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// Copyright 2015 Google Inc. All rights reserved.
//
// 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.devtools.build.android.ziputils;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.fail;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* Unit tests for {@link View}.
*/
@RunWith(JUnit4.class)
public class ViewTest {
private static final FakeFileSystem fileSystem = new FakeFileSystem();
@Test
public void testView() {
// View takes ownership of constructor argument!
// Subclasses are responsible for slicing, when needed.
ByteBuffer buffer = ByteBuffer.allocate(100);
TestView instance = new TestView(buffer);
buffer.putInt(12345678);
int fromBuf = buffer.getInt(0);
int fromView = instance.getInt(0);
assertEquals("must assume buffer ownership", fromBuf, fromView);
int posBuf = buffer.position();
int posView = instance.buffer.position();
assertEquals("must assume buffer ownership", posBuf, posView);
}
@Test
public void testAt() {
long fileOffset = 0L;
ByteBuffer buffer = ByteBuffer.allocate(100);
TestView instance = new TestView(buffer);
View<TestView> result = instance.at(fileOffset);
assertSame("didn't return this", instance, result);
long resultValue = instance.fileOffset();
assertEquals("didn't return set value", fileOffset, resultValue);
}
@Test
public void testFileOffset() {
ByteBuffer buffer = ByteBuffer.allocate(100);
TestView instance = new TestView(buffer);
long expResult = -1L;
long result = instance.fileOffset();
assertEquals("default file offset should be -1", expResult, result);
}
@Test
public void testFinish() {
ByteBuffer buffer = ByteBuffer.allocate(100);
TestView instance = new TestView(buffer);
int limit = instance.buffer.limit();
int pos = instance.buffer.position();
assertEquals("initial limit", 100, limit);
assertEquals("initial position", 0, pos);
instance.putInt(1234);
limit = instance.buffer.limit();
pos = instance.buffer.position();
assertEquals("limit unchanged", 100, limit);
assertEquals("position advanced", 4, pos);
instance.buffer.flip();
int finishedLimit = instance.buffer.limit();
int finishedPos = instance.buffer.position();
assertEquals("must set limit to position", pos, finishedLimit);
assertEquals("must set position to 0", 0, finishedPos);
}
@Test
public void testWriteTo() throws Exception {
FileChannel file = fileSystem.getOutputChannel("hello", false);
byte[] bytes = "hello world".getBytes(UTF_8);
ByteBuffer buffer = ByteBuffer.wrap(bytes);
TestView instance = new TestView(buffer);
int expResult = bytes.length;
instance.buffer.rewind();
int result = file.write(instance.buffer);
file.close();
assertEquals("incorrect number of bytes written", expResult, result);
byte[] bytesWritten = fileSystem.toByteArray("hello");
Assert.assertArrayEquals("incorrect bytes written", bytes, bytesWritten);
}
@Test
public void testGetBytes() {
int off = 3;
int len = 5;
byte[] bytes = "hello world".getBytes(UTF_8);
ByteBuffer buffer = ByteBuffer.wrap(bytes);
TestView instance = new TestView(buffer);
byte[] expResult = "lo wo".getBytes(UTF_8);
byte[] result = instance.getBytes(off, len);
assertArrayEquals("incorrect bytes returned", expResult, result);
try {
instance.getBytes(bytes.length - len + 1, len);
fail("expected Exception");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
instance.getBytes(-1, len);
fail("expected Exception");
} catch (IndexOutOfBoundsException ex) {
// expected
}
}
@Test
public void testGetString() {
int off = 6;
int len = 5;
byte[] bytes = "hello world".getBytes(UTF_8);
ByteBuffer buffer = ByteBuffer.wrap(bytes);
TestView instance = new TestView(buffer);
String expResult = "world";
String result = instance.getString(off, len);
assertEquals("didn't return this", expResult, result);
try {
instance.getString(off + 1, len);
fail("expected Exception");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
instance.getString(-1, len);
fail("expected Exception");
} catch (IndexOutOfBoundsException ex) {
// expected
}
}
@Test
public void testByteOrder() {
byte[] bytes = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
TestView instance = new TestView(ByteBuffer.wrap(bytes));
int expValue = 0x08070605;
int value = instance.getInt(4);
assertEquals("Byte order incorrect", expValue, value);
}
static class TestView extends View<TestView> {
TestView(ByteBuffer buffer) {
super(buffer);
}
// Will advance buffer position
public void putInt(int value) {
buffer.putInt(value);
}
// Will advance buffer position
public int getInt() {
return buffer.getInt();
}
// will not advance buffer position
public void putInt(int index, int value) {
buffer.putInt(index, value);
}
// will not advance buffer position
public int getInt(int index) {
return buffer.getInt(index);
}
}
}
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