Icorrect decompilation of obfuscated code

[Scott Shuppert]

This IL code:

.method public hidebysig virtual
    instance void GetObjectData (
        class [mscorlib]System.Runtime.Serialization.SerializationInfo info,
        valuetype [mscorlib]System.Runtime.Serialization.StreamingContext context
    ) cil managed
{
    .permissionset demand = {
        [mscorlib]System.Security.Permissions.SecurityPermissionAttribute = {
            property bool SerializationFormatter = bool(true)
        }
    }
    IL_0000: ldarg.1
    IL_0001: brtrue.s IL_001d

    IL_0003: ldc.i4.1
    IL_0004: br.s IL_0009

    IL_0006: ldc.i4.0
    IL_0007: br.s IL_0009

    IL_0009: brfalse.s IL_000b

    IL_000b: br.s IL_000d

    IL_000d: ldstr "info"
    IL_0012: ldstr "Argument 'info' cannot be null."
    IL_0017: newobj instance void [mscorlib]System.ArgumentNullException::.ctor(string,  string)
    IL_001c: throw

    IL_001d: ldarg.1
    IL_001e: ldstr "type"
    IL_0023: ldarg.0
    IL_0024: ldfld class [mscorlib]System.Type Atalasoft.Imaging.AtalasoftLicenseException::b
    IL_0029: callvirt instance void [mscorlib]System.Runtime.Serialization.SerializationInfo::AddValue(string,  object)
    IL_002e: ldarg.0
    IL_002f: ldarg.1
    IL_0030: ldarg.2
    IL_0031: call instance void [mscorlib]System.Exception::GetObjectData(class [mscorlib]System.Runtime.Serialization.SerializationInfo,  valuetype [mscorlib]System.Runtime.Serialization.StreamingContext)
    IL_0036: ret
}

decompiled as:

[SecurityPermission(SecurityAction.Demand, SerializationFormatter=true)]
public override void GetObjectData(SerializationInfo info, StreamingContext context)
{
    if (info != null)
    {
        info.AddValue("type", this.b);
        base.GetObjectData(info, context);
        return;
    }
    else
    {
        bool flag = true;
        !flag;
        throw new ArgumentNullException("info", "Argument 'info' cannot be null.");
    }
}

Hint: strange !flag; line of code.

[Yordan Dikov]

Hi Scott,

 Please excuse me for the delayed response. At the moment we don't support decompilation of obfuscated code, so statements like this are not a rare case. However, we've logged the issue and we'll definitely try to fix it at some later stage. Stay tuned for updates and don't hesitate to contact us about anything else that bothers you in JustDecompile.

Regards,
Yordan Dikov
the Telerik team