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/*
* Copyright (C) 2008 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 android.core;
import junit.framework.TestCase;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import android.test.suitebuilder.annotation.LargeTest;
/**
* Basic tests for ZipStream
*/
public class ZipStreamTest extends TestCase {
@LargeTest
public void testZipStream() throws Exception {
ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
createCompressedZip(bytesOut);
byte[] zipData = bytesOut.toByteArray();
/*
FileOutputStream outFile = new FileOutputStream("/tmp/foo.zip");
outFile.write(zipData, 0, zipData.length);
outFile.close();
*/
/*
FileInputStream inFile = new FileInputStream("/tmp/foo.zip");
int inputLength = inFile.available();
zipData = new byte[inputLength];
if (inFile.read(zipData) != inputLength)
throw new RuntimeException();
inFile.close();
*/
ByteArrayInputStream bytesIn = new ByteArrayInputStream(zipData);
scanZip(bytesIn);
bytesOut = new ByteArrayOutputStream();
createUncompressedZip(bytesOut);
zipData = bytesOut.toByteArray();
bytesIn = new ByteArrayInputStream(zipData);
scanZip(bytesIn);
}
/*
* stepStep == 0 --> >99% compression
* stepStep == 1 --> ~30% compression
* stepStep == 2 --> no compression
*/
private static byte[] makeSampleFile(int stepStep) throws IOException {
byte[] sample = new byte[128 * 1024];
byte val, step;
int i, j, offset;
val = 0;
step = 1;
offset = 0;
for (i = 0; i < (128 * 1024) / 256; i++) {
for (j = 0; j < 256; j++) {
sample[offset++] = val;
val += step;
}
step += stepStep;
}
return sample;
}
private static void createCompressedZip(ByteArrayOutputStream bytesOut) throws IOException {
ZipOutputStream out = new ZipOutputStream(bytesOut);
try {
int i;
for (i = 0; i < 3; i++) {
byte[] input = makeSampleFile(i);
ZipEntry newEntry = new ZipEntry("file-" + i);
if (i != 1)
newEntry.setComment("this is file " + i);
out.putNextEntry(newEntry);
out.write(input, 0, input.length);
out.closeEntry();
}
out.setComment("This is a lovely compressed archive!");
} finally {
out.close();
}
}
private static void createUncompressedZip(ByteArrayOutputStream bytesOut) throws IOException {
ZipOutputStream out = new ZipOutputStream(bytesOut);
try {
long[] crcs = {0x205fbff3, 0x906fae57L, 0x2c235131};
int i;
for (i = 0; i < 3; i++) {
byte[] input = makeSampleFile(i);
ZipEntry newEntry = new ZipEntry("file-" + i);
if (i != 1)
newEntry.setComment("this is file " + i);
newEntry.setMethod(ZipEntry.STORED);
newEntry.setSize(128 * 1024);
newEntry.setCrc(crcs[i]);
out.putNextEntry(newEntry);
out.write(input, 0, input.length);
out.closeEntry();
}
out.setComment("This is a lovely, but uncompressed, archive!");
} finally {
out.close();
}
}
private static void scanZip(ByteArrayInputStream bytesIn) throws IOException {
ZipInputStream in = new ZipInputStream(bytesIn);
try {
int i;
for (i = 0; i < 3; i++) {
ZipEntry entry = in.getNextEntry();
ByteArrayOutputStream contents = new ByteArrayOutputStream();
byte[] buf = new byte[4096];
int len, totalLen = 0;
while ((len = in.read(buf)) > 0) {
contents.write(buf, 0, len);
totalLen += len;
}
assertEquals(128 * 1024, totalLen);
// System.out.println("ZipStreamTest: name='" + entry.getName()
// + "', zero=" + contents.toByteArray()[0]
// + ", tfs=" + contents.toByteArray()[257]
// + ", crc=" + Long.toHexString(entry.getCrc()));
}
assertNull("should only be three entries", in.getNextEntry());
} finally {
in.close();
}
}
}
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