public void Patch()
{
HelperClass.SetLogger(logger);
MethodDefinition initChunkCluster = HelperClass.findMember <MethodDefinition>(module, "ChunkCluster", false,
HelperClass.MemberNameComparer <MethodDefinition>("Init"),
HelperClass.MethodParametersComparer("EnumChunkProviderId"));
if (initChunkCluster == null)
{
return;
}
{
int[] jumpsToDefault = HelperClass.FindOPCodePattern(initChunkCluster, new OpCode[] { OpCodes.Switch, OpCodes.Br }, 1);
if (jumpsToDefault.Length == 0)
{
logger.Error("ChunkCluster.Init has no switch (am I outdated?)!");
return;
}
if (jumpsToDefault.Length > 1)
{
logger.Error("ChunkCluster.Init has multiple switches (am I outdated?)!");
return;
}
MethodBody body = initChunkCluster.Body;
int targetIndex = body.Instructions.IndexOf((Instruction)body.Instructions[jumpsToDefault[0]].Operand);
if (!HelperClass.MethodOPCodeComparer(new int[] { targetIndex, targetIndex + 1, targetIndex + 2 }, new OpCode[] { OpCodes.Ldarg_0, OpCodes.Ldnull, OpCodes.Stfld }, null).Execute(initChunkCluster))
{
logger.Error("ChunkCluster.Init's default case is unknown (I am outdated!)!");
return;
}
ILProcessor proc = body.GetILProcessor();
List <Instruction> hook = HookHelper.Instance.prepareEventHook(initChunkCluster, "UnknownChunkProviderEvent", new Instruction[][] {
new Instruction[] { proc.Create(OpCodes.Ldarg_0) },
new Instruction[] { proc.Create(OpCodes.Ldc_I4_0), proc.Create(OpCodes.Box, module.Import(mscorlibModule.GetType("System.Boolean"))) },
new Instruction[] { proc.Create(OpCodes.Ldarg_1), proc.Create(OpCodes.Box, module.Import(mscorlibModule.GetType("System.Int32"))) },
new Instruction[] { proc.Create(OpCodes.Ldnull) },
}); hook.Insert(0, proc.Create(OpCodes.Ldarg_0));
hook.Add(proc.Create(OpCodes.Dup));
hook.Add(proc.Create(OpCodes.Ldc_I4_1));
hook.Add(proc.Create(OpCodes.Ldelem_Ref));
hook.Add(proc.Create(OpCodes.Unbox_Any, module.Import(mscorlibModule.GetType("System.Boolean"))));
int jmp1_sindex = hook.Count; hook.Add(null); //brtrue
hook.Add(proc.Create(OpCodes.Pop));
hook.Add(proc.Create(OpCodes.Br, body.Instructions[targetIndex + 1]));
int jmp1_tindex = hook.Count;
hook.Add(proc.Create(OpCodes.Ldc_I4_2));
hook.Add(proc.Create(OpCodes.Ldelem_Ref));
hook.Add(proc.Create(OpCodes.Br, body.Instructions[targetIndex + 2]));
hook.RemoveAt(jmp1_sindex); hook.Insert(jmp1_sindex, proc.Create(OpCodes.Brtrue, hook[jmp1_tindex]));
HookHelper.insertAt(body, targetIndex, hook.ToArray());
body.Instructions[jumpsToDefault[0]].Operand = hook[0];
}
}
