86 lines
2.5 KiB
C#
86 lines
2.5 KiB
C#
using Mono.Cecil;
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using Mono.Cecil.Cil;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace IPA.Patcher
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{
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class PatchedModule
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{
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private const string ENTRY_TYPE = "Display";
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private FileInfo _File;
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private ModuleDefinition _Module;
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public static PatchedModule Load(string engineFile)
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{
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return new PatchedModule(engineFile);
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}
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private PatchedModule(string engineFile)
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{
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_File = new FileInfo(engineFile);
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LoadModules();
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}
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private void LoadModules()
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{
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var resolver = new DefaultAssemblyResolver();
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resolver.AddSearchDirectory(_File.DirectoryName);
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var parameters = new ReaderParameters
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{
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AssemblyResolver = resolver,
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};
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_Module = ModuleDefinition.ReadModule(_File.FullName, parameters);
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}
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public bool IsPatched
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{
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get
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{
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foreach (var @ref in _Module.AssemblyReferences)
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{
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if (@ref.Name == "IllusionInjector") return true;
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}
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return false;
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}
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}
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public void Patch()
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{
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// First, let's add the reference
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var nameReference = new AssemblyNameReference("IllusionInjector", new Version(1, 0, 0, 0));
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var injectorPath = Path.Combine(_File.DirectoryName, "IllusionInjector.dll");
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_Module.AssemblyReferences.Add(nameReference);
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var targetType = FindEntryType();
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if (targetType == null) throw new Exception("Couldn't find entry class. Aborting.");
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var targetMethod = targetType.Methods.FirstOrDefault(m => m.IsConstructor && m.IsStatic);
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if (targetMethod == null)
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{
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throw new Exception("Couldn't find entry method. Aborting.");
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}
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var injector = ModuleDefinition.ReadModule(injectorPath);
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var methodReference = _Module.Import(injector.GetType("IllusionInjector.Injector").Methods.First(m => m.Name == "Inject"));
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targetMethod.Body.Instructions.Insert(0, Instruction.Create(OpCodes.Call, methodReference));
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_Module.Write(_File.FullName);
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}
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private TypeDefinition FindEntryType()
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{
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return _Module.GetTypes().FirstOrDefault(m => m.Name == ENTRY_TYPE);
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}
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}
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}
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