1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/* -*- Mode: csharp; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
//
// GZipStream.cs
//
// Authors:
// Christopher James Lahey <clahey@ximian.com>
// Gonzalo Paniagua Javier <gonzalo@novell.com>
//
// Copyright (C) 2004-2010 Novell, Inc (http://www.novell.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Remoting.Messaging;
namespace System.IO.Compression {
public class GZipStream : Stream
{
private DeflateStream deflateStream;
public GZipStream (Stream compressedStream, CompressionMode mode) :
this (compressedStream, mode, false) {
}
public GZipStream (Stream compressedStream, CompressionMode mode, bool leaveOpen) {
this.deflateStream = new DeflateStream (compressedStream, mode, leaveOpen, true);
}
#if NET_4_5
public GZipStream (Stream stream, CompressionLevel compressionLevel)
: this (stream, compressionLevel, false)
{
}
public GZipStream (Stream stream, CompressionLevel compressionLevel, bool leaveOpen)
{
this.deflateStream = new DeflateStream (stream, compressionLevel, leaveOpen, true);
}
#endif
protected override void Dispose (bool disposing)
{
if (disposing) {
if (deflateStream != null) {
deflateStream.Dispose ();
deflateStream = null;
}
}
base.Dispose (disposing);
}
public override int Read (byte[] dest, int dest_offset, int count)
{
if (deflateStream == null)
throw new ObjectDisposedException (GetType ().FullName);
return deflateStream.Read(dest, dest_offset, count);
}
public override void Write (byte[] src, int src_offset, int count)
{
if (deflateStream == null)
throw new ObjectDisposedException (GetType ().FullName);
deflateStream.Write (src, src_offset, count);
}
public override void Flush()
{
if (deflateStream == null)
throw new ObjectDisposedException (GetType ().FullName);
deflateStream.Flush();
}
public override long Seek (long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength (long value)
{
throw new NotSupportedException();
}
public override IAsyncResult BeginRead (byte [] buffer, int offset, int count,
AsyncCallback cback, object state)
{
if (deflateStream == null)
throw new ObjectDisposedException (GetType ().FullName);
return deflateStream.BeginRead (buffer, offset, count, cback, state);
}
public override IAsyncResult BeginWrite (byte [] buffer, int offset, int count,
AsyncCallback cback, object state)
{
if (deflateStream == null)
throw new ObjectDisposedException (GetType ().FullName);
return deflateStream.BeginWrite (buffer, offset, count, cback, state);
}
public override int EndRead(IAsyncResult async_result) {
if (deflateStream == null)
throw new ObjectDisposedException (GetType ().FullName);
return deflateStream.EndRead (async_result);
}
public override void EndWrite (IAsyncResult async_result)
{
if (deflateStream == null)
throw new ObjectDisposedException (GetType ().FullName);
deflateStream.EndWrite (async_result);
}
public Stream BaseStream {
get {
if (deflateStream == null)
return null;
return deflateStream.BaseStream;
}
}
public override bool CanRead {
get {
if (deflateStream == null)
return false;
return deflateStream.CanRead;
}
}
public override bool CanSeek {
get {
if (deflateStream == null)
return false;
return deflateStream.CanSeek;
}
}
public override bool CanWrite {
get {
if (deflateStream == null)
return false;
return deflateStream.CanWrite;
}
}
public override long Length {
get { throw new NotSupportedException(); }
}
public override long Position {
get { throw new NotSupportedException(); }
set { throw new NotSupportedException(); }
}
}
}
|
