82 lines
2.1 KiB
C#
82 lines
2.1 KiB
C#
/*
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Copyright (C) 2011-2015 de4dot@gmail.com
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Skater_NET {
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class EnumClassFinder {
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ModuleDefMD module;
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FieldDef enumField;
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public EnumClassFinder(ModuleDefMD module) {
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this.module = module;
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Find();
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}
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void Find() {
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foreach (var type in module.Types) {
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if (type.HasEvents || type.HasProperties)
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continue;
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if (type.Methods.Count != 1)
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continue;
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if (type.Fields.Count != 1)
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continue;
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var method = type.Methods[0];
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if (method.Name != ".ctor")
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continue;
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var field = type.Fields[0];
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var fieldType = DotNetUtils.GetType(module, field.FieldSig.GetFieldType());
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if (fieldType == null)
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continue;
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if (!fieldType.IsEnum)
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continue;
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enumField = field;
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return;
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}
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}
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public void Deobfuscate(Blocks blocks) {
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foreach (var block in blocks.MethodBlocks.GetAllBlocks()) {
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var instrs = block.Instructions;
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for (int i = 0; i < instrs.Count - 2; i++) {
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var ldsfld = instrs[i];
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if (ldsfld.OpCode.Code != Code.Ldsfld)
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continue;
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var ldci4 = instrs[i + 1];
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if (!ldci4.IsLdcI4())
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continue;
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var stfld = instrs[i + 2];
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if (stfld.OpCode.Code != Code.Stfld)
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continue;
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var field = stfld.Operand as IField;
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if (!FieldEqualityComparer.CompareDeclaringTypes.Equals(enumField, field))
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continue;
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block.Remove(i, 3);
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i--;
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}
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}
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}
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}
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}
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