corrade-vassal – Rev 1
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/*
* Copyright (c) 2006-2014, openmetaverse.org
* All rights reserved.
*
* - 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.
* - Neither the name of the openmetaverse.org 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR 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.Collections.Generic;
using System.IO;
using System.Text;
namespace OpenMetaverse.Assets
{
/// <summary>
/// Temporary code to produce a tar archive in tar v7 format
/// </summary>
public class TarArchiveWriter
{
protected static ASCIIEncoding m_asciiEncoding = new ASCIIEncoding();
/// <summary>
/// Binary writer for the underlying stream
/// </summary>
protected BinaryWriter m_bw;
public TarArchiveWriter(Stream s)
{
m_bw = new BinaryWriter(s);
}
/// <summary>
/// Write a directory entry to the tar archive. We can only handle one path level right now!
/// </summary>
/// <param name="dirName"></param>
public void WriteDir(string dirName)
{
// Directories are signalled by a final /
if (!dirName.EndsWith("/"))
dirName += "/";
WriteFile(dirName, new byte[0]);
}
/// <summary>
/// Write a file to the tar archive
/// </summary>
/// <param name="filePath"></param>
/// <param name="data"></param>
public void WriteFile(string filePath, string data)
{
WriteFile(filePath, m_asciiEncoding.GetBytes(data));
}
/// <summary>
/// Write a file to the tar archive
/// </summary>
/// <param name="filePath"></param>
/// <param name="data"></param>
public void WriteFile(string filePath, byte[] data)
{
if (filePath.Length > 100)
WriteEntry("././@LongLink", m_asciiEncoding.GetBytes(filePath), 'L');
char fileType;
if (filePath.EndsWith("/"))
{
fileType = '5';
}
else
{
fileType = '0';
}
WriteEntry(filePath, data, fileType);
}
/// <summary>
/// Finish writing the raw tar archive data to a stream. The stream will be closed on completion.
/// </summary>
public void Close()
{
//m_log.Debug("[TAR ARCHIVE WRITER]: Writing final consecutive 0 blocks");
// Write two consecutive 0 blocks to end the archive
byte[] finalZeroPadding = new byte[1024];
m_bw.Write(finalZeroPadding);
m_bw.Flush();
m_bw.Close();
}
public static byte[] ConvertDecimalToPaddedOctalBytes(int d, int padding)
{
string oString = "";
while (d > 0)
{
oString = Convert.ToString((byte)'0' + d & 7) + oString;
d >>= 3;
}
while (oString.Length < padding)
{
oString = "0" + oString;
}
byte[] oBytes = m_asciiEncoding.GetBytes(oString);
return oBytes;
}
/// <summary>
/// Write a particular entry
/// </summary>
/// <param name="filePath"></param>
/// <param name="data"></param>
/// <param name="fileType"></param>
protected void WriteEntry(string filePath, byte[] data, char fileType)
{
byte[] header = new byte[512];
// file path field (100)
byte[] nameBytes = m_asciiEncoding.GetBytes(filePath);
int nameSize = (nameBytes.Length >= 100) ? 100 : nameBytes.Length;
Array.Copy(nameBytes, header, nameSize);
// file mode (8)
byte[] modeBytes = m_asciiEncoding.GetBytes("0000777");
Array.Copy(modeBytes, 0, header, 100, 7);
// owner user id (8)
byte[] ownerIdBytes = m_asciiEncoding.GetBytes("0000764");
Array.Copy(ownerIdBytes, 0, header, 108, 7);
// group user id (8)
byte[] groupIdBytes = m_asciiEncoding.GetBytes("0000764");
Array.Copy(groupIdBytes, 0, header, 116, 7);
// file size in bytes (12)
int fileSize = data.Length;
//m_log.DebugFormat("[TAR ARCHIVE WRITER]: File size of {0} is {1}", filePath, fileSize);
byte[] fileSizeBytes = ConvertDecimalToPaddedOctalBytes(fileSize, 11);
Array.Copy(fileSizeBytes, 0, header, 124, 11);
// last modification time (12)
byte[] lastModTimeBytes = m_asciiEncoding.GetBytes("11017037332");
Array.Copy(lastModTimeBytes, 0, header, 136, 11);
// entry type indicator (1)
header[156] = m_asciiEncoding.GetBytes(new char[] { fileType })[0];
Array.Copy(m_asciiEncoding.GetBytes("0000000"), 0, header, 329, 7);
Array.Copy(m_asciiEncoding.GetBytes("0000000"), 0, header, 337, 7);
// check sum for header block (8) [calculated last]
Array.Copy(m_asciiEncoding.GetBytes(" "), 0, header, 148, 8);
int checksum = 0;
foreach (byte b in header)
{
checksum += b;
}
//m_log.DebugFormat("[TAR ARCHIVE WRITER]: Decimal header checksum is {0}", checksum);
byte[] checkSumBytes = ConvertDecimalToPaddedOctalBytes(checksum, 6);
Array.Copy(checkSumBytes, 0, header, 148, 6);
header[154] = 0;
// Write out header
m_bw.Write(header);
// Write out data
m_bw.Write(data);
if (data.Length % 512 != 0)
{
int paddingRequired = 512 - (data.Length % 512);
//m_log.DebugFormat("[TAR ARCHIVE WRITER]: Padding data with {0} bytes", paddingRequired);
byte[] padding = new byte[paddingRequired];
m_bw.Write(padding);
}
}
}
}