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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.android.apkzlib.zip.utils;
import static junit.framework.TestCase.assertEquals;
import static org.junit.Assert.assertArrayEquals;
import org.junit.Test;
import java.nio.ByteBuffer;
import java.util.Random;
public class LittleEndianUtilsTest {
@Test
public void read2Le() throws Exception {
assertEquals(0x0102, LittleEndianUtils.readUnsigned2Le(ByteBuffer.wrap(
new byte[] { 2, 1 })));
assertEquals(0xfedc, LittleEndianUtils.readUnsigned2Le(ByteBuffer.wrap(
new byte[] { (byte) 0xdc, (byte) 0xfe })));
}
@Test
public void write2Le() throws Exception {
ByteBuffer out = ByteBuffer.allocate(2);
LittleEndianUtils.writeUnsigned2Le(out, 0x0102);
assertArrayEquals(new byte[] { 2, 1 }, out.array());
out = ByteBuffer.allocate(2);
LittleEndianUtils.writeUnsigned2Le(out, 0xfedc);
assertArrayEquals(new byte[] { (byte) 0xdc, (byte) 0xfe }, out.array());
}
@Test
public void readWrite2Le() throws Exception {
Random r = new Random();
int range = 0x0000ffff;
final int COUNT = 1000;
int[] data = new int[COUNT];
for (int i = 0; i < data.length; i++) {
data[i] = r.nextInt(range);
}
ByteBuffer out = ByteBuffer.allocate(COUNT * 2);
for (int d : data) {
LittleEndianUtils.writeUnsigned2Le(out, d);
}
ByteBuffer in = ByteBuffer.wrap(out.array());
for (int i = 0; i < data.length; i++) {
assertEquals(data[i], LittleEndianUtils.readUnsigned2Le(in));
}
}
@Test
public void read4Le() throws Exception {
assertEquals(0x01020304, LittleEndianUtils.readUnsigned4Le(ByteBuffer.wrap(
new byte[] { 4, 3, 2, 1 })));
assertEquals(0xfedcba98L, LittleEndianUtils.readUnsigned4Le(ByteBuffer.wrap(
new byte[] { (byte) 0x98, (byte) 0xba, (byte) 0xdc, (byte) 0xfe })));
}
@Test
public void write4Le() throws Exception {
ByteBuffer out = ByteBuffer.allocate(4);
LittleEndianUtils.writeUnsigned4Le(out, 0x01020304);
assertArrayEquals(new byte[] { 4, 3, 2, 1 }, out.array());
out = ByteBuffer.allocate(4);
LittleEndianUtils.writeUnsigned4Le(out, 0xfedcba98L);
assertArrayEquals(new byte[] { (byte) 0x98, (byte) 0xba, (byte) 0xdc, (byte) 0xfe },
out.array());
}
@Test
public void readWrite4Le() throws Exception {
Random r = new Random();
final int COUNT = 1000;
long[] data = new long[COUNT];
for (int i = 0; i < data.length; i++) {
do {
data[i] = r.nextInt() - (long) Integer.MIN_VALUE;
} while (data[i] < 0);
}
ByteBuffer out = ByteBuffer.allocate(COUNT * 4);
for (long d : data) {
LittleEndianUtils.writeUnsigned4Le(out, d);
}
ByteBuffer in = ByteBuffer.wrap(out.array());
for (int i = 0; i < data.length; i++) {
assertEquals(data[i], LittleEndianUtils.readUnsigned4Le(in));
}
}
}
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