leptos-null

This article aims to describe how to hook Swift functions.

Thanks to help from @NightwindDev for discussion and testing.

Overall, the idea is simple: Write our own Swift code that will have the same calling convention as the target code, then get a pointer to our own code and the target code, and call MSHookFunction with these values.

Code

leptos-null

//
//  Created by Leptos on 12/25/19.
//  Copyright © 2019 Leptos. All rights reserved.
//

#import <stdio.h>
#import <fcntl.h>
#import <unistd.h>
#import <ctype.h>

leptos-null

I was reviewing my GitHub gists and saw this:

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

#pragma clang diagnostic ignored "-Wformat-security"

int main() {
    /* 4 bytes (chars)

leptos-null

import sys

FAT_MAGIC = b'\xca\xfe\xba\xbe' # big endian
FAT_MAGIC_64 = b'\xca\xfe\xba\xbf' # big endian

MH_MAGIC_64 = b'\xfe\xed\xfa\xcf' # big endian
MH_CIGAM_64 = b'\xcf\xfa\xed\xfe' # little endian

CPU_TYPE_ARM64 = b'\x01\x00\x00\x0c' # big endian
CPU_SUBTYPE_IOS13 = b'\x00\x00\x00\x02' # big endian

leptos-null

import Foundation

struct OrderedSet<Element: Hashable>: Sequence {
    private var order: [Element]
    private var membership: Set<Element>
    
    func makeIterator() -> IndexingIterator<Array<Element>> {
        order.makeIterator()
    }
    

leptos-null

import Foundation

func redirectStdout(to path: String) throws {
    let (openResult, posixErrorCode) = path.withCString {
        // idea thanks to https://github.com/leptos-null/ClassDumpRuntime/blob/31e3601/classdumpctl/main.m#L456-L459
        // error checking thanks to https://github.com/leptos-null/Forest/blob/ba4b89a/Shared/Tar.swift#L172-L174
        let result = open($0, O_WRONLY | O_CREAT | O_TRUNC, 0o644)
        let globalError = errno // copy errno since it may change before we access it again later
        return (result, globalError)
    }

leptos-null

import SwiftUI

extension ForEach {
    init<Base: Sequence>(enumerated base: Base, @ViewBuilder content: @escaping (Data.Element) -> Content) where Data == Array<EnumeratedSequence<Base>.Element>, ID == Base.Element, Content: View, ID: Identifiable {
        self.init(Array(base.enumerated()), id: \.element, content: content)
    }
    init<Base: Sequence>(enumerated base: Base, id: KeyPath<Base.Element, ID>, @ViewBuilder content: @escaping (Data.Element) -> Content) where Data == Array<EnumeratedSequence<Base>.Element>, Content: View {
        let basePath: KeyPath<EnumeratedSequence<Base>.Element, Base.Element> = \.element
        self.init(Array(base.enumerated()), id: basePath.appending(path: id), content: content)
    }

leptos-null

Red Cross Blood REST API Reference

This guide is based on research from version 1.7.3 of Red Cross Blood iOS app.

Host: blood.arc.cubeapis.com

This reference is for version 2.1 of the interface.

Authentication

leptos-null

Keybase proof

I hereby claim:

• I am leptos-null on github.
• I am leptos_null (https://keybase.io/leptos_null) on keybase.
• I have a public key ASA0dcmIggGRcMrdxDzFRDAutr7TdLveEOWsHbCkWeWN0Qo

To claim this, I am signing this object:

leptos-null

static NSDate *watchPreviewDate() {
    static NSDateComponents *comps;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        comps = [NSDateComponents new];
        comps.calendar = NSCalendar.autoupdatingCurrentCalendar;
        comps.timeZone = NSTimeZone.localTimeZone;
        comps.year = 2014;
        comps.month = 9;
        comps.day = 9;