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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include "filterdetect.hxx"
#include <svtools/htmltokn.h>
#include <tools/urlobj.hxx>
#include <tools/zcodec.hxx>
#include <ucbhelper/content.hxx>
#include <unotools/mediadescriptor.hxx>
#include <unotools/streamwrap.hxx>
#include <unotools/ucbstreamhelper.hxx>
#include <com/sun/star/lang/XMultiServiceFactory.hpp>
#include <com/sun/star/io/XInputStream.hpp>
#include <cppuhelper/supportsservice.hxx>
#include <memory>
#define WRITER_TEXT_FILTER "Text"
#define CALC_TEXT_FILTER "Text - txt - csv (StarCalc)"
#define WEB_HTML_FILTER "HTML"
#define WRITER_HTML_FILTER "HTML (StarWriter)"
#define CALC_HTML_FILTER "calc_HTML_WebQuery"
#define WRITER_DOCSERVICE "com.sun.star.text.TextDocument"
#define CALC_DOCSERVICE "com.sun.star.sheet.SpreadsheetDocument"
using namespace ::com::sun::star;
using utl::MediaDescriptor;
namespace {
bool IsHTMLStream( const uno::Reference<io::XInputStream>& xInStream )
{
std::unique_ptr<SvStream> pInStream( utl::UcbStreamHelper::CreateStream( xInStream ) );
if ( !pInStream || pInStream->GetError() )
// No stream
return false;
// Read the stream header
pInStream->StartReadingUnicodeText( RTL_TEXTENCODING_DONTKNOW );
const sal_Size nUniPos = pInStream->Tell();
const sal_uInt16 nSize = 4096;
OString sHeader;
if ( nUniPos == 3 || nUniPos == 0 ) // UTF-8 or non-Unicode
sHeader = read_uInt8s_ToOString( *pInStream, nSize );
else // UTF-16 (nUniPos = 2)
sHeader = OUStringToOString( read_uInt16s_ToOUString( *pInStream, nSize ), RTL_TEXTENCODING_ASCII_US );
// Now check whether the stream begins with a known HTML tag.
enum DetectPhase { BeforeTag, TagOpened, InTagName };
DetectPhase dp = BeforeTag;
const char* pHeader = sHeader.getStr();
const int nLength = sHeader.getLength();
int i = 0, nStartOfTagIndex = 0;
for ( i = 0; i < nLength; ++i, ++pHeader )
{
char c = *pHeader;
if ( c == ' ' || c == '\n' || c == '\t' || c == '\r' || c == '\f' )
{
if ( dp == TagOpened )
return false; // Invalid: Should start with a tag name
else if ( dp == InTagName )
break; // End of tag name reached
}
else if ( c == '<' )
{
if ( dp == BeforeTag )
dp = TagOpened;
else
return false; // Invalid: Nested '<'
}
else if ( c == '>' )
{
if ( dp == InTagName )
break; // End of tag name reached
else
return false; // Invalid: Empty tag or before '<'
}
else if ( c == '!' )
{
if ( dp == TagOpened )
return true; // "<!" - DOCTYPE or comments block
else
return false; // Invalid: '!' before '<' or inside tag name
}
else
{
if ( dp == BeforeTag )
return false; // Invalid: Should start with a tag
else if ( dp == TagOpened )
{
nStartOfTagIndex = i;
dp = InTagName;
}
}
}
// The string following '<' has to be a known HTML token.
OString aToken = sHeader.copy( nStartOfTagIndex, i - nStartOfTagIndex );
if ( GetHTMLToken( OStringToOUString( aToken.toAsciiLowerCase(), RTL_TEXTENCODING_ASCII_US ) ) != 0 )
return true;
return false;
}
}
PlainTextFilterDetect::PlainTextFilterDetect() {}
PlainTextFilterDetect::~PlainTextFilterDetect() {}
OUString SAL_CALL PlainTextFilterDetect::detect(uno::Sequence<beans::PropertyValue>& lDescriptor) throw (uno::RuntimeException, std::exception)
{
MediaDescriptor aMediaDesc(lDescriptor);
OUString aType = aMediaDesc.getUnpackedValueOrDefault(MediaDescriptor::PROP_TYPENAME(), OUString() );
OUString aDocService = aMediaDesc.getUnpackedValueOrDefault(MediaDescriptor::PROP_DOCUMENTSERVICE(), OUString() );
if ((aType == "generic_HTML") || (aType == "calc_HTML"))
{
uno::Reference<io::XInputStream> xInStream(aMediaDesc[MediaDescriptor::PROP_INPUTSTREAM()], uno::UNO_QUERY);
if (!xInStream.is() || !IsHTMLStream(xInStream))
return OUString();
if ((aDocService == CALC_DOCSERVICE) || (aType == "calc_HTML"))
aMediaDesc[MediaDescriptor::PROP_FILTERNAME()] <<= OUString(CALC_HTML_FILTER);
else if (aDocService == WRITER_DOCSERVICE)
