sc/source/filter/oox/biffhelper.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "biffhelper.hxx"
  21
  22 #include <rtl/math.hxx>
  23 #include <rtl/tencinfo.h>
  24 #include <osl/diagnose.h>
  25 #include "biffinputstream.hxx"
  26 #include "worksheethelper.hxx"
  27 #include <oox/helper/binaryoutputstream.hxx>
  28
  29 namespace oox {
  30 namespace xls {
  31
  32 namespace {
  33
  34 const sal_Int32 BIFF_RK_100FLAG             = 0x00000001;
  35 const sal_Int32 BIFF_RK_INTFLAG             = 0x00000002;
  36 const sal_Int32 BIFF_RK_VALUEMASK           = 0xFFFFFFFC;
  37
  38 union DecodedDouble
  39 {
  40     double              mfValue;
  41     sal_math_Double     maStruct;
  42
  43     inline explicit     DecodedDouble() {}
  44     inline explicit     DecodedDouble( double fValue ) : mfValue( fValue ) {}
  45 };
  46
  47 } // namespace
  48
  49 // conversion -----------------------------------------------------------------
  50
  51 /*static*/ double BiffHelper::calcDoubleFromRk( sal_Int32 nRkValue )
  52 {
  53     DecodedDouble aDecDbl( 0.0 );
  54     if( getFlag( nRkValue, BIFF_RK_INTFLAG ) )
  55     {
  56         sal_Int32 nTemp = nRkValue >> 2;
  57         setFlag< sal_Int32 >( nTemp, 0xE0000000, nRkValue < 0 );
  58         aDecDbl.mfValue = nTemp;
  59     }
  60     else
  61     {
  62         aDecDbl.maStruct.w32_parts.msw = static_cast< sal_uInt32 >( nRkValue & BIFF_RK_VALUEMASK );
  63     }
  64
  65     if( getFlag( nRkValue, BIFF_RK_100FLAG ) )
  66         aDecDbl.mfValue /= 100.0;
  67
  68     return aDecDbl.mfValue;
  69 }
  70
  71 /*static*/ double BiffHelper::calcDoubleFromError( sal_uInt8 nErrorCode )
  72 {
  73     sal_uInt16 nApiError = 0x7FFF;
  74     switch( nErrorCode )
  75     {
  76         case BIFF_ERR_NULL:     nApiError = 521;    break;
  77         case BIFF_ERR_DIV0:     nApiError = 532;    break;
  78         case BIFF_ERR_VALUE:    nApiError = 519;    break;
  79         case BIFF_ERR_REF:      nApiError = 524;    break;
  80         case BIFF_ERR_NAME:     nApiError = 525;    break;
  81         case BIFF_ERR_NUM:      nApiError = 503;    break;
  82         case BIFF_ERR_NA:       nApiError = 0x7FFF; break;
  83         default:    OSL_FAIL( "BiffHelper::calcDoubleFromError - unknown error code" );
  84     }
  85     DecodedDouble aDecDbl;
  86     ::rtl::math::setNan( &aDecDbl.mfValue );
  87     aDecDbl.maStruct.nan_parts.fraction_lo = nApiError;
  88     return aDecDbl.mfValue;
  89 }
  90
  91 // BIFF12 import --------------------------------------------------------------
  92
  93 /*static*/ OUString BiffHelper::readString( SequenceInputStream& rStrm, bool b32BitLen, bool bAllowNulChars )
  94 {
  95     OUString aString;
  96     if( !rStrm.isEof() )
  97     {
  98         sal_Int32 nCharCount = b32BitLen ? rStrm.readValue< sal_Int32 >() : rStrm.readValue< sal_Int16 >();
  99         // string length -1 is often used to indicate a missing string
 100         OSL_ENSURE( !rStrm.isEof() && (nCharCount >= -1), "BiffHelper::readString - invalid string length" );
 101         if( !rStrm.isEof() && (nCharCount > 0) )
 102         {
 103             // SequenceInputStream always supports getRemaining()
 104             nCharCount = ::std::min( nCharCount, static_cast< sal_Int32 >( rStrm.getRemaining() / 2 ) );
 105             aString = rStrm.readUnicodeArray( nCharCount, bAllowNulChars );
 106         }
 107     }
 108     return aString;
 109 }
 110
 111 // BIFF2-BIFF8 import ---------------------------------------------------------
 112
 113 /*static*/ bool BiffHelper::isBofRecord( BiffInputStream& rStrm )
 114 {
 115     return
 116         (rStrm.getRecId() == BIFF2_ID_BOF) ||
 117         (rStrm.getRecId() == BIFF3_ID_BOF) ||
 118         (rStrm.getRecId() == BIFF4_ID_BOF) ||
 119         (rStrm.getRecId() == BIFF5_ID_BOF);
 120 }
 121
 122 /*static*/ bool BiffHelper::skipRecordBlock( BiffInputStream& rStrm, sal_uInt16 nEndRecId )
 123 {
 124     sal_uInt16 nStartRecId = rStrm.getRecId();
 125     while( rStrm.startNextRecord() && (rStrm.getRecId() != nEndRecId) )
 126         if( rStrm.getRecId() == nStartRecId )
 127             skipRecordBlock( rStrm, nEndRecId );
 128     return !rStrm.isEof() && (rStrm.getRecId() == nEndRecId);
 129 }
 130
 131 } // namespace xls
 132 } // namespace oox
 133
 134 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */