dffrecordheader.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   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 .
 */
 
#include <filter/msfilter/dffrecordheader.hxx>
 
bool ReadDffRecordHeader(SvStream& rIn, DffRecordHeader& rRec)
{
    rRec.nFilePos = rIn.Tell();
    sal_uInt16 nTmp(0);
    rIn.ReadUInt16(nTmp);
    rRec.nImpVerInst = nTmp;
    rRec.nRecVer = sal::static_int_cast<sal_uInt8>(nTmp & 0x000F);
    rRec.nRecInstance = nTmp >> 4;
    rRec.nRecType = 0;
    rIn.ReadUInt16(rRec.nRecType);
    rRec.nRecLen = 0;
    rIn.ReadUInt32(rRec.nRecLen);
 
    // preserving overflow, optimally we would check
    // the record size against the parent header
    if (rRec.nRecLen > (SAL_MAX_UINT32 - rRec.nFilePos))
        rIn.SetError(SVSTREAM_FILEFORMAT_ERROR);
 
    return rIn.good();
}
 
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