pkthndlr.cpp
上传用户:dangjiwu
上传日期:2013-07-19
资源大小:42019k
文件大小:7k
- /* ***** BEGIN LICENSE BLOCK *****
- * Source last modified: $Id: pkthndlr.cpp,v 1.4.20.1 2004/07/09 02:04:33 hubbe Exp $
- *
- * Portions Copyright (c) 1995-2004 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 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the current version of the RealNetworks Community
- * Source License (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.
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL") in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your version of
- * this file only under the terms of the GPL, and not to allow others
- * to use your version of this file under the terms of either the RPSL
- * or RCSL, indicate your decision by deleting the provisions above
- * and replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient may
- * use your version of this file under the terms of any one of the
- * RPSL, the RCSL or the GPL.
- *
- * 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 "hxtypes.h"
- #include "hxresult.h"
- #include "hxcom.h"
- #include "hlxclib/string.h"
- #include "ihxpckts.h"
- #include "hxassert.h"
- #include "rtpwrap.h"
- #include "pkthndlr.h"
- RTCPPacker::RTCPPacker()
- : m_pReport(NULL)
- , m_pSDES(NULL)
- , m_pBYE(NULL)
- , m_pAPP(NULL)
- {
- }
- HX_RESULT
- RTCPPacker::Set(RTCPPacket* pPkt)
- {
- HX_ASSERT(pPkt);
- switch(pPkt->packet_type)
- {
- case RTCP_SR:
- HX_ASSERT(!m_pReport);
- m_pReport = pPkt;
- break;
- case RTCP_RR:
- HX_ASSERT(!m_pReport);
- m_pReport = pPkt;
- break;
- case RTCP_SDES:
- m_pSDES = pPkt;
- break;
- case RTCP_BYE:
- m_pBYE = pPkt;
- break;
- case RTCP_APP:
- m_pAPP = pPkt;
- break;
- default:
- HX_ASSERT(!"RTCPPacker::Set(): Don't know this packet type");
- return HXR_FAIL;
- }
- return HXR_OK;
- }
- void
- RTCPPacker::PackOne(RTCPPacket* pPkt, REF(UCHAR*) pc, REF(UINT32) ulPackedLen)
- {
- HX_ASSERT(pPkt && pc);
- pc = pPkt->pack(pc, ulPackedLen);
- }
- /*
- * SR or RR must have been set
- * SDES must have been set
- */
- HX_RESULT
- RTCPPacker::Pack(REF(IHXBuffer*) pBuf)
- {
- HX_ASSERT(m_pReport);
- HX_ASSERT(m_pSDES);
- HX_ASSERT(pBuf); // needs to be an object
- UINT32 ulBufSize = (m_pReport->length + 1) * 4;
- ulBufSize += (m_pSDES->length + 1) * 4;
- if (m_pBYE)
- {
- ulBufSize += (m_pBYE->length + 1) * 4;
- }
- if (m_pAPP)
- {
- ulBufSize += (m_pAPP->length + 1) * 4;
- }
- // now pack!
- pBuf->SetSize(ulBufSize);
- UCHAR* pc = pBuf->GetBuffer();
- UINT32 ulPackedLen = 0;
- PackOne(m_pReport, pc, ulPackedLen);
- HX_ASSERT((((UINT32)m_pReport->length + 1) * 4) == ulPackedLen);
- PackOne(m_pSDES, pc, ulPackedLen);
- HX_ASSERT((((UINT32)m_pSDES->length + 1) * 4) == ulPackedLen);
- if (m_pAPP)
- {
- PackOne(m_pAPP, pc, ulPackedLen);
- HX_ASSERT((((UINT32)m_pAPP->length + 1) * 4) == ulPackedLen);
- }
- /* BYE pkt needs to be the last pkt! */
- if (m_pBYE)
- {
- PackOne(m_pBYE, pc, ulPackedLen);
- HX_ASSERT((((UINT32)m_pBYE->length + 1) * 4) == ulPackedLen);
- }
- return HXR_OK;
- }
- RTCPUnPacker::RTCPUnPacker()
- {
- /* nothing to do */
- }
- /*
- * if there are left over pkts in the list, delete them.
- */
- RTCPUnPacker::~RTCPUnPacker()
- {
- if (!m_PktList.IsEmpty())
- {
- CHXSimpleList::Iterator i;
- for (i = m_PktList.Begin(); i != m_PktList.End(); ++i)
- {
- delete (RTCPPacket*)(*i);
- }
- }
- HX_ASSERT(m_PktList.IsEmpty());
- }
- /*
- * Get a pkt in the head of the list. Caller is responsible of deleting it
- */
- HX_RESULT
- RTCPUnPacker::Get(REF(RTCPPacket*) pPkt)
- {
- if (m_PktList.IsEmpty())
- {
- return HXR_FAIL;
- }
- pPkt = (RTCPPacket*)m_PktList.RemoveHead();
- HX_ASSERT(pPkt);
- return HXR_OK;
- }
- /*
- * RTCPPacket will be created for each pkt in this compound pkt.
- * Caller is responsible of freeing them
- */
- HX_RESULT
- RTCPUnPacker::UnPack(IHXBuffer* pCompound)
- {
- if (HXR_OK != Validate(pCompound))
- {
- return HXR_FAIL;
- }
-
- BYTE* pFirst = pCompound->GetBuffer();
- BYTE* pNext = pFirst;
- RTCPPacket* pPkt = NULL;
-
- while (pNext && pNext < (pFirst + pCompound->GetSize()))
- {
- pPkt = new RTCPPacket();
-
- pNext = pPkt->unpack(pNext, (pFirst + pCompound->GetSize()) - pNext);
- m_PktList.AddTail(pPkt);
- }
- return HXR_OK;
- }
- /*
- * Copied from the RFC with a feeling...
- */
- HX_RESULT
- RTCPUnPacker::Validate(IHXBuffer* pCompound)
- {
- HX_ASSERT(pCompound);
-
- UINT32 ulLen = pCompound->GetSize();
- BYTE* pc = pCompound->GetBuffer();
- BYTE* end = pc + ulLen;
- BYTE* pcTemp;
- UINT16 unPktLen = 0;
- UINT8 uchVer = 0;
- do
- {
- pcTemp = pc;
- uchVer = (*pcTemp++ & 0xc0) >> 6;
- *pcTemp++; // this is type
- unPktLen = *pcTemp++ << 8;
- unPktLen |= *pcTemp++;
- pc = (pc + ((unPktLen + 1) * 4));
- } while (pc < end && 2 == uchVer);
-
- if (pc != end)
- {
- /* something is wrong */
- HX_ASSERT(!"RTCPUnPacker::Validate() failed");
- return HXR_FAIL;
- }
- return HXR_OK;
- }