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600 | /* -*- 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include "filterdet.hxx"
#include "inc/pdfihelper.hxx"
#include "inc/pdfparse.hxx"
#include <osl/file.h>
#include <osl/thread.h>
#include <rtl/digest.h>
#include <sal/log.hxx>
#include <com/sun/star/io/IOException.hpp>
#include <com/sun/star/io/XInputStream.hpp>
#include <com/sun/star/io/XStream.hpp>
#include <com/sun/star/io/XSeekable.hpp>
#include <com/sun/star/io/TempFile.hpp>
#include <com/sun/star/task/XInteractionHandler.hpp>
#include <comphelper/fileurl.hxx>
#include <comphelper/hash.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <tools/diagnose_ex.h>
#include <memory>
#include <string.h>
using namespace com::sun::star;
namespace pdfi
{
// TODO(T3): locking/thread safety
namespace {
class FileEmitContext : public pdfparse::EmitContext
{
private:
oslFileHandle m_aReadHandle;
unsigned int m_nReadLen;
uno::Reference< io::XStream > m_xContextStream;
uno::Reference< io::XSeekable > m_xSeek;
uno::Reference< io::XOutputStream > m_xOut;
public:
FileEmitContext( const OUString& rOrigFile,
const uno::Reference< uno::XComponentContext >& xContext,
const pdfparse::PDFContainer* pTop );
virtual ~FileEmitContext() override;
virtual bool write( const void* pBuf, unsigned int nLen ) override;
virtual unsigned int getCurPos() override;
virtual bool copyOrigBytes( unsigned int nOrigOffset, unsigned int nLen ) override;
virtual unsigned int readOrigBytes( unsigned int nOrigOffset, unsigned int nLen, void* pBuf ) override;
const uno::Reference< io::XStream >& getContextStream() const { return m_xContextStream; }
};
}
FileEmitContext::FileEmitContext( const OUString& rOrigFile,
const uno::Reference< uno::XComponentContext >& xContext,
const pdfparse::PDFContainer* pTop ) :
pdfparse::EmitContext( pTop ),
m_aReadHandle(nullptr),
m_nReadLen(0),
m_xContextStream(),
m_xSeek(),
m_xOut()
{
m_xContextStream.set( io::TempFile::create(xContext), uno::UNO_QUERY_THROW );
m_xOut = m_xContextStream->getOutputStream();
m_xSeek.set(m_xOut, uno::UNO_QUERY_THROW );
oslFileError aErr = osl_File_E_None;<--- Variable 'aErr' is assigned a value that is never used.
if( osl_openFile( rOrigFile.pData,
&m_aReadHandle,
osl_File_OpenFlag_Read ) == osl_File_E_None )
{
if( (aErr=osl_setFilePos( m_aReadHandle,
osl_Pos_End,
0 )) == osl_File_E_None )
{
sal_uInt64 nFileSize = 0;
if( (aErr=osl_getFilePos( m_aReadHandle,
&nFileSize )) == osl_File_E_None )
{
m_nReadLen = static_cast<unsigned int>(nFileSize);
}
}
if( aErr != osl_File_E_None )
{
osl_closeFile( m_aReadHandle );
m_aReadHandle = nullptr;
}
}
m_bDeflate = true;
}
FileEmitContext::~FileEmitContext()
{
if( m_aReadHandle )
osl_closeFile( m_aReadHandle );
}
bool FileEmitContext::write( const void* pBuf, unsigned int nLen )
{
if( ! m_xOut.is() )
return false;
uno::Sequence< sal_Int8 > aSeq( nLen );
memcpy( aSeq.getArray(), pBuf, nLen );
m_xOut->writeBytes( aSeq );
return true;
}
unsigned int FileEmitContext::getCurPos()
