Added GSPalConv

It converts Genesis palette data into something YY-CHR can use.

GSPalConv.cs

@@ -0,0 +1,138 @@
+using System;
+using System.IO;
+
+namespace GSPalConv
+{
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			BinaryWriter bw;
+			BinaryReader br;
+
+			//Arguments stuff
+			if (args.Length == 0)
+			{
+				System.Console.WriteLine("Genesis Standard Palette Converter - converts 0BGR palette data into RRGGBB data, perfect for YY-CHR!");
+				System.Console.WriteLine("Usage: GSPalConv <filename> [output = out.pal] [offset = 0 (give a hex value without a prefix)] [lines = 1]");
+				return;
+			}
+
+			//Set up the datum
+			string infile;
+			string outfile;
+			int offset;
+			int lines;
+			bool test = false;
+			byte red;
+			byte green;
+			byte blue;
+			byte color1;
+			byte color2;
+
+			//Input file
+			infile = args[0];
+
+			//Output file
+			if (args.Length >= 2)
+			{
+				outfile = args[1];
+			}
+			else
+			{
+				outfile = "out.pal";
+			}
+
+			//Palette data offset (why do some games put this data in different places? Default is for working with disassembly files)
+			if (args.Length >= 3)
+			{
+				offset = Int32.Parse(args[2], System.Globalization.NumberStyles.HexNumber);
+			}
+			else
+			{
+				offset = 0;
+			}
+
+			//Make sure this last argument is a number...
+			if (args.Length >= 4)
+			{
+				test = int.TryParse(args[3], out lines);
+			}
+			else
+			{
+				lines = 1;
+			}
+
+			//And if so...
+			if (test == true)
+			{
+				//Minimum of one palette line (like Sonic's palette from the disassembly)
+				if (lines < 1)
+				{
+					lines = 1;
+				}
+				//Maximum of 16 lines (YY-CHR can't handle more than that!)
+				else if (lines > 16)
+				{
+					lines = 16;
+				}
+			}
+			else
+			{
+				lines = 1;
+			}
+
+			//reading from the file
+			try
+			{
+				br = new BinaryReader(new FileStream(infile, FileMode.Open));
+			}
+			catch (IOException e)
+			{
+				Console.WriteLine(e.Message + "\n Cannot open input file.");
+				return;
+			}
+
+			//create the output file
+			try
+			{
+				bw = new BinaryWriter(new FileStream(outfile, FileMode.Create));
+			}
+			catch (IOException e)
+			{
+				Console.WriteLine(e.Message + "\n Cannot create output file.");
+				return;
+			}
+
+			//The main event!
+			for (int i = 0; i < (lines * 16); i++)
+			{
+				color1 = br.ReadByte();
+				color2 = br.ReadByte();
+				// Genesis pallete entries are words - 0B GR
+				red = Convert.ToByte(17 * (color2 % 16));
+				green = Convert.ToByte(17 * Math.Floor(color2 / 16f));
+				blue = Convert.ToByte(17 * (color1 % 16));
+
+				//writing into the file
+				try
+				{
+					bw.Write(red);
+					bw.Write(green);
+					bw.Write(blue);
+				}
+				catch (IOException e)
+				{
+					Console.WriteLine(e.Message + "\n Cannot write to output file.");
+					return;
+				}
+			}
+
+			//Close up everything and let user know a success was happen
+			br.Close();
+			bw.Close();
+			Console.WriteLine("SUCCESS!");
+			return;
+		}
+	}
+}