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OpenCms is an enterprise-ready, easy to use website content management system based on Java and XML technology. Offering a complete set of features, OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently.

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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * For further information about Alkacon Software GmbH & Co. KG, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.util;

import org.opencms.test.OpenCmsTestCase;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;

/**
 * @since 6.2.2
 */
public class TestCmsFileUtil extends OpenCmsTestCase {

    /**
     * An input stream that provides 24 bytes of data in two chunks, the first of 16 bytes,
     * the second of 8 bytes.

* * This simulates the behavior of calls to available() and read() on * buffered file or zip input streams, where the size of the underlying data slightly exceeds the size * of the stream's internal buffers.

*/ private static class TestInputStream extends InputStream { private boolean m_closed; private ByteArrayInputStream m_firstChunk; private ByteArrayInputStream m_secondChunk; /** * Input stream implementation that exploits an error with {@link CmsFileUtil#readFully(InputStream)}.

*/ TestInputStream() { byte[] first = new byte[16]; byte[] second = new byte[8]; Arrays.fill(first, (byte)1); Arrays.fill(second, (byte)2); m_firstChunk = new ByteArrayInputStream(first); m_secondChunk = new ByteArrayInputStream(second); } /** * @see java.io.InputStream#available() */ @Override public int available() { if (m_closed) { return 0; } int first = m_firstChunk.available(); return first > 0 ? first : m_secondChunk.available(); } /** * @see java.io.InputStream#close() */ @Override public void close() throws IOException { //mark that close was called for testing purposes. m_closed = true; super.close(); } /** * Returns true if this stream was closed.

* * @return true if this stream was closed */ public boolean isClosed() { return m_closed; } /** * @see java.io.InputStream#read() */ @Override public int read() throws IOException { if (m_closed) { throw new IOException("Stream was closed"); } return m_firstChunk.available() > 0 ? m_firstChunk.read() : m_secondChunk.read(); } /** * @see java.io.InputStream#read(byte[], int, int) */ @Override public int read(byte[] b, int off, int len) throws IOException { if (m_closed) { throw new IOException("Stream was closed"); } int first = m_firstChunk.available(); if (first > 0) { return m_firstChunk.read(b, off, len); } else { return m_secondChunk.read(b, off, len); } } } /** * Test the behavior of {@link CmsFileUtil#readFully(InputStream)} * when the read takes more than one iteration to complete.

* * @throws IOException in case the test fails */ public void testMultiPassReadFully() throws IOException { // this test is written especially to exploit an array bounds bug (bug 1131) // if the first call to available() returns // a value greater than the second call to available(), an IndexOutOfBoundsException is thrown. TestInputStream is = new TestInputStream(); byte[] data = CmsFileUtil.readFully(is); assertNotNull("new byte array returned by readFully", data); // test that all the data from both chunks of the input stream was read correctly. assertEquals("all data returned", 24, data.length); for (int i = 0; i < 16; ++i) { assertEquals("first chunk data[" + i + "] has correct value", 1, data[i]); } for (int i = 16; i < 24; ++i) { assertEquals("second chunk data[" + i + "] has correct value", 2, data[i]); } assertTrue("input stream was closed", is.isClosed()); } }





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