From dd993b3c37948f679e0cd635773ecf80b5fdaa3a Mon Sep 17 00:00:00 2001
From: SuuperW <SuuperW@gmail.com>
Date: Thu, 17 Oct 2019 11:04:44 -0500
Subject: [PATCH] MelonDS: IStatable (and add forgotten file
 MelonDS_InputPollable.cs)

---
 .../BizHawk.Emulation.Cores.csproj            |  1 +
 .../Nintendo/NDS/MelonDS_InputPollable.cs     | 25 +++++++
 .../Consoles/Nintendo/NDS/MelonDS_Statable.cs | 68 +++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS_InputPollable.cs
 create mode 100644 BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS_Statable.cs

diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index 13432f693f..65ed94013a 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -988,6 +988,7 @@
     <Compile Include="Consoles\Nintendo\N64\NativeApi\mupen64plusVideoApi.cs" />
     <Compile Include="Consoles\Nintendo\NDS\MelonDS.cs" />
     <Compile Include="Consoles\Nintendo\NDS\MelonDS_InputPollable.cs" />
+    <Compile Include="Consoles\Nintendo\NDS\MelonDS_Statable.cs" />
     <Compile Include="Consoles\Nintendo\NDS\MelonDS_VideoProvider.cs" />
     <Compile Include="Consoles\Nintendo\NES\APU.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\AVE-NINA.cs" />
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS_InputPollable.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS_InputPollable.cs
new file mode 100644
index 0000000000..d883ddeabe
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS_InputPollable.cs
@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Runtime.InteropServices;
+
+using BizHawk.Emulation.Common;
+
+namespace BizHawk.Emulation.Cores.Consoles.Nintendo.NDS
+{
+	partial class MelonDS : IInputPollable
+	{
+		public int LagCount { get => GetLagFrameCount(); set => throw new NotImplementedException(); }
+		public bool IsLagFrame { get => _IsLagFrame(); set => throw new NotImplementedException(); }
+
+		public IInputCallbackSystem InputCallbacks => throw new NotImplementedException();
+
+		[DllImport(dllPath, EntryPoint = "IsLagFrame")]
+		private static extern bool _IsLagFrame();
+
+		[DllImport(dllPath)]
+		private static extern int GetLagFrameCount();
+	}
+}
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS_Statable.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS_Statable.cs
new file mode 100644
index 0000000000..c698f69433
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS_Statable.cs
@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Runtime.InteropServices;
+
+using BizHawk.Emulation.Common;
+using System.IO;
+
+namespace BizHawk.Emulation.Cores.Consoles.Nintendo.NDS
+{
+	unsafe partial class MelonDS : IStatable
+	{
+		public bool BinarySaveStatesPreferred => true;
+
+		public void LoadStateBinary(BinaryReader reader)
+		{
+			MemoryStream mStream = new MemoryStream();
+			reader.BaseStream.CopyTo(mStream);
+
+			LoadStateByteArray(mStream.GetBuffer(), (int)mStream.Length);
+		}
+		public void LoadStateText(TextReader reader)
+		{
+			string str = reader.ReadToEnd();
+			LoadStateByteArray(Convert.FromBase64String(str));
+		}
+		private void LoadStateByteArray(byte[] data, int length = -1)
+		{
+			if (length == -1) length = data.Length;
+			fixed (byte* ptr = data)
+			{
+				UseSavestate(ptr, length);
+			}
+		}
+
+		public byte[] SaveStateBinary()
+		{
+			int len = GetSavestateSize();
+			byte[] ret = new byte[len];
+			fixed (byte* ptr = ret)
+			{
+				GetSavestateData(ptr, len);
+			}
+			return ret;
+		}
+
+		public void SaveStateBinary(BinaryWriter writer)
+		{
+			byte[] data = SaveStateBinary();
+			writer.Write(data);
+		}
+
+		public void SaveStateText(TextWriter writer)
+		{
+			string str = Convert.ToBase64String(SaveStateBinary());
+			writer.Write(str);
+		}
+
+		[DllImport(dllPath)]
+		private static extern void UseSavestate(byte* data, int len);
+		[DllImport(dllPath)]
+		private static extern int GetSavestateSize();
+		[DllImport(dllPath)]
+		private static extern void GetSavestateData(byte* data, int size);
+	}
+}