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DeflaterOutputStream.java, [...]: Reformatted.

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2004-07-09  Michael Koch  <konqueror@gmx.de>

	* java/util/zip/DeflaterOutputStream.java,
	java/util/zip/GZIPInputStream.java,
	java/util/zip/GZIPOutputStream.java,
	java/util/zip/InflaterInputStream.java:
	Reformatted. Added javadocs. Reordered all stuff.
	Renamed variables to be more clear.

From-SVN: r84380
This commit is contained in:
Michael Koch 2004-07-09 15:22:19 +00:00 • committed by Michael Koch
parent fbc40a17c9
commit d642571f32
5 changed files with 208 additions and 131 deletions
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108
libjava/java/util/zip/GZIPOutputStream.java
View file

@ -41,8 +41,12 @@ import java.io.IOException;
import java.io.OutputStream;
/**
* This filter stream is used to compress a stream into a "GZIP" stream.
* The "GZIP" format is described in RFC 1952.
*
* @author John Leuner
* @author Tom Tromey
* @date May 17, 1999
* @since JDK 1.1
*/
/* Written using on-line Java Platform 1.2 API Specification
@ -52,75 +56,91 @@ import java.io.OutputStream;
public class GZIPOutputStream extends DeflaterOutputStream
{
public void close () throws IOException
/**
* CRC-32 value for uncompressed data
*/
protected CRC32 crc;
/**
* Creates a GZIPOutputStream with the default buffer size
*
* @param out The stream to read data (to be compressed) from
*
*/
public GZIPOutputStream(OutputStream out) throws IOException
{
finish ();
out.close ();
this(out, 512);
}
public void finish () throws IOException
/**
* Creates a GZIPOutputStream with the specified buffer size
*
* @param out The stream to read compressed data from
* @param size Size of the buffer to use
*/
public GZIPOutputStream(OutputStream out, int size) throws IOException
{
super.finish();
put4 ((int) crc.getValue());
put4 (def.getTotalIn());
}
public GZIPOutputStream (OutputStream out) throws IOException
{
this (out, 512);
}
public GZIPOutputStream (OutputStream out, int readsize) throws IOException
{
super (out, new Deflater (Deflater.DEFAULT_COMPRESSION, true), readsize);
put2 (GZIPInputStream.GZIP_MAGIC);
out.write (GZIPInputStream.Z_DEFLATED);
super(out, new Deflater(Deflater.DEFAULT_COMPRESSION, true), size);
crc = new CRC32();
put2(GZIPInputStream.GZIP_MAGIC);
out.write(GZIPInputStream.Z_DEFLATED);
// No flags for now.
out.write (0);
out.write(0);
// No time either.
put2 (0);
put2 (0);
put2(0);
put2(0);
// No xflags either.
out.write (0);
out.write(0);
// FIXME: unknown OS.
out.write (255);
crc = new CRC32 ();
out.write(255);
}
public synchronized void write (int bval) throws IOException
public synchronized void write(int bval) throws IOException
{
super.write (bval);
crc.update (bval);
super.write(bval);
crc.update(bval);
}
public synchronized void write (byte[] buf) throws IOException
public synchronized void write(byte[] buf) throws IOException
{
write (buf, 0, buf.length);
write(buf, 0, buf.length);
}
public synchronized void write (byte[] buf, int off, int len)
public synchronized void write(byte[] buf, int off, int len)
throws IOException
{
super.write(buf, off, len);
crc.update(buf, off, len);
}
private final void put2 (int i) throws IOException
/**
* Writes remaining compressed output data to the output stream
* and closes it.
*/
public void close() throws IOException
{
out.write (i);
out.write (i >> 8);
finish();
out.close();
}
public void finish() throws IOException
{
super.finish();
put4((int) crc.getValue());
put4(def.getTotalIn());
}
private final void put2(int i) throws IOException
{
out.write(i);
out.write(i >> 8);
}
private final void put4 (int i) throws IOException
{
out.write (i);
out.write (i >> 8);
out.write (i >> 16);
out.write (i >> 24);
out.write(i);
out.write(i >> 8);
out.write(i >> 16);
out.write(i >> 24);
}
// Checksum used by this stream.
protected CRC32 crc;
}