/* This code is part of Freenet. It is distributed under the GNU General
* Public License, version 2 (or at your option any later version). See
* http://www.gnu.org/ for further details of the GPL. */
package freenet.support.compress;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Random;
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.Bzip2Compressor} class.
*/
public class NewLzmaCompressorTest extends TestCase {
private static final String UNCOMPRESSED_DATA_1 = GzipCompressorTest.UNCOMPRESSED_DATA_1;
/**
* test BZIP2 compressor's identity and functionality
*/
public void testNewLzmaCompressor() throws IOException {
Compressor.COMPRESSOR_TYPE lzcompressor = Compressor.COMPRESSOR_TYPE.LZMA_NEW;
Compressor compressorZero = Compressor.COMPRESSOR_TYPE.getCompressorByMetadataID((short)3);
// check BZIP2 is the second compressor
assertEquals(lzcompressor, compressorZero);
}
// FIXME add exact decompression check.
// public void testCompress() throws IOException {
//
// // do bzip2 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 bzip2 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.LZMA_NEW.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 testRandomByteArrayDecompress() throws IOException {
Random random = new Random(1234);
for(int rounds=0;rounds<100;rounds++) {
int scale = random.nextInt(19) + 1;
int size = random.nextInt(1 << scale);
// build 5k array
byte[] originalUncompressedData = new byte[size];
random.nextBytes(originalUncompressedData);
byte[] compressedData = doCompress(originalUncompressedData);
byte[] outUncompressedData = new byte[size];
int writtenBytes = 0;
writtenBytes = Compressor.COMPRESSOR_TYPE.LZMA_NEW.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.LZMA_NEW.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.LZMA_NEW.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();
}
// TODO LOW codec doesn't actually enforce size limit
//fail("did not throw expected CompressionOutputSizeException");
}
private byte[] doCompress(byte[] uncompressedData) throws IOException {
Bucket inBucket = new ArrayBucket(uncompressedData);
BucketFactory factory = new ArrayBucketFactory();
Bucket outBucket = null;
outBucket = Compressor.COMPRESSOR_TYPE.LZMA_NEW.compress(inBucket, factory, uncompressedData.length, uncompressedData.length * 2 + 64);
InputStream in = null;
in = outBucket.getInputStream();
long size = outBucket.size();
byte[] outBuf = new byte[(int) size];
in.read(outBuf);
return outBuf;
}
}