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Diffstat (limited to '')
-rw-r--r-- | OpenSim/Region/Environment/Modules/World/Archiver/TarArchiveReader.cs | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/OpenSim/Region/Environment/Modules/World/Archiver/TarArchiveReader.cs b/OpenSim/Region/Environment/Modules/World/Archiver/TarArchiveReader.cs new file mode 100644 index 0000000..e785c6c --- /dev/null +++ b/OpenSim/Region/Environment/Modules/World/Archiver/TarArchiveReader.cs | |||
@@ -0,0 +1,108 @@ | |||
1 | /* | ||
2 | * Copyright (c) Contributors, http://opensimulator.org/ | ||
3 | * See CONTRIBUTORS.TXT for a full list of copyright holders. | ||
4 | * | ||
5 | * Redistribution and use in source and binary forms, with or without | ||
6 | * modification, are permitted provided that the following conditions are met: | ||
7 | * * Redistributions of source code must retain the above copyright | ||
8 | * notice, this list of conditions and the following disclaimer. | ||
9 | * * Redistributions in binary form must reproduce the above copyright | ||
10 | * notice, this list of conditions and the following disclaimer in the | ||
11 | * documentation and/or other materials provided with the distribution. | ||
12 | * * Neither the name of the OpenSim Project nor the | ||
13 | * names of its contributors may be used to endorse or promote products | ||
14 | * derived from this software without specific prior written permission. | ||
15 | * | ||
16 | * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY | ||
17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
19 | * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY | ||
20 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
21 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | ||
23 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
25 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
26 | */ | ||
27 | |||
28 | using System; | ||
29 | using System.IO; | ||
30 | //using System.Reflection; | ||
31 | //using log4net; | ||
32 | |||
33 | namespace OpenSim.Region.Environment.Modules.World.Archiver | ||
34 | { | ||
35 | /// <summary> | ||
36 | /// Temporary code to do the bare minimum required to read a tar archive for our purposes | ||
37 | /// </summary> | ||
38 | public class TarArchiveReader | ||
39 | { | ||
40 | // private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); | ||
41 | |||
42 | protected static System.Text.ASCIIEncoding m_asciiEncoding = new System.Text.ASCIIEncoding(); | ||
43 | |||
44 | /// <summary> | ||
45 | /// Binary reader for the underlying stream | ||
46 | /// </summary> | ||
47 | protected BinaryReader m_br; | ||
48 | |||
49 | public TarArchiveReader(string archivePath) | ||
50 | { | ||
51 | m_br = new BinaryReader(new FileStream(archivePath, FileMode.Open)); | ||
52 | } | ||
53 | |||
54 | public byte[] Read(out string filePath) | ||
55 | { | ||
56 | TarHeader header = ReadHeader(); | ||
57 | filePath = header.FilePath; | ||
58 | return m_br.ReadBytes(header.FileSize); | ||
59 | } | ||
60 | |||
61 | /// <summary> | ||
62 | /// Read the next 512 byte chunk of data as a tar header. | ||
63 | /// </summary> | ||
64 | /// <returns>A tar header struct</returns> | ||
65 | protected TarHeader ReadHeader() | ||
66 | { | ||
67 | TarHeader tarHeader = new TarHeader(); | ||
68 | |||
69 | byte[] header = m_br.ReadBytes(512); | ||
70 | |||
71 | tarHeader.FilePath = m_asciiEncoding.GetString(header, 0, 100); | ||
72 | tarHeader.FileSize = ConvertOctalBytesToDecimal(header, 124, 11); | ||
73 | |||
74 | return tarHeader; | ||
75 | } | ||
76 | |||
77 | public void Close() | ||
78 | { | ||
79 | m_br.Close(); | ||
80 | } | ||
81 | |||
82 | /// <summary> | ||
83 | /// Convert octal bytes to a decimal representation | ||
84 | /// </summary> | ||
85 | /// <param name="bytes"></param> | ||
86 | /// <returns></returns> | ||
87 | public static int ConvertOctalBytesToDecimal(byte[] bytes, int startIndex, int count) | ||
88 | { | ||
89 | string oString = m_asciiEncoding.GetString(bytes, startIndex, count); | ||
90 | |||
91 | int d = 0; | ||
92 | |||
93 | foreach (char c in oString) | ||
94 | { | ||
95 | d <<= 3; | ||
96 | d |= c - '0'; | ||
97 | } | ||
98 | |||
99 | return d; | ||
100 | } | ||
101 | } | ||
102 | |||
103 | public struct TarHeader | ||
104 | { | ||
105 | public string FilePath; | ||
106 | public int FileSize; | ||
107 | } | ||
108 | } | ||