IGXMLScanner2.cpp

                {
                    // Its trailing, so make sure we were expecting it
                    if (!gotLeadingSurrogate)
                        emitError(XMLErrs::Unexpected2ndSurrogateChar);
                }
                else
                {
                    //  Its just a char, so make sure we were not expecting a
                    //  trailing surrogate.
                    if (gotLeadingSurrogate)
                        emitError(XMLErrs::Expected2ndSurrogateChar);

                    // Its got to at least be a valid XML character
                    else if (!fReaderMgr.getCurrentReader()->isXMLChar(nextCh))
                    {
                        XMLCh tmpBuf[9];
                        XMLString::binToText
                        (
                            nextCh
                            , tmpBuf
                            , 8
                            , 16
                        );
                        emitError(XMLErrs::InvalidCharacter, tmpBuf);
                        emittedError = true;
                    }
                }
                gotLeadingSurrogate = false;
            }
        }

        if (fValidate) {
            // And see if the current element is a 'Children' style content model
            const ElemStack::StackElem* topElem = fElemStack.topElement();

            // Get the character data opts for the current element
            XMLElementDecl::CharDataOpts charOpts = topElem->fThisElement->getCharDataOpts();

            if (charOpts != XMLElementDecl::AllCharData)
            {
                // They definitely cannot handle any type of char data
                fValidator->emitError(XMLValid::NoCharDataInCM);
            }
        }

        // Add it to the buffer
        bbCData.append(nextCh);
    }
}


void IGXMLScanner::scanCharData(XMLBuffer& toUse)
{
    //  We have to watch for the stupid ]]> sequence, which is illegal in
    //  character data. So this is a little state machine that handles that.
    enum States
    {
        State_Waiting
        , State_GotOne
        , State_GotTwo
    };

    // Reset the buffer before we start
    toUse.reset();

    // Turn on the 'throw at end' flag of the reader manager
    ThrowEOEJanitor jan(&fReaderMgr, true);

    //  In order to be more efficient we have to use kind of a deeply nested
    //  set of blocks here. The outer block puts on a try and catches end of
    //  entity exceptions. The inner loop is the per-character loop. If we
    //  put the try inside the inner loop, it would work but would require
    //  the exception handling code setup/teardown code to be invoked for
    //  each character.
    XMLCh   nextCh;
    XMLCh   secondCh = 0;
    States  curState = State_Waiting;
    bool    escaped = false;
    bool    gotLeadingSurrogate = false;
    bool    notDone = true;
    while (notDone)
    {
        try
        {
            while (true)
            {
                //  Eat through as many plain content characters as possible without
                //  needing special handling.  Moving most content characters here,
                //  in this one call, rather than running the overall loop once
                //  per content character, is a speed optimization.
                if (curState == State_Waiting  &&  !gotLeadingSurrogate)
                {
                     fReaderMgr.movePlainContentChars(toUse);
                }

                // Try to get another char from the source
                //   The code from here on down covers all contengencies,
                if (!fReaderMgr.getNextCharIfNot(chOpenAngle, nextCh))
                {
                    // If we were waiting for a trailing surrogate, its an error
                    if (gotLeadingSurrogate)
                        emitError(XMLErrs::Expected2ndSurrogateChar);

                    notDone = false;
                    break;
                }

                //  Watch for a reference. Note that the escapement mechanism
                //  is ignored in this content.
                escaped = false;
                if (nextCh == chAmpersand)
                {
                    sendCharData(toUse);

                    // Turn off the throwing at the end of entity during this
                    ThrowEOEJanitor jan(&fReaderMgr, false);

