Frederik De Bleser fdb

Create Zed Quick Action for macOS

How to create a Quick Action in macOS that allows you to right-click any folder and open it directly in Zed editor.

Quick Action Script

#!/bin/bash

# Get the selected folder path from Automator

High-Performance Matrix Multiplication

This is a short post that explains how to write a high-performance matrix multiplication program on modern processors. In this tutorial I will use a single core of the Skylake-client CPU with AVX2, but the principles in this post also apply to other processors with different instruction sets (such as AVX512).

Intro

Matrix multiplication is a mathematical operation that defines the product of

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

Achieving warp speed with Rust

WannaCry|WannaDecrypt0r NSA-Cyberweapon-Powered Ransomware Worm

Virus Name: WannaCrypt, WannaCry, WanaCrypt0r, WCrypt, WCRY
Vector: All Windows versions before Windows 10 are vulnerable if not patched for MS-17-010. It uses EternalBlue MS17-010 to propagate.
Ransom: between $300 to $600. There is code to 'rm' (delete) files in the virus. Seems to reset if the virus crashes.
Backdooring: The worm loops through every RDP session on a system to run the ransomware as that user. It also installs the DOUBLEPULSAR backdoor. It corrupts shadow volumes to make recovery harder. (source: malwarebytes)
Kill switch: If the website www.iuqerfsodp9ifjaposdfjhgosurijfaewrwergwea.com is up the virus exits instead of infecting the host. (source: malwarebytes). This domain has been sinkholed, stopping the spread of the worm. Will not work if proxied (source).

update: A minor variant of the viru

	// type i
	message DAMFile {
	repeated Chunk chunk = 1;
	repeated QuantizedChunk quantized_chunk = 2;
	}

	// type "o"
	message Chunk {
	required Vertices vertices = 1;
	required Faces faces = 2;

	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>

	// munged from https://github.com/simontime/Resead

	namespace sead
	{
	class Random
	{

	// This file is automatically generated, but you can add your own variables here too.
	// Syntax: SET_VAR(variable_name, default, low_limit, upper_limit, slider_exponent)
	// In code you can read the variable with: GET_VAR(variable_name)
	SET_VAR(tower_height, 520.0f, 0.0f, 3000.0f, 1.0f)
	SET_VAR(KSpring, 520.0f, 1.0f, 3000.0f, 1.0f)
	SET_VAR(WireRadius, 2.0f, 0.1f, 34.0f, 1.0f)
	SET_VAR(volcanic_sun_x, 0.088000, -20.0f, 20.0f, 1.0f)
	SET_VAR(mothership_sun_x, 2.026000, -5.0f, 5.0f, 1.0f)
	SET_VAR(mothership_sun_y, 0.507000, -5.0f, 5.0f, 1.0f)
	SET_VAR(wire_fog_exp, 0.0f, 0.0f, 100.0f, 1.0f)

	[package]
	name = "procaddress"
	version = "0.1.0"
	authors = []

	[dependencies]
	libc = "0.2.33"

	extern crate minifb;
	extern crate time;

	use minifb::{Key, Scale, WindowOptions, Window};

	use std::f64::consts::PI;

	fn circle(x: f64, y: f64, x_offset: f64, y_offset: f64, rad: f64) -> bool {
	let x_distance = x - x_offset;
	let y_distance = y - y_offset;