/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_sd.hxx"


#include <tools/debug.hxx>

#include "sdiocmpt.hxx"

//////////////////////////////////////////////////////////////////////////////

old_SdrDownCompat::old_SdrDownCompat(SvStream& rNewStream, sal_uInt16 nNewMode)
:	rStream(rNewStream), 
	nSubRecSiz(0), 
	nSubRecPos(0), 
	nMode(nNewMode),
	bOpen(sal_False)
{
	OpenSubRecord();
}

old_SdrDownCompat::~old_SdrDownCompat()
{
	if(bOpen)
		CloseSubRecord();
}

void old_SdrDownCompat::Read()
{
	rStream >> nSubRecSiz;   
}

void old_SdrDownCompat::Write()
{
	rStream << nSubRecSiz;   
}

void old_SdrDownCompat::OpenSubRecord()
{
	if(rStream.GetError()) 
		return;
	
	nSubRecPos = rStream.Tell(); 

	if(nMode == STREAM_READ) 
	{
		Read();         
	} 
	else if(nMode == STREAM_WRITE) 
	{
		Write();            
	} 

	bOpen = sal_True;
}

void old_SdrDownCompat::CloseSubRecord()
{
	if(rStream.GetError()) 
		return;

	sal_uInt32 nAktPos(rStream.Tell());
	
	if(nMode == STREAM_READ) 
	{
		sal_uInt32 nReadAnz(nAktPos - nSubRecPos);
		if(nReadAnz != nSubRecSiz) 
		{
			rStream.Seek(nSubRecPos + nSubRecSiz); 
		}
	} 
	else if(nMode == STREAM_WRITE) 
	{
		nSubRecSiz = nAktPos - nSubRecPos; 
		rStream.Seek(nSubRecPos);      
		Write();                    
		rStream.Seek(nAktPos);         
	} 
	
	bOpen = sal_False;
}

/*************************************************************************
|*
|* Konstruktor, schreibt bzw. liest Versionsnummer
|*
\************************************************************************/

SdIOCompat::SdIOCompat(SvStream& rNewStream, sal_uInt16 nNewMode, sal_uInt16 nVer)
:	old_SdrDownCompat(rNewStream, nNewMode), nVersion(nVer)
{
	if (nNewMode == STREAM_WRITE)
	{
		DBG_ASSERT(nVer != SDIOCOMPAT_VERSIONDONTKNOW,
				   "kann unbekannte Version nicht schreiben");
		rNewStream << nVersion;
	}
	else if (nNewMode == STREAM_READ)
	{
		DBG_ASSERT(nVer == SDIOCOMPAT_VERSIONDONTKNOW,
				   "Lesen mit Angabe der Version ist Quatsch!");
		rNewStream >> nVersion;
	}
}

SdIOCompat::~SdIOCompat() 
{
}

// eof