404 lines
16 KiB
C++
404 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#include "oox/vml/vmlinputstream.hxx"
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#include <com/sun/star/io/XTextInputStream.hpp>
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#include <map>
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#include <string.h>
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#include <rtl/strbuf.hxx>
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#include "oox/helper/helper.hxx"
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#include "oox/helper/textinputstream.hxx"
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namespace oox {
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namespace vml {
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// ============================================================================
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using namespace ::com::sun::star::io;
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using namespace ::com::sun::star::uno;
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using ::rtl::OString;
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using ::rtl::OStringBuffer;
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// ============================================================================
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namespace {
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inline const sal_Char* lclFindCharacter( const sal_Char* pcBeg, const sal_Char* pcEnd, sal_Char cChar )
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{
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sal_Int32 nIndex = rtl_str_indexOfChar_WithLength( pcBeg, static_cast< sal_Int32 >( pcEnd - pcBeg ), cChar );
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return (nIndex < 0) ? pcEnd : (pcBeg + nIndex);
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}
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inline bool lclIsWhiteSpace( sal_Char cChar )
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{
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return cChar < 32;
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}
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const sal_Char* lclFindWhiteSpace( const sal_Char* pcBeg, const sal_Char* pcEnd )
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{
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for( ; pcBeg < pcEnd; ++pcBeg )
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if( lclIsWhiteSpace( *pcBeg ) )
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return pcBeg;
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return pcEnd;
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}
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const sal_Char* lclFindNonWhiteSpace( const sal_Char* pcBeg, const sal_Char* pcEnd )
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{
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for( ; pcBeg < pcEnd; ++pcBeg )
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if( !lclIsWhiteSpace( *pcBeg ) )
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return pcBeg;
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return pcEnd;
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}
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const sal_Char* lclTrimWhiteSpaceFromEnd( const sal_Char* pcBeg, const sal_Char* pcEnd )
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{
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while( (pcBeg < pcEnd) && lclIsWhiteSpace( pcEnd[ -1 ] ) )
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--pcEnd;
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return pcEnd;
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}
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inline void lclAppendToBuffer( OStringBuffer& rBuffer, const sal_Char* pcBeg, const sal_Char* pcEnd )
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{
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rBuffer.append( pcBeg, static_cast< sal_Int32 >( pcEnd - pcBeg ) );
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}
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// ----------------------------------------------------------------------------
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void lclProcessAttribs( OStringBuffer& rBuffer, const sal_Char* pcBeg, const sal_Char* pcEnd )
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{
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/* Map attribute names to char-pointer of all attributes. This map is used
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to find multiple occurrences of attributes with the same name. The
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mapped pointers are used as map key in the next map below. */
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typedef ::std::map< OString, const sal_Char* > AttributeNameMap;
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AttributeNameMap aAttributeNames;
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/* Map the char-pointers of all attributes to the full attribute definition
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string. This preserves the original order of the used attributes. */
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typedef ::std::map< const sal_Char*, OString > AttributeDataMap;
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AttributeDataMap aAttributes;
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bool bOk = true;
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const sal_Char* pcNameBeg = pcBeg;
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while( bOk && (pcNameBeg < pcEnd) )
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{
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// pcNameBeg points to begin of attribute name, find equality sign
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const sal_Char* pcEqualSign = lclFindCharacter( pcNameBeg, pcEnd, '=' );
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if( (bOk = pcEqualSign < pcEnd) == true )
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{
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// find end of attribute name (ignore whitespace between name and equality sign)
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const sal_Char* pcNameEnd = lclTrimWhiteSpaceFromEnd( pcNameBeg, pcEqualSign );
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if( (bOk = pcNameBeg < pcNameEnd) == true )
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{
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// find begin of attribute value (must be single or double quote)
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const sal_Char* pcValueBeg = lclFindNonWhiteSpace( pcEqualSign + 1, pcEnd );
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if( (bOk = (pcValueBeg < pcEnd) && ((*pcValueBeg == '\'') || (*pcValueBeg == '"'))) == true )
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{
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// find end of attribute value (matching quote character)
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const sal_Char* pcValueEnd = lclFindCharacter( pcValueBeg + 1, pcEnd, *pcValueBeg );
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if( (bOk = pcValueEnd < pcEnd) == true )
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{
