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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 GenericOptions
{
[Option('i', "infile", Required=true, HelpText="Input file to transform.")]
public string inputFile { get; set; }
[Option('o', "outfile", HelpText="File to write transformed data to.")]
public string outputFile { get; set; }
}
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 rp = new ReaderParameters {
ReadWrite = this.infile == this.outfile
};
this.module = ModuleDefinition.ReadModule(this.infile, rp);
}
public void save() {
if (this.outfile == this.infile)
this.module.Write();
else
this.module.Write(this.outfile);
}
}
[Verb("fix-filestreams", HelpText="Fix System.IO.FileStream constructors"
+" to open files read-only.")]
class FixFileStreamsCmd : GenericOptions {
[Value(0, Required=true, MetaName = "type", HelpText = "Types to patch.")]
public IEnumerable<string> typesToPatch { get; set; }
};
class FixFileStreams : Command {
public FixFileStreams(FixFileStreamsCmd options) : base(options) {
var filtered = this.module.Types
.Where(p => options.typesToPatch.Contains(p.Name));
foreach (var toPatch in filtered)
patch_type(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);
var ctorType = this.module.AssemblyReferences.Select(
x => new {
type = this.module.AssemblyResolver.Resolve(x)
.MainModule.GetType("System.IO.FileStream")
}
).Where(x => x.type != null).Select(x => x.type).First();
string wantedCtor = "System.Void System.IO.FileStream"
+ "::.ctor(System.String,"
+ "System.IO.FileMode,"
+ "System.IO.FileAccess)";
var newCtor = ctorType.GetConstructors()
.Single(x => x.ToString() == wantedCtor);
var refCtor = this.module.ImportReference(newCtor);
il.Replace(i, il.Create(OpCodes.Newobj, refCtor));
}
}
private void patch_type(TypeDefinition td) {
foreach (var nested in td.NestedTypes) patch_type(nested);
foreach (MethodDefinition md in td.Methods) patch_method(md);
}
}
public class patcher {
public static int Main(string[] args) {
Parser.Default.ParseArguments<GenericOptions, FixFileStreamsCmd>(args)
.WithParsed<FixFileStreamsCmd>(opts => new FixFileStreams(opts));
return 0;
}
}
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