| /* |
| * Copyright (c) 2014 SAP SE. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 8034087 8027359 |
| * @summary XML parser may overwrite element content if that content falls onto the border of an entity scanner buffer |
| * @run main FragmentScannerBufferLimitTest |
| */ |
| import java.io.*; |
| |
| import javax.xml.parsers.*; |
| import javax.xml.transform.*; |
| import org.w3c.dom.*; |
| import org.xml.sax.*; |
| |
| /** |
| * Test for overwriting of XML element content by the XML parser when reading over buffer |
| * limits. |
| * |
| * We create a simple XML document of the form: |
| * |
| * <?xml version=\"1.1\"?> |
| * <ROOT> |
| * <FILLER>ffffffff...fffff</FILLER> |
| * <TEST>content</TEST><TEST2>content2</TEST2> |
| * <FILLER>ffffffff...fffffffff</FILLER> |
| * </ROOT> |
| * |
| * What's important here is, that the test content is at the border of an entity scanner |
| * buffer (XMLEntityScanner uses 8192 byte buffers). That's why there are filler elements |
| * of sufficient length that ensure there is a buffer break inside the test content |
| * and there is enough to read to require another buffer read after the content has been |
| * read. |
| * |
| * With the faulty implementation, the test content gets overwritten with characters |
| * read from the next buffer, i.e. 'f's. |
| * |
| * @author steffen.schreiber@sap.com |
| */ |
| public class FragmentScannerBufferLimitTest { |
| |
| static int errCount = 0; |
| |
| /** |
| * Check the test content. |
| */ |
| public static void main(String[] args) throws ParserConfigurationException, |
| SAXException, IOException, TransformerConfigurationException, |
| TransformerException, TransformerFactoryConfigurationError { |
| |
| String testString = "<TEST>content</TEST><TEST2>content2</TEST2>"; |
| |
| for (int i = 0; i < testString.length(); i++) { |
| test(createDocument(testString.toString(), i), ""+ i); |
| } |
| |
| if (errCount == 0) { |
| System.out.println("OK"); |
| } |
| else { |
| System.out.println("ERROR"); |
| throw new RuntimeException("Parsing error: element content has been overwritten"); |
| } |
| } |
| |
| /** |
| * Create the test XML document. |
| * @param testString the test content string |
| * @param bufferLimitPosition the position in the string where the buffer should break |
| * @return the document |
| */ |
| private static String createDocument(String testString, int bufferLimitPosition) throws UnsupportedEncodingException { |
| StringBuilder result = new StringBuilder(); |
| result.append("<?xml version=\"1.1\"?>"); |
| result.append("<ROOT>"); |
| |
| int fillerLength = 8192 - bufferLimitPosition; |
| createFiller(result, fillerLength); |
| |
| result.append(testString); |
| |
| createFiller(result, 9000); |
| result.append("</ROOT>"); |
| return result.toString(); |
| } |
| |
| /** |
| * Create the filler element of the given length. |
| * @param buffer the output buffer |
| * @param length the required length of the element, including the element tags |
| */ |
| private static void createFiller(StringBuilder buffer, int length) { |
| buffer.append("<FILLER>"); |
| int fillLength = length - "<FILLER></FILLER>".length(); |
| for (int i=0; i<fillLength; i++) { |
| buffer.append('f'); |
| } |
| buffer.append("</FILLER>"); |
| } |
| |
| |
| private static void test(String document, String testName) throws SAXException, IOException, ParserConfigurationException { |
| DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
| DocumentBuilder builder = factory.newDocumentBuilder(); |
| |
| Document doc = builder.parse(new ByteArrayInputStream(document.getBytes("UTF-8"))); |
| |
| // check that there is the root node |
| NodeList roots = doc.getElementsByTagName("ROOT"); |
| assert roots.getLength() == 1; |
| Node root = roots.item(0); |
| |
| // check that root has children "FILLER" and "TEST" |
| NodeList children = root.getChildNodes(); |
| assert children.getLength() == 4; |
| assert children.item(0).getNodeName().equals("FILLER"); |
| assert children.item(1).getNodeName().equals("TEST"); |
| assert children.item(2).getNodeName().equals("TEST2"); |
| assert children.item(3).getNodeName().equals("FILLER"); |
| |
| // check that the test node has content "content" |
| checkContent(children.item(1).getTextContent(), "content", document); |
| checkContent(children.item(2).getTextContent(), "content2", document); |
| } |
| |
| private static void checkContent(String found, String expected, String document) { |
| if (! (found.equals(expected))) { |
| errCount++; |
| int bufferStart = "<?xml version=\"1.1\"?><ROOT>".length() +1; |
| int bufferStart2 = bufferStart + 8192; |
| System.err.println("\nError:: expected \"" + expected |
| + "\", but found \"" + found + "\"!"); |
| System.err.println("Buffer was (probably): [ ... " |
| + document.substring(bufferStart2 - 20, bufferStart2) + "] [" |
| + document.substring(bufferStart2, bufferStart2 + 30) + " ... ]"); |
| } |
| } |
| } |