poi/src/testcases/org/apache/poi/poifs/filesystem/TestPOIFSFileSystem.java

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.poi.poifs.filesystem;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import junit.framework.TestCase;

import org.apache.poi.POIDataSamples;
import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.poifs.common.POIFSBigBlockSize;
import org.apache.poi.poifs.storage.HeaderBlockReader;
import org.apache.poi.poifs.storage.RawDataBlockList;

/**
 * Tests for POIFSFileSystem
 *
 * @author Josh Micich
 */
public final class TestPOIFSFileSystem extends TestCase {

	/**
	 * Mock exception used to ensure correct error handling
	 */
	private static final class MyEx extends RuntimeException {
		public MyEx() {
			// no fields to initialise
		}
	}
	/**
	 * Helps facilitate testing. Keeps track of whether close() was called.
	 * Also can throw an exception at a specific point in the stream.
	 */
	private static final class TestIS extends InputStream {

		private final InputStream _is;
		private final int _failIndex;
		private int _currentIx;
		private boolean _isClosed;

		public TestIS(InputStream is, int failIndex) {
			_is = is;
			_failIndex = failIndex;
			_currentIx = 0;
			_isClosed = false;
		}

		public int read() throws IOException {
			int result = _is.read();
			if(result >=0) {
				checkRead(1);
			}
			return result;
		}
		public int read(byte[] b, int off, int len) throws IOException {
			int result = _is.read(b, off, len);
			checkRead(result);
			return result;
		}

		private void checkRead(int nBytes) {
			_currentIx += nBytes;
			if(_failIndex > 0 && _currentIx > _failIndex) {
				throw new MyEx();
			}
		}
		public void close() throws IOException {
			_isClosed = true;
			_is.close();
		}
		public boolean isClosed() {
			return _isClosed;
		}
	}

	/**
	 * Test for undesired behaviour observable as of svn revision 618865 (5-Feb-2008).
	 * POIFSFileSystem was not closing the input stream.
	 */
	public void testAlwaysClose() {

		TestIS testIS;

		// Normal case - read until EOF and close
		testIS = new TestIS(openSampleStream("13224.xls"), -1);
		try {
			new POIFSFileSystem(testIS);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
		assertTrue("input stream was not closed", testIS.isClosed());

		// intended to crash after reading 10000 bytes
		testIS = new TestIS(openSampleStream("13224.xls"), 10000);
		try {
			new POIFSFileSystem(testIS);
			fail("ex should have been thrown");
		} catch (IOException e) {
			throw new RuntimeException(e);
		} catch (MyEx e) {
			// expected
		}
		assertTrue("input stream was not closed", testIS.isClosed()); // but still should close
	}

	/**
	 * Test for bug # 48898 - problem opening an OLE2
	 *  file where the last block is short (i.e. not a full
	 *  multiple of 512 bytes)
	 *
	 * As yet, this problem remains. One school of thought is
	 *  not not issue an EOF when we discover the last block
	 *  is short, but this seems a bit wrong.
	 * The other is to fix the handling of the last block in
	 *  POIFS, since it seems to be slight wrong
	 */
	public void testShortLastBlock() throws Exception {
		String[] files = new String[] {
			"ShortLastBlock.qwp", "ShortLastBlock.wps"
		};

		POIDataSamples _samples = POIDataSamples.getPOIFSInstance();
		for(int i=0; i<files.length; i++) {

			// Open the file up
			POIFSFileSystem fs = new POIFSFileSystem(
			    _samples.openResourceAsStream(files[i])
			);

			// Write it into a temp output array
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			fs.writeFilesystem(baos);

			// Check sizes
		}
	}
	
	/**
	 * Check that we do the right thing when the list of which
	 *  sectors are BAT blocks points off the list of
	 *  sectors that exist in the file.
	 */
	public void testFATandDIFATsectors() throws Exception {
      POIDataSamples _samples = POIDataSamples.getPOIFSInstance();
      
      // Open the file up
      try {
         POIFSFileSystem fs = new POIFSFileSystem(
             _samples.openResourceAsStream("ReferencesInvalidSectors.mpp")
         );
         fail("File is corrupt and shouldn't have been opened");
      } catch(IOException e) {
         String msg = e.getMessage();
         assertTrue(msg.startsWith("Your file contains 695 sectors"));
      }
	}
	
	/**
	 * Most OLE2 files use 512byte blocks. However, a small number
	 *  use 4k blocks. Check that we can open these.
	 * DISABLED until we get a sample 4k block file that's under 22mb...
	 */
	public void test4KBlocks() throws Exception {
      POIDataSamples _samples = POIDataSamples.getPOIFSInstance();
	   InputStream inp = _samples.openResourceAsStream("BlockSize4096.zvi");
	   
	   // First up, check that we can process the header properly
      HeaderBlockReader header_block_reader = new HeaderBlockReader(inp);
      POIFSBigBlockSize bigBlockSize = header_block_reader.getBigBlockSize();
      assertEquals(4096, bigBlockSize.getBigBlockSize());
      
      // Check the fat info looks sane
      assertEquals(109, header_block_reader.getBATArray().length);
      assertTrue(header_block_reader.getBATCount() > 0);
      assertEquals(0, header_block_reader.getXBATCount());
      
      // Now check we can get the basic fat
      RawDataBlockList data_blocks = new RawDataBlockList(inp, bigBlockSize);

	   
	   // Now try and open properly
	   POIFSFileSystem fs = new POIFSFileSystem(
	         _samples.openResourceAsStream("BlockSize4096.zvi")
	   );
	   assertTrue(fs.getRoot().getEntryCount() > 3);
	   
	   // Finally, check we can do a similar 512byte one too
	   fs = new POIFSFileSystem(
            _samples.openResourceAsStream("BlockSize512.zvi")
      );
      assertTrue(fs.getRoot().getEntryCount() > 3);
	}

	private static InputStream openSampleStream(String sampleFileName) {
		return HSSFTestDataSamples.openSampleFileStream(sampleFileName);
	}
}