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Diffstat (limited to 'oox/source/vml/vmlinputstream.cxx')
| -rw-r--r-- | oox/source/vml/vmlinputstream.cxx | 393 |
1 files changed, 393 insertions, 0 deletions
diff --git a/oox/source/vml/vmlinputstream.cxx b/oox/source/vml/vmlinputstream.cxx new file mode 100644 index 000000000..4f9420761 --- /dev/null +++ b/oox/source/vml/vmlinputstream.cxx @@ -0,0 +1,393 @@ +/* -*- 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 <oox/vml/vmlinputstream.hxx> + +#include <com/sun/star/io/IOException.hpp> +#include <com/sun/star/io/XTextInputStream2.hpp> +#include <map> +#include <string.h> +#include <rtl/strbuf.hxx> +#include <osl/diagnose.h> +#include <oox/helper/textinputstream.hxx> + +namespace oox::vml { + +using namespace ::com::sun::star::io; +using namespace ::com::sun::star::uno; + +namespace { + +const char* lclFindCharacter( const char* pcBeg, const char* pcEnd, char cChar ) +{ + sal_Int32 nIndex = rtl_str_indexOfChar_WithLength( pcBeg, static_cast< sal_Int32 >( pcEnd - pcBeg ), cChar ); + return (nIndex < 0) ? pcEnd : (pcBeg + nIndex); +} + +bool lclIsWhiteSpace( char cChar ) +{ + return cChar >= 0 && cChar <= 32; +} + +const char* lclFindWhiteSpace( const char* pcBeg, const char* pcEnd ) +{ + for( ; pcBeg < pcEnd; ++pcBeg ) + if( lclIsWhiteSpace( *pcBeg ) ) + return pcBeg; + return pcEnd; +} + +const char* lclFindNonWhiteSpace( const char* pcBeg, const char* pcEnd ) +{ + for( ; pcBeg < pcEnd; ++pcBeg ) + if( !lclIsWhiteSpace( *pcBeg ) ) + return pcBeg; + return pcEnd; +} + +const char* lclTrimWhiteSpaceFromEnd( const char* pcBeg, const char* pcEnd ) +{ + while( (pcBeg < pcEnd) && lclIsWhiteSpace( pcEnd[ -1 ] ) ) + --pcEnd; + return pcEnd; +} + +void lclAppendToBuffer( OStringBuffer& rBuffer, const char* pcBeg, const char* pcEnd ) +{ + rBuffer.append( pcBeg, static_cast< sal_Int32 >( pcEnd - pcBeg ) ); +} + +void lclProcessAttribs( OStringBuffer& rBuffer, const char* pcBeg, const char* pcEnd ) +{ + /* Map attribute names to char-pointer of all attributes. This map is used + to find multiple occurrences of attributes with the same name. The + mapped pointers are used as map key in the next map below. */ + typedef ::std::map< OString, const char* > AttributeNameMap; + AttributeNameMap aAttributeNames; + + /* Map the char-pointers of all attributes to the full attribute definition + string. This preserves the original order of the used attributes. */ + typedef ::std::map< const char*, OString > AttributeDataMap; + AttributeDataMap aAttributes; + + bool bOk = true; + const char* pcNameBeg = pcBeg; + while( bOk && (pcNameBeg < pcEnd) ) + { + // pcNameBeg points to begin of attribute name, find equality sign + const char* pcEqualSign = lclFindCharacter( pcNameBeg, pcEnd, '=' ); + bOk = (pcEqualSign < pcEnd); + if (bOk) + { + // find end of attribute name (ignore whitespace between name and equality sign) + const char* pcNameEnd = lclTrimWhiteSpaceFromEnd( pcNameBeg, pcEqualSign ); + bOk = (pcNameBeg < pcNameEnd); + if( bOk ) + { + // find begin of attribute value (must be single or double quote) + const char* pcValueBeg = lclFindNonWhiteSpace( pcEqualSign + 1, pcEnd ); + bOk = (pcValueBeg < pcEnd) && ((*pcValueBeg == '\'') || (*pcValueBeg == '"')); + if( bOk ) + { + // find end of attribute value (matching quote character) + const char* pcValueEnd = lclFindCharacter( pcValueBeg + 1, pcEnd, *pcValueBeg ); + bOk = (pcValueEnd < pcEnd); + if( bOk ) + { + ++pcValueEnd; + OString aAttribName( pcNameBeg, static_cast< sal_Int32 >( pcNameEnd - pcNameBeg ) ); + OString aAttribData( pcNameBeg, static_cast< sal_Int32 >( pcValueEnd - pcNameBeg ) ); + // search for an existing attribute with the same name + AttributeNameMap::iterator aIt = aAttributeNames.find( aAttribName ); + // remove its definition from the data map + if( aIt != aAttributeNames.end() ) + aAttributes.erase( aIt->second ); + // insert the attribute into both maps + aAttributeNames[ aAttribName ] = pcNameBeg; + aAttributes[ pcNameBeg ] = aAttribData; + // continue with next attribute (skip whitespace after this attribute) + pcNameBeg = pcValueEnd; + if( pcNameBeg < pcEnd ) + { + bOk = lclIsWhiteSpace( *pcNameBeg ); + if( bOk ) + pcNameBeg = lclFindNonWhiteSpace( pcNameBeg + 1, pcEnd ); + } + } + } + } + } + } + + // if no error has occurred, build the resulting attribute list + if( bOk ) + for (auto const& attrib : aAttributes) + rBuffer.append( ' ' ).append( attrib.second ); + // on error, just append the complete passed string + else + lclAppendToBuffer( rBuffer, pcBeg, pcEnd ); +} + +void lclProcessElement( OStringBuffer& rBuffer, const OString& rElement ) +{ + // check that passed string starts and ends with the brackets of an XML element + sal_Int32 nElementLen = rElement.getLength(); + if( nElementLen == 0 ) + return; + + const char* pcOpen = rElement.getStr(); + const char* pcClose = pcOpen + nElementLen - 1; + + // no complete element found + if( (pcOpen >= pcClose) || (*pcOpen != '<') || (*pcClose != '>') ) + { + // just append all passed characters + rBuffer.append( rElement ); + } + + // skip parser instructions: '<![...]>' + else if( (nElementLen >= 5) && (pcOpen[ 1 ] == '!') && (pcOpen[ 2 ] == '[') && (pcClose[ -1 ] == ']') ) + { + // do nothing + } + + // just append any xml prolog (text directive) or processing instructions: <?...?> + else if( (nElementLen >= 4) && (pcOpen[ 1 ] == '?') && (pcClose[ -1 ] == '?') ) + { + rBuffer.append( rElement ); + } + + // replace '<br>' element with newline + else if( (nElementLen >= 4) && (pcOpen[ 1 ] == 'b') && (pcOpen[ 2 ] == 'r') && (lclFindNonWhiteSpace( pcOpen + 3, pcClose ) == pcClose) ) + { + rBuffer.append( '\n' ); + } + + // check start elements and simple elements for repeated attributes + else if( pcOpen[ 1 ] != '/' ) + { + // find positions of text content inside brackets, exclude '/' in '<simpleelement/>' + const char* pcContentBeg = pcOpen + 1; + bool bIsEmptyElement = pcClose[ -1 ] == '/'; + const char* pcContentEnd = bIsEmptyElement ? (pcClose - 1) : pcClose; + // append opening bracket and element name to buffer + const char* pcWhiteSpace = lclFindWhiteSpace( pcContentBeg, pcContentEnd ); + lclAppendToBuffer( rBuffer, pcOpen, pcWhiteSpace ); + // find begin of attributes, and process all attributes + const char* pcAttribBeg = lclFindNonWhiteSpace( pcWhiteSpace, pcContentEnd ); + if( pcAttribBeg < pcContentEnd ) + lclProcessAttribs( rBuffer, pcAttribBeg, pcContentEnd ); + // close the element + if( bIsEmptyElement ) + rBuffer.append( '/' ); + rBuffer.append( '>' ); + } + + // append end elements without further processing + else + { + rBuffer.append( rElement ); + } +} + +bool lclProcessCharacters( OStringBuffer& rBuffer, const OString& rChars ) +{ + /* MSO has a very weird way to store and handle whitespaces. The stream + may contain lots of spaces, tabs, and newlines which have to be handled + as single space character. This will be done in this function. + + If the element text contains a literal line break, it will be stored as + <br> tag (without matching </br> element). This input stream wrapper + will replace this element with a literal LF character (see below). + + A single space character for its own is stored as is. Example: The + element + <font> </font> + represents a single space character. The XML parser will ignore this + space character completely without issuing a 'characters' event. The + VML import filter implementation has to react on this case manually. + + A single space character following another character is stored + literally and must not be stripped away here. Example: The element + <font>abc </font> + contains the three letters a, b, and c, followed by a space character. + + Consecutive space characters, or a leading single space character, are + stored in a <span> element. If there are N space characters (N > 1), + then the <span> element contains exactly (N-1) NBSP (non-breaking + space) characters, followed by a regular space character. Examples: + The element + <font><span style='mso-spacerun:yes'>\xA0\xA0\xA0 </span></font> + represents 4 consecutive space characters. Has to be handled by the + implementation. The element + <font><span style='mso-spacerun:yes'> abc</span></font> + represents a space characters followed by the letters a, b, c. These + strings have to be handled by the VML import filter implementation. + */ + + // passed string ends with the leading opening bracket of an XML element + const char* pcBeg = rChars.getStr(); + const char* pcEnd = pcBeg + rChars.getLength(); + bool bHasBracket = (pcBeg < pcEnd) && (pcEnd[ -1 ] == '<'); + if( bHasBracket ) --pcEnd; + + // skip leading whitespace + const char* pcContentsBeg = lclFindNonWhiteSpace( pcBeg, pcEnd ); + while( pcContentsBeg < pcEnd ) + { + const char* pcWhitespaceBeg = lclFindWhiteSpace( pcContentsBeg + 1, pcEnd ); + lclAppendToBuffer( rBuffer, pcContentsBeg, pcWhitespaceBeg ); + if( pcWhitespaceBeg < pcEnd ) + rBuffer.append( ' ' ); + pcContentsBeg = lclFindNonWhiteSpace( pcWhitespaceBeg, pcEnd ); + } + + return bHasBracket; +} + +} // namespace + +constexpr OStringLiteral gaOpeningCData( "<![CDATA[" ); +constexpr OStringLiteral gaClosingCData( "]]>" ); + +InputStream::InputStream( const Reference< XComponentContext >& rxContext, const Reference< XInputStream >& rxInStrm ) : + // use single-byte ISO-8859-1 encoding which maps all byte characters to the first 256 Unicode characters + mxTextStrm( TextInputStream::createXTextInputStream( rxContext, rxInStrm, RTL_TEXTENCODING_ISO_8859_1 ) ), + maOpeningBracket{ '<' }, + maClosingBracket{ '>' }, + mnBufferPos( 0 ) +{ + if (!mxTextStrm.is()) + throw IOException(); +} + +InputStream::~InputStream() +{ +} + +sal_Int32 SAL_CALL InputStream::readBytes( Sequence< sal_Int8 >& rData, sal_Int32 nBytesToRead ) +{ + if( nBytesToRead < 0 ) + throw IOException(); + + rData.realloc( nBytesToRead ); + sal_Int8* pcDest = rData.getArray(); + sal_Int32 nRet = 0; + while( (nBytesToRead > 0) && !mxTextStrm->isEOF() ) + { + updateBuffer(); + sal_Int32 nReadSize = ::std::min( nBytesToRead, maBuffer.getLength() - mnBufferPos ); + if( nReadSize > 0 ) + { + memcpy( pcDest + nRet, maBuffer.getStr() + mnBufferPos, static_cast< size_t >( nReadSize ) ); + mnBufferPos += nReadSize; + nBytesToRead -= nReadSize; + nRet += nReadSize; + } + } + if( nRet < rData.getLength() ) + rData.realloc( nRet ); + return nRet; +} + +sal_Int32 SAL_CALL InputStream::readSomeBytes( Sequence< sal_Int8 >& rData, sal_Int32 nMaxBytesToRead ) +{ + return readBytes( rData, nMaxBytesToRead ); +} + +void SAL_CALL InputStream::skipBytes( sal_Int32 nBytesToSkip ) +{ + if( nBytesToSkip < 0 ) + throw IOException(); + + while( (nBytesToSkip > 0) && !mxTextStrm->isEOF() ) + { + updateBuffer(); + sal_Int32 nSkipSize = ::std::min( nBytesToSkip, maBuffer.getLength() - mnBufferPos ); + mnBufferPos += nSkipSize; + nBytesToSkip -= nSkipSize; + } +} + +sal_Int32 SAL_CALL InputStream::available() +{ + updateBuffer(); + return maBuffer.getLength() - mnBufferPos; +} + +void SAL_CALL InputStream::closeInput() +{ + mxTextStrm->closeInput(); +} + +// private -------------------------------------------------------------------- + +void InputStream::updateBuffer() +{ + while( (mnBufferPos >= maBuffer.getLength()) && !mxTextStrm->isEOF() ) + { + // collect new contents in a string buffer + OStringBuffer aBuffer; + + // read and process characters until the opening bracket of the next XML element + OString aChars = readToElementBegin(); + bool bHasOpeningBracket = lclProcessCharacters( aBuffer, aChars ); + + // read and process characters until (and including) closing bracket (an XML element) + OSL_ENSURE( bHasOpeningBracket || mxTextStrm->isEOF(), "InputStream::updateBuffer - missing opening bracket of XML element" ); + if( bHasOpeningBracket && !mxTextStrm->isEOF() ) + { + // read the element text (add the leading opening bracket manually) + OString aElement = "<" + readToElementEnd(); + // check for CDATA part, starting with '<![CDATA[' + if( aElement.match( gaOpeningCData ) ) + { + // search the end tag ']]>' + while( ((aElement.getLength() < gaClosingCData.getLength()) || !aElement.endsWith( gaClosingCData )) && !mxTextStrm->isEOF() ) + aElement += readToElementEnd(); + // copy the entire CDATA part + aBuffer.append( aElement ); + } + else + { + // no CDATA part - process the contents of the element + lclProcessElement( aBuffer, aElement ); + } + } + + maBuffer = aBuffer.makeStringAndClear(); + mnBufferPos = 0; + } +} + +OString InputStream::readToElementBegin() +{ + return OUStringToOString( mxTextStrm->readString( maOpeningBracket, false ), RTL_TEXTENCODING_ISO_8859_1 ); +} + +OString InputStream::readToElementEnd() +{ + OString aText = OUStringToOString( mxTextStrm->readString( maClosingBracket, false ), RTL_TEXTENCODING_ISO_8859_1 ); + OSL_ENSURE( aText.endsWith(">"), "InputStream::readToElementEnd - missing closing bracket of XML element" ); + return aText; +} + +} // namespace oox::vml + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |