1 /*
2 * Copyright (c) 1996, 2012, 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.SequenceInputStream;
29 import java.io.ByteArrayInputStream;
30 import java.io.InputStream;
31 import java.io.IOException;
32 import java.io.EOFException;
33
34 /**
35 * This class implements a stream filter for reading compressed data in
36 * the GZIP file format.
37 *
38 * @see InflaterInputStream
39 * @author David Connelly
40 *
41 */
42 public
43 class GZIPInputStream extends InflaterInputStream {
44 /**
45 * CRC-32 for uncompressed data.
46 */
47 protected CRC32 crc = new CRC32();
48
49 /**
195 int v = (int)crc.getValue() & 0xffff;
196 if (readUShort(in) != v) {
197 throw new ZipException("Corrupt GZIP header");
198 }
199 n += 2;
200 }
201 crc.reset();
202 return n;
203 }
204
205 /*
206 * Reads GZIP member trailer and returns true if the eos
207 * reached, false if there are more (concatenated gzip
208 * data set)
209 */
210 private boolean readTrailer() throws IOException {
211 InputStream in = this.in;
212 int n = inf.getRemaining();
213 if (n > 0) {
214 in = new SequenceInputStream(
215 new ByteArrayInputStream(buf, len - n, n), in);
216 }
217 // Uses left-to-right evaluation order
218 if ((readUInt(in) != crc.getValue()) ||
219 // rfc1952; ISIZE is the input size modulo 2^32
220 (readUInt(in) != (inf.getBytesWritten() & 0xffffffffL)))
221 throw new ZipException("Corrupt GZIP trailer");
222
223 // If there are more bytes available in "in" or
224 // the leftover in the "inf" is > 26 bytes:
225 // this.trailer(8) + next.header.min(10) + next.trailer(8)
226 // try concatenated case
227 if (this.in.available() > 0 || n > 26) {
228 int m = 8; // this.trailer
229 try {
230 m += readHeader(in); // next.header
231 } catch (IOException ze) {
232 return true; // ignore any malformed, do nothing
233 }
234 inf.reset();
235 if (n > m)
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1 /*
2 * Copyright (c) 1996, 2013, 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.SequenceInputStream;
29 import java.io.ByteArrayInputStream;
30 import java.io.FilterInputStream;
31 import java.io.InputStream;
32 import java.io.IOException;
33 import java.io.EOFException;
34
35 /**
36 * This class implements a stream filter for reading compressed data in
37 * the GZIP file format.
38 *
39 * @see InflaterInputStream
40 * @author David Connelly
41 *
42 */
43 public
44 class GZIPInputStream extends InflaterInputStream {
45 /**
46 * CRC-32 for uncompressed data.
47 */
48 protected CRC32 crc = new CRC32();
49
50 /**
196 int v = (int)crc.getValue() & 0xffff;
197 if (readUShort(in) != v) {
198 throw new ZipException("Corrupt GZIP header");
199 }
200 n += 2;
201 }
202 crc.reset();
203 return n;
204 }
205
206 /*
207 * Reads GZIP member trailer and returns true if the eos
208 * reached, false if there are more (concatenated gzip
209 * data set)
210 */
211 private boolean readTrailer() throws IOException {
212 InputStream in = this.in;
213 int n = inf.getRemaining();
214 if (n > 0) {
215 in = new SequenceInputStream(
216 new ByteArrayInputStream(buf, len - n, n),
217 new FilterInputStream(in) {
218 public void close() throws IOException {}
219 });
220 }
221 // Uses left-to-right evaluation order
222 if ((readUInt(in) != crc.getValue()) ||
223 // rfc1952; ISIZE is the input size modulo 2^32
224 (readUInt(in) != (inf.getBytesWritten() & 0xffffffffL)))
225 throw new ZipException("Corrupt GZIP trailer");
226
227 // If there are more bytes available in "in" or
228 // the leftover in the "inf" is > 26 bytes:
229 // this.trailer(8) + next.header.min(10) + next.trailer(8)
230 // try concatenated case
231 if (this.in.available() > 0 || n > 26) {
232 int m = 8; // this.trailer
233 try {
234 m += readHeader(in); // next.header
235 } catch (IOException ze) {
236 return true; // ignore any malformed, do nothing
237 }
238 inf.reset();
239 if (n > m)
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