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comparison src/com/jcraft/jzlib/ZInputStream.java @ 0:0ce5cc452d02

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initial version
author Carl Byington <carl@five-ten-sg.com>
date Thu, 22 May 2014 10:41:19 -0700
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children 46c2115ae1c8
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-1:000000000000 0:0ce5cc452d02
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 ZInputStream extends FilterInputStream {
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 InputStream in = null;
48
49 public ZInputStream(InputStream in) {
50 this(in, false);
51 }
52 public ZInputStream(InputStream in, boolean nowrap) {
53 super(in);
54 this.in = in;
55 z.inflateInit(nowrap);
56 compress = false;
57 z.next_in = buf;
58 z.next_in_index = 0;
59 z.avail_in = 0;
60 }
61
62 public ZInputStream(InputStream in, int level) {
63 super(in);
64 this.in = in;
65 z.deflateInit(level);
66 compress = true;
67 z.next_in = buf;
68 z.next_in_index = 0;
69 z.avail_in = 0;
70 }
71
72 /*public int available() throws IOException {
73 return inf.finished() ? 0 : 1;
74 }*/
75
76 public int read() throws IOException {
77 if (read(buf1, 0, 1) == -1)
78 return (-1);
79
80 return (buf1[0] & 0xFF);
81 }
82
83 private boolean nomoreinput = false;
84
85 public int read(byte[] b, int off, int len) throws IOException {
86 if (len == 0)
87 return (0);
88
89 int err;
90 z.next_out = b;
91 z.next_out_index = off;
92 z.avail_out = len;
93
94 do {
95 if ((z.avail_in == 0) && (!nomoreinput)) { // if buffer is empty and more input is avaiable, refill it
96 z.next_in_index = 0;
97 z.avail_in = in.read(buf, 0, bufsize); //(bufsize<z.avail_out ? bufsize : z.avail_out));
98
99 if (z.avail_in == -1) {
100 z.avail_in = 0;
101 nomoreinput = true;
102 }
103 }
104
105 if (compress)
106 err = z.deflate(flush);
107 else
108 err = z.inflate(flush);
109
110 if (nomoreinput && (err == JZlib.Z_BUF_ERROR))
111 return (-1);
112
113 if (err != JZlib.Z_OK && err != JZlib.Z_STREAM_END)
114 throw new ZStreamException((compress ? "de" : "in") + "flating: " + z.msg);
115
116 if ((nomoreinput || err == JZlib.Z_STREAM_END) && (z.avail_out == len))
117 return (-1);
118 }
119 while (z.avail_out == len && err == JZlib.Z_OK);
120
121 //System.err.print("("+(len-z.avail_out)+")");
122 return (len - z.avail_out);
123 }
124
125 public long skip(long n) throws IOException {
126 int len = 512;
127
128 if (n < len)
129 len = (int)n;
130
131 byte[] tmp = new byte[len];
132 return ((long)read(tmp));
133 }
134
135 public int getFlushMode() {
136 return (flush);
137 }
138
139 public void setFlushMode(int flush) {
140 this.flush = flush;
141 }
142
143 /**
144 * Returns the total number of bytes input so far.
145 */
146 public long getTotalIn() {
147 return z.total_in;
148 }
149
150 /**
151 * Returns the total number of bytes output so far.
152 */
153 public long getTotalOut() {
154 return z.total_out;
155 }
156
157 public void close() throws IOException {
158 in.close();
159 }
160 }