)
- CHXStaticBuffer::AddRef(void)
- {
- return InterlockedIncrement(&m_ulRefCount);
- }
- STDMETHODIMP_(ULONG32)
- CHXStaticBuffer::Release(void)
- {
- HX_ASSERT(m_ulRefCount > 0);
- if (InterlockedDecrement(&m_ulRefCount) > 0)
- {
- return m_ulRefCount;
- }
- delete this;
- return 0;
- }
- /*** IHXBuffer methods ***/
- STDMETHODIMP
- CHXStaticBuffer::Get(REF(UCHAR*) pData, REF(ULONG32) ulLength)
- {
- pData = (UCHAR*)m_pData; //XXX: how to avoid discarding const?
- ulLength = m_ulLength;
- return HXR_OK;
- }
- STDMETHODIMP
- CHXStaticBuffer::Set(const UCHAR* pData, ULONG32 ulLength)
- {
- // We allow changing the packet info when it is owned by atmost one user.
- if (m_ulRefCount > 1)
- {
- return HXR_UNEXPECTED;
- }
- if (m_pbufRef != NULL)
- {
- // New bounds must remain within the referenced buffer
- if (pData < m_pbufRef->GetBuffer() || pData + ulLength > m_pbufRef->GetBuffer() + m_pbufRef->GetSize())
- {
- return HXR_UNEXPECTED;
- }
- }
- m_pData = pData;
- m_ulLength = ulLength;
- return HXR_OK;
- }
- STDMETHODIMP
- CHXStaticBuffer::SetSize(ULONG32 ulLength)
- {
- // We allow changing the packet info when it is owned by atmost one user.
- if (m_ulRefCount > 1)
- {
- return HXR_UNEXPECTED;
- }
- if (m_pbufRef != NULL)
- {
- // New bounds must remain within the referenced buffer
- if (m_pData + ulLength > m_pbufRef->GetBuffer() + m_pbufRef->GetSize())
- {
- return HXR_UNEXPECTED;
- }
- }
- m_ulLength = ulLength;
- return HXR_OK;
- }
- STDMETHODIMP_(ULONG32)
- CHXStaticBuffer::GetSize(void)
- {
- return m_ulLength;
- }
- STDMETHODIMP_(UCHAR*)
- CHXStaticBuffer::GetBuffer(void)
- {
- return (UCHAR*)m_pData; //XXX: how to avoid discarding const?
- }