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++pcValueEnd;
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OString aAttribName( pcNameBeg, static_cast< sal_Int32 >( pcNameEnd - pcNameBeg ) );
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OString aAttribData( pcNameBeg, static_cast< sal_Int32 >( pcValueEnd - pcNameBeg ) );
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// search for an existing attribute with the same name
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AttributeNameMap::iterator aIt = aAttributeNames.find( aAttribName );
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// remove its definition from the data map
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if( aIt != aAttributeNames.end() )
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aAttributes.erase( aIt->second );
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// insert the attribute into both maps
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aAttributeNames[ aAttribName ] = pcNameBeg;
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aAttributes[ pcNameBeg ] = aAttribData;
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// continue with next attribute (skip whitespace after this attribute)
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pcNameBeg = pcValueEnd;
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if( (pcNameBeg < pcEnd) && ((bOk = lclIsWhiteSpace( *pcNameBeg )) == true) )
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pcNameBeg = lclFindNonWhiteSpace( pcNameBeg + 1, pcEnd );
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}
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}
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}
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}
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}
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// if no error has occurred, build the resulting attribute list
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if( bOk )
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for( AttributeDataMap::iterator aIt = aAttributes.begin(), aEnd = aAttributes.end(); aIt != aEnd; ++aIt )
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rBuffer.append( ' ' ).append( aIt->second );
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// on error, just append the complete passed string
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else
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lclAppendToBuffer( rBuffer, pcBeg, pcEnd );
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}
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void lclProcessElement( OStringBuffer& rBuffer, const OString& rElement )
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{
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// check that passed string starts and ends with the brackets of an XML element
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sal_Int32 nElementLen = rElement.getLength();
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if( nElementLen == 0 )
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return;
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const sal_Char* pcOpen = rElement.getStr();
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const sal_Char* pcClose = pcOpen + nElementLen - 1;
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// no complete element found
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if( (pcOpen >= pcClose) || (*pcOpen != '<') || (*pcClose != '>') )
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{
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// just append all passed characters
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rBuffer.append( rElement );
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}
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// skip parser instructions: '<![...]>'
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else if( (nElementLen >= 5) && (pcOpen[ 1 ] == '!') && (pcOpen[ 2 ] == '[') && (pcClose[ -1 ] == ']') )
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{
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// do nothing
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}
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// replace '<br>' element with newline
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else if( (nElementLen >= 4) && (pcOpen[ 1 ] == 'b') && (pcOpen[ 2 ] == 'r') && (lclFindNonWhiteSpace( pcOpen + 3, pcClose ) == pcClose) )
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{
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rBuffer.append( '\n' );
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}
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// check start elements and simple elements for repeated attributes
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else if( pcOpen[ 1 ] != '/' )
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{
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// find positions of text content inside brackets, exclude '/' in '<simpleelement/>'
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const sal_Char* pcContentBeg = pcOpen + 1;
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bool bIsEmptyElement = pcClose[ -1 ] == '/';
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const sal_Char* pcContentEnd = bIsEmptyElement ? (pcClose - 1) : pcClose;
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// append opening bracket and element name to buffer
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const sal_Char* pcWhiteSpace = lclFindWhiteSpace( pcContentBeg, pcContentEnd );
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lclAppendToBuffer( rBuffer, pcOpen, pcWhiteSpace );
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// find begin of attributes, and process all attributes
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const sal_Char* pcAttribBeg = lclFindNonWhiteSpace( pcWhiteSpace, pcContentEnd );
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if( pcAttribBeg < pcContentEnd )
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lclProcessAttribs( rBuffer, pcAttribBeg, pcContentEnd );
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// close the element
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if( bIsEmptyElement )
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rBuffer.append( '/' );
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rBuffer.append( '>' );
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}
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// append end elements without further processing
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else
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{
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rBuffer.append( rElement );
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}
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}
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bool lclProcessCharacters( OStringBuffer& rBuffer, const OString& rChars )
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{
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/* MSO has a very weird way to store and handle whitespaces. The stream
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may contain lots of spaces, tabs, and newlines which have to be handled
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as single space character. This will be done in this function.
