Optimise network reading - only need to move memory after all pending packets are processed, not after each field.

ClassicalSharp/Network/NetworkProcessor.CPE.cs

@@ -469,16 +469,15 @@ namespace ClassicalSharp {
 			int count = reader.ReadUInt8() + 1;
 			if( game.Map.IsNotLoaded ) {
 				Utils.LogDebug( "Server tried to update a block while still sending us the map!" );
-				reader.Remove( bulkCount * (sizeof(int) + 1) );
+				reader.Skip( bulkCount * (sizeof(int) + 1) );
 				return;
-			}
-			
+			}			
 			int* indices = stackalloc int[bulkCount];
 			for( int i = 0; i < count; i++ )
-				indices[i] = ReadInt32( reader.buffer, i * 4 );
+				indices[i] = reader.ReadInt32();
 			
 			for( int i = 0; i < count; i++ ) {
-				byte block = reader.buffer[i + bulkCount * sizeof(int)];
+				byte block = reader.ReadUInt8();
 				Vector3I coords = game.Map.GetCoords( indices[i] );
 				
 				if( coords.X < 0 ) {
@@ -487,12 +486,6 @@ namespace ClassicalSharp {
 				}
 				game.UpdateBlock( coords.X, coords.Y, coords.Z, block );
 			}
-			reader.Remove( bulkCount * (sizeof(int) + 1) );
-		}
-		
-		static int ReadInt32( byte[] buffer, int offset ) {
-			return buffer[offset + 0] << 24 | buffer[offset + 1] << 16
-				| buffer[offset + 2] << 8 | buffer[offset + 3];
 		}
 		
 		void HandleSetTextColor() {

ClassicalSharp/Network/NetworkProcessor.Original.cs

@@ -124,6 +124,7 @@ namespace ClassicalSharp {
 				HandleLevelInit();
 			int usedLength = reader.ReadInt16();
 			gzippedMap.Position = 0;
+			gzippedMap.Offset = reader.index;
 			gzippedMap.SetLength( usedLength );
 			
 			if( gzipHeader.done || gzipHeader.ReadHeader( gzippedMap ) ) {
@@ -140,7 +141,7 @@ namespace ClassicalSharp {
 				}
 			}
 			
-			reader.Remove( 1024 );
+			reader.Skip( 1024 );
 			byte progress = reader.ReadUInt8();
 			game.MapEvents.RaiseMapLoading( progress );
 		}

ClassicalSharp/Network/NetworkProcessor.cs

@@ -77,11 +77,11 @@ namespace ClassicalSharp {
 				throw;
 			}
 			
-			while( reader.size > 0 ) {
-				byte opcode = reader.buffer[0];
+			while( (reader.size - reader.index) > 0 ) {
+				byte opcode = reader.buffer[reader.index];
 				// Workaround for older D3 servers which wrote one byte too many for HackControl packets.
 				if( opcode == 0xFF && lastOpcode == PacketId.CpeHackControl ) {
-					reader.Remove( 1 );
+					reader.Skip( 1 );
 					game.LocalPlayer.jumpVel = 0.42f; // assume default jump height
 					game.LocalPlayer.serverJumpVel = game.LocalPlayer.jumpVel;
 					continue;
@@ -90,13 +90,14 @@ namespace ClassicalSharp {
 				if( opcode >= maxHandledPacket ) {
 					ErrorHandler.LogError( "NetworkProcessor.Tick",
 					                      "received an invalid opcode of " + opcode );
-					reader.Remove( 1 );
+					reader.Skip( 1 );
 					continue;
 				}
 				
-				if( reader.size < packetSizes[opcode] ) break;
+				if( (reader.size - reader.index) < packetSizes[opcode] ) break;
 				ReadPacket( opcode );
 			}
+			reader.RemoveRead();
 			
 			Player player = game.LocalPlayer;
 			if( receivedFirstPosition ) {
@@ -134,7 +135,7 @@ namespace ClassicalSharp {
 		PacketId lastOpcode;
 		
 		void ReadPacket( byte opcode ) {
-			reader.Remove( 1 ); // remove opcode
+			reader.Skip( 1 ); // remove opcode
 			lastOpcode = (PacketId)opcode;
 			Action handler = handlers[opcode];
 			lastPacket = DateTime.UtcNow;
@@ -145,7 +146,7 @@ namespace ClassicalSharp {
 		}
 		
 		void SkipPacketData( PacketId opcode ) {
-			reader.Remove( packetSizes[(byte)opcode] - 1 );
+			reader.Skip( packetSizes[(byte)opcode] - 1 );
 		}
 		
 		Action[] handlers;

ClassicalSharp/Network/Utils/FixedBufferStream.cs

@@ -8,23 +8,16 @@ namespace ClassicalSharp {
 	internal class FixedBufferStream : Stream {
 		
 		public byte[] _buffer;
-		int _position, _length;
+		int _position, _length;		
+		public int Offset;
 		
-		public override bool CanRead {
-			get { return true; }
-		}
+		public override bool CanRead { get { return true; } }
 		
-		public override bool CanSeek {
-			get { return false; }
-		}
+		public override bool CanSeek { get { return false; } }
 		
-		public override bool CanWrite {
-			get { return false; }
-		}
+		public override bool CanWrite { get { return false; } }
 		
-		public override long Length {
-			get { return _length; }
-		}
+		public override long Length { get { return _length; } }
 		
 		public override long Position {
 			get { return _position; }
@@ -35,22 +28,23 @@ namespace ClassicalSharp {
 			_buffer = buffer;
 		}
 		
-		public override void Flush() {
-		}
+		public override void Flush() { }
 		
 		public override int Read( byte[] buffer, int offset, int count ) {
 			int numBytes = _length - _position;
 			if( numBytes > count ) numBytes = count;
 			if( numBytes <= 0 ) return 0;
 			
-			Buffer.BlockCopy( _buffer, _position, buffer, offset, numBytes );
+			Buffer.BlockCopy( _buffer, Offset + _position, buffer, offset, numBytes );
 			_position += numBytes;
 			return numBytes;
 		}
 		
 		public override int ReadByte() {
 			if( _position >= _length ) return -1;
-			return _buffer[_position++];
+			byte value = _buffer[Offset + _position];
+			_position++;
+			return value;
 		}
 		
 		public override long Seek( long offset, SeekOrigin origin ) {

ClassicalSharp/Network/Utils/NetReader.cs

@@ -6,7 +6,7 @@ namespace ClassicalSharp {
 	internal class NetReader {
 		
 		public byte[] buffer = new byte[4096 * 5];
-		public int size = 0;
+		public int index = 0, size = 0;
 		public NetworkStream Stream;
 		
 		public NetReader( NetworkStream stream ) {
@@ -21,52 +21,59 @@ namespace ClassicalSharp {
 			size += received;
 		}
 		
-		public void Remove( int byteCount ) {
-			size -= byteCount;
-			Buffer.BlockCopy( buffer, byteCount, buffer, 0, size );
+		public void Skip( int byteCount ) {
+			index += byteCount;
+		}
+		
+		public void RemoveProcessed() {			
+			size -= index;
+			if( size > 0 ) // only copy left over bytes
+				Buffer.BlockCopy( buffer, index, buffer, 0, size );			
+			index = 0;
 			// We don't need to zero the old bytes, since they will be overwritten when ReadData() is called.
 		}
 		
 		public int ReadInt32() {
-			int value = buffer[0] << 24 | buffer[1] << 16 | buffer[2] << 8 | buffer[3];
-			Remove( 4 );
+			int value = buffer[index] << 24 | buffer[index + 1] << 16 | 
+				buffer[index + 2] << 8 | buffer[index + 3];
+			index += 4;
 			return value;
 		}
 		
 		public short ReadInt16() {
-			short value = (short)( buffer[0] << 8 | buffer[1] );
-			Remove( 2 );
+			short value = (short)(buffer[index] << 8 | buffer[index + 1]);
+			index += 2;
 			return value;
 		}
 		
 		public sbyte ReadInt8() {
-			sbyte value = (sbyte)buffer[0];
-			Remove( 1 );
+			sbyte value = (sbyte)buffer[index];
+			index++;
 			return value;
 		}
 		
 		public byte ReadUInt8() {
-			byte value = buffer[0];
-			Remove( 1 );
+			byte value = buffer[index];
+			index++;
 			return value;
 		}
 		
 		public byte[] ReadBytes( int length ) {
 			byte[] data = new byte[length];
-			Buffer.BlockCopy( buffer, 0, data, 0, length );
-			Remove( length );
+			Buffer.BlockCopy( buffer, index, data, 0, length );
+			index += length;
 			return data;
 		}
 
 		public string ReadCp437String() {
-			int length = GetString( buffer, false );
-			Remove( 64 );
+			int length = GetString( false );
+			index += 64;
 			return new String( characters, 0, length );
 		}
 		
 		public string ReadAsciiString() {
-			int length = GetString( buffer, true );
-			Remove( 64 );
+			int length = GetString( true );
+			index += 64;
 			return new String( characters, 0, length );
 		}
 		
@@ -75,8 +82,8 @@ namespace ClassicalSharp {
 				return ReadCp437String();
 					
 			messageType = (byte)MessageType.Normal;
-			int length = GetString( buffer, false );		
-			Remove( 64 );
+			int length = GetString( false );		
+			index += 64;
 			
 			int offset = 0;
 			if( length >= womDetail.Length && IsWomDetailString() ) {
@@ -97,10 +104,10 @@ namespace ClassicalSharp {
 			return true;
 		}
 		
-		static int GetString( byte[] data, bool ascii ) {			
+		int GetString( bool ascii ) {			
 			int length = 0;
 			for( int i = 63; i >= 0; i-- ) {
-				byte code = data[i];
+				byte code = buffer[index + i];
 				if( length == 0 && !( code == 0 || code == 0x20 ) )
 				   length = i + 1;