blogs on geni.site

Fast signature scanning with SIMD instructions

me@geni.site (geni) — Mon, 29 Dec 2025 03:55:00 +0200

Introduction

Ever thought “my signature scanner takes too long!”? Well, you’re probably alone.

Anti-anti-piracy and hiding from GetModuleHandle

me@geni.site (geni) — Wed, 24 Dec 2025 22:01:37 +0200

This has certainly been done before. It’s also most certainly been done better, as this will only hide the module from GetModuleHandle and there are plenty other ways left to find it. This is done and written more as a fun and educational exercise; a restriction I placed on myself going into this was to not look up “how to hide module from GetModuleHandle” on Google.

Introduction

While trying to play R.E.P.O. using the RepoXR mod yesterday, the game would mysteriously crash on startup. The last message it would output in the log was [Info :OpenXR Loader] Attempting to initialize OpenXR on SteamVR before the Unity crash handler would show up on screen.

Fixing CS:GO startup times on Windows 11

me@geni.site (geni) — Sun, 04 Dec 2022 13:40:36 +0200

Introduction

Despite having downgraded to Windows 11 a few months ago, I never really noticed how long CS:GO took to launch, likely because I had it on an HDD prior. But one day I saw a post on r/GlobalOffensive complaining about how long the game takes to boot on Windows 11, and I quickly realized it wasn’t meant to take as long as it does.

Inspired by the excellent write-up on reducing GTA Online load times, regardless of my limited reverse engineering experience, I decided to dig deeper.