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@leommoore
leommoore / file_magic_numbers.md
Last active September 17, 2026 03:02
File Magic Numbers

File Magic Numbers

Magic numbers are the first bits of a file which uniquely identify the type of file. This makes programming easier because complicated file structures need not be searched in order to identify the file type.

For example, a jpeg file starts with ffd8 ffe0 0010 4a46 4946 0001 0101 0047 ......JFIF.....G ffd8 shows that it's a JPEG file, and ffe0 identify a JFIF type structure. There is an ascii encoding of "JFIF" which comes after a length code, but that is not necessary in order to identify the file. The first 4 bytes do that uniquely.

This gives an ongoing list of file-type magic numbers.

Image Files

@yoavniran
yoavniran / simple-nodejs-iv-encrypt-decrypt.js
Last active January 20, 2022 08:16
nodejs crypto - simple encrypt & decrypt using IV (Initialization Vector)
"use strict";
var crypto = require("crypto");
var EncryptionHelper = (function () {
function getKeyAndIV(key, callback) {
crypto.pseudoRandomBytes(16, function (err, ivBuffer) {
var keyBuffer = (key instanceof Buffer) ? key : new Buffer(key) ;
@staltz
staltz / introrx.md
Last active September 17, 2026 13:53
The introduction to Reactive Programming you've been missing
@tsiege
tsiege / The Technical Interview Cheat Sheet.md
Last active September 18, 2026 09:05
This is my technical interview cheat sheet. Feel free to fork it or do whatever you want with it. PLEASE let me know if there are any errors or if anything crucial is missing. I will add more links soon.

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






\

@darrikmazey
darrikmazey / EasySSLSocketFactory.java
Created March 13, 2014 02:52
package com.darmasoft.parental_informant;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
@johnhatvani
johnhatvani / UiButton+Block.
Last active October 10, 2021 04:34
Objective-c runtime fun -- A UIButton that takes a block as an action. The cool thing it does is it adds this action as an instance method at runtime.
#import <objc/runtime.h>
typedef void (^buttonAction)(UIButton *sender);
@implementation UIButton (BlockAction)
+ (UIButton *) buttonWithType:(UIButtonType)type andAction:(buttonAction)action forControlEvents:(UIControlEvents)controlEvents; {
UIButton * button = [UIButton buttonWithType:type];
// suppress undeclared selector warning or else '@selector(action:)' will complain.
@hofmannsven
hofmannsven / README.md
Last active August 26, 2026 09:06
MySQL CLI Cheatsheet
@aktau
aktau / imessage
Last active June 20, 2026 00:20
Send iMessage from the commandline
#!/bin/sh
if [ "$#" -eq 1 ]; then stdinmsg=$(cat); fi
exec <"$0" || exit; read v; read v; read v; exec /usr/bin/osascript - "$@" "$stdinmsg"; exit
-- another way of waiting until an app is running
on waitUntilRunning(appname, delaytime)
repeat until my appIsRunning(appname)
tell application "Messages" to close window 1
delay delaytime
end repeat
@DomiR
DomiR / Iphone.md
Last active October 22, 2021 00:05
Iphone passwordless ssh

Passwordless SSH

If you have no own key in ~/.ssh/ calld id_rsa.pub then create one:

ssh-keygen -t rsa

Copy the public file to the iphone

@ddrccw
ddrccw / hello.h
Created January 14, 2014 04:03
detect jailbreak
//
// Created by ddrccw on 14-1-10.
// Copyright (c) 2014年 ddrccw. All rights reserved.
// refer to http://danqingdani.blog.163.com/blog/static/1860941952012102122847478/
#import <sys/stat.h>
#import <mach-o/dyld.h>
//#import <stdlib.h>
//#import <string.h>