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
|
/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSim Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.IO;
//using System.Reflection;
//using log4net;
namespace OpenSim.Region.Environment.Modules.World.Archiver
{
/// <summary>
/// Temporary code to do the bare minimum required to read a tar archive for our purposes
/// </summary>
public class TarArchiveReader
{
// private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
protected static System.Text.ASCIIEncoding m_asciiEncoding = new System.Text.ASCIIEncoding();
/// <summary>
/// Binary reader for the underlying stream
/// </summary>
protected BinaryReader m_br;
public TarArchiveReader(string archivePath)
{
m_br = new BinaryReader(new FileStream(archivePath, FileMode.Open));
}
public byte[] Read(out string filePath)
{
TarHeader header = ReadHeader();
filePath = header.FilePath;
return m_br.ReadBytes(header.FileSize);
}
/// <summary>
/// Read the next 512 byte chunk of data as a tar header.
/// </summary>
/// <returns>A tar header struct</returns>
protected TarHeader ReadHeader()
{
TarHeader tarHeader = new TarHeader();
byte[] header = m_br.ReadBytes(512);
tarHeader.FilePath = m_asciiEncoding.GetString(header, 0, 100);
tarHeader.FileSize = ConvertOctalBytesToDecimal(header, 124, 11);
return tarHeader;
}
public void Close()
{
m_br.Close();
}
/// <summary>
/// Convert octal bytes to a decimal representation
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
public static int ConvertOctalBytesToDecimal(byte[] bytes, int startIndex, int count)
{
string oString = m_asciiEncoding.GetString(bytes, startIndex, count);
int d = 0;
foreach (char c in oString)
{
d <<= 3;
d |= c - '0';
}
return d;
}
}
public struct TarHeader
{
public string FilePath;
public int FileSize;
}
}
|
