70 lines
2.4 KiB
C#
70 lines
2.4 KiB
C#
using BMDevs.Runtime;
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using dnlib.PE;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace BMDevs.Mutations
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{
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public class BoolsToModuleReference : IObfuscation
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{
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public ModuleDef Module { get; set; }
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public Dictionary<bool, FieldDef> Numbers { get; set; }
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public void Execute(ModuleDefMD md)
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{
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Numbers = new Dictionary<bool, FieldDef>();
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Module = md;
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foreach (var type in md.Types.Where(x => x != md.GlobalType))
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foreach (var method in type.Methods.Where(x => !x.IsConstructor && x.HasBody && x.Body.HasInstructions))
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ExecuteMethod(method);
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}
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public FieldDef AddNumberField(int num)
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{
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var cstype = RuntimeHelper.GetRuntimeType("BMDevs.Runtime.BoolsToModule");
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FieldDef field = cstype.FindField("val");
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Renamer.Rename(field, Renamer.RenameMode.Invalid2, 2);
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//Renamer.Rename(field, Renamer.RenameMode.Base64, 2);
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field.DeclaringType = null;
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Module.GlobalType.Fields.Add(field);
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var method = Module.GlobalType.FindOrCreateStaticConstructor();
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method.Body.Instructions.Insert(0, new Instruction(OpCodes.Ldc_I4, num));
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method.Body.Instructions.Insert(1, new Instruction(OpCodes.Stsfld, field));
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return field;
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}
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//thanks to mighty
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public void ExecuteMethod(MethodDef method)
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{
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for (int i = 0; i < method.Body.Instructions.Count; i++)
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{
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var instr = method.Body.Instructions[i];
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if (instr.IsLdcI4())
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{
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if (Module.GlobalType.Fields.Count < 65000)
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{
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var val = instr.GetLdcI4Value();
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FieldDef fld;
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bool bufbool = false;
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if (val == 1) bufbool = true;
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if (!Numbers.TryGetValue(bufbool, out fld))
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{
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fld = AddNumberField(val);
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Numbers.Add(bufbool, fld);
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}
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instr.OpCode = OpCodes.Ldsfld;
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instr.Operand = fld;
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}
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}
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}
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}
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}
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}
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