/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
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// 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, UINT16 nNewMode)
:	rStream(rNewStream), 
    nSubRecSiz(0), 
    nSubRecPos(0), 
    nMode(nNewMode),
    bOpen(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 = TRUE;
}

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

    UINT32 nAktPos(rStream.Tell());
    
    if(nMode == STREAM_READ) 
    {
        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 = FALSE;
}

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

SdIOCompat::SdIOCompat(SvStream& rNewStream, USHORT nNewMode, 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

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
