DataStream.cxx

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <cassert>
#include "rutil/DataStream.hxx"
#include "rutil/Data.hxx"

// Remove warning about 'this' use in initiator list - pointer is only stored
#if defined(WIN32) && !defined(__GNUC__)
#pragma warning( disable : 4355 ) // using this in base member initializer list 
#endif

using namespace resip;

DataBuffer::DataBuffer(Data& str)
   : mStr(str)
{
#ifdef RESIP_USE_STL_STREAMS
   char* gbuf = const_cast<char*>(mStr.mBuf);
   setg(gbuf, gbuf, gbuf+mStr.size());
   // expose the excess capacity as the put buffer
   setp(gbuf+mStr.mSize, gbuf+mStr.mCapacity);
#endif
}

DataBuffer::~DataBuffer()
{}

#ifndef RESIP_USE_STL_STREAMS
UInt64 DataBuffer::tellpbuf(void)
{ 
   return mStr.size(); 
}

size_t DataBuffer::readbuf(char *buf, size_t count)
{
   if (count <= 0)
   {
      return 0;
   }

   if (!buf)
   {
      assert(0);
      return 0;
   }

   size_t cursize = mStr.size();

   size_t toread = (cursize < count) ? (cursize) : (count);

   memcpy(buf,mStr.begin(),toread);

   //wow, not efficient.  Just added this function for repro, need to revisit. @TODO.
   mStr = mStr.substr(toread);

   return toread;
}

size_t DataBuffer::writebuf(const char *str, size_t count)
{
   if( count <= 0 )
   {
      return 0;
   }

   mStr.append(str,count);
   return count;
}
size_t DataBuffer::putbuf(char ch)
{
   mStr += ch;

   return 1;
}
#else
int
DataBuffer::sync()
{
   size_t len = pptr() - pbase();
   if (len > 0)
   {
      size_t pos = gptr() - eback();  // remember the get position
      mStr.mSize += len;
      char* gbuf = const_cast<char*>(mStr.data());
      // reset the get buffer
      setg(gbuf, gbuf+pos, gbuf+mStr.size());
      // reset the put buffer
      setp(gbuf + mStr.mSize, gbuf + mStr.mCapacity);
   }
   return 0;
}

int
DataBuffer::overflow(int c)
{
   // sync, but reallocate
   size_t len = pptr() - pbase();
   // .kw. test below is always true. Checked with David Butcher
   // and he says this is safe but perhaps performs unrequired
   // re-allocs.
   if (len >= 0)
   {
      size_t pos = gptr() - eback();  // remember the get position

      // update the length
      mStr.mSize += len;

      // resize the underlying Data and reset the input buffer
      mStr.resize(((mStr.mCapacity+16)*3)/2, true);

      char* gbuf = const_cast<char*>(mStr.mBuf);
      // reset the get buffer
      setg(gbuf, gbuf+pos, gbuf+mStr.mSize);
      // reset the put buffer
      setp(gbuf + mStr.mSize, gbuf + mStr.mCapacity);
   }
   if (c != -1)
   {
      mStr.mBuf[mStr.mSize] = c;
      pbump(1);
      return c;
   }
   return 0;
}
#endif

iDataStream::iDataStream(Data& str)
   : DataBuffer(str), 
     DecodeStream(this)
{
}

iDataStream::~iDataStream()
{}

oDataStream::oDataStream(Data& str)
   : DataBuffer(str), 
   EncodeStream(this)
{
   // don't call this with a read-only buffer!
   assert(str.mShareEnum != Data::Share);
}

oDataStream::~oDataStream()
{
   flush();
}

void
oDataStream::reset()
{
   flush();
   mStr.clear();
#ifdef RESIP_USE_STL_STREAMS
   // reset the underlying buffer state
   char* gbuf = const_cast<char*>(mStr.mBuf);
   setg(gbuf, gbuf, gbuf+mStr.size());
   setp(gbuf+mStr.mSize, gbuf+mStr.mCapacity);
#endif
}

DataStream::DataStream(Data& str)
   : DataBuffer(str), 
#ifdef  RESIP_USE_STL_STREAMS
     std::iostream(this)
#else
   ResipFastOStream(this)
#endif
{
   // don't call this with a read-only buffer!
   assert(str.mShareEnum != Data::Share);
}

DataStream::~DataStream()
{
   flush();
}

/* ====================================================================
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