BizHawk/BizHawk.Emulation.Cores/Consoles/Atari/lynx/Lynx.IStatable.cs

using System;
using System.IO;
using System.Linq;
using Newtonsoft.Json;

using BizHawk.Emulation.Common;

namespace BizHawk.Emulation.Cores.Atari.Lynx
{
    public partial class Lynx : IStatable
    {
        public bool BinarySaveStatesPreferred
        {
            get { return true; }
        }

        public void SaveStateText(TextWriter writer)
        {
            var s = new TextState<TextStateData>();
            s.Prepare();
            var ff = s.GetFunctionPointersSave();
            LibLynx.TxtStateSave(Core, ref ff);
            s.ExtraData.IsLagFrame = IsLagFrame;
            s.ExtraData.LagCount = LagCount;
            s.ExtraData.Frame = Frame;

            ser.Serialize(writer, s);
            // write extra copy of stuff we don't use
            writer.WriteLine();
            writer.WriteLine("Frame {0}", Frame);

            //Console.WriteLine(BizHawk.Common.BufferExtensions.BufferExtensions.HashSHA1(SaveStateBinary()));
        }

        public void LoadStateText(TextReader reader)
        {
            var s = (TextState<TextStateData>)ser.Deserialize(reader, typeof(TextState<TextStateData>));
            s.Prepare();
            var ff = s.GetFunctionPointersLoad();
            LibLynx.TxtStateLoad(Core, ref ff);
            IsLagFrame = s.ExtraData.IsLagFrame;
            LagCount = s.ExtraData.LagCount;
            Frame = s.ExtraData.Frame;
        }

        public void SaveStateBinary(BinaryWriter writer)
        {
            if (!LibLynx.BinStateSave(Core, savebuff, savebuff.Length))
            {
                throw new InvalidOperationException("Core's BinStateSave() returned false!");
            }

            writer.Write(savebuff.Length);
            writer.Write(savebuff);

            // other variables
            writer.Write(IsLagFrame);
            writer.Write(LagCount);
            writer.Write(Frame);
        }

        public void LoadStateBinary(BinaryReader reader)
        {
            int length = reader.ReadInt32();
            if (length != savebuff.Length)
            {
                throw new InvalidOperationException("Save buffer size mismatch!");
            }

            reader.Read(savebuff, 0, length);
            if (!LibLynx.BinStateLoad(Core, savebuff, savebuff.Length))
            {
                throw new InvalidOperationException("Core's BinStateLoad() returned false!");
            }

            // other variables
            IsLagFrame = reader.ReadBoolean();
            LagCount = reader.ReadInt32();
            Frame = reader.ReadInt32();
        }

        public byte[] SaveStateBinary()
        {
            var ms = new MemoryStream(savebuff2, true);
            var bw = new BinaryWriter(ms);
            SaveStateBinary(bw);
            bw.Flush();
            if (ms.Position != savebuff2.Length)
            {
                throw new InvalidOperationException();
            }

            ms.Close();
            return savebuff2;
        }

        private JsonSerializer ser = new JsonSerializer { Formatting = Formatting.Indented };
        private byte[] savebuff;
        private byte[] savebuff2;

        private class TextStateData
        {
            public int Frame;
            public int LagCount;
            public bool IsLagFrame;
        }
    }
}