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/*
* Copyright (C) 2016 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.utils;
import static org.junit.Assert.assertTrue;
import com.android.testutils.TestResources;
import com.google.common.base.Preconditions;
import com.google.common.io.ByteSource;
import com.google.common.io.Resources;
import java.io.EOFException;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import javax.annotation.Nonnull;
/**
* Utility functions for tests.
*/
public final class ApkZFileTestUtils {
/**
* Reads a portion of a file to memory.
*
* @param file the file to read data from
* @param start the offset in the file to start reading
* @param length the number of bytes to read
* @return the bytes read
* @throws Exception failed to read the file
*/
@Nonnull
public static byte[] readSegment(@Nonnull File file, long start, int length) throws Exception {
Preconditions.checkArgument(start >= 0, "start < 0");
Preconditions.checkArgument(length >= 0, "length < 0");
byte data[];
try (RandomAccessFile raf = new RandomAccessFile(file, "r")) {
raf.seek(start);
data = new byte[length];
int tot = 0;
while (tot < length) {
int r = raf.read(data, tot, length - tot);
if (r < 0) {
throw new EOFException();
}
tot += r;
}
}
return data;
}
/**
* Obtains the test resource with the given path.
*
* @param path the path
* @return the test resource
*/
@Nonnull
public static File getResource(@Nonnull String path) {
File resource = TestResources.getFile(ApkZFileTestUtils.class, path);
assertTrue(resource.exists());
return resource;
}
/**
* Obtains the test resource with the given path.
*
* @param path the path
* @return the test resource
*/
@Nonnull
public static ByteSource getResourceBytes(@Nonnull String path) {
return Resources.asByteSource(Resources.getResource(ApkZFileTestUtils.class, path));
}
/**
* Sleeps the current thread for enough time to ensure that the local file system had enough
* time to notice a "tick". This method is usually called in tests when it is necessary to
* ensure filesystem writes are detected through timestamp modification.
*
* @param currentTimestamp last timestamp read from disk
* @throws InterruptedException waiting interrupted
* @throws IOException issues creating a temporary file
*/
public static void waitForFileSystemTick(long currentTimestamp)
throws InterruptedException, IOException {
while (getFreshTimestamp() <= currentTimestamp) {
Thread.sleep(100);
}
}
/**
* Obtains the timestamp of a newly-created file.
*
* @return the timestamp
* @throws IOException the I/O Exception
*/
private static long getFreshTimestamp() throws IOException {
File notUsed = File.createTempFile(ApkZFileTestUtils.class.getName(), "waitForFSTick");
long freshTimestamp = notUsed.lastModified();
assertTrue(notUsed.delete());
return freshTimestamp;
}
}
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