01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * Resin Open Source is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 2 of the License, or
12: * (at your option) any later version.
13: *
14: * Resin Open Source is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17: * of NON-INFRINGEMENT. See the GNU General Public License for more
18: * details.
19: *
20: * You should have received a copy of the GNU General Public License
21: * along with Resin Open Source; if not, write to the
22: *
23: * Free Software Foundation, Inc.
24: * 59 Temple Place, Suite 330
25: * Boston, MA 02111-1307 USA
26: *
27: * @author Nam Nguyen
28: */
29:
30: package com.caucho.quercus.lib.zlib;
31:
32: import com.caucho.quercus.QuercusModuleException;
33: import com.caucho.quercus.env.Env;
34: import com.caucho.quercus.lib.file.BinaryInput;
35: import com.caucho.quercus.lib.file.ReadStreamInput;
36: import com.caucho.vfs.*;
37:
38: import java.io.IOException;
39:
40: /**
41: * Input from a compressed stream.
42: *
43: *
44: */
45: public class ZlibInputStream extends ReadStreamInput {
46: private BinaryInput _in;
47: private GZInputStream _gzIn;
48:
49: public ZlibInputStream(BinaryInput in) throws IOException {
50: super (Env.getInstance());
51:
52: init(in);
53: }
54:
55: protected void init(BinaryInput in) throws IOException {
56: _in = in;
57:
58: _gzIn = new GZInputStream(in.getInputStream());
59: ReadStream rs = new ReadStream(new VfsStream(_gzIn, null));
60:
61: init(rs);
62: }
63:
64: /**
65: * Opens a new copy.
66: */
67: public BinaryInput openCopy() throws IOException {
68: return new ZlibInputStream(_in.openCopy());
69: }
70:
71: /**
72: * Sets the position.
73: */
74: public boolean setPosition(long offset) {
75: try {
76: BinaryInput newIn = _in.openCopy();
77:
78: _gzIn.close();
79: getInputStream().close();
80:
81: init(newIn);
82:
83: if (offset > 0)
84: skip(offset);
85:
86: return true;
87: } catch (IOException e) {
88: throw new QuercusModuleException(e);
89: }
90: }
91:
92: public String toString() {
93: return "ZlibInputStream[]";
94: }
95: }
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