{
unsigned int nPos = 0;
if( m_xSeek.is() )
{
nPos = static_cast<unsigned int>( m_xSeek->getPosition() );
}
return nPos;
}
bool FileEmitContext::copyOrigBytes( unsigned int nOrigOffset, unsigned int nLen )
{
if( nOrigOffset + nLen > m_nReadLen )
return false;
if( osl_setFilePos( m_aReadHandle, osl_Pos_Absolut, nOrigOffset ) != osl_File_E_None )
return false;
uno::Sequence< sal_Int8 > aSeq( nLen );
sal_uInt64 nBytesRead = 0;
if( osl_readFile( m_aReadHandle,
aSeq.getArray(),
nLen,
&nBytesRead ) != osl_File_E_None
|| nBytesRead != static_cast<sal_uInt64>(nLen) )
{
return false;
}
m_xOut->writeBytes( aSeq );
return true;
}
unsigned int FileEmitContext::readOrigBytes( unsigned int nOrigOffset, unsigned int nLen, void* pBuf )
{
if( nOrigOffset + nLen > m_nReadLen )
return 0;
if( osl_setFilePos( m_aReadHandle,
osl_Pos_Absolut,
nOrigOffset ) != osl_File_E_None )
{
return 0;
}
sal_uInt64 nBytesRead = 0;
if( osl_readFile( m_aReadHandle,
pBuf,
nLen,
&nBytesRead ) != osl_File_E_None )
{
return 0;
}
return static_cast<unsigned int>(nBytesRead);
}
PDFDetector::PDFDetector( const uno::Reference< uno::XComponentContext >& xContext) :
PDFDetectorBase( m_aMutex ),
m_xContext( xContext )
{}
// XExtendedFilterDetection
OUString SAL_CALL PDFDetector::detect( uno::Sequence< beans::PropertyValue >& rFilterData )
{
osl::MutexGuard const guard( m_aMutex );
bool bSuccess = false;
// get the InputStream carrying the PDF content
uno::Reference< io::XInputStream > xInput;
uno::Reference< io::XStream > xEmbedStream;
OUString aOutFilterName, aOutTypeName;
OUString aURL;
OUString aPwd;
const beans::PropertyValue* pAttribs = rFilterData.getConstArray();
sal_Int32 nAttribs = rFilterData.getLength();
sal_Int32 nFilterNamePos = -1;
sal_Int32 nPwdPos = -1;
for( sal_Int32 i = 0; i < nAttribs; i++ )
{
OUString aVal( "<no string>" );
pAttribs[i].Value >>= aVal;
SAL_INFO( "sdext.pdfimport", "doDetection: Attrib: " + pAttribs[i].Name + " = " + aVal);
if ( pAttribs[i].Name == "InputStream" )
pAttribs[i].Value >>= xInput;
else if ( pAttribs[i].Name == "URL" )
pAttribs[i].Value >>= aURL;
else if ( pAttribs[i].Name == "FilterName" )
nFilterNamePos = i;
else if ( pAttribs[i].Name == "Password" )
{
nPwdPos = i;
pAttribs[i].Value >>= aPwd;
}
}
if( xInput.is() )
{
oslFileHandle aFile = nullptr;
try {
uno::Reference< io::XSeekable > xSeek( xInput, uno::UNO_QUERY );
if( xSeek.is() )
xSeek->seek( 0 );
// read the first 1024 byte (see PDF reference implementation note 12)
const sal_Int32 nHeaderSize = 1024;
uno::Sequence< sal_Int8 > aBuf( nHeaderSize );
sal_uInt64 nBytes = xInput->readBytes( aBuf, nHeaderSize );
if( nBytes > 5 )
{
const sal_Int8* pBytes = aBuf.getConstArray();
for( sal_uInt64 i = 0; i < nBytes-5; i++ )
{
if( pBytes[i] == '%' &&
pBytes[i+1] == 'P' &&
pBytes[i+2] == 'D' &&
pBytes[i+3] == 'F' &&
pBytes[i+4] == '-' )
{
bSuccess = true;
break;
}
}
}
// check for hybrid PDF
if( bSuccess &&
( aURL.isEmpty() || !comphelper::isFileUrl(aURL) )
)
{
sal_uInt64 nWritten = 0;
