starmath/source/smdetect.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 "smdetect.hxx"
  21 #include <com/sun/star/lang/XMultiServiceFactory.hpp>
  22 #include <com/sun/star/beans/PropertyValue.hpp>
  23 #include <cppuhelper/supportsservice.hxx>
  24 #include <com/sun/star/io/XInputStream.hpp>
  25 #include <sfx2/docfile.hxx>
  26 #include <unotools/mediadescriptor.hxx>
  27
  28 #include "eqnolefilehdr.hxx"
  29
  30 using namespace ::com::sun::star;
  31 using namespace ::com::sun::star::uno;
  32 using namespace ::com::sun::star::io;
  33 using namespace ::com::sun::star::task;
  34 using namespace ::com::sun::star::beans;
  35 using namespace ::com::sun::star::lang;
  36 using utl::MediaDescriptor;
  37
  38 SmFilterDetect::SmFilterDetect( const Reference < XMultiServiceFactory >& /*xFactory*/ )
  39 {
  40 }
  41
  42 SmFilterDetect::~SmFilterDetect()
  43 {
  44 }
  45
  46 OUString SAL_CALL SmFilterDetect::detect( Sequence< PropertyValue >& lDescriptor ) throw( RuntimeException, std::exception )
  47 {
  48     MediaDescriptor aMediaDesc( lDescriptor );
  49     uno::Reference< io::XInputStream > xInStream ( aMediaDesc[MediaDescriptor::PROP_INPUTSTREAM()], uno::UNO_QUERY );
  50     if ( !xInStream.is() )
  51         return OUString();
  52
  53     SfxMedium aMedium;
  54     aMedium.UseInteractionHandler( false );
  55     aMedium.setStreamToLoadFrom( xInStream, true );
  56
  57     SvStream *pInStrm = aMedium.GetInStream();
  58     if ( !pInStrm || pInStrm->GetError() )
  59         return OUString();
  60
  61     // Do not attempt to create an SotStorage on a
  62     // 0-length stream as that would create the compound
  63     // document header on the stream and effectively write to
  64     // disk!
  65     pInStrm->Seek( STREAM_SEEK_TO_BEGIN );
  66     if ( pInStrm->remainingSize() == 0 )
  67         return OUString();
  68
  69     bool bStorageOk = false;
  70     try
  71     {
  72         tools::SvRef<SotStorage> aStorage = new SotStorage( pInStrm, false );
  73         bStorageOk = !aStorage->GetError();
  74         if (bStorageOk)
  75         {
  76             if ( aStorage->IsStream("Equation Native") )
  77             {
  78                 sal_uInt8 nVersion;
  79                 if ( GetMathTypeVersion( aStorage, nVersion ) && nVersion <=3 )
  80                     return OUString("math_MathType_3x");
  81             }
  82         }
  83     }
  84     catch (const css::ucb::ContentCreationException &e)
  85     {
  86         SAL_WARN("starmath", "SmFilterDetect::detect caught " << e.Message);
  87     }
  88
  89     if (!bStorageOk)
  90     {
  91         // 200 should be enough for the XML
  92         // version, encoding and !DOCTYPE
  93         // stuff I hope?
  94         static const sal_uInt16 nBufferSize = 200;
  95         char aBuffer[nBufferSize+1];
  96         aBuffer[nBufferSize] = 0;
  97         pInStrm->Seek( STREAM_SEEK_TO_BEGIN );
  98         pInStrm->StartReadingUnicodeText( RTL_TEXTENCODING_DONTKNOW ); // avoid BOM marker
  99         sal_uLong nBytesRead = pInStrm->Read( aBuffer, nBufferSize );
 100         if (nBytesRead >= 6)
 101         {
 102             bool bIsMathType = false;
 103             if (0 == strncmp( "<?xml", aBuffer, 5))
 104                 bIsMathType = (strstr( aBuffer, "<math>" ) ||
 105                                strstr( aBuffer, "<math " ) ||
 106                                strstr( aBuffer, "<math:math " ));
 107             else
 108                 // this is the old <math tag to MathML in the beginning of the XML file
 109                 bIsMathType = (0 == strncmp( "<math ", aBuffer, 6) ||
 110                                0 == strncmp( "<math> ", aBuffer, 7) ||
 111                                0 == strncmp( "<math:math> ", aBuffer, 12));
 112
 113             if ( bIsMathType )
 114                 return OUString("math_MathML_XML_Math");
 115         }
 116     }
 117
 118     return OUString();
 119 }
 120
 121 /* XServiceInfo */
 122 OUString SAL_CALL SmFilterDetect::getImplementationName() throw( RuntimeException, std::exception )
 123 {
 124     return impl_getStaticImplementationName();
 125 }
 126
 127 /* XServiceInfo */
 128 sal_Bool SAL_CALL SmFilterDetect::supportsService( const OUString& sServiceName ) throw( RuntimeException, std::exception )
 129 {
 130     return cppu::supportsService(this, sServiceName);
 131 }
 132
 133 /* XServiceInfo */
 134 Sequence< OUString > SAL_CALL SmFilterDetect::getSupportedServiceNames() throw( RuntimeException, std::exception )
 135 {
 136     return impl_getStaticSupportedServiceNames();
 137 }
 138
 139 /* Helper for XServiceInfo */
 140 Sequence< OUString > SmFilterDetect::impl_getStaticSupportedServiceNames()
 141 {
 142     return Sequence< OUString >{ "com.sun.star.frame.ExtendedTypeDetection" };
 143 }
 144
 145 /* Helper for XServiceInfo */
 146 OUString SmFilterDetect::impl_getStaticImplementationName()
 147 {
 148     return OUString("com.sun.star.comp.math.FormatDetector");
 149 }
 150
 151 /* Helper for registry */
 152 Reference< XInterface > SAL_CALL SmFilterDetect::impl_createInstance( const Reference< XMultiServiceFactory >& xServiceManager ) throw( Exception )
 153 {
 154     return Reference< XInterface >( *new SmFilterDetect( xServiceManager ) );
 155 }
 156
 157 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */