// CoreUtil
// 
// Copyright (C) 2012-2014 Daiyuu Nobori. All Rights Reserved.
// Copyright (C) 2012-2014 SoftEther VPN Project at University of Tsukuba. All Rights Reserved.
// Comments: Tetsuo Sugiyama, Ph.D.
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// version 2 as published by the Free Software Foundation.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License version 2
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// 
// THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
// AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
// 
// 
// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
// UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
// MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
// SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
// SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
// CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
// DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
// MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
// SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
// EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
// JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
// AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
// THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
// 
// USE ONLY IN JAPAN. DO NOT USE IT IN OTHER COUNTRIES. IMPORTING THIS
// SOFTWARE INTO OTHER COUNTRIES IS AT YOUR OWN RISK. SOME COUNTRIES
// PROHIBIT ENCRYPTED COMMUNICATIONS. USING THIS SOFTWARE IN OTHER
// COUNTRIES MIGHT BE RESTRICTED.
// 
// 
// SOURCE CODE CONTRIBUTION
// ------------------------
// 
// Your contribution to SoftEther VPN Project is much appreciated.
// Please send patches to us through GitHub.
// Read the SoftEther VPN Patch Acceptance Policy in advance:
// http://www.softether.org/5-download/src/9.patch
// 
// 
// DEAR SECURITY EXPERTS
// ---------------------
// 
// If you find a bug or a security vulnerability please kindly inform us
// about the problem immediately so that we can fix the security problem
// to protect a lot of users around the world as soon as possible.
// 
// Our e-mail address for security reports is:
// softether-vpn-security [at] softether.org
// 
// Please note that the above e-mail address is not a technical support
// inquiry address. If you need technical assistance, please visit
// http://www.softether.org/ and ask your question on the users forum.
// 
// Thank you for your cooperation.
// 
// 
// NO MEMORY OR RESOURCE LEAKS
// ---------------------------
// 
// The memory-leaks and resource-leaks verification under the stress
// test has been passed before release this source code.


using System;
using System.Threading;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Text;
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Runtime.InteropServices;

namespace CoreUtil
{
	[StructLayout(LayoutKind.Sequential, Pack = 1)]
	public struct TarHeader
	{
		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 100)]
		public byte[] Name;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
		public byte[] Mode;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
		public byte[] UID;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
		public byte[] GID;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
		public byte[] Size;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
		public byte[] MTime;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
		public byte[] CheckSum;

		public byte TypeFlag;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 100)]
		public byte[] LinkName;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
		public byte[] Magic;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
		public byte[] Version;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
		public byte[] UName;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
		public byte[] GName;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
		public byte[] DevMajor;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
		public byte[] DevMinor;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 155)]
		public byte[] Prefix;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
		public byte[] Padding;

		public TarHeader(bool dummy)
		{
			this.Name = new byte[100];
			this.Mode = new byte[8];
			this.UID = new byte[8];
			this.GID = new byte[8];
			this.Size = new byte[12];
			this.MTime = new byte[12];
			this.CheckSum = new byte[8];
			this.LinkName = new byte[100];
			this.Magic = new byte[6];
			this.Version = new byte[2];
			this.UName = new byte[32];
			this.GName = new byte[32];
			this.DevMajor = new byte[8];
			this.DevMinor = new byte[8];
			this.Prefix = new byte[155];
			this.Padding = new byte[12];
			this.TypeFlag = 0;

			this.Version[0] = 0x20;
			this.Version[1] = 0x00;

			byte[] data = Str.ShiftJisEncoding.GetBytes("ustar ");
			Util.CopyByte(this.Magic, 0, data, 0, 6);
		}

		public void SetName(string name, Encoding encoding)
		{
			byte[] data = encoding.GetBytes(name);
			if (data.Length <= 100)
			{
				Util.CopyByte(this.Name, 0, data, 0, data.Length);
			}
			else
			{
				Util.CopyByte(this.Name, 0, data, 0, 100);
				Util.CopyByte(this.Prefix, 0, data, 100, data.Length - 100);
			}
		}

		public void SetMode(string str)
		{
			StrToByteArray(this.Mode, str);
		}

		public void SetUID(string str)
		{
			StrToByteArray(this.UID, str);
		}

		public void SetGID(string str)
		{
			StrToByteArray(this.GID, str);
		}

		public void SetSize(long size)
		{
			if (size >= 0x1FFFFFFFF || size < 0)
			{
				throw new InvalidDataException("size");
			}
			StrToByteArray(this.Size, Str.AppendZeroToNumString(Convert.ToString(size, 8), 11));
		}

		public void SetMTime(DateTime dt)
		{
			uint t = Util.DateTimeToUnixTime(dt.ToUniversalTime());

			StrToByteArray(this.MTime, Str.AppendZeroToNumString(Convert.ToString(t, 8), 11));
		}

		public void CalcChecksum()
		{
			TarHeader h2 = this;
			Array.Clear(h2.CheckSum, 0, h2.CheckSum.Length);
			byte[] data = Util.StructToByte(h2);
			SetChecksum(data);
		}

		public void SetChecksum(byte[] data)
		{
			ulong sum = 0;
			int i;
			for (i = 0; i < data.Length; i++)
			{
				sum += (ulong)data[i];
			}

			sum += 0x100;