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If the element text contains a literal line break, it will be stored as
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<br> tag (without matching </br> element). This input stream wrapper
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will replace this element with a literal LF character (see below).
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A single space character for its own is stored as is. Example: The
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element
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<font> </font>
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represents a single space character. The XML parser will ignore this
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space character completely without issuing a 'characters' event. The
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VML import filter implementation has to react on this case manually.
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A single space character following another character is stored
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literally and must not be stipped away here. Example: The element
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<font>abc </font>
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contains the three letters a, b, and c, followed by a space character.
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Consecutive space characters, or a leading single space character, are
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stored in a <span> element. If there are N space characters (N > 1),
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then the <span> element contains exactly (N-1) NBSP (non-breaking
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space) characters, followed by a regular space character. Examples:
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The element
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<font><span style='mso-spacerun:yes'>\xA0\xA0\xA0 </span></font>
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represents 4 consecutive space characters. Has to be handled by the
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implementation. The element
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<font><span style='mso-spacerun:yes'> abc</span></font>
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represents a space characters followed by the letters a, b, c. These
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strings have to be handled by the VML import filter implementation.
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*/
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// passed string ends with the leading opening bracket of an XML element
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const sal_Char* pcBeg = rChars.getStr();
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const sal_Char* pcEnd = pcBeg + rChars.getLength();
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bool bHasBracket = (pcBeg < pcEnd) && (pcEnd[ -1 ] == '<');
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if( bHasBracket ) --pcEnd;
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// skip leading whitespace
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const sal_Char* pcContentsBeg = lclFindNonWhiteSpace( pcBeg, pcEnd );
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while( pcContentsBeg < pcEnd )
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{
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const sal_Char* pcWhitespaceBeg = lclFindWhiteSpace( pcContentsBeg + 1, pcEnd );
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lclAppendToBuffer( rBuffer, pcContentsBeg, pcWhitespaceBeg );
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if( pcWhitespaceBeg < pcEnd )
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rBuffer.append( ' ' );
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pcContentsBeg = lclFindNonWhiteSpace( pcWhitespaceBeg, pcEnd );
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}
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return bHasBracket;
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}
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} // namespace
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// ============================================================================
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InputStream::InputStream( const Reference< XComponentContext >& rxContext, const Reference< XInputStream >& rxInStrm ) :
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// use single-byte ISO-8859-1 encoding which maps all byte characters to the first 256 Unicode characters
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mxTextStrm( TextInputStream::createXTextInputStream( rxContext, rxInStrm, RTL_TEXTENCODING_ISO_8859_1 ) ),
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maOpeningBracket( 1 ),
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maClosingBracket( 1 ),
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maOpeningCData( CREATE_OSTRING( "<![CDATA[" ) ),
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maClosingCData( CREATE_OSTRING( "]]>" ) ),
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mnBufferPos( 0 )
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{
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maOpeningBracket[ 0 ] = '<';
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maClosingBracket[ 0 ] = '>';
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}
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InputStream::~InputStream()
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{
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}
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sal_Int32 SAL_CALL InputStream::readBytes( Sequence< sal_Int8 >& rData, sal_Int32 nBytesToRead )
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throw (NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
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{
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if( nBytesToRead < 0 )
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throw IOException();
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rData.realloc( nBytesToRead );
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sal_Int8* pcDest = rData.getArray();
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sal_Int32 nRet = 0;
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while( (nBytesToRead > 0) && !mxTextStrm->isEOF() )
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{
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updateBuffer();
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sal_Int32 nReadSize = ::std::min( nBytesToRead, maBuffer.getLength() - mnBufferPos );
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if( nReadSize > 0 )
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{
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memcpy( pcDest + nRet, maBuffer.getStr() + mnBufferPos, static_cast< size_t >( nReadSize ) );
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mnBufferPos += nReadSize;
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nBytesToRead -= nReadSize;
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nRet += nReadSize;
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}
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}
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if( nRet < rData.getLength() )
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rData.realloc( nRet );
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return nRet;
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}
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sal_Int32 SAL_CALL InputStream::readSomeBytes( Sequence< sal_Int8 >& rData, sal_Int32 nMaxBytesToRead )
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throw (NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
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{
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return readBytes( rData, nMaxBytesToRead );
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}
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void SAL_CALL InputStream::skipBytes( sal_Int32 nBytesToSkip )
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throw (NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
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{
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if( nBytesToSkip < 0 )
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throw IOException();
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while( (nBytesToSkip > 0) && !mxTextStrm->isEOF() )
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{
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updateBuffer();
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sal_Int32 nSkipSize = ::std::min( nBytesToSkip, maBuffer.getLength() - mnBufferPos );
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mnBufferPos += nSkipSize;
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nBytesToSkip -= nSkipSize;
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}
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}
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sal_Int32 SAL_CALL InputStream::available() throw (NotConnectedException, IOException, RuntimeException)
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{
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updateBuffer();
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return maBuffer.getLength() - mnBufferPos;
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}
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void SAL_CALL InputStream::closeInput() throw (NotConnectedException, IOException, RuntimeException)
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{
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mxTextStrm->closeInput();
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}
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// private --------------------------------------------------------------------
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void InputStream::updateBuffer() throw (IOException, RuntimeException)
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{
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while( (mnBufferPos >= maBuffer.getLength()) && !mxTextStrm->isEOF() )
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{
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// collect new contents in a string buffer
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OStringBuffer aBuffer;
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// read and process characters until the opening bracket of the next XML element
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OString aChars = readToElementBegin();
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bool bHasOpeningBracket = lclProcessCharacters( aBuffer, aChars );
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// read and process characters until (and including) closing bracket (an XML element)
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OSL_ENSURE( bHasOpeningBracket || mxTextStrm->isEOF(), "InputStream::updateBuffer - missing opening bracket of XML element" );
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if( bHasOpeningBracket && !mxTextStrm->isEOF() )
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{
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// read the element text (add the leading opening bracket manually)
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OString aElement = OString( '<' ) + readToElementEnd();
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// check for CDATA part, starting with '<![CDATA['
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if( aElement.match( maOpeningCData ) )
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{
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// search the end tag ']]>'
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while( ((aElement.getLength() < maClosingCData.getLength()) || !aElement.match( maClosingCData, aElement.getLength() - maClosingCData.getLength() )) && !mxTextStrm->isEOF() )
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aElement += readToElementEnd();
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// copy the entire CDATA part
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aBuffer.append( aElement );
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}
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else
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{
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// no CDATA part - process the contents of the element
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lclProcessElement( aBuffer, aElement );
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}
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}
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maBuffer = aBuffer.makeStringAndClear();
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mnBufferPos = 0;
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}
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}
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OString InputStream::readToElementBegin() throw (IOException, RuntimeException)
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{
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return OUStringToOString( mxTextStrm->readString( maOpeningBracket, sal_False ), RTL_TEXTENCODING_ISO_8859_1 );
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}
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OString InputStream::readToElementEnd() throw (IOException, RuntimeException)
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{
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OString aText = OUStringToOString( mxTextStrm->readString( maClosingBracket, sal_False ), RTL_TEXTENCODING_ISO_8859_1 );
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OSL_ENSURE( !aText.isEmpty() && (aText[ aText.getLength() - 1 ] == '>'), "InputStream::readToElementEnd - missing closing bracket of XML element" );
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return aText;
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}
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// ============================================================================
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} // namespace vml
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} // namespave oox
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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