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// Copyright 2015 The Bazel Authors. 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 com.google.common.truth.Truth.assertWithMessage;
import static org.junit.Assert.fail;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.nio.ByteBuffer;
import java.util.Arrays;
/**
* Unit tests for {@link ScanUtil}.
*/
@RunWith(JUnit4.class)
public class ScanUtilTest {
@Test
public void testScanTo() {
try {
assertLocation(null, new byte[]{}, -1);
fail("No exception on null target");
} catch (NullPointerException ex) {
// expected
}
try {
assertLocation(new byte[] {}, null, -1);
fail("No exception on null domain");
} catch (NullPointerException ex) {
// expected
}
assertLocation(new byte[] {}, new byte[] {}, -1);
assertLocation(new byte[] {}, new byte[] {1}, 0);
assertLocation(new byte[] {}, new byte[] {1, 2, 3, 4}, 0);
assertLocation(new byte[] {1}, new byte[] {}, -1);
assertLocation(new byte[] {1}, new byte[] {1}, 0);
assertLocation(new byte[] {1}, new byte[] {1, 2, 3, 4}, 0);
assertLocation(new byte[] {1}, new byte[] {5, 4, 1, 2, 3, 4}, 2);
assertLocation(new byte[] {1}, new byte[] {4, 2, 3, 1}, 3);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {}, -1);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {1}, -1);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {1, 2, 3, 4}, 0);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {1, 2, 3, 4, 1, 2, 3, 4}, 0);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 1, 2, 3, 4}, 1);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 1, 2, 3, 4, 5}, 1);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 5, 1, 2, 3, 4}, 2);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 1, 1, 2, 3, 4}, 2);
assertLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 1, 2, 3, 5, 4}, -1);
}
@Test
public void testScanBackwardsTo() {
try {
assertBackwardsLocation(null, new byte[]{}, -1);
fail("No exception on null target");
} catch (NullPointerException ex) {
// expected
}
try {
assertBackwardsLocation(new byte[]{}, null, -1);
fail("No exception on null domain");
} catch (NullPointerException ex) {
// expected
}
assertBackwardsLocation(new byte[] {}, new byte[] {}, -1);
assertBackwardsLocation(new byte[] {}, new byte[] {1}, 0);
assertBackwardsLocation(new byte[] {}, new byte[] {1, 2, 3, 4}, 3);
assertBackwardsLocation(new byte[] {1}, new byte[] {}, -1);
assertBackwardsLocation(new byte[] {1}, new byte[] {1}, 0);
assertBackwardsLocation(new byte[] {1}, new byte[] {1, 2, 3, 4}, 0);
assertBackwardsLocation(new byte[] {1}, new byte[] {5, 4, 1, 2, 3, 4}, 2);
assertBackwardsLocation(new byte[] {1}, new byte[] {4, 2, 3, 1}, 3);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {}, -1);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {1}, -1);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {1, 2, 3, 4}, 0);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {1, 2, 3, 4, 1, 2, 3, 4}, 4);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {1, 2, 3, 4, 1, 2, 3, 4, 1}, 4);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 1, 2, 3, 4}, 1);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 1, 2, 3, 4, 5}, 1);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 5, 1, 2, 3, 4}, 2);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 1, 1, 2, 3, 4}, 2);
assertBackwardsLocation(new byte[] {1, 2, 3, 4}, new byte[] {5, 1, 2, 3, 5, 4}, -1);
}
private void assertLocation(byte[] target, byte[] domain, int expected) {
int pos = ScanUtil.scanTo(target, domain != null ? ByteBuffer.wrap(domain) : null);
assertWithMessage("Position of " + Arrays.toString(target) + " in " + Arrays.toString(domain))
.that(expected).isEqualTo(pos);
}
private void assertBackwardsLocation(byte[] target, byte[] domain, int expected) {
ByteBuffer buf = null;
if (domain != null) {
buf = ByteBuffer.wrap(domain);
buf.position(buf.limit());
}
int pos = ScanUtil.scanBackwardsTo(target, buf);
assertWithMessage("Position of " + Arrays.toString(target) + " in " + Arrays.toString(domain)
+ ", " + buf.position() + ", " + buf.limit())
.that(expected).isEqualTo(pos);
}
}
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