source: s10k/CommonLibs/zlib-1.2.8/contrib/dotzlib/DotZLib/Inflater.cs@ 1154

Last change on this file since 1154 was 1096, checked in by s10k, 7 years ago

Added zlib, quazip, basicxmlsyntaxhighlighter, conditionalsemaphore and linenumberdisplay libraries. zlib and quazip are pre-compiled, but you can compile them yourself, just delete the dll files (or equivalent binary files to your OS)

File size: 3.7 KB
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1//
2// © Copyright Henrik Ravn 2004
3//
4// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
5// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6//
7
8using System;
9using System.Diagnostics;
10using System.Runtime.InteropServices;
11
12namespace DotZLib
13{
14
15 /// <summary>
16 /// Implements a data decompressor, using the inflate algorithm in the ZLib dll
17 /// </summary>
18 public class Inflater : CodecBase
19 {
20 #region Dll imports
21 [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
22 private static extern int inflateInit_(ref ZStream sz, string vs, int size);
23
24 [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
25 private static extern int inflate(ref ZStream sz, int flush);
26
27 [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
28 private static extern int inflateReset(ref ZStream sz);
29
30 [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
31 private static extern int inflateEnd(ref ZStream sz);
32 #endregion
33
34 /// <summary>
35 /// Constructs an new instance of the <c>Inflater</c>
36 /// </summary>
37 public Inflater() : base()
38 {
39 int retval = inflateInit_(ref _ztream, Info.Version, Marshal.SizeOf(_ztream));
40 if (retval != 0)
41 throw new ZLibException(retval, "Could not initialize inflater");
42
43 resetOutput();
44 }
45
46
47 /// <summary>
48 /// Adds more data to the codec to be processed.
49 /// </summary>
50 /// <param name="data">Byte array containing the data to be added to the codec</param>
51 /// <param name="offset">The index of the first byte to add from <c>data</c></param>
52 /// <param name="count">The number of bytes to add</param>
53 /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
54 public override void Add(byte[] data, int offset, int count)
55 {
56 if (data == null) throw new ArgumentNullException();
57 if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
58 if ((offset+count) > data.Length) throw new ArgumentException();
59
60 int total = count;
61 int inputIndex = offset;
62 int err = 0;
63
64 while (err >= 0 && inputIndex < total)
65 {
66 copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize));
67 err = inflate(ref _ztream, (int)FlushTypes.None);
68 if (err == 0)
69 while (_ztream.avail_out == 0)
70 {
71 OnDataAvailable();
72 err = inflate(ref _ztream, (int)FlushTypes.None);
73 }
74
75 inputIndex += (int)_ztream.total_in;
76 }
77 setChecksum( _ztream.adler );
78 }
79
80
81 /// <summary>
82 /// Finishes up any pending data that needs to be processed and handled.
83 /// </summary>
84 public override void Finish()
85 {
86 int err;
87 do
88 {
89 err = inflate(ref _ztream, (int)FlushTypes.Finish);
90 OnDataAvailable();
91 }
92 while (err == 0);
93 setChecksum( _ztream.adler );
94 inflateReset(ref _ztream);
95 resetOutput();
96 }
97
98 /// <summary>
99 /// Closes the internal zlib inflate stream
100 /// </summary>
101 protected override void CleanUp() { inflateEnd(ref _ztream); }
102
103
104 }
105}
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