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using System.Collections.Generic;
using System.IO;
using System.Linq;
using System;
using Mono.Cecil.Cil;
using Mono.Cecil.Rocks;
using Mono.Cecil;
using CommandLine;
class Command {
protected string infile;
protected string outfile;
protected ModuleDefinition module;
public Command(GenericOptions options) {
if (options.outputFile == null)
this.outfile = options.inputFile;
else
this.outfile = options.outputFile;
this.infile = options.inputFile;
var readOnly = this.infile != this.outfile;
this.module = this.read_module(this.infile, readOnly);
}
private IEnumerable<MethodDefinition> get_methods(TypeDefinition td) {
return td.NestedTypes
.SelectMany(n => this.get_methods(n))
.Union(td.Methods);
}
protected IEnumerable<MethodDefinition> getm(IEnumerable<string> types) {
var needles = types
.Select(t => t.Split(new[] { "::" }, 2, StringSplitOptions.None));
foreach (var n in needles) {
var filtered = this.module.Types.Where(p => p.Name == n[0]);
var methods = filtered.SelectMany(t => this.get_methods(t));
var found = false;
if (n.Length == 1) {
foreach (var m in methods)
yield return m;
found = true;
} else {
foreach (var m in methods) {
if (m.Name == n[1]) {
found = true;
yield return m;
}
}
}
if (!found) {
var thetype = string.Join("::", n);
throw new Exception($"Type {thetype} not found.");
}
}
}
protected ModuleDefinition read_module(string path, bool readOnly) {
var resolver = new DefaultAssemblyResolver();
resolver.AddSearchDirectory(Path.GetDirectoryName(path));
var rp = new ReaderParameters {
ReadWrite = !readOnly,
AssemblyResolver = resolver
};
return ModuleDefinition.ReadModule(path, rp);
}
protected virtual IEnumerable<TypeDefinition> get_assembly_types() {
return this.module.AssemblyReferences
.Select(a => this.module.AssemblyResolver.Resolve(a))
.SelectMany(r => r.MainModule.Types);
}
protected MethodReference find_method_ref(string fullSig) {
foreach (var type in this.get_assembly_types()) {
foreach (var ctor in type.GetConstructors()) {
if (ctor.ToString() != fullSig) continue;
return this.module.ImportReference(ctor);
}
foreach (var meth in type.GetMethods()) {
if (meth.ToString() != fullSig) continue;
return this.module.ImportReference(meth);
}
}
throw new Exception($"Method reference for {fullSig} not found.");
}
public void save() {
if (this.outfile == this.infile)
this.module.Write();
else
this.module.Write(this.outfile);
}
}
class FixFileStreams : Command {
private MethodReference betterFileStream;
public FixFileStreams(FixFileStreamsCmd options) : base(options) {
this.betterFileStream = this.find_method_ref(
"System.Void System.IO.FileStream::.ctor" +
"(System.String,System.IO.FileMode,System.IO.FileAccess)"
);
foreach (var toPatch in this.getm(options.typesToPatch))
patch_method(toPatch);
this.save();
}
private void patch_method(MethodDefinition md) {
var il = md.Body.GetILProcessor();
var fileStreams = md.Body.Instructions
.Where(i => i.OpCode == OpCodes.Newobj)
.Where(i => (i.Operand as MethodReference).DeclaringType
.FullName == "System.IO.FileStream");
foreach (Instruction i in fileStreams.ToList()) {
var fileAccessRead = il.Create(OpCodes.Ldc_I4_1);
il.InsertBefore(i, fileAccessRead);
il.Replace(i, il.Create(OpCodes.Newobj, this.betterFileStream));
}
}
}
class ReplaceCall : Command {
private string search;
private MethodReference replace;
private ModuleDefinition targetModule;
private bool patch_done;
public ReplaceCall(ReplaceCallCmd options) : base(options) {
if (options.assemblyFile != null)
this.targetModule = this.read_module(options.assemblyFile, true);
this.search = options.replaceMethod;
this.replace = this.find_method_ref(options.replacementMethod);
this.patch_done = false;
foreach (var toPatch in this.getm(options.typesToPatch))
patch_method(toPatch);
if (!this.patch_done) {
var types = string.Join(", ", options.typesToPatch);
throw new Exception($"Unable to find {this.search} in {types}.");
}
this.save();
}
protected override IEnumerable<TypeDefinition> get_assembly_types() {
if (this.targetModule != null)
return this.targetModule.Types;
else
return base.get_assembly_types();
}
private void patch_method(MethodDefinition md) {
var il = md.Body.GetILProcessor();
var found = md.Body.Instructions
.Where(i => i.OpCode == OpCodes.Call)
.Where(i => i.Operand.ToString() == this.search);
foreach (Instruction i in found.ToList()) {
il.Replace(i, il.Create(OpCodes.Call, this.replace));
this.patch_done = true;
}
}
}
public class patcher {
public static int Main(string[] args) {
var parser = new Parser((settings) => {
settings.EnableDashDash = true;
settings.HelpWriter = Console.Error;
// XXX: When not running in a terminal the width is 0, but the
// CommandLine library expects it to be greater than zero.
if (Console.WindowWidth == 0)
settings.MaximumDisplayWidth = 80;
});
var retval = 0;
parser.ParseArguments<FixFileStreamsCmd, ReplaceCallCmd>(args)
.WithParsed<FixFileStreamsCmd>(opts => new FixFileStreams(opts))
.WithParsed<ReplaceCallCmd>(opts => new ReplaceCall(opts))
.WithNotParsed(_ => retval = 1);
return retval;
}
}
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