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/*
* Copyright (C) 2007 The Guava Authors
*
* Licensed 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 com.google.common.io;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;
import com.google.common.primitives.Bytes;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.IOException;
import junit.framework.TestCase;
/**
* Test class for {@link LittleEndianDataInputStream}.
*
* @author Chris Nokleberg
*/
public class LittleEndianDataInputStreamTest extends TestCase {
private byte[] data;
@Override
protected void setUp() throws Exception {
super.setUp();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(baos);
initializeData(out);
data = baos.toByteArray();
}
private void initializeData(DataOutputStream out) throws IOException {
/* Write out various test values NORMALLY */
out.write(new byte[] {-100, 100});
out.writeBoolean(true);
out.writeBoolean(false);
out.writeByte(100);
out.writeByte(-100);
out.writeByte((byte) 200);
out.writeChar('a');
out.writeShort((short) -30000);
out.writeShort((short) 50000);
out.writeInt(0xCAFEBABE);
out.writeLong(0xDEADBEEFCAFEBABEL);
out.writeUTF("Herby Derby");
out.writeFloat(Float.intBitsToFloat(0xCAFEBABE));
out.writeDouble(Double.longBitsToDouble(0xDEADBEEFCAFEBABEL));
}
public void testReadFully() throws IOException {
DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(data));
byte[] b = new byte[data.length];
in.readFully(b);
assertEquals(Bytes.asList(data), Bytes.asList(b));
}
public void testReadUnsignedByte_eof() throws IOException {
DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(new byte[0]));
assertThrows(EOFException.class, () -> in.readUnsignedByte());
}
public void testReadUnsignedShort_eof() throws IOException {
byte[] buf = {23};
DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(buf));
assertThrows(EOFException.class, () -> in.readUnsignedShort());
}
@SuppressWarnings("DoNotCall")
public void testReadLine() throws IOException {
DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(data));
UnsupportedOperationException expected =
assertThrows(UnsupportedOperationException.class, () -> in.readLine());
assertThat(expected).hasMessageThat().isEqualTo("readLine is not supported");
}
public void testReadLittleEndian() throws IOException {
DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(data));
/* Read in various values in LITTLE ENDIAN FORMAT */
byte[] b = new byte[2];
in.readFully(b);
assertEquals(-100, b[0]);
assertEquals(100, b[1]);
assertEquals(true, in.readBoolean());
assertEquals(false, in.readBoolean());
assertEquals(100, in.readByte());
assertEquals(-100, in.readByte());
assertEquals(200, in.readUnsignedByte());
assertEquals('\u6100', in.readChar());
assertEquals(-12150, in.readShort());
assertEquals(20675, in.readUnsignedShort());
assertEquals(0xBEBAFECA, in.readInt());
assertEquals(0xBEBAFECAEFBEADDEL, in.readLong());
assertEquals("Herby Derby", in.readUTF());
assertEquals(0xBEBAFECA, Float.floatToIntBits(in.readFloat()));
assertEquals(0xBEBAFECAEFBEADDEL, Double.doubleToLongBits(in.readDouble()));
}
public void testSkipBytes() throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(baos);
/* Write out various test values NORMALLY */
out.write(new byte[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}); // 10 bytes of junk to skip
initializeData(out);
byte[] data = baos.toByteArray();
DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(data));
int bytesSkipped = 0;
while (bytesSkipped < 10) {
bytesSkipped += in.skipBytes(10 - bytesSkipped);
}
/* Read in various values in LITTLE ENDIAN FORMAT */
byte[] b = new byte[2];
in.readFully(b);
assertEquals(-100, b[0]);
assertEquals(100, b[1]);
assertTrue(in.readBoolean());
assertFalse(in.readBoolean());
}
}
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