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using Mono.Cecil;
using Mono.Cecil.Cil;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
namespace IPA.Patcher
{
internal class PatchedModule
{
private static readonly string[] EntryTypes = { "Input", "Display" };
private readonly FileInfo _file;
private ModuleDefinition _module;
internal struct PatchData {
public bool IsPatched;
public Version Version;
}
public static PatchedModule Load(string engineFile)
{
return new PatchedModule(engineFile);
}
private PatchedModule(string engineFile)
{
_file = new FileInfo(engineFile);
LoadModules();
}
private void LoadModules()
{
var resolver = new DefaultAssemblyResolver();
resolver.AddSearchDirectory(_file.DirectoryName);
var parameters = new ReaderParameters
{
AssemblyResolver = resolver,
};
_module = ModuleDefinition.ReadModule(_file.FullName, parameters);
}
public PatchData Data
{
get
{
var data = new PatchData { IsPatched = false, Version = null };
foreach (var @ref in _module.AssemblyReferences) {
switch (@ref.Name)
{
case "IllusionInjector":
case "IllusionPlugin":
data = new PatchData { IsPatched = true, Version = new Version(0, 0, 0, 0) };
break;
case "IPA.Injector":
return new PatchData { IsPatched = true, Version = @ref.Version };
}
}
return data;
}
}
public void Patch(Version v)
{
// First, let's add the reference
var nameReference = new AssemblyNameReference("IPA.Injector", v);
var injectorPath = Path.Combine(_file.DirectoryName ?? throw new InvalidOperationException(), "IPA.Injector.dll");
var injector = ModuleDefinition.ReadModule(injectorPath);
bool hasIPAInjector = false;
for (int i = 0; i < _module.AssemblyReferences.Count; i++)
{
if (_module.AssemblyReferences[i].Name == "IllusionInjector")
_module.AssemblyReferences.RemoveAt(i--);
if (_module.AssemblyReferences[i].Name == "IllusionPlugin")
_module.AssemblyReferences.RemoveAt(i--);
if (_module.AssemblyReferences[i].Name == "IPA.Injector")
{
hasIPAInjector = true;
_module.AssemblyReferences[i].Version = v;
}
}
if (!hasIPAInjector)
{
_module.AssemblyReferences.Add(nameReference);
int patched = 0;
foreach (var type in FindEntryTypes())
{
if (PatchType(type, injector))
{
patched++;
}
}
if (patched > 0)
{
_module.Write(_file.FullName);
}
else
{
throw new Exception("Could not find any entry type!");
}
}
else
{
_module.Write(_file.FullName);
}
}
private bool PatchType(TypeDefinition targetType, ModuleDefinition injector)
{
var targetMethod = targetType.Methods.FirstOrDefault(m => m.IsConstructor && m.IsStatic);
if (targetMethod != null)
{
var methodReference = _module.ImportReference(injector.GetType("IPA.Injector.Injector").Methods.First(m => m.Name == "Inject"));
targetMethod.Body.Instructions.Insert(0, Instruction.Create(OpCodes.Call, methodReference));
return true;
}
return false;
}
private IEnumerable<TypeDefinition> FindEntryTypes()
{
return _module.GetTypes().Where(m => EntryTypes.Contains(m.Name));
}
}
}