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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
// Deflater.java - Compress a data stream.
/* Copyright (C) 1999 Cygnus Solutions
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 gnu.gcj.RawData;
/**
* @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 Deflater
{
public static final int BEST_COMPRESSION = 9;
public static final int BEST_SPEED = 1;
public static final int DEFAULT_COMPRESSION = -1;
public static final int NO_COMPRESSION = 0;
public static final int DEFAULT_STRATEGY = 0;
public static final int FILTERED = 1;
public static final int HUFFMAN_ONLY = 2;
public static final int DEFLATED = 8;
public int deflate (byte[] buf)
{
return deflate (buf, 0, buf.length);
}
public native int deflate (byte[] buf, int off, int len);
public native void init (int level, boolean noHeader);
public native void update ();
public Deflater ()
{
this (DEFAULT_COMPRESSION, false);
}
public Deflater (int lvl)
{
this (lvl, false);
}
public Deflater (int lvl, boolean noHeader)
{
this.strategy = DEFAULT_STRATEGY;
init (lvl, noHeader);
setLevel (lvl);
}
public native void end ();
public void finalize ()
{
end ();
}
public native void finish ();
public synchronized boolean finished ()
{
return is_finished;
}
public native int getAdler ();
public native int getTotalIn ();
public native int getTotalOut ();
public native boolean needsInput ();
public native void reset ();
public void setDictionary (byte[] buf)
{
setDictionary (buf, 0, buf.length);
}
public native void setDictionary (byte[] buf, int off, int len);
public void setInput (byte[] buf)
{
setInput (buf, 0, buf.length);
}
public native void setInput (byte[] buf, int off, int len);
public synchronized void setLevel (int lvl)
{
if (lvl != -1 && (lvl < 0 || lvl > 9))
throw new IllegalArgumentException ();
level = (lvl == -1) ? 6 : lvl;
update ();
}
public synchronized void setStrategy (int stgy)
{
if (stgy != DEFAULT_STRATEGY && stgy != FILTERED
&& stgy != HUFFMAN_ONLY)
throw new IllegalArgumentException ();
strategy = stgy;
update ();
}
// Compression level.
private int level;
// Compression strategy.
private int strategy;
// The zlib stream.
private RawData zstream;
// True if finished.
private boolean is_finished;
// Total number of bytes made available at last setInput.
private int last_input_count;
// `Flush' flag to pass to next call to deflate.
private int flush_flag;
}
|
