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via Reverse Engineering

Mach-O reader - parsing Mach-O headers

In this article we will try to write a command-line tool in Swift, which is able to parse Mach-O file and read Mach-O headers.

Understanding iOS application entry point

Are you wondering what is the application entry point? How the OS knows where to find an entry point? What @UIApplicationMain attribute does? What's hidden behind the UIApplicationMain method? If you want to know the answer to those questions, you should probably read this article.