if( osl_createTempFile( nullptr, &aFile, &aURL.pData ) != osl_File_E_None )
{
bSuccess = false;
}
else
{
SAL_INFO( "sdext.pdfimport", "created temp file " + aURL );
osl_writeFile( aFile, aBuf.getConstArray(), nBytes, &nWritten );
SAL_WARN_IF( nWritten != nBytes, "sdext.pdfimport", "writing of header bytes failed" );
if( nWritten == nBytes )
{
const sal_uInt32 nBufSize = 4096;
aBuf = uno::Sequence<sal_Int8>(nBufSize);
// copy the bytes
do
{
nBytes = xInput->readBytes( aBuf, nBufSize );
if( nBytes > 0 )
{
osl_writeFile( aFile, aBuf.getConstArray(), nBytes, &nWritten );
if( nWritten != nBytes )
{
bSuccess = false;
break;
}
}
} while( nBytes == nBufSize );
}
}
osl_closeFile( aFile );
}
} catch (const css::io::IOException &) {
TOOLS_WARN_EXCEPTION("sdext.pdfimport", "caught");
return OUString();
}
OUString aEmbedMimetype;
xEmbedStream = getAdditionalStream( aURL, aEmbedMimetype, aPwd, m_xContext, rFilterData, false );
if( aFile )
osl_removeFile( aURL.pData );
if( !aEmbedMimetype.isEmpty() )
{
if( aEmbedMimetype == "application/vnd.oasis.opendocument.text"
|| aEmbedMimetype == "application/vnd.oasis.opendocument.text-master" )
aOutFilterName = "writer_pdf_addstream_import";
else if ( aEmbedMimetype == "application/vnd.oasis.opendocument.presentation" )
aOutFilterName = "impress_pdf_addstream_import";
else if( aEmbedMimetype == "application/vnd.oasis.opendocument.graphics"
|| aEmbedMimetype == "application/vnd.oasis.opendocument.drawing" )
aOutFilterName = "draw_pdf_addstream_import";
else if ( aEmbedMimetype == "application/vnd.oasis.opendocument.spreadsheet" )
aOutFilterName = "calc_pdf_addstream_import";
}
}
if( bSuccess )
{
if( !aOutFilterName.isEmpty() )
{
if( nFilterNamePos == -1 )
{
nFilterNamePos = nAttribs;
rFilterData.realloc( ++nAttribs );
rFilterData[ nFilterNamePos ].Name = "FilterName";
}
aOutTypeName = "pdf_Portable_Document_Format";
rFilterData[nFilterNamePos].Value <<= aOutFilterName;
if( xEmbedStream.is() )
{
rFilterData.realloc( ++nAttribs );
rFilterData[nAttribs-1].Name = "EmbeddedSubstream";
rFilterData[nAttribs-1].Value <<= xEmbedStream;
}
if( !aPwd.isEmpty() )
{
if( nPwdPos == -1 )
{
nPwdPos = nAttribs;
rFilterData.realloc( ++nAttribs );
rFilterData[ nPwdPos ].Name = "Password";
}
rFilterData[ nPwdPos ].Value <<= aPwd;
}
}
else
{
if( nFilterNamePos == -1 )
{
nFilterNamePos = nAttribs;
rFilterData.realloc( ++nAttribs );
rFilterData[ nFilterNamePos ].Name = "FilterName";
}
const sal_Int32 nDocumentType = 0; //const sal_Int32 nDocumentType = queryDocumentTypeDialog(m_xContext,aURL);
if( nDocumentType < 0 )
{
return OUString();
}
else switch( nDocumentType )
{
case 0:
rFilterData[nFilterNamePos].Value <<= OUString( "draw_pdf_import" );
break;
case 1:
rFilterData[nFilterNamePos].Value <<= OUString( "impress_pdf_import" );
break;
case 2:
rFilterData[nFilterNamePos].Value <<= OUString( "writer_pdf_import" );
break;
default:
assert(!"Unexpected case");
}
aOutTypeName = "pdf_Portable_Document_Format";
}
}
return aOutTypeName;
