content/xslt/src/xslt/txUnknownHandler.cpp
author Peter Van der Beken <peterv@propagandism.org>
Thu, 02 Dec 2010 11:12:27 -0500
changeset 58490 40b718853f48f2b12802e6266004bc1ea35d28dd
parent 39101 1995edaefd3f79ca174f28635cbdce3d6db0bbe8
child 58491 feb478675a92f9d46beaeda01795f78440a7a1eb
child 58500 cb06c76f79fbc4d7b882fc672fb6e93551db3a9c
permissions -rw-r--r--
Fix for bug 603844 (Leak txUnknownHandler+ with transformToDocument(textnode)). r=sicking a=b:final

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is TransforMiiX XSLT processor code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Peter Van der Beken <peterv@propagandism.org>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "txUnknownHandler.h"
#include "txExecutionState.h"
#include "txStringUtils.h"
#include "txStylesheet.h"
#include "txAtoms.h"

txUnknownHandler::txUnknownHandler(txExecutionState* aEs)
    : mEs(aEs)
{
}

nsresult
txUnknownHandler::endDocument(nsresult aResult)
{
    if (NS_FAILED(aResult)) {
        return NS_OK;
    }

    // This is an unusual case, no output method has been set and we
    // didn't create a document element. Switching to XML output mode
    // anyway.

    // Make sure that mEs->mResultHandler == this is true, otherwise we'll
    // leak mEs->mResultHandler in createHandlerAndFlush and we'll crash on
    // the last line (delete this).
    NS_ASSERTION(mEs->mResultHandler == this,
                 "We're leaking mEs->mResultHandler and are going to crash.");

    nsresult rv = createHandlerAndFlush(PR_FALSE, EmptyString(),
                                        kNameSpaceID_None);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = mEs->mResultHandler->endDocument(aResult);

    delete this;

    return rv;
}

nsresult
txUnknownHandler::startElement(nsIAtom* aPrefix, nsIAtom* aLocalName,
                               nsIAtom* aLowercaseLocalName, PRInt32 aNsID)
{
    // Make sure that mEs->mResultHandler == this is true, otherwise we'll
    // leak mEs->mResultHandler in createHandlerAndFlush and we may crash
    // later on trying to delete this handler again.
    NS_ASSERTION(mEs->mResultHandler == this,
                 "We're leaking mEs->mResultHandler.");

    nsCOMPtr<nsIAtom> owner;
    if (!aLowercaseLocalName) {
        owner = TX_ToLowerCaseAtom(aLocalName);
        NS_ENSURE_TRUE(owner, NS_ERROR_OUT_OF_MEMORY);
        
        aLowercaseLocalName = owner;
    }

    PRBool htmlRoot = aNsID == kNameSpaceID_None && !aPrefix &&
                      aLowercaseLocalName == txHTMLAtoms::html;

    // Use aLocalName and not aLowercaseLocalName in case the output
    // handler cares about case. For eHTMLOutput the handler will hardcode
    // to 'html' anyway.
    nsresult rv = createHandlerAndFlush(htmlRoot,
                                        nsDependentAtomString(aLocalName),
                                        aNsID);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = mEs->mResultHandler->startElement(aPrefix, aLocalName,
                                           aLowercaseLocalName, aNsID);

    delete this;

    return rv;
}

nsresult
txUnknownHandler::startElement(nsIAtom* aPrefix, const nsSubstring& aLocalName,
                               const PRInt32 aNsID)
{
    // Make sure that mEs->mResultHandler == this is true, otherwise we'll
    // leak mEs->mResultHandler in createHandlerAndFlush and we may crash
    // later on trying to delete this handler again.
    NS_ASSERTION(mEs->mResultHandler == this,
                 "We're leaking mEs->mResultHandler.");

    PRBool htmlRoot = aNsID == kNameSpaceID_None && !aPrefix &&
                      aLocalName.Equals(NS_LITERAL_STRING("html"),
                                        txCaseInsensitiveStringComparator());
    nsresult rv = createHandlerAndFlush(htmlRoot, aLocalName, aNsID);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = mEs->mResultHandler->startElement(aPrefix, aLocalName, aNsID);

    delete this;

    return rv;
}

nsresult txUnknownHandler::createHandlerAndFlush(PRBool aHTMLRoot,
                                                 const nsSubstring& aName,
                                                 const PRInt32 aNsID)
{
    NS_ENSURE_TRUE(mBuffer, NS_ERROR_NOT_INITIALIZED);

    txOutputFormat format;
    format.merge(*(mEs->mStylesheet->getOutputFormat()));
    if (format.mMethod == eMethodNotSet) {
        format.mMethod = aHTMLRoot ? eHTMLOutput : eXMLOutput;
    }

    nsAutoPtr<txAXMLEventHandler> handler;
    nsresult rv = mEs->mOutputHandlerFactory->createHandlerWith(&format, aName,
                                                                aNsID,
                                                                getter_Transfers(handler));
    NS_ENSURE_SUCCESS(rv, rv);

    rv = mBuffer->flushToHandler(handler);
    NS_ENSURE_SUCCESS(rv, rv);

    mEs->mOutputHandler = handler;
    mEs->mResultHandler = handler.forget();

    return NS_OK;
}