aMediaDesc[MediaDescriptor::PROP_FILTERNAME()] <<= OUString(WRITER_HTML_FILTER);
else
aMediaDesc[MediaDescriptor::PROP_FILTERNAME()] <<= OUString(WEB_HTML_FILTER);
}
else if (aType == "generic_Text")
{
uno::Reference<io::XStream> xStream(aMediaDesc[MediaDescriptor::PROP_STREAM()], uno::UNO_QUERY);
uno::Reference<io::XInputStream> xInStream(aMediaDesc[MediaDescriptor::PROP_INPUTSTREAM()], uno::UNO_QUERY);
if (xStream.is() || xInStream.is())
{
ZCodec aCodecGZ;
std::unique_ptr<SvStream> pInStream;
if (xStream.is())
pInStream.reset(utl::UcbStreamHelper::CreateStream(xStream));
else
pInStream.reset(utl::UcbStreamHelper::CreateStream(xInStream));
std::unique_ptr<SvMemoryStream> pDecompressedStream(new SvMemoryStream());
if (aCodecGZ.AttemptDecompression(*pInStream, *pDecompressedStream, false, true))
{
uno::Reference<io::XStream> xStreamDecompressed(new utl::OStreamWrapper(*pDecompressedStream));
pDecompressedStream.release();
aMediaDesc[MediaDescriptor::PROP_STREAM()] <<= xStreamDecompressed;
aMediaDesc[MediaDescriptor::PROP_INPUTSTREAM()] <<= xStreamDecompressed->getInputStream();
OUString aURL = aMediaDesc.getUnpackedValueOrDefault(MediaDescriptor::PROP_URL(), OUString() );
sal_Int32 nIdx = aURL.lastIndexOf(".gz");
if (nIdx != -1)
aMediaDesc[MediaDescriptor::PROP_URL()] <<= aURL.copy(0, nIdx);
}
}
// Get the file name extension.
INetURLObject aParser(aMediaDesc.getUnpackedValueOrDefault(MediaDescriptor::PROP_URL(), OUString() ) );
OUString aExt = aParser.getExtension(INetURLObject::LAST_SEGMENT, true, INetURLObject::DECODE_WITH_CHARSET);
aExt = aExt.toAsciiLowerCase();
OUString aName = aParser.getName().toAsciiLowerCase();
// Decide which filter to use based on the document service first,
// then on extension if that's not available.
if (aDocService == CALC_DOCSERVICE)
aMediaDesc[MediaDescriptor::PROP_FILTERNAME()] <<= OUString(CALC_TEXT_FILTER);
else if (aDocService == WRITER_DOCSERVICE)
aMediaDesc[MediaDescriptor::PROP_FILTERNAME()] <<= OUString(WRITER_TEXT_FILTER);
else if (aExt == "csv" || aExt == "tsv" || aExt == "tab" || aExt == "xls" || aName.endsWith(".csv.gz"))
aMediaDesc[MediaDescriptor::PROP_FILTERNAME()] <<= OUString(CALC_TEXT_FILTER);
else
aMediaDesc[MediaDescriptor::PROP_FILTERNAME()] <<= OUString(WRITER_TEXT_FILTER);
}
else
// Nothing to detect.
return OUString();
aMediaDesc >> lDescriptor;
return aType;
}
// XInitialization
void SAL_CALL PlainTextFilterDetect::initialize(const uno::Sequence<uno::Any>& /*aArguments*/)
throw (uno::Exception, uno::RuntimeException, std::exception)
{
}
OUString PlainTextFilterDetect_getImplementationName()
{
return OUString("com.sun.star.comp.filters.PlainTextFilterDetect");
}
uno::Sequence<OUString> PlainTextFilterDetect_getSupportedServiceNames()
{
uno::Sequence<OUString> aRet(2);
OUString* pArray = aRet.getArray();
pArray[0] = "com.sun.star.document.ExtendedTypeDetection";
pArray[1] = "com.sun.star.comp.filters.PlainTextFilterDetect";
return aRet;
}
// XServiceInfo
OUString SAL_CALL PlainTextFilterDetect::getImplementationName()
throw (uno::RuntimeException, std::exception)
{
return PlainTextFilterDetect_getImplementationName();
}
sal_Bool SAL_CALL PlainTextFilterDetect::supportsService(const OUString& rServiceName)
throw (uno::RuntimeException, std::exception)
{
return cppu::supportsService(this, rServiceName);
}
uno::Sequence<OUString> SAL_CALL PlainTextFilterDetect::getSupportedServiceNames()
throw (uno::RuntimeException, std::exception)
{
return PlainTextFilterDetect_getSupportedServiceNames();
}
extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface* SAL_CALL
com_sun_star_comp_filters_PlainTextFilterDetect_get_implementation(css::uno::XComponentContext* ,
css::uno::Sequence<css::uno::Any> const &)
{
return cppu::acquire(new PlainTextFilterDetect);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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