lotuswordpro/source/filter/lwpobjhdr.cxx

   1 /*************************************************************************
   2  *
   3  *  The Contents of this file are made available subject to the terms of
   4  *  either of the following licenses
   5  *
   6  *         - GNU Lesser General Public License Version 2.1
   7  *         - Sun Industry Standards Source License Version 1.1
   8  *
   9  *  Sun Microsystems Inc., October, 2000
  10  *
  11  *  GNU Lesser General Public License Version 2.1
  12  *  =============================================
  13  *  Copyright 2000 by Sun Microsystems, Inc.
  14  *  901 San Antonio Road, Palo Alto, CA 94303, USA
  15  *
  16  *  This library is free software; you can redistribute it and/or
  17  *  modify it under the terms of the GNU Lesser General Public
  18  *  License version 2.1, as published by the Free Software Foundation.
  19  *
  20  *  This library is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  23  *  Lesser General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU Lesser General Public
  26  *  License along with this library; if not, write to the Free Software
  27  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  *  MA  02111-1307  USA
  29  *
  30  *
  31  *  Sun Industry Standards Source License Version 1.1
  32  *  =================================================
  33  *  The contents of this file are subject to the Sun Industry Standards
  34  *  Source License Version 1.1 (the "License"); You may not use this file
  35  *  except in compliance with the License. You may obtain a copy of the
  36  *  License at http://www.openoffice.org/license.html.
  37  *
  38  *  Software provided under this License is provided on an "AS IS" basis,
  39  *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
  40  *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
  41  *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
  42  *  See the License for the specific provisions governing your rights and
  43  *  obligations concerning the Software.
  44  *
  45  *  The Initial Developer of the Original Code is: IBM Corporation
  46  *
  47  *  Copyright: 2008 by IBM Corporation
  48  *
  49  *  All Rights Reserved.
  50  *
  51  *  Contributor(s): _______________________________________
  52  *
  53  *
  54  ************************************************************************/
  55 /*************************************************************************
  56  * @file
  57  *  For LWP filter architecture prototype
  58  ************************************************************************/
  59
  60 #include <lwpobjhdr.hxx>
  61 #include <lwpobjtags.hxx>
  62 #include <lwpdefs.hxx>
  63 #include <lwpfilehdr.hxx>
  64
  65 LwpObjectHeader::LwpObjectHeader()
  66     : m_nTag(0)
  67     , m_nSize(0)
  68     , m_bCompressed(false)
  69 {
  70 }
  71 /**
  72  * @descr  read header from stream
  73   */
  74 bool LwpObjectHeader::Read(LwpSvStream& rStrm)
  75 {
  76     sal_uInt32 nVersionID = 0;
  77     sal_uInt32 nRefCount = 0;
  78     sal_uInt32 nNextVersionOffset = 0;
  79     sal_uInt32 nHeaderSize = 0;
  80
  81     sal_Int64 nStartPos = rStrm.Tell();
  82
  83     if (LwpFileHeader::m_nFileRevision < 0x000B)
  84     {
  85         rStrm.ReadUInt32(m_nTag);
  86         m_ID.Read(&rStrm);
  87         rStrm.ReadUInt32(nVersionID);
  88         rStrm.ReadUInt32(nRefCount);
  89         rStrm.ReadUInt32(nNextVersionOffset);
  90
  91         nHeaderSize = sizeof(m_nTag) + LwpObjectID::DiskSize() + sizeof(nVersionID)
  92                       + sizeof(nRefCount) + sizeof(nNextVersionOffset) + sizeof(m_nSize);
  93
  94         if ((m_nTag == TAG_AMI) || (LwpFileHeader::m_nFileRevision < 0x0006))
  95         {
  96             sal_uInt32 nNextVersionID = 0;
  97             rStrm.ReadUInt32(nNextVersionID);
  98             nHeaderSize += sizeof(nNextVersionID);
  99         }
 100         rStrm.ReadUInt32(m_nSize);
 101     }
 102     else
 103     {
 104         sal_uInt8 nFlagBits = 0;
 105         sal_uInt16 VOType = 0;
 106         if (rStrm.remainingSize() < 3)
 107             return false;
 108         rStrm.ReadUInt16(VOType);
 109         rStrm.ReadUInt8(nFlagBits);
 110
 111         m_nTag = static_cast<sal_uInt32>(VOType);
 112         m_ID.ReadIndexed(&rStrm);
 113         nHeaderSize = sizeof(VOType) + sizeof(nFlagBits) + m_ID.DiskSizeIndexed();
 114
 115         sal_uInt8 tmpByte;
 116         sal_uInt16 tmpShort;
 117         switch (nFlagBits & VERSION_BITS)
 118         {
 119             case ONE_BYTE_VERSION:
 120                 rStrm.ReadUInt8(tmpByte);
 121                 nVersionID = static_cast<sal_uInt32>(tmpByte);
 122                 nHeaderSize++;
 123                 break;
 124
 125             case TWO_BYTE_VERSION:
 126                 rStrm.ReadUInt16(tmpShort);
 127                 nVersionID = static_cast<sal_uInt32>(tmpShort);
 128                 nHeaderSize += 2;
 129                 break;
 130
 131             case FOUR_BYTE_VERSION:
 132                 rStrm.ReadUInt32(nVersionID);
 133                 nHeaderSize += 4;
 134                 break;
 135             case DEFAULT_VERSION: //fall through
 136             default:
 137                 nVersionID = 2;
 138                 break; // nothing
 139         }
 140
 141         switch (nFlagBits & REFCOUNT_BITS)
 142         {
 143             case ONE_BYTE_REFCOUNT:
 144                 rStrm.ReadUInt8(tmpByte);
 145                 nRefCount = static_cast<sal_uInt32>(tmpByte);
 146                 nHeaderSize++;
 147                 break;
 148
 149             case TWO_BYTE_REFCOUNT:
 150                 rStrm.ReadUInt16(tmpShort);
 151                 nRefCount = static_cast<sal_uInt32>(tmpShort);
 152                 nHeaderSize += 2;
 153                 break;
 154
 155             case FOUR_BYTE_REFCOUNT: //through
 156             default:
 157                 rStrm.ReadUInt32(nRefCount);
 158                 nHeaderSize += 4;
 159                 break;
 160         }
 161
 162         if (nFlagBits & HAS_PREVOFFSET)
 163         {
 164             rStrm.ReadUInt32(nNextVersionOffset);
 165             nHeaderSize += 4;
 166         }
 167         else
 168             nNextVersionOffset = BAD_OFFSET;
 169
 170         switch (nFlagBits & SIZE_BITS)
 171         {
 172             case ONE_BYTE_SIZE:
 173                 rStrm.ReadUInt8(tmpByte);
 174                 m_nSize = static_cast<sal_uInt32>(tmpByte);
 175                 nHeaderSize++;
 176                 break;
 177
 178             case TWO_BYTE_SIZE:
 179                 rStrm.ReadUInt16(tmpShort);
 180                 m_nSize = static_cast<sal_uInt32>(tmpShort);
 181                 nHeaderSize += 2;
 182                 break;
 183
 184             case FOUR_BYTE_SIZE: //go through
 185             default:
 186                 rStrm.ReadUInt32(m_nSize);
 187                 nHeaderSize += 4;
 188                 break;
 189         }
 190
 191         if (nFlagBits & DATA_COMPRESSED)
 192         {
 193             m_bCompressed = true;
 194         }
 195     }
 196     sal_Int64 nEndPos = rStrm.Tell();
 197     return rStrm.good() && (nStartPos + nHeaderSize == nEndPos);
 198 }
 199
 200 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */