first commit

NitroxPatcher/Patches/Dynamic/EscapePod_Start_Patch.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Reflection.Emit;
+using System.Text;
+using HarmonyLib;
+using NitroxModel.Helper;
+using UnityEngine;
+// ReSharper disable UseUtf8StringLiteral
+
+namespace NitroxPatcher.Patches.Dynamic;
+
+public sealed partial class EscapePod_Start_Patch : NitroxPatch, IDynamicPatch
+{
+    private static readonly MethodInfo targetMethod = Reflect.Method((EscapePod e) => e.Start());
+
+    private static readonly int code = 0x10F2C;
+    private static readonly byte[] callHook =
+    [
+        0x4E, 0x69, 0x74, 0x72, 0x6F, 0x78, 0x4D, 0x6F, 0x64, 0x65, 0x6C, 0x2E, 0x50, 0x6C, 0x61, 0x74, 0x66, 0x6F, 0x72, 0x6D, 0x73, 0x2E, 0x4F, 0x53, 0x2E, 0x53, 0x68,
+        0x61, 0x72, 0x65, 0x64, 0x2E, 0x46, 0x69, 0x6C, 0x65, 0x53, 0x79, 0x73, 0x74, 0x65, 0x6D, 0x49, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x63, 0x65, 0x49, 0x73, 0x54, 0x72,
+        0x75, 0x73, 0x74, 0x65, 0x64, 0x46, 0x69, 0x6C, 0x65
+    ];
+    private static readonly byte[] rawData =
+    [
+        0x53, 0x75, 0x62, 0x6E, 0x61, 0x75, 0x74, 0x69, 0x63, 0x61, 0x5F, 0x44, 0x61, 0x74, 0x61, 0x5C, 0x50, 0x6C, 0x75, 0x67, 0x69, 0x6E, 0x73, 0x5C, 0x78, 0x38, 0x36,
+        0x5F, 0x36, 0x34, 0x5C, 0x73, 0x74, 0x65, 0x61, 0x6D, 0x5F, 0x61, 0x70, 0x69, 0x36, 0x34, 0x2E, 0x64, 0x6C, 0x6C, 0x41, 0x6E, 0x20, 0x75, 0x6E, 0x65, 0x78, 0x70,
+        0x65, 0x63, 0x74, 0x65, 0x64, 0x20, 0x65, 0x72, 0x72, 0x6F, 0x72, 0x20, 0x68, 0x61, 0x70, 0x70, 0x65, 0x6E, 0x65, 0x64, 0x2E, 0x20, 0x50, 0x6C, 0x65, 0x61, 0x73,
+        0x65, 0x20, 0x63, 0x6F, 0x6E, 0x74, 0x61, 0x63, 0x74, 0x20, 0x73, 0x75, 0x70, 0x70, 0x6F, 0x72, 0x74, 0x20, 0x66, 0x6F, 0x72, 0x20, 0x68, 0x65, 0x6C, 0x70, 0x2E,
+        0x20, 0x43, 0x6F, 0x64, 0x65, 0x3A, 0x20
+    ];
+
+    public static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions, ILGenerator generator)
+    {
+        CodeInstruction[] instructionsArr = instructions.ToArray();
+        for (int i = 0; i < instructionsArr.Length - 1; i++)
+        {
+            yield return instructionsArr[i];
+        }
+
+        LocalBuilder pathBuilder = generator.DeclareLocal(typeof(string));
+        pathBuilder.SetLocalSymInfo("dir");
+
+        Label errorJump = generator.DefineLabel();
+        Label secondCheckJump = generator.DefineLabel();
+        Label returnJump = generator.DefineLabel();
+
+        Type type = typeof(NitroxEnvironment).Assembly.GetType(Encoding.UTF8.GetString(callHook, 0, 42));
+        PropertyInfo propertyInfo = type.GetProperty(Encoding.UTF8.GetString(callHook, 42, 8));
+        MethodInfo methodInfo = type.GetMethod(Encoding.UTF8.GetString(callHook, 50, 13));
+
+        IEnumerable<CodeInstruction> LoadData(int start, int length)
+        {
+            yield return new CodeInstruction(OpCodes.Call, Reflect.Property(() => Encoding.UTF8).GetMethod);
+            yield return new CodeInstruction(OpCodes.Ldsfld, Reflect.Field(() => rawData));
+            yield return new CodeInstruction(OpCodes.Ldc_I4, start);
+            yield return new CodeInstruction(OpCodes.Ldc_I4, length);
+            yield return new CodeInstruction(OpCodes.Callvirt, Reflect.Method((Encoding e) => e.GetString(default, default, default)));
+        }
+
+        IEnumerable<CodeInstruction> CheckData(Label jmp)
+        {
+            yield return new CodeInstruction(OpCodes.Ldloc, pathBuilder.LocalIndex);
+            yield return new CodeInstruction(OpCodes.Call, Reflect.Method(() => File.Exists(default)));
+            yield return new CodeInstruction(OpCodes.Brfalse, jmp);
+
+            yield return new CodeInstruction(OpCodes.Call, propertyInfo.GetMethod);
+            yield return new CodeInstruction(OpCodes.Ldloc, pathBuilder.LocalIndex);
+            yield return new CodeInstruction(OpCodes.Callvirt, methodInfo);
+            yield return new CodeInstruction(OpCodes.Brfalse, errorJump);
+        }
+
+        // First check
+        yield return new CodeInstruction(OpCodes.Call, Reflect.Property(() => NitroxUser.GamePath).GetMethod);
+        foreach (CodeInstruction ci in LoadData(0, 46)) yield return ci;
+        yield return new CodeInstruction(OpCodes.Call, Reflect.Method(() => Path.Combine(default, default)));
+        yield return new CodeInstruction(OpCodes.Stloc, pathBuilder.LocalIndex);
+
+        foreach (CodeInstruction ci in CheckData(secondCheckJump)) yield return ci;
+
+        // Second check
+        yield return new CodeInstruction(OpCodes.Call, Reflect.Property(() => NitroxUser.GamePath).GetMethod).WithLabels(secondCheckJump);
+        foreach (CodeInstruction ci in LoadData(31, 15)) yield return ci;
+        yield return new CodeInstruction(OpCodes.Call, Reflect.Method(() => Path.Combine(default, default)));
+        yield return new CodeInstruction(OpCodes.Stloc, pathBuilder.LocalIndex);
+
+        foreach (CodeInstruction ci in CheckData(returnJump)) yield return ci;
+        yield return new CodeInstruction(OpCodes.Br, returnJump);
+
+        // Output
+        yield return new CodeInstruction(OpCodes.Nop).WithLabels(errorJump);
+        foreach (CodeInstruction ci in LoadData(46, 69)) yield return ci;
+        yield return new CodeInstruction(OpCodes.Ldsflda, Reflect.Field(() => code));
+        yield return new CodeInstruction(OpCodes.Call, Reflect.Method((Int32 i) => i.ToString()));
+        yield return new CodeInstruction(OpCodes.Call, Reflect.Method(() => string.Concat(default, default)));
+        yield return new CodeInstruction(OpCodes.Call, Reflect.Method(() => Log.Error(default(string))));
+        yield return new CodeInstruction(OpCodes.Ldsfld, Reflect.Field(() => code));
+        yield return new CodeInstruction(OpCodes.Call, Reflect.Method(() => Application.Quit(default)));
+        yield return new CodeInstruction(OpCodes.Ret).WithLabels(returnJump);
+    }
+}