			StrToByteArray(this.CheckSum, Str.AppendZeroToNumString(Convert.ToString((long)sum, 8), 6));
			this.CheckSum[7] = 0x20;
		}

		public void SetTypeFlag(int flag)
		{
			this.TypeFlag = (byte)flag.ToString()[0];
		}

		public void SetUName(string str)
		{
			StrToByteArray(this.UName, str);
		}

		public void SetGName(string str)
		{
			StrToByteArray(this.GName, str);
		}

		public static void StrToByteArray(byte[] dst, string str)
		{
			Encoding e = Str.ShiftJisEncoding;

			byte[] d = e.GetBytes(str);

			Array.Clear(dst, 0, dst.Length);
			Util.CopyByte(dst, 0, d, 0, Math.Min(d.Length, dst.Length - 1));
		}
	}

	public static class TarUtil
	{
        public static TarHeader CreateTarHeader(string name, Encoding encoding, int type, long size, DateTime dt)
        {
            return CreateTarHeader(name, encoding, type, size, dt, "0000777");
        }

		public static TarHeader CreateTarHeader(string name, Encoding encoding, int type, long size, DateTime dt, string mode)
		{
			TarHeader h = new TarHeader(false);

			h.SetName(name, encoding);

			h.SetMode(mode);
			h.SetMTime(dt);
			h.SetName(name, encoding);
			h.SetSize(size);
			h.SetTypeFlag(type);
			h.SetGID("0000000");
			h.SetUID("0000000");

			h.CalcChecksum();

			return h;
		}
	}

	public class TarPacker
	{
		Fifo fifo;
		Dictionary<string, int> dirList;
		Encoding encoding;

		public TarPacker()
			: this(Str.ShiftJisEncoding)
		{
		}
		public TarPacker(Encoding encoding)
		{
			fifo = new Fifo();
			dirList = new Dictionary<string, int>(new StrEqualityComparer(true));
			this.encoding = encoding;
		}

        public void AddDirectory(string name, DateTime dt, string mode)
        {
            name = name.Replace('\\', '/');
            if (name.EndsWith("/") == false)
            {
                name = name + "/";
            }

            if (dirList.ContainsKey(name) == false)
            {
                TarHeader h = TarUtil.CreateTarHeader(name, encoding, 5, 0, dt, mode);
                fifo.Write(Util.StructToByte(h));

                dirList.Add(name, 0);
            }
        }

		public void AddDirectory(string name, DateTime dt)
		{
            AddDirectory(name, dt, "0000777");
		}

		long currentFileSize = 0;
		long currentPos = 0;

        public void AddFileSimple(string name, byte[] data, int pos, int len, DateTime dt)
        {
            AddFileSimple(name, data, pos, len, dt, "0000777", "0000777");
        }

		public void AddFileSimple(string name, byte[] data, int pos, int len, DateTime dt, string directory_mode, string mode)
		{
			AddFileStart(name, len, dt, directory_mode, mode);
			AddFileData(data, pos, len);
		}

        public void AddFileStart(string name, long size, DateTime dt)
        {
            AddFileStart(name, size, dt, "0000777", "0000777");
        }

		public void AddFileStart(string name, long size, DateTime dt, string directory_mode, string mode)
		{
			if (currentFileSize != 0 || currentPos != 0)
			{
				throw new ApplicationException("last file not completed.");
			}

			name = name.Replace('\\', '/');
			if (Str.InStr(name, "/", true))
			{
                AddDirectory(Path.GetDirectoryName(name), dt, directory_mode);
			}

			TarHeader h = TarUtil.CreateTarHeader(name, encoding, 0, size, dt, mode);
			fifo.Write(Util.StructToByte(h));

			currentFileSize = size;
			currentPos = 0;
		}

		public void AddFileData(byte[] data, int pos, int len)
		{
			long totalSize = currentPos + len;

			if (totalSize > currentFileSize)
			{
				throw new ApplicationException("totalSize > currentFileSize");
			}

			fifo.Write(data, pos, len);

			currentPos += len;
			if (currentPos >= currentFileSize)
			{
				long padding = ((currentFileSize + 511) / 512) * 512 - currentFileSize;

				byte[] pad = new byte[padding];
				Array.Clear(pad, 0, pad.Length);
				fifo.Write(pad, 0, pad.Length);

				currentFileSize = 0;
				currentPos = 0;
			}
		}

		public Fifo GeneratedData
		{
			get
			{
				return this.fifo;
			}
		}

		public void Finish()
		{
			byte[] data = new byte[1024];
			Array.Clear(data, 0, data.Length);

			fifo.Write(data);
		}

		public byte[] CompressToGZip()
		{
			GZipPacker g = new GZipPacker();
			byte[] data = this.fifo.Read();

			g.Write(data, 0, data.Length, true);

			return g.GeneratedData.Read();
		}
	}
}

// Developed by SoftEther VPN Project at University of Tsukuba in Japan.
// Department of Computer Science has dozens of overly-enthusiastic geeks.
// Join us: http://www.tsukuba.ac.jp/english/admission/