}
OUString PDFDetector::getImplementationName()
{
return "org.libreoffice.comp.documents.PDFDetector";
}
sal_Bool PDFDetector::supportsService(OUString const & ServiceName)
{
return cppu::supportsService(this, ServiceName);
}
css::uno::Sequence<OUString> PDFDetector::getSupportedServiceNames()
{
return css::uno::Sequence<OUString>{"com.sun.star.document.ImportFilter"};
}
bool checkDocChecksum( const OUString& rInPDFFileURL,
sal_uInt32 nBytes,
const OUString& rChkSum )
{
if( rChkSum.getLength() != 2* RTL_DIGEST_LENGTH_MD5 )
{
SAL_INFO(
"sdext.pdfimport",
"checksum of length " << rChkSum.getLength() << ", expected "
<< 2*RTL_DIGEST_LENGTH_MD5);
return false;
}
// prepare checksum to test
sal_uInt8 nTestChecksum[ RTL_DIGEST_LENGTH_MD5 ];
const sal_Unicode* pChar = rChkSum.getStr();
for(sal_uInt8 & rn : nTestChecksum)
{
sal_uInt8 nByte = sal_uInt8( ( (*pChar >= '0' && *pChar <= '9') ? *pChar - '0' :
( (*pChar >= 'A' && *pChar <= 'F') ? *pChar - 'A' + 10 :
( (*pChar >= 'a' && *pChar <= 'f') ? *pChar - 'a' + 10 :
0 ) ) ) );
nByte <<= 4;
pChar++;
nByte |= ( (*pChar >= '0' && *pChar <= '9') ? *pChar - '0' :
( (*pChar >= 'A' && *pChar <= 'F') ? *pChar - 'A' + 10 :
( (*pChar >= 'a' && *pChar <= 'f') ? *pChar - 'a' + 10 :
0 ) ) );
pChar++;
rn = nByte;
}
// open file and calculate actual checksum up to index nBytes
::std::vector<unsigned char> nChecksum;
::comphelper::Hash aDigest(::comphelper::HashType::MD5);
oslFileHandle aRead = nullptr;
if( osl_openFile(rInPDFFileURL.pData,
&aRead,
osl_File_OpenFlag_Read ) == osl_File_E_None )
{
sal_uInt8 aBuf[4096];
sal_uInt32 nCur = 0;
sal_uInt64 nBytesRead = 0;
while( nCur < nBytes )
{
sal_uInt32 nPass = std::min<sal_uInt32>(nBytes - nCur, sizeof( aBuf ));
if( osl_readFile( aRead, aBuf, nPass, &nBytesRead) != osl_File_E_None
|| nBytesRead == 0 )
{
break;
}
nPass = static_cast<sal_uInt32>(nBytesRead);
nCur += nPass;
aDigest.update(aBuf, nPass);
}
nChecksum = aDigest.finalize();
osl_closeFile( aRead );
}
// compare the contents
return nChecksum.size() == RTL_DIGEST_LENGTH_MD5
&& (0 == memcmp(nChecksum.data(), nTestChecksum, nChecksum.size()));
}
uno::Reference< io::XStream > getAdditionalStream( const OUString& rInPDFFileURL,
OUString& rOutMimetype,
OUString& io_rPwd,
const uno::Reference<uno::XComponentContext>& xContext,
const uno::Sequence<beans::PropertyValue>& rFilterData,
bool bMayUseUI )
{
uno::Reference< io::XStream > xEmbed;
OString aPDFFile;
OUString aSysUPath;
if( osl_getSystemPathFromFileURL( rInPDFFileURL.pData, &aSysUPath.pData ) != osl_File_E_None )
return xEmbed;
aPDFFile = OUStringToOString( aSysUPath, osl_getThreadTextEncoding() );
std::unique_ptr<pdfparse::PDFEntry> pEntry( pdfparse::PDFReader::read( aPDFFile.getStr() ));
if( pEntry )
{
pdfparse::PDFFile* pPDFFile = dynamic_cast<pdfparse::PDFFile*>(pEntry.get());
if( pPDFFile )
{
unsigned int nElements = pPDFFile->m_aSubElements.size();
while( nElements-- > 0 )
{
pdfparse::PDFTrailer* pTrailer = dynamic_cast<pdfparse::PDFTrailer*>(pPDFFile->m_aSubElements[nElements].get());
