intellivision add gamedb selection to cartridge

start process of mapper selection

BizHawk.Emulation.Cores/Consoles/Intellivision/Cartridge.cs

@@ -1,4 +1,7 @@
 using BizHawk.Common;
+using BizHawk.Common.BufferExtensions;
+using BizHawk.Emulation.Common;
+using System;
 
 namespace BizHawk.Emulation.Cores.Intellivision
 {
@@ -6,17 +9,22 @@ namespace BizHawk.Emulation.Cores.Intellivision
 	{
 		private ushort[] Data = new ushort[56320];
 
+		// There are 10 mappers Intellivision games use (not counting intellicart which is handled seperately)
+		// we will pick the mapper from the game DB and default to 0
+		private int mapper = 0; 
+
 		public void SyncState(Serializer ser)
 		{
 			ser.BeginSection("Cart");
 
-			// TODO
+			ser.Sync("mapper", ref mapper);
 
 			ser.EndSection();
 		}
 
 		public int Parse(byte[] Rom)
 		{
+			/*
 			// TODO: Determine which loading method, if either, is correct.
 			int index = 0;
 			// Combine every two bytes into a word.
@@ -28,9 +36,79 @@ namespace BizHawk.Emulation.Cores.Intellivision
 			for (int index = 0; index < Rom.Length; index++)
 				Data[index + 0x2C00] = Rom[index];
 			*/
+
+			// Combine every two bytes into a word.
+			int index = 0;
+
+			while (index + 1 < Rom.Length)
+			{
+				Data[(index / 2)] = (ushort)((Rom[index++] << 8) | Rom[index++]);
+			}
+
+			// look up hash in gamedb to see what mapper to use
+			// if none found default is zero
+			string hash_sha1 = null;
+			string s_mapper = null;
+			hash_sha1 = "sha1:" + Rom.HashSHA1(16, Rom.Length - 16);
+
+			var gi = Database.CheckDatabase(hash_sha1);
+			if (gi != null)
+			{
+				var dict = gi.GetOptionsDict();
+				if (!dict.ContainsKey("board"))
+					throw new Exception("INTV gamedb entries must have a board identifier!");
+				s_mapper = dict["board"];
+				Console.WriteLine(mapper);
+			}
+			else
+			{
+				s_mapper = "0";
+			}
+
+			int.TryParse(s_mapper, out mapper);
+
 			return Rom.Length;
 		}
 
+		public ushort? ReadCart(ushort addr)
+		{
+			switch (mapper)
+			{
+				case 0:
+					if (addr>=0x5000 && addr<0x6FFF)
+					{
+						return Data[addr-0x5000];
+					}
+					else if (addr>=0xD000 && addr<0xDFFF)
+					{
+						return Data[addr - 0xB000];
+					}
+					else if (addr>=0xF000 && addr<0xFFFF)
+					{
+						return Data[addr - 0xC000];
+					}
+					break;
+				case 5:
+					if (addr >= 0x5000 && addr < 0x7FFF)
+					{
+						return Data[addr - 0x5000];
+					}
+					else if (addr >= 0x9000 && addr < 0xBFFF)
+					{
+						return Data[addr - 0x6000];
+					}
+					break;
+			}
+
+
+			return null;
+		}
+
+		public bool WriteCart(ushort addr, ushort value)
+		{
+			return false;
+		}
+		/*
 		public ushort? ReadCart(ushort addr)
 		{
 			// TODO: Check if address is RAM / ROM.
@@ -153,6 +231,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
 			return null;
 		}
 
+
 		public bool WriteCart(ushort addr, ushort value)
 		{
 			int dest;
@@ -294,5 +373,6 @@ namespace BizHawk.Emulation.Cores.Intellivision
 			}
 			return false;
 		}
+		*/
 	}
 }