228 lines
7.9 KiB
C#
228 lines
7.9 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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namespace OpenSim.Framework.Serialization
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{
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/// <summary>
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/// Temporary code to produce a tar archive in tar v7 format
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/// </summary>
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public class TarArchiveWriter
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{
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//private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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protected static ASCIIEncoding m_asciiEncoding = new ASCIIEncoding();
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protected static UTF8Encoding m_utf8Encoding = new UTF8Encoding();
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/// <summary>
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/// Binary writer for the underlying stream
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/// </summary>
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protected BinaryWriter m_bw;
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public TarArchiveWriter(Stream s)
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{
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m_bw = new BinaryWriter(s);
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}
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/// <summary>
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/// Write a directory entry to the tar archive. We can only handle one path level right now!
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/// </summary>
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/// <param name="dirName"></param>
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public void WriteDir(string dirName)
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{
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// Directories are signalled by a final /
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if (!dirName.EndsWith("/"))
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dirName += "/";
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WriteFile(dirName, new byte[0]);
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}
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/// <summary>
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/// Write a file to the tar archive
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/// </summary>
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/// <param name="filePath"></param>
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/// <param name="data"></param>
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public void WriteFile(string filePath, string data)
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{
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WriteFile(filePath, m_utf8Encoding.GetBytes(data));
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}
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/// <summary>
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/// Write a file to the tar archive
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/// </summary>
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/// <param name="filePath"></param>
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/// <param name="data"></param>
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public void WriteFile(string filePath, byte[] data)
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{
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if (filePath.Length > 100)
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WriteEntry("././@LongLink", m_asciiEncoding.GetBytes(filePath), 'L');
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char fileType;
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if (filePath.EndsWith("/"))
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{
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fileType = '5';
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}
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else
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{
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fileType = '0';
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}
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WriteEntry(filePath, data, fileType);
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}
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/// <summary>
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/// Finish writing the raw tar archive data to a stream. The stream will be closed on completion.
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/// </summary>
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/// <param name="s">Stream to which to write the data</param>
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/// <returns></returns>
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public void Close()
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{
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//m_log.Debug("[TAR ARCHIVE WRITER]: Writing final consecutive 0 blocks");
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// Write two consecutive 0 blocks to end the archive
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byte[] finalZeroPadding = new byte[1024];
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lock (m_bw)
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{
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m_bw.Write(finalZeroPadding);
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m_bw.Flush();
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m_bw.Close();
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}
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}
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public static byte[] ConvertDecimalToPaddedOctalBytes(int d, int padding)
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{
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string oString = "";
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while (d > 0)
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{
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oString = Convert.ToString((byte)'0' + d & 7) + oString;
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d >>= 3;
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}
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while (oString.Length < padding)
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{
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oString = "0" + oString;
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}
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byte[] oBytes = m_asciiEncoding.GetBytes(oString);
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return oBytes;
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}
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/// <summary>
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/// Write a particular entry
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/// </summary>
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/// <param name="filePath"></param>
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/// <param name="data"></param>
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/// <param name="fileType"></param>
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protected void WriteEntry(string filePath, byte[] data, char fileType)
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{
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byte[] header = new byte[512];
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// file path field (100)
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byte[] nameBytes = m_asciiEncoding.GetBytes(filePath);
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int nameSize = (nameBytes.Length >= 100) ? 100 : nameBytes.Length;
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Array.Copy(nameBytes, header, nameSize);
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// file mode (8)
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byte[] modeBytes = m_asciiEncoding.GetBytes("0000777");
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Array.Copy(modeBytes, 0, header, 100, 7);
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// owner user id (8)
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byte[] ownerIdBytes = m_asciiEncoding.GetBytes("0000764");
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Array.Copy(ownerIdBytes, 0, header, 108, 7);
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// group user id (8)
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byte[] groupIdBytes = m_asciiEncoding.GetBytes("0000764");
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Array.Copy(groupIdBytes, 0, header, 116, 7);
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// file size in bytes (12)
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int fileSize = data.Length;
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//m_log.DebugFormat("[TAR ARCHIVE WRITER]: File size of {0} is {1}", filePath, fileSize);
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byte[] fileSizeBytes = ConvertDecimalToPaddedOctalBytes(fileSize, 11);
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Array.Copy(fileSizeBytes, 0, header, 124, 11);
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// last modification time (12)
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byte[] lastModTimeBytes = m_asciiEncoding.GetBytes("11017037332");
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Array.Copy(lastModTimeBytes, 0, header, 136, 11);
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// entry type indicator (1)
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header[156] = m_asciiEncoding.GetBytes(new char[] { fileType })[0];
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Array.Copy(m_asciiEncoding.GetBytes("0000000"), 0, header, 329, 7);
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Array.Copy(m_asciiEncoding.GetBytes("0000000"), 0, header, 337, 7);
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// check sum for header block (8) [calculated last]
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Array.Copy(m_asciiEncoding.GetBytes(" "), 0, header, 148, 8);
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int checksum = 0;
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foreach (byte b in header)
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{
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checksum += b;
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}
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//m_log.DebugFormat("[TAR ARCHIVE WRITER]: Decimal header checksum is {0}", checksum);
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byte[] checkSumBytes = ConvertDecimalToPaddedOctalBytes(checksum, 6);
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Array.Copy(checkSumBytes, 0, header, 148, 6);
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header[154] = 0;
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lock (m_bw)
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{
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// Write out header
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m_bw.Write(header);
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// Write out data
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// An IOException occurs if we try to write out an empty array in Mono 2.6
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if (data.Length > 0)
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m_bw.Write(data);
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if (data.Length % 512 != 0)
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{
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int paddingRequired = 512 - (data.Length % 512);
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//m_log.DebugFormat("[TAR ARCHIVE WRITER]: Padding data with {0} bytes", paddingRequired);
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byte[] padding = new byte[paddingRequired];
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m_bw.Write(padding);
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}
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}
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}
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}
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}
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