compression.cxx

一个著名的SIP协议栈

#include "rutil/Logger.hxx"
#include "rutil/Random.hxx"
#include "resip/stack/Compression.hxx"

#ifdef USE_SIGCOMP
#include <osc/StateHandler.h>
#include <osc/Stack.h>
#include <osc/DeflateCompressor.h>
#endif

#define RESIPROCATE_SUBSYSTEM Subsystem::SIP

resip::Compression resip::Compression::Disabled(resip::Compression::NONE);

resip::Compression::Compression(resip::Compression::Algorithm algorithm,
                                int stateMemorySize,
                                int cyclesPerBit,
                                int decompressionMemorySize,
                                Data sigcompId)
  : mAlgorithm(algorithm), mStateHandler(0), mSigcompId(sigcompId)
{
#ifdef USE_SIGCOMP
  if (algorithm != NONE)
  {
    mStateHandler = new osc::StateHandler(stateMemorySize,
                                          cyclesPerBit,
                                          decompressionMemorySize);
    mStateHandler->useSipDictionary();

    if (sigcompId == Data::Empty)
    {
      sigcompId = "<";
      sigcompId += Random::getVersion4UuidUrn();
      sigcompId += ">";
    }
  }
  DebugLog (<< "Set SigcompId to " << sigcompId);
#else
  mAlgorithm = NONE;
  DebugLog (<< "COMPRESSION SUPPORT NOT COMPILED IN");
#endif
  DebugLog (<< "Compression configuration object created; algorithm = "
            << static_cast<int>(mAlgorithm) );
}

resip::Compression::~Compression()
{
#ifdef USE_SIGCOMP
  delete mStateHandler;
#endif
}

void
resip::Compression::addCompressorsToStack(osc::Stack *stack)
{
#ifdef USE_SIGCOMP
  switch(getAlgorithm())
  {
    case DEFLATE:
      DebugLog (<< "Adding Deflate Compressor");
      stack->addCompressor(new osc::DeflateCompressor(getStateHandler()));
      break;

    default:
      WarningLog (<< "Invalid compressor specified! Using deflate Compressor");
      stack->addCompressor(new osc::DeflateCompressor(getStateHandler()));

    case NONE:
      DebugLog (<< "Compression disabled: not adding any compressors");
      break;

  }
#else
   DebugLog (<< "Compression not compiled in: not adding any compressors");
#endif
}

/* ====================================================================
* The Vovida Software License, Version 1.0
*
* Copyright (c) 2002-2005 Vovida Networks, Inc.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The names "VOCAL", "Vovida Open Communication Application Library",
*    and "Vovida Open Communication Application Library (VOCAL)" must
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written
*    permission, please contact [e-mail].
*
* 4. Products derived from this software may not be called "VOCAL", nor
*    may "VOCAL" appear in their name, without prior written
*    permission of Vovida Networks, Inc.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
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* ====================================================================
*
* This software consists of voluntary contributions made by Vovida
* Networks, Inc. and many individuals on behalf of Vovida Networks,
* Inc.  For more information on Vovida Networks, Inc., please see
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*
*/