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/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.poifs.nio;
import java.io.File;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import org.apache.poi.POIDataSamples;
import junit.framework.TestCase;
/**
* Tests for the datasource implementations
*/
public class TestDataSource extends TestCase
{
private static POIDataSamples data = POIDataSamples.getPOIFSInstance();
public void testFile() throws Exception {
File f = data.getFile("Notes.ole2");
FileBackedDataSource ds = new FileBackedDataSource(f);
try {
assertEquals(8192, ds.size());
// Start of file
ByteBuffer bs;
bs = ds.read(4, 0);
assertEquals(4, bs.capacity());
assertEquals(0, bs.position());
assertEquals(0xd0-256, bs.get(0));
assertEquals(0xcf-256, bs.get(1));
assertEquals(0x11-000, bs.get(2));
assertEquals(0xe0-256, bs.get(3));
assertEquals(0xd0-256, bs.get());
assertEquals(0xcf-256, bs.get());
assertEquals(0x11-000, bs.get());
assertEquals(0xe0-256, bs.get());
// Mid way through
bs = ds.read(8, 0x400);
assertEquals(8, bs.capacity());
assertEquals(0, bs.position());
assertEquals((byte)'R', bs.get(0));
assertEquals(0, bs.get(1));
assertEquals((byte)'o', bs.get(2));
assertEquals(0, bs.get(3));
assertEquals((byte)'o', bs.get(4));
assertEquals(0, bs.get(5));
assertEquals((byte)'t', bs.get(6));
assertEquals(0, bs.get(7));
// Can go to the end, but not past it
bs = ds.read(8, 8190);
assertEquals(0, bs.position()); // TODO How best to warn of a short read?
// Can't go off the end
try {
bs = ds.read(4, 8192);
fail("Shouldn't be able to read off the end of the file");
} catch(IllegalArgumentException e) {}
} finally {
ds.close();
}
}
public void testByteArray() throws Exception {
byte[] data = new byte[256];
byte b;
for(int i=0; i<data.length; i++) {
b = (byte)i;
data[i] = b;
}
ByteArrayBackedDataSource ds = new ByteArrayBackedDataSource(data);
// Start
ByteBuffer bs;
bs = ds.read(4, 0);
assertEquals(0, bs.position());
assertEquals(0x00, bs.get());
assertEquals(0x01, bs.get());
assertEquals(0x02, bs.get());
assertEquals(0x03, bs.get());
// Middle
bs = ds.read(4, 100);
assertEquals(100, bs.position());
assertEquals(100, bs.get());
assertEquals(101, bs.get());
assertEquals(102, bs.get());
assertEquals(103, bs.get());
// End
bs = ds.read(4, 252);
assertEquals(-4, bs.get());
assertEquals(-3, bs.get());
assertEquals(-2, bs.get());
assertEquals(-1, bs.get());
// Off the end
bs = ds.read(4, 254);
assertEquals(-2, bs.get());
assertEquals(-1, bs.get());
try {
bs.get();
fail("Shouldn't be able to read off the end");
} catch(BufferUnderflowException e) {}
// Past the end
try {
bs = ds.read(4, 256);
fail("Shouldn't be able to read off the end");
} catch(IndexOutOfBoundsException e) {}
// Overwrite
bs = ByteBuffer.allocate(4);
bs.put(0, (byte)-55);
bs.put(1, (byte)-54);
bs.put(2, (byte)-53);
bs.put(3, (byte)-52);
assertEquals(256, ds.size());
ds.write(bs, 40);
assertEquals(256, ds.size());
bs = ds.read(4, 40);
assertEquals(-55, bs.get());
assertEquals(-54, bs.get());
assertEquals(-53, bs.get());
assertEquals(-52, bs.get());
// Append
bs = ByteBuffer.allocate(4);
bs.put(0, (byte)-55);
bs.put(1, (byte)-54);
bs.put(2, (byte)-53);
bs.put(3, (byte)-52);
assertEquals(256, ds.size());
ds.write(bs, 256);
assertEquals(260, ds.size());
bs = ds.read(4, 256);
assertEquals(256, bs.position());
assertEquals(-55, bs.get());
assertEquals(-54, bs.get());
assertEquals(-53, bs.get());
assertEquals(-52, bs.get());
}
}
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