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49 lines
1.5 KiB
C#
49 lines
1.5 KiB
C#
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/*
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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 System.Collections.Generic;
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using dnlib.DotNet.Emit;
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namespace de4dot.blocks.cflow {
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// If a block is just a dup followed by a bcc, try to append the block
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// to all its sources. Will fix some SA assemblies.
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class DupBlockCflowDeobfuscator : BlockDeobfuscator {
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protected override bool Deobfuscate(Block block) {
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if (block.Instructions.Count != 2)
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return false;
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if (block.Instructions[0].OpCode.Code != Code.Dup)
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return false;
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if (!block.LastInstr.IsConditionalBranch() && block.LastInstr.OpCode.Code != Code.Switch)
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return false;
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bool modified = false;
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foreach (var source in new List<Block>(block.Sources)) {
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if (source.GetOnlyTarget() != block)
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continue;
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if (!source.CanAppend(block))
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continue;
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source.Append(block);
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modified = true;
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}
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return modified;
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}
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}
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}
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