OliverLetterer

@implementation XCDUUID

+ (void) load
{
    // query runtime if NSUUID class already exists, if so => done
    if (objc_getClass("NSUUID"))
    {
        return;