                    if (scanEntityRef(false, nextCh, secondCh, escaped) != EntityExp_Returned)
                    {
                        gotLeadingSurrogate = false;
                        continue;
                    }
                }
                else if ((nextCh >= 0xD800) && (nextCh <= 0xDBFF))
                {
                    // Deal with surrogate pairs
                    //  Its a leading surrogate. If we already got one, then
                    //  issue an error, else set leading flag to make sure that
                    //  we look for a trailing next time.
                    if (gotLeadingSurrogate)
                        emitError(XMLErrs::Expected2ndSurrogateChar);
                    else
                        gotLeadingSurrogate = true;
                }
                else
                {
                    //  If its a trailing surrogate, make sure that we are
                    //  prepared for that. Else, its just a regular char so make
                    //  sure that we were not expected a trailing surrogate.
                    if ((nextCh >= 0xDC00) && (nextCh <= 0xDFFF))
                    {
                        // Its trailing, so make sure we were expecting it
                        if (!gotLeadingSurrogate)
                            emitError(XMLErrs::Unexpected2ndSurrogateChar);
                    }
                    else
                    {
                        //  Its just a char, so make sure we were not expecting a
                        //  trailing surrogate.
                        if (gotLeadingSurrogate)
                            emitError(XMLErrs::Expected2ndSurrogateChar);

                        // Make sure the returned char is a valid XML char
                        if (!fReaderMgr.getCurrentReader()->isXMLChar(nextCh))
                        {
                            XMLCh tmpBuf[9];
                            XMLString::binToText
                            (
                                nextCh
                                , tmpBuf
                                , 8
                                , 16
                            );
                            emitError(XMLErrs::InvalidCharacter, tmpBuf);
                        }
                    }
                    gotLeadingSurrogate = false;
                }

                 // Keep the state machine up to date
                if (!escaped)
                {
                    if (nextCh == chCloseSquare)
                    {
                        if (curState == State_Waiting)
                            curState = State_GotOne;
                        else if (curState == State_GotOne)
                            curState = State_GotTwo;
                    }
                    else if (nextCh == chCloseAngle)
                    {
                        if (curState == State_GotTwo)
                            emitError(XMLErrs::BadSequenceInCharData);
                        curState = State_Waiting;
                    }
                    else
                    {
                        curState = State_Waiting;
                    }
                }
                else
                {
                    curState = State_Waiting;
                }

                // Add this char to the buffer
                toUse.append(nextCh);

                if (secondCh)
                    toUse.append(secondCh);
            }
        }
        catch(const EndOfEntityException& toCatch)
        {
            //  Some entity ended, so we have to send any accumulated
            //  chars and send an end of entity event.
            sendCharData(toUse);
            gotLeadingSurrogate = false;

            if (fDocHandler)
                fDocHandler->endEntityReference(toCatch.getEntity());
        }
    }

    // Check the validity constraints as per XML 1.0 Section 2.9
    if (fValidate && fStandalone)
    {
        // See if the text contains whitespace
        // Get the raw data we need for the callback
        const XMLCh* rawBuf = toUse.getRawBuffer();
        const unsigned int len = toUse.getLen();
        const bool isSpaces = fReaderMgr.getCurrentReader()->containsWhiteSpace(rawBuf, len);

        if (isSpaces)
        {
            // And see if the current element is a 'Children' style content model
            const ElemStack::StackElem* topElem = fElemStack.topElement();

            if (topElem->fThisElement->isExternal()) {

                // Get the character data opts for the current element
                XMLElementDecl::CharDataOpts charOpts =  topElem->fThisElement->getCharDataOpts();

                if (charOpts == XMLElementDecl::SpacesOk)  // => Element Content
                {
                    // Error - standalone should have a value of "no" as whitespace detected in an
                    // element type with element content whose element declaration was external
                    //
                    fValidator->emitError(XMLValid::NoWSForStandalone);
                }
            }
        }
    }
    // Send any char data that we accumulated into the buffer
    sendCharData(toUse);
}


//  This method will scan a general/character entity ref. It will either
//  expand a char ref and return it directly, or push a reader for a general
//  entity.
//
//  The return value indicates whether the char parameters hold the value
//  or whether the value was pushed as a reader, or that it failed.
//
//  The escaped flag tells the caller whether the returned parameter resulted
//  from a character reference, which escapes the character in some cases. It
//  only makes any difference if the return value indicates the value was
//  returned directly.
IGXMLScanner::EntityExpRes
IGXMLScanner::scanEntityRef(  const   bool    inAttVal
                            ,       XMLCh&  firstCh
                            ,       XMLCh&  secondCh
                            ,       bool&   escaped)
{
    // Assume no escape
    secondCh = 0;
    escaped = false;

    // We have to insure that its all in one entity
    const unsigned int curReader = fReaderMgr.getCurrentReaderNum();

    //  If the next char is a pound, then its a character reference and we
    //  need to expand it always.
    if (fReaderMgr.skippedChar(chPound))
    {
        //  Its a character reference, so scan it and get back the numeric
        //  value it represents.
        if (!scanCharRef(firstCh, secondCh))
            return EntityExp_Failed;

        escaped = true;

        if (curReader != fReaderMgr.getCurrentReaderNum())
            emitError(XMLErrs::PartialMarkupInEntity);

        return EntityExp_Returned;
    }

    // Expand it since its a normal entity ref
    XMLBufBid bbName(&fBufMgr);
    if (!fReaderMgr.getName(bbName.getBuffer()))
    {
        emitError(XMLErrs::ExpectedEntityRefName);
        return EntityExp_Failed;
    }

    //  Next char must be a semi-colon. But if its not, just emit
    //  an error and try to continue.
    if (!fReaderMgr.skippedChar(chSemiColon))
        emitError(XMLErrs::UnterminatedEntityRef, bbName.getRawBuffer());

    // Make sure we ended up on the same entity reader as the & char
    if (curReader != fReaderMgr.getCurrentReaderNum())
        emitError(XMLErrs::PartialMarkupInEntity);

    // Look up the name in the general entity pool
    XMLEntityDecl* decl = fDTDGrammar->getEntityDecl(bbName.getRawBuffer());

    // If it does not exist, then obviously an error
    if (!decl)
    {
        // XML 1.0 Section 4.1
        // Well-formedness Constraint for entity not found:
        //   In a document without any DTD, a document with only an internal DTD subset which contains no parameter entity references,
        //      or a document with "standalone='yes'", for an entity reference that does not occur within the external subset
        //      or a parameter entity
        //
        // Else it's Validity Constraint
        if (fStandalone || fHasNoDTD)
            emitError(XMLErrs::EntityNotFound, bbName.getRawBuffer());
        else {
            if (fValidate)
                fValidator->emitError(XMLValid::VC_EntityNotFound, bbName.getRawBuffer());
        }

        return EntityExp_Failed;
    }

    // XML 1.0 Section 4.1
    //  If we are a standalone document, then it has to have been declared
    //  in the internal subset.
    if (fStandalone && !decl->getDeclaredInIntSubset())
        emitError(XMLErrs::IllegalRefInStandalone, bbName.getRawBuffer());

    if (decl->isExternal())
    {
        // If its unparsed, then its not valid here
        if (decl->isUnparsed())
        {
            emitError(XMLErrs::NoUnparsedEntityRefs, bbName.getRawBuffer());
            return EntityExp_Failed;
        }

        // If we are in an attribute value, then not valid but keep going
        if (inAttVal)
            emitError(XMLErrs::NoExtRefsInAttValue);

        // And now create a reader to read this entity
        InputSource* srcUsed;
        XMLReader* reader = fReaderMgr.createReader
        (
            decl->getBaseURI()
            , decl->getSystemId()
            , decl->getPublicId()
            , false
            , XMLReader::RefFrom_NonLiteral
            , XMLReader::Type_General
            , XMLReader::Source_External
            , srcUsed
            , fCalculateSrcOfs
        );

        // Put a janitor on the source so it gets cleaned up on exit
        Janitor<InputSource> janSrc(srcUsed);

        //  If the creation failed, and its not because the source was empty,
        //  then emit an error and return.
        if (!reader)
            ThrowXML1(RuntimeException, XMLExcepts::Gen_CouldNotOpenExtEntity, srcUsed->getSystemId());

        //  Push the reader. If its a recursive expansion, then emit an error
        //  and return an failure.
        if (!fReaderMgr.pushReader(reader, decl))
        {
            emitError(XMLErrs::RecursiveEntity, decl->getName());
            return EntityExp_Failed;
        }

        //  Do a start entity reference event.
        //
        //  <TBD> For now, we supress them in att values. Later, when
        //  the stuff is in place to correctly allow DOM to handle them
        //  we'll turn this back on.
        if (fDocHandler && !inAttVal)
            fDocHandler->startEntityReference(*decl);