if( pTrailer && pTrailer->m_pDict )
{
// search document checksum entry
auto chk = pTrailer->m_pDict->m_aMap.find( "DocChecksum" );
if( chk == pTrailer->m_pDict->m_aMap.end() )
{
SAL_INFO( "sdext.pdfimport", "no DocChecksum entry" );
continue;
}
pdfparse::PDFName* pChkSumName = dynamic_cast<pdfparse::PDFName*>(chk->second);
if( pChkSumName == nullptr )
{
SAL_INFO( "sdext.pdfimport", "no name for DocChecksum entry" );
continue;
}
// search for AdditionalStreams entry
auto add_stream = pTrailer->m_pDict->m_aMap.find( "AdditionalStreams" );
if( add_stream == pTrailer->m_pDict->m_aMap.end() )
{
SAL_INFO( "sdext.pdfimport", "no AdditionalStreams entry" );
continue;
}
pdfparse::PDFArray* pStreams = dynamic_cast<pdfparse::PDFArray*>(add_stream->second);
if( ! pStreams || pStreams->m_aSubElements.size() < 2 )
{
SAL_INFO( "sdext.pdfimport", "AdditionalStreams array too small" );
continue;
}
// check checksum
OUString aChkSum = pChkSumName->getFilteredName();
if( ! checkDocChecksum( rInPDFFileURL, pTrailer->m_nOffset, aChkSum ) )
continue;
// extract addstream and mimetype
pdfparse::PDFName* pMimeType = dynamic_cast<pdfparse::PDFName*>(pStreams->m_aSubElements[0].get());
pdfparse::PDFObjectRef* pStreamRef = dynamic_cast<pdfparse::PDFObjectRef*>(pStreams->m_aSubElements[1].get());
SAL_WARN_IF( !pMimeType, "sdext.pdfimport", "error: no mimetype element" );
SAL_WARN_IF( !pStreamRef, "sdext.pdfimport", "error: no stream ref element" );
if( pMimeType && pStreamRef )
{
pdfparse::PDFObject* pObject = pPDFFile->findObject( pStreamRef->m_nNumber, pStreamRef->m_nGeneration );
SAL_WARN_IF( !pObject, "sdext.pdfimport", "object not found" );
if( pObject )
{
if( pPDFFile->isEncrypted() )
{
bool bAuthenticated = false;
if( !io_rPwd.isEmpty() )
{
OString aIsoPwd = OUStringToOString( io_rPwd,
RTL_TEXTENCODING_ISO_8859_1 );
bAuthenticated = pPDFFile->setupDecryptionData( aIsoPwd.getStr() );
}
if( ! bAuthenticated )
{
uno::Reference< task::XInteractionHandler > xIntHdl;
for( const beans::PropertyValue& rAttrib : rFilterData )
{
if ( rAttrib.Name == "InteractionHandler" )
rAttrib.Value >>= xIntHdl;
}
if( ! bMayUseUI || ! xIntHdl.is() )
{
rOutMimetype = pMimeType->getFilteredName();
xEmbed.clear();
break;
}
OUString aDocName( rInPDFFileURL.copy( rInPDFFileURL.lastIndexOf( '/' )+1 ) );
bool bEntered = false;
do
{
bEntered = getPassword( xIntHdl, io_rPwd, ! bEntered, aDocName );
OString aIsoPwd = OUStringToOString( io_rPwd,
RTL_TEXTENCODING_ISO_8859_1 );
bAuthenticated = pPDFFile->setupDecryptionData( aIsoPwd.getStr() );
} while( bEntered && ! bAuthenticated );
}
if( ! bAuthenticated )
continue;
}
rOutMimetype = pMimeType->getFilteredName();
FileEmitContext aContext( rInPDFFileURL,
xContext,
pPDFFile );
aContext.m_bDecrypt = pPDFFile->isEncrypted();
pObject->writeStream( aContext, pPDFFile );
xEmbed = aContext.getContextStream();
break; // success
}
}
}
}
}
}
return xEmbed;
}
}
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