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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/java/util/zip/InflaterInputStream.java (1 of 18352 files). Show all

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java/pkg/java/util/zip/InflaterInputStream.java+288−0
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1+/*
2+ * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
10+ *
11+ * This code is distributed in the hope that it will be useful, but WITHOUT
12+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14+ * version 2 for more details (a copy is included in the LICENSE file that
15+ * accompanied this code).
16+ *
17+ * You should have received a copy of the GNU General Public License version
18+ * 2 along with this work; if not, write to the Free Software Foundation,
19+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20+ *
21+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22+ * or visit www.oracle.com if you need additional information or have any
23+ * questions.
24+ */
25+
26+package java.util.zip;
27+
28+import java.io.FilterInputStream;
29+import java.io.InputStream;
30+import java.io.IOException;
31+import java.io.EOFException;
32+
33+/**
34+ * This class implements a stream filter for uncompressing data in the
35+ * "deflate" compression format. It is also used as the basis for other
36+ * decompression filters, such as GZIPInputStream.
37+ *
38+ * @see Inflater
39+ * @author David Connelly
40+ */
41+public
42+class InflaterInputStream extends FilterInputStream {
43+ /**
44+ * Decompressor for this stream.
45+ */
46+ protected Inflater inf;
47+
48+ /**
49+ * Input buffer for decompression.
50+ */
51+ protected byte[] buf;
52+
53+ /**
54+ * Length of input buffer.
55+ */
56+ protected int len;
57+
58+ private boolean closed = false;
59+ // this flag is set to true after EOF has reached
60+ private boolean reachEOF = false;
61+
62+ /**
63+ * Check to make sure that this stream has not been closed
64+ */
65+ private void ensureOpen() throws IOException {
66+ if (closed) {
67+ throw new IOException("Stream closed");
68+ }
69+ }
70+
71+
72+ /**
73+ * Creates a new input stream with the specified decompressor and
74+ * buffer size.
75+ * @param in the input stream
76+ * @param inf the decompressor ("inflater")
77+ * @param size the input buffer size
78+ * @exception IllegalArgumentException if size is <= 0
79+ */
80+ public InflaterInputStream(InputStream in, Inflater inf, int size) {
81+ super(in);
82+ if (in == null || inf == null) {
83+ throw new NullPointerException();
84+ } else if (size <= 0) {
85+ throw new IllegalArgumentException("buffer size <= 0");
86+ }
87+ this.inf = inf;
88+ buf = new byte[size];
89+ }
90+
91+ /**
92+ * Creates a new input stream with the specified decompressor and a
93+ * default buffer size.
94+ * @param in the input stream
95+ * @param inf the decompressor ("inflater")
96+ */
97+ public InflaterInputStream(InputStream in, Inflater inf) {
98+ this(in, inf, 512);
99+ }
100+
101+ boolean usesDefaultInflater = false;
102+
103+ /**
104+ * Creates a new input stream with a default decompressor and buffer size.
105+ * @param in the input stream
106+ */
107+ public InflaterInputStream(InputStream in) {
108+ this(in, new Inflater());
109+ usesDefaultInflater = true;
110+ }
111+
112+ private byte[] singleByteBuf = new byte[1];
113+
114+ /**
115+ * Reads a byte of uncompressed data. This method will block until
116+ * enough input is available for decompression.
117+ * @return the byte read, or -1 if end of compressed input is reached
118+ * @exception IOException if an I/O error has occurred
119+ */
120+ public int read() throws IOException {
121+ ensureOpen();
122+ return read(singleByteBuf, 0, 1) == -1 ? -1 : singleByteBuf[0] & 0xff;
123+ }
124+
125+ /**
126+ * Reads uncompressed data into an array of bytes. If <code>len</code> is not
127+ * zero, the method will block until some input can be decompressed; otherwise,
128+ * no bytes are read and <code>0</code> is returned.
129+ * @param b the buffer into which the data is read
130+ * @param off the start offset in the destination array <code>b</code>
131+ * @param len the maximum number of bytes read
132+ * @return the actual number of bytes read, or -1 if the end of the
133+ * compressed input is reached or a preset dictionary is needed
134+ * @exception NullPointerException If <code>b</code> is <code>null</code>.
