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