/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package freenet.support.compress;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import junit.framework.TestCase;
import freenet.support.api.Bucket;
import freenet.support.api.BucketFactory;
import freenet.support.io.ArrayBucket;
import freenet.support.io.ArrayBucketFactory;
import freenet.support.io.Closer;
import freenet.support.io.NullBucket;
/**
* Test case for {@link freenet.support.compress.GzipCompressor} class.
*
* @author stuart martin <wavey@freenetproject.org>
*/
public class GzipCompressorTest extends TestCase {
public static final String UNCOMPRESSED_DATA_1 = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+ "aksjdhaskjsdhaskjdhaksjdhkajsdhkasdhkqhdioqahdkashdkashdnkashdnaskdhnkasjhdnkasjhdnkasjhdnkasjhdnkasjhdnkashdnkasjhdnkasjhdnkasjhndkasjhdna"
+ "djjjjjjjjjjjjjjj3j12j312j312j312j31j23hj123niah1ia3h1iu2b321uiab31ugb312gba38gab23igb12i3ag1b2ig3bi1g3bi1gba3iu12ba3iug1bi3ug1b2i3gab1i2ua3";
private static final byte[] COMPRESSED_DATA_1 = { 31, -117, 8, 0, 0, 0, 0, 0, 0, 0, -99, -117, 81, 10, -60, 48, 8, 68, -49, -92, -13, -77,
-41, 25, 9, 36, 26, -24, 82, 66, -18, 95, -37, -12, -89, -80, 44, -53, 14, -8, 70, 71, 37, -1, -108, -3, 36, -10, 17, -91, 113, -12,
24, -53, -110, 87, -44, 121, 38, -99, 39, -10, 86, -4, -67, -77, -107, 28, 111, 108, -117, -7, 81, -38, -39, -57, -118, -66, -39,
-25, -43, 86, -18, -119, 37, -98, 66, -120, 6, 30, 21, -118, -106, 41, 54, 103, 19, 39, 18, 83, 13, 42, -45, 105, -112, 89, 19, 90,
-115, 120, 85, -102, -62, -85, -119, 58, 88, -59, -44, 43, -52, 101, 33, 15, 124, -118, 94, -106, 59, -57, -68, 46, -112, 79, -30,
58, -119, 3, -88, -111, 58, 68, 117, 1, 0, 0 };
/**
* test GZIP compressor's identity and functionality
*/
public void testGzipCompressor() throws IOException {
Compressor.COMPRESSOR_TYPE gzipCompressor = Compressor.COMPRESSOR_TYPE.GZIP;
Compressor compressorZero = Compressor.COMPRESSOR_TYPE.getCompressorByMetadataID((short)0);
// check GZIP is the first compressor
assertEquals(gzipCompressor, compressorZero);
}
public void testCompress() throws IOException {
// do gzip compression
byte[] compressedData = doCompress(UNCOMPRESSED_DATA_1.getBytes());
// output size same as expected?
assertEquals(compressedData.length, COMPRESSED_DATA_1.length);
// check each byte is exactly as expected
for (int i = 0; i < compressedData.length; i++) {
assertEquals(COMPRESSED_DATA_1[i], compressedData[i]);
}
}
public void testBucketDecompress() throws IOException {
byte[] compressedData = COMPRESSED_DATA_1;
// do gzip decompression with buckets
byte[] uncompressedData = doBucketDecompress(compressedData);
// is the (round-tripped) uncompressed string the same as the original?
String uncompressedString = new String(uncompressedData);
assertEquals(uncompressedString, UNCOMPRESSED_DATA_1);
}
public void testByteArrayDecompress() throws IOException {
// build 5k array
byte[] originalUncompressedData = new byte[5 * 1024];
for(int i = 0; i < originalUncompressedData.length; i++) {
originalUncompressedData[i] = 1;
}
byte[] compressedData = doCompress(originalUncompressedData);
byte[] outUncompressedData = new byte[5 * 1024];
int writtenBytes = 0;
writtenBytes = Compressor.COMPRESSOR_TYPE.GZIP.decompress(compressedData, 0, compressedData.length, outUncompressedData);
assertEquals(writtenBytes, originalUncompressedData.length);
assertEquals(originalUncompressedData.length, outUncompressedData.length);
// check each byte is exactly as expected
for (int i = 0; i < outUncompressedData.length; i++) {
assertEquals(originalUncompressedData[i], outUncompressedData[i]);
}
}
public void testCompressException() throws IOException {
byte[] uncompressedData = UNCOMPRESSED_DATA_1.getBytes();
Bucket inBucket = new ArrayBucket(uncompressedData);
BucketFactory factory = new ArrayBucketFactory();
try {
Compressor.COMPRESSOR_TYPE.GZIP.compress(inBucket, factory, 32, 32);
} catch (CompressionOutputSizeException e) {
// expect this
return;
}
// TODO LOW codec doesn't actually enforce size limit
//fail("did not throw expected CompressionOutputSizeException");
}
public void testDecompressException() throws IOException {
// build 5k array
byte[] uncompressedData = new byte[5 * 1024];
for(int i = 0; i < uncompressedData.length; i++) {
uncompressedData[i] = 1;
}
byte[] compressedData = doCompress(uncompressedData);
Bucket inBucket = new ArrayBucket(compressedData);
NullBucket outBucket = new NullBucket();
InputStream decompressorInput = null;
OutputStream decompressorOutput = null;
try {
decompressorInput = inBucket.getInputStream();
decompressorOutput = outBucket.getOutputStream();
Compressor.COMPRESSOR_TYPE.GZIP.decompress(decompressorInput, decompressorOutput, 4096 + 10, 4096 + 20);
decompressorInput.close();
decompressorOutput.close();
} catch (CompressionOutputSizeException e) {
// expect this
return;
} finally {
Closer.close(decompressorInput);
Closer.close(decompressorOutput);
inBucket.free();
outBucket.free();
}
fail("did not throw expected CompressionOutputSizeException");
}
private byte[] doBucketDecompress(byte[] compressedData) throws IOException {
ByteArrayInputStream decompressorInput = new ByteArrayInputStream(compressedData);
ByteArrayOutputStream decompressorOutput = new ByteArrayOutputStream();
Compressor.COMPRESSOR_TYPE.GZIP.decompress(decompressorInput, decompressorOutput, 32768, 32768 * 2);
byte[] outBuf = decompressorOutput.toByteArray();
try {
decompressorInput.close();
decompressorOutput.close();
} finally {
Closer.close(decompressorInput);
Closer.close(decompressorOutput);
}
return outBuf;
}
private byte[] doCompress(byte[] uncompressedData) throws IOException {
Bucket inBucket = new ArrayBucket(uncompressedData);
BucketFactory factory = new ArrayBucketFactory();
Bucket outBucket = null;
outBucket = Compressor.COMPRESSOR_TYPE.GZIP.compress(inBucket, factory, 32768, 32768);
InputStream in = null;
in = outBucket.getInputStream();
long size = outBucket.size();
byte[] outBuf = new byte[(int) size];
in.read(outBuf);
return outBuf;
}
}