135+ * @exception IndexOutOfBoundsException If <code>off</code> is negative,
136+ * <code>len</code> is negative, or <code>len</code> is greater than
137+ * <code>b.length - off</code>
138+ * @exception ZipException if a ZIP format error has occurred
139+ * @exception IOException if an I/O error has occurred
140+ */
141+ public int read(byte[] b, int off, int len) throws IOException {
142+ ensureOpen();
143+ if (b == null) {
144+ throw new NullPointerException();
145+ } else if (off < 0 || len < 0 || len > b.length - off) {
146+ throw new IndexOutOfBoundsException();
147+ } else if (len == 0) {
148+ return 0;
149+ }
150+ try {
151+ int n;
152+ while ((n = inf.inflate(b, off, len)) == 0) {
153+ if (inf.finished() || inf.needsDictionary()) {
154+ reachEOF = true;
155+ return -1;
156+ }
157+ if (inf.needsInput()) {
158+ fill();
159+ }
160+ }
161+ return n;
162+ } catch (DataFormatException e) {
163+ String s = e.getMessage();
164+ throw new ZipException(s != null ? s : "Invalid ZLIB data format");
165+ }
166+ }
167+
168+ /**
169+ * Returns 0 after EOF has been reached, otherwise always return 1.
170+ * <p>
171+ * Programs should not count on this method to return the actual number
172+ * of bytes that could be read without blocking.
173+ *
174+ * @return 1 before EOF and 0 after EOF.
175+ * @exception IOException if an I/O error occurs.
176+ *
177+ */
178+ public int available() throws IOException {
179+ ensureOpen();
180+ if (reachEOF) {
181+ return 0;
182+ } else {
183+ return 1;
184+ }
185+ }
186+
187+ private byte[] b = new byte[512];
188+
189+ /**
190+ * Skips specified number of bytes of uncompressed data.
191+ * @param n the number of bytes to skip
192+ * @return the actual number of bytes skipped.
193+ * @exception IOException if an I/O error has occurred
194+ * @exception IllegalArgumentException if n < 0
195+ */
196+ public long skip(long n) throws IOException {
197+ if (n < 0) {
198+ throw new IllegalArgumentException("negative skip length");
199+ }
200+ ensureOpen();
201+ int max = (int)Math.min(n, Integer.MAX_VALUE);
202+ int total = 0;
203+ while (total < max) {
204+ int len = max - total;
205+ if (len > b.length) {
206+ len = b.length;
207+ }
208+ len = read(b, 0, len);
209+ if (len == -1) {
210+ reachEOF = true;
211+ break;
212+ }
213+ total += len;
214+ }
215+ return total;
216+ }
217+
218+ /**
219+ * Closes this input stream and releases any system resources associated
220+ * with the stream.
221+ * @exception IOException if an I/O error has occurred
222+ */
223+ public void close() throws IOException {
224+ if (!closed) {
225+ if (usesDefaultInflater)
226+ inf.end();
227+ in.close();
228+ closed = true;
229+ }
230+ }
231+
232+ /**
233+ * Fills input buffer with more data to decompress.
234+ * @exception IOException if an I/O error has occurred
235+ */
236+ protected void fill() throws IOException {
237+ ensureOpen();
238+ len = in.read(buf, 0, buf.length);
239+ if (len == -1) {
240+ throw new EOFException("Unexpected end of ZLIB input stream");
241+ }
242+ inf.setInput(buf, 0, len);
243+ }
244+
245+ /**
246+ * Tests if this input stream supports the <code>mark</code> and
247+ * <code>reset</code> methods. The <code>markSupported</code>
248+ * method of <code>InflaterInputStream</code> returns
249+ * <code>false</code>.
250+ *
251+ * @return a <code>boolean</code> indicating if this stream type supports
252+ * the <code>mark</code> and <code>reset</code> methods.
253+ * @see java.io.InputStream#mark(int)
254+ * @see java.io.InputStream#reset()
255+ */
256+ public boolean markSupported() {
257+ return false;
258+ }
259+
260+ /**
261+ * Marks the current position in this input stream.
262+ *
263+ * <p> The <code>mark</code> method of <code>InflaterInputStream</code>
264+ * does nothing.
265+ *
266+ * @param readlimit the maximum limit of bytes that can be read before
267+ * the mark position becomes invalid.
268+ * @see java.io.InputStream#reset()
269+ */
270+ public synchronized void mark(int readlimit) {
271+ }
272+
273+ /**
274+ * Repositions this stream to the position at the time the
275+ * <code>mark</code> method was last called on this input stream.
276+ *
277+ * <p> The method <code>reset</code> for class
278+ * <code>InflaterInputStream</code> does nothing except throw an
279+ * <code>IOException</code>.
280+ *
281+ * @exception IOException if this method is invoked.
282+ * @see java.io.InputStream#mark(int)
283+ * @see java.io.IOException
284+ */
285+ public synchronized void reset() throws IOException {
286+ throw new IOException("mark/reset not supported");
287+ }
288+}