        // If it starts with the XML string, then parse a text decl
        if (checkXMLDecl(true))
            scanXMLDecl(Decl_Text);
    }
    else
    {
        //  If its one of the special char references, then we can return
        //  it as a character, and its considered escaped.
        if (decl->getIsSpecialChar())
        {
            firstCh = decl->getValue()[0];
            escaped = true;
            return EntityExp_Returned;
        }

        //  Create a reader over a memory stream over the entity value
        //  We force it to assume UTF-16 by passing in an encoding
        //  string. This way it won't both trying to predecode the
        //  first line, looking for an XML/TextDecl.
        XMLReader* valueReader = fReaderMgr.createIntEntReader
        (
            decl->getName()
            , XMLReader::RefFrom_NonLiteral
            , XMLReader::Type_General
            , decl->getValue()
            , decl->getValueLen()
            , false
        );

        //  Try to push the entity reader onto the reader manager stack,
        //  where it will become the subsequent input. If it fails, that
        //  means the entity is recursive, so issue an error. The reader
        //  will have just been discarded, but we just keep going.
        if (!fReaderMgr.pushReader(valueReader, decl))
            emitError(XMLErrs::RecursiveEntity, decl->getName());

        //  Do a start entity reference event.
        //
        //  <TBD> For now, we supress them in att values. Later, when
        //  the stuff is in place to correctly allow DOM to handle them
        //  we'll turn this back on.
        if (fDocHandler && !inAttVal)
            fDocHandler->startEntityReference(*decl);

        // If it starts with the XML string, then it's an error
        if (checkXMLDecl(true)) {
            emitError(XMLErrs::TextDeclNotLegalHere);
            fReaderMgr.skipPastChar(chCloseAngle);
        }
    }
    return EntityExp_Pushed;
}


bool IGXMLScanner::switchGrammar(const XMLCh* const newGrammarNameSpace)
{
    Grammar* tempGrammar = fGrammarResolver->getGrammar(newGrammarNameSpace);

    if (!tempGrammar) {
        // This is a case where namespaces is on with a DTD grammar.
        tempGrammar = fDTDGrammar;
    }
    if (!tempGrammar)
        return false;
    else {
        fGrammar = tempGrammar;
        fGrammarType = fGrammar->getGrammarType();
        if (fGrammarType == Grammar::SchemaGrammarType && !fValidator->handlesSchema()) {
            if (fValidatorFromUser)
                ThrowXML(RuntimeException, XMLExcepts::Gen_NoSchemaValidator);
            else {
                fValidator = fSchemaValidator;
            }
        }
        else if (fGrammarType == Grammar::DTDGrammarType && !fValidator->handlesDTD()) {
            if (fValidatorFromUser)
                ThrowXML(RuntimeException, XMLExcepts::Gen_NoDTDValidator);
            else {
                fValidator = fDTDValidator;
            }
        }

        fValidator->setGrammar(fGrammar);
        return true;
    }
}

// check if we should skip or lax the validation of the element
// if skip - no validation
// if lax - validate only if the element if found
bool IGXMLScanner::laxElementValidation(QName* element, ContentLeafNameTypeVector* cv,
                                        const XMLContentModel* const cm,
                                        const unsigned int parentElemDepth)
{
    bool skipThisOne = false;
    bool laxThisOne = false;
    unsigned int elementURI = element->getURI();
    unsigned int currState = fElemState[parentElemDepth];

    if (currState == XMLContentModel::gInvalidTrans) {
        return laxThisOne;
    }

