1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
// GZIPOutputStream.java - Create a file in gzip format.
/* Copyright (C) 1999 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.util.zip;
import java.io.IOException;
import java.io.OutputStream;
/**
* @author Tom Tromey
* @date May 17, 1999
*/
/* Written using on-line Java Platform 1.2 API Specification
* and JCL book.
* Believed complete and correct.
*/
public class GZIPOutputStream extends DeflaterOutputStream
{
public void close () throws IOException
{
finish ();
out.close ();
}
public void finish () 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);
// No flags for now.
out.write (0);
// No time either.
put2 (0);
put2 (0);
// No xflags either.
out.write (0);
// FIXME: unknown OS.
out.write (255);
crc = new CRC32 ();
}
public synchronized void write (byte[] buf) throws IOException
{
write (buf, 0, buf.length);
}
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
{
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);
}
// Checksum used by this stream.
protected CRC32 crc;
}
|
