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Java > Open Source Codes > com > jcraft > jzlib > ZOutputStream


1 /* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
2 /*
3 Copyright (c) 2001 Lapo Luchini.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
7
8   1. Redistributions of source code must retain the above copyright notice,
9      this list of conditions and the following disclaimer.
10
11   2. Redistributions in binary form must reproduce the above copyright
12      notice, this list of conditions and the following disclaimer in
13      the documentation and/or other materials provided with the distribution.
14
15   3. The names of the authors may not be used to endorse or promote products
16      derived from this software without specific prior written permission.
17
18 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
19 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS
21 OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
22 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
24 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
27 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 /*
30  * This program is based on zlib-1.1.3, so all credit should go authors
31  * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
32  * and contributors of zlib.
33  */
34
35 package com.jcraft.jzlib;
36 import java.io.*;
37
38 public class ZOutputStream extends OutputStream {
39
40   protected ZStream z=new ZStream();
41   protected int bufsize=512;
42   protected int flush=JZlib.Z_NO_FLUSH;
43   protected byte[] buf=new byte[bufsize],
44                    buf1=new byte[1];
45   protected boolean compress;
46
47   protected OutputStream out;
48
49   public ZOutputStream(OutputStream out) {
50     super();
51     this.out=out;
52     z.inflateInit();
53     compress=false;
54   }
55
56   public ZOutputStream(OutputStream out, int level) {
57     this(out, level, false);
58   }
59   public ZOutputStream(OutputStream out, int level, boolean nowrap) {
60     super();
61     this.out=out;
62     z.deflateInit(level, nowrap);
63     compress=true;
64   }
65
66   public void write(int b) throws IOException {
67     buf1[0]=(byte)b;
68     write(buf1, 0, 1);
69   }
70
71   public void write(byte b[], int off, int len) throws IOException {
72     if(len==0)
73       return;
74     int err;
75     z.next_in=b;
76     z.next_in_index=off;
77     z.avail_in=len;
78     do{
79       z.next_out=buf;
80       z.next_out_index=0;
81       z.avail_out=bufsize;
82       if(compress)
83         err=z.deflate(flush);
84       else
85         err=z.inflate(flush);
86       if(err!=JZlib.Z_OK)
87         throw new ZStreamException((compress?"de":"in")+"flating: "+z.msg);
88       out.write(buf, 0, bufsize-z.avail_out);
89     }
90     while(z.avail_in>0 || z.avail_out==0);
91   }
92
93   public int getFlushMode() {
94     return(flush);
95   }
96
97   public void setFlushMode(int flush) {
98     this.flush=flush;
99   }
100
101   public void finish() throws IOException {
102     int err;
103     do{
104       z.next_out=buf;
105       z.next_out_index=0;
106       z.avail_out=bufsize;
107       if(compress){ err=z.deflate(JZlib.Z_FINISH); }
108       else{ err=z.inflate(JZlib.Z_FINISH); }
109       if(err!=JZlib.Z_STREAM_END && err != JZlib.Z_OK)
110       throw new ZStreamException((compress?"de":"in")+"flating: "+z.msg);
111       if(bufsize-z.avail_out>0){
112     out.write(buf, 0, bufsize-z.avail_out);
113       }
114     }
115     while(z.avail_in>0 || z.avail_out==0);
116     flush();
117   }
118   public void end() {
119     if(z==null)
120       return;
121     if(compress){ z.deflateEnd(); }
122     else{ z.inflateEnd(); }
123     z.free();
124     z=null;
125   }
126   public void close() throws IOException {
127     try{
128       try{finish();}
129       catch (IOException ignored) {}
130     }
131     finally{
132       end();
133       out.close();
134       out=null;
135     }
136   }
137
138   /**
139    * Returns the total number of bytes input so far.
140    */
141   public long getTotalIn() {
142     return z.total_in;
143   }
144
145   /**
146    * Returns the total number of bytes output so far.
147    */
148   public long getTotalOut() {
149     return z.total_out;
150   }
151
152   public void flush() throws IOException {
153     out.flush();
154   }
155
156 }
157
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