Brianegge at 07:56, 4 July 2009

2009-07-04T07:56:17Z

← Older revision		Revision as of 07:56, 4 July 2009
Line 66:		Line 66:
	}		}
	</geshi>		</geshi>

			[[Category:Java]]

Brianegge: Created page with 'I ran a test to compress one million consecutive integers using various forms of compression. The results are as follows:

 None     4000027 Deflate  2006803 Filtered 139183…'

2009-07-04T07:39:45Z

Created page with 'I ran a test to compress one million consecutive integers using various forms of compression. The results are as follows: <pre> None 4000027 Deflate 2006803 Filtered 139183…'

New page

I ran a test to compress one million consecutive integers using various forms of compression. The results are as follows:
<pre>
None 4000027
Deflate 2006803
Filtered 1391833
BZip2 427067
Lzma 255040
</pre>

<geshi lang="java">
public class IntegerCompression extends TestCase {

private enum CompressMethod {
None, Deflate, Filtered, BZip2
}

private static int SIZE = 1000000;

private int[] getData() {
int[] data = new int[SIZE];
for (int i = 0; i < SIZE; i++) {
data[i] = i;
}
return data;
}

public void testDeflate() throws IOException {

for (CompressMethod m : CompressMethod.values()) {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(
compress(byteArrayOutputStream, m));
objectOutputStream.writeObject(getData());
objectOutputStream.close();
System.out.println(m + "\t" + byteArrayOutputStream.size());
}
}

public void testLzma() throws IOException {
Encoder encoder = new SevenZip.Compression.LZMA.Encoder();
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(byteArrayOutputStream);
oos.writeObject(getData());
oos.close();
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
byteArrayOutputStream = new ByteArrayOutputStream();
encoder.Code(byteArrayInputStream, byteArrayOutputStream, null);
System.out.println("Lzma\t" + byteArrayOutputStream.size());
}

private OutputStream compress(OutputStream stream, CompressMethod m)
throws IOException {
switch (m) {
case None:
return stream;
case Deflate:
return new DeflaterOutputStream(stream, new Deflater(Deflater.DEFAULT_COMPRESSION, true));
case Filtered:
return new DeflaterOutputStream(stream, new Deflater(Deflater.FILTERED , true));
case BZip2:
return new CBZip2OutputStream(stream);
}
throw new IllegalArgumentException();
}

}
</geshi>

Java Data Compression - Revision history

Brianegge at 07:56, 4 July 2009

Brianegge: Created page with 'I ran a test to compress one million consecutive integers using various forms of compression. The results are as follows:
None 4000027 Deflate 2006803 Filtered 139183…'