Not correct decode

[Vladzimir]

Not correct decode goto and multi label.
lab1:
lab2:
lab3:

[simon816]

Hi, it is unclear what the problem is from your description. Could you share a snippet of code that doesn't deobfuscate well?

[Vladzimir]

encode file https://pastebin.com/FCiBc6Yc
decode file https://pastebin.com/egh6SW8s
Constant glue

        /* $f = DIR_SYSTEM . "library/adw/autofield.php"; */
        $f = "DIR_SYSTEMlibrary/adw/autofield.php";

End goto not full decode

    protected function validate()
    {
        if ($this->user->hasPermission("modify", "extension/module/autofield")) {
            goto Kk5SZ;
        }
        $this->error["warning"] = $this->language->get("error_permission");
        Kk5SZ:
        return !$this->error;
    }

[simon816]

I see. The obfuscation in that file appears to rewrite if/else into ifs and gotos.
I'll see if I can convert them back to if/else. Hopefully the code is more readable so you can manually follow the control flow.

The reason why DIR_SYSTEM is being concatenated to the string is because it's emulating PHP's behaviour where undefined constants become the string value of it's name.
example:

<?php

echo "VALUE: " . DIR_SYSTEM;

Demo: https://3v4l.org/trpHp

Warning: Use of undefined constant DIR_SYSTEM - assumed 'DIR_SYSTEM' (this will throw an Error in a future version of PHP) in /in/trpHp on line 3
VALUE: DIR_SYSTEM

If you define the constant, it will concatenate it, e.g:

<?php

define('DIR_SYSTEM', '/');

echo DIR_SYSTEM . "library/adw/autofield.php";

Becomes:

<?php

define('DIR_SYSTEM', '/');
echo "/library/adw/autofield.php";

[Vladzimir]

Thanks for answers.