merge common implementations and server implementations

Emby.Server.Implementations/IO/SharpCifs/Netbios/SessionServicePacket.cs

@@ -0,0 +1,156 @@
+// This code is derived from jcifs smb client library <jcifs at samba dot org>
+// Ported by J. Arturo <webmaster at komodosoft dot net>
+//  
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// 
+// This library 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
+// Lesser General Public License for more details.
+// 
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+using System.IO;
+using SharpCifs.Util.Sharpen;
+
+namespace SharpCifs.Netbios
+{
+	public abstract class SessionServicePacket
+	{
+		internal const int SessionMessage = unchecked(0x00);
+
+		internal const int SessionRequest = unchecked(0x81);
+
+		public const int PositiveSessionResponse = unchecked(0x82);
+
+		public const int NegativeSessionResponse = unchecked(0x83);
+
+		internal const int SessionRetargetResponse = unchecked(0x84);
+
+		internal const int SessionKeepAlive = unchecked(0x85);
+
+		internal const int MaxMessageSize = unchecked(0x0001FFFF);
+
+		internal const int HeaderLength = 4;
+
+		// session service packet types 
+		internal static void WriteInt2(int val, byte[] dst, int dstIndex)
+		{
+			dst[dstIndex++] = unchecked((byte)((val >> 8) & unchecked(0xFF)));
+			dst[dstIndex] = unchecked((byte)(val & unchecked(0xFF)));
+		}
+
+		internal static void WriteInt4(int val, byte[] dst, int dstIndex)
+		{
+			dst[dstIndex++] = unchecked((byte)((val >> 24) & unchecked(0xFF)));
+			dst[dstIndex++] = unchecked((byte)((val >> 16) & unchecked(0xFF)));
+			dst[dstIndex++] = unchecked((byte)((val >> 8) & unchecked(0xFF)));
+			dst[dstIndex] = unchecked((byte)(val & unchecked(0xFF)));
+		}
+
+		internal static int ReadInt2(byte[] src, int srcIndex)
+		{
+			return ((src[srcIndex] & unchecked(0xFF)) << 8) + (src[srcIndex + 1] & unchecked(
+				0xFF));
+		}
+
+		internal static int ReadInt4(byte[] src, int srcIndex)
+		{
+			return ((src[srcIndex] & unchecked(0xFF)) << 24) + ((src[srcIndex + 1] & unchecked(
+				0xFF)) << 16) + ((src[srcIndex + 2] & unchecked(0xFF)) << 8) + (src
+				[srcIndex + 3] & unchecked(0xFF));
+		}
+
+		internal static int ReadLength(byte[] src, int srcIndex)
+		{
+			srcIndex++;
+			return ((src[srcIndex++] & unchecked(0x01)) << 16) + ((src[srcIndex++] & unchecked(
+				0xFF)) << 8) + (src[srcIndex++] & unchecked(0xFF));
+		}
+
+		/// <exception cref="System.IO.IOException"></exception>
+		internal static int Readn(InputStream @in, byte[] b, int off, int len)
+		{
+			int i = 0;
+			int n;
+			while (i < len)
+			{
+				n = @in.Read(b, off + i, len - i);
+				if (n <= 0)
+				{
+					break;
+				}
+				i += n;
+			}
+			return i;
+		}
+
+		/// <exception cref="System.IO.IOException"></exception>
+		internal static int ReadPacketType(InputStream @in, byte[] buffer, int bufferIndex
+			)
+		{
+			int n;
+			if ((n = Readn(@in, buffer, bufferIndex, HeaderLength)) != HeaderLength)
+			{
+				if (n == -1)
+				{
+					return -1;
+				}
+				throw new IOException("unexpected EOF reading netbios session header");
+			}
+			int t = buffer[bufferIndex] & unchecked(0xFF);
+			return t;
+		}
+
+		internal int Type;
+
+		internal int Length;
+
+		public virtual int WriteWireFormat(byte[] dst, int dstIndex)
+		{
+			Length = WriteTrailerWireFormat(dst, dstIndex + HeaderLength);
+			WriteHeaderWireFormat(dst, dstIndex);
+			return HeaderLength + Length;
+		}
+
+		/// <exception cref="System.IO.IOException"></exception>
+		internal virtual int ReadWireFormat(InputStream @in, byte[] buffer, int bufferIndex
+			)
+		{
+			ReadHeaderWireFormat(@in, buffer, bufferIndex);
+			return HeaderLength + ReadTrailerWireFormat(@in, buffer, bufferIndex);
+		}
+
+		internal virtual int WriteHeaderWireFormat(byte[] dst, int dstIndex)
+		{
+			dst[dstIndex++] = unchecked((byte)Type);
+			if (Length > unchecked(0x0000FFFF))
+			{
+				dst[dstIndex] = unchecked(unchecked(0x01));
+			}
+			dstIndex++;
+			WriteInt2(Length, dst, dstIndex);
+			return HeaderLength;
+		}
+
+		/// <exception cref="System.IO.IOException"></exception>
+		internal virtual int ReadHeaderWireFormat(InputStream @in, byte[] buffer, int bufferIndex
+			)
+		{
+			Type = buffer[bufferIndex++] & unchecked(0xFF);
+			Length = ((buffer[bufferIndex] & unchecked(0x01)) << 16) + ReadInt2(buffer
+				, bufferIndex + 1);
+			return HeaderLength;
+		}
+
+		internal abstract int WriteTrailerWireFormat(byte[] dst, int dstIndex);
+
+		/// <exception cref="System.IO.IOException"></exception>
+		internal abstract int ReadTrailerWireFormat(InputStream @in, byte[] buffer, int bufferIndex
+			);
+	}
+}