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