    SubstitutionGroupComparator comparator(fGrammarResolver, fURIStringPool);

    if (cv) {
        unsigned int i = 0;
        unsigned int leafCount = cv->getLeafCount();

        for (; i < leafCount; i++) {

            QName* fElemMap = cv->getLeafNameAt(i);
            unsigned int uri = fElemMap->getURI();
            unsigned int nextState;
            bool anyEncountered = false;
            ContentSpecNode::NodeTypes type = cv->getLeafTypeAt(i);

            if (type == ContentSpecNode::Leaf) {
                if (((uri == elementURI)
                      && XMLString::equals(fElemMap->getLocalPart(), element->getLocalPart()))
                    || comparator.isEquivalentTo(element, fElemMap)) {

                    nextState = cm->getNextState(currState, i);

                    if (nextState != XMLContentModel::gInvalidTrans) {
                        fElemState[parentElemDepth] = nextState;
                        break;
                    }
                }
            } else if ((type & 0x0f) == ContentSpecNode::Any) {
                anyEncountered = true;
            }
            else if ((type & 0x0f) == ContentSpecNode::Any_Other) {
                if (uri != elementURI) {
                    anyEncountered = true;
                }
            }
            else if ((type & 0x0f) == ContentSpecNode::Any_NS) {
                if (uri == elementURI) {
                    anyEncountered = true;
                }
            }

            if (anyEncountered) {

                nextState = cm->getNextState(currState, i);
                if (nextState != XMLContentModel::gInvalidTrans) {
                    fElemState[parentElemDepth] = nextState;

                    if (type == ContentSpecNode::Any_Skip ||
                        type == ContentSpecNode::Any_NS_Skip ||
                        type == ContentSpecNode::Any_Other_Skip) {
                        skipThisOne = true;
                    }
                    else if (type == ContentSpecNode::Any_Lax ||
                             type == ContentSpecNode::Any_NS_Lax ||
                             type == ContentSpecNode::Any_Other_Lax) {
                        laxThisOne = true;
                    }

                    break;
                }
            }
        } // for

        if (i == leafCount) { // no match
            fElemState[parentElemDepth] = XMLContentModel::gInvalidTrans;
            return laxThisOne;
        }

    } // if

    if (skipThisOne) {
        fValidate = false;
        fElemStack.setValidationFlag(fValidate);
    }

    return laxThisOne;
}


// check if there is an AnyAttribute, and if so, see if we should lax or skip
// if skip - no validation
// if lax - validate only if the attribute if found
bool IGXMLScanner::anyAttributeValidation(SchemaAttDef* attWildCard, unsigned int uriId, bool& skipThisOne, bool& laxThisOne)
{
    XMLAttDef::AttTypes wildCardType = attWildCard->getType();
    bool anyEncountered = false;
    skipThisOne = false;
    laxThisOne = false;
    if (wildCardType == XMLAttDef::Any_Any)
        anyEncountered = true;
    else if (wildCardType == XMLAttDef::Any_Other) {
        if (attWildCard->getAttName()->getURI() != uriId)
            anyEncountered = true;
    }
    else if (wildCardType == XMLAttDef::Any_List) {
        ValueVectorOf<unsigned int>* nameURIList = attWildCard->getNamespaceList();
        unsigned int listSize = (nameURIList) ? nameURIList->size() : 0;

        if (listSize) {
            for (unsigned int i=0; i < listSize; i++) {
                if (nameURIList->elementAt(i) == uriId)
                    anyEncountered = true;
            }
        }
    }

    if (anyEncountered) {
        XMLAttDef::DefAttTypes   defType   = attWildCard->getDefaultType();
        if (defType == XMLAttDef::ProcessContents_Skip) {
            // attribute should just be bypassed,
            skipThisOne = true;
        }
        else if (defType == XMLAttDef::ProcessContents_Lax) {
            laxThisOne = true;
        }
    }

    return anyEncountered;
}

void IGXMLScanner::normalizeURI(const XMLCh* const systemURI,
                                XMLBuffer& normalizedURI)
{
    const XMLCh* pszSrc = systemURI;

    normalizedURI.reset();

    while (*pszSrc) {

        if ((*(pszSrc) == chPercent)
        &&  (*(pszSrc+1) == chDigit_2)
        &&  (*(pszSrc+2) == chDigit_0))
        {
            pszSrc += 3;
            normalizedURI.append(chSpace);
        }
        else if (*pszSrc == 0xFFFF) { //escaped character
            pszSrc++;
        }
        else {
            normalizedURI.append(*pszSrc);
            pszSrc++;
        }
    }
}

XERCES_CPP_NAMESPACE_END