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