Scp3114FriendlyFireFix

Author: louis1706

EXILED/Exiled.Events/Patches/Fixes/Scp3114FriendlyFireFix.cs

@@ -0,0 +1,115 @@
+// -----------------------------------------------------------------------
+// <copyright file="Scp3114FriendlyFireFix.cs" company="Exiled Team">
+// Copyright (c) Exiled Team. All rights reserved.
+// Licensed under the CC BY-SA 3.0 license.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Exiled.Events.Patches.Fixes
+{
+#pragma warning disable SA1402 // File may only contain a single type
+    using System.Collections.Generic;
+    using System.Reflection.Emit;
+
+    using API.Features.Pools;
+    using Footprinting;
+    using HarmonyLib;
+    using InventorySystem.Items.Pickups;
+    using InventorySystem.Items.ThrowableProjectiles;
+    using PlayerRoles;
+    using PlayerStatsSystem;
+
+    using static HarmonyLib.AccessTools;
+
+    /// <summary>
+    /// Patches the <see cref="Scp2176Projectile.ServerShatter()"/> delegate.
+    /// Fix Throwing a ghostlight with Scp in the room stun 079.
+    /// Bug reported to NW (https://git.scpslgame.com/northwood-qa/scpsl-bug-reporting/-/issues/55).
+    /// </summary>
+    [HarmonyPatch(typeof(Scp2176Projectile), nameof(Scp2176Projectile.ServerShatter))]
+    internal class Scp3114FriendlyFireFix
+    {
+        private static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions, ILGenerator generator)
+        {
+            List<CodeInstruction> newInstructions = ListPool<CodeInstruction>.Pool.Get(instructions);
+
+            int offset = 0;
+            int index = newInstructions.FindIndex(x => x.operand == (object)Field(typeof(Scp2176Projectile), nameof(Scp2176Projectile.OnServerShattered))) + offset;
+
+            Label skip = (Label)newInstructions[index].operand;
+
+            newInstructions.InsertRange(index, new[]
+            {
+                // if (this.PreviousOwner.Role.GetTeam() is Team.SCPs)
+                new CodeInstruction(OpCodes.Ldarg_0).MoveLabelsFrom(newInstructions[index]),
+                new(OpCodes.Ldfld, Field(typeof(Scp2176Projectile), nameof(Scp2176Projectile.PreviousOwner))),
+                new(OpCodes.Ldfld, Field(typeof(Footprint), nameof(Footprint.Role))),
+                new(OpCodes.Call, Method(typeof(PlayerRolesUtils), nameof(PlayerRolesUtils.GetTeam))),
+                new(OpCodes.Ldc_I4_0),
+                new(OpCodes.Ceq),
+                new CodeInstruction(OpCodes.Brtrue_S, skip),
+            });
+
+            offset = 0;
+            index = newInstructions.FindIndex(x => x.operand == (object)Field(typeof(RoomLightController), nameof(RoomLightController.Instances))) + offset;
+
+            newInstructions[index].labels.Add(skip);
+
+            for (int z = 0; z < newInstructions.Count; z++)
+                yield return newInstructions[z];
+
+            ListPool<CodeInstruction>.Pool.Return(newInstructions);
+        }
+    }
+
+    /// <summary>
+    /// Patches the <see cref="CollisionDetectionPickup.ProcessCollision(UnityEngine.Collision)"/> delegate.
+    /// Fix Throwing a ghostlight with Scp in the room stun 079.
+    /// Bug reported to NW (https://git.scpslgame.com/northwood-qa/scpsl-bug-reporting/-/issues/55).
+    /// </summary>
+    [HarmonyPatch(typeof(CollisionDetectionPickup), nameof(CollisionDetectionPickup.ProcessCollision))]
+    internal class Scp3114FriendlyFireFix2 : AttackerDamageHandler
+    {
+#pragma warning disable SA1600 // Elements should be documented
+        public Scp3114FriendlyFireFix2(Footprint attacker, float damage)
+        {
+            Attacker = attacker;
+            Damage = damage;
+            AllowSelfDamage = false;
+            ServerLogsText = "Scp3114 Fix";
+        }
+
+        public override Footprint Attacker { get; set; }
+
+        public override bool AllowSelfDamage { get; }
+
+        public override float Damage { get; set; }
+
+        public override string ServerLogsText { get; }
+#pragma warning restore SA1600 // Elements should be documented
+
+        private static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions, ILGenerator generator)
+        {
+            List<CodeInstruction> newInstructions = ListPool<CodeInstruction>.Pool.Get(instructions);
+
+            int offset = 0;
+            int index = newInstructions.FindLastIndex(x => x.opcode == OpCodes.Ldnull) + offset;
+
+            // replace null with new Scp3114FriendlyFireFix2(this.PreviousOwner, num2)
+            newInstructions.RemoveAt(index);
+            newInstructions.InsertRange(index, new CodeInstruction[]
+            {
+                // new Scp3114FriendlyFireFix2(this.PreviousOwner, num2)
+                new(OpCodes.Ldarg_0),
+                new(OpCodes.Ldfld, Field(typeof(CollisionDetectionPickup), nameof(CollisionDetectionPickup.PreviousOwner))),
+                new(OpCodes.Ldloc_3),
+                new(OpCodes.Newobj, GetDeclaredConstructors(typeof(Scp3114FriendlyFireFix2))[0]),
+            });
+
+            for (int z = 0; z < newInstructions.Count; z++)
+                yield return newInstructions[z];
+
+            ListPool<CodeInstruction>.Pool.Return(newInstructions);
+        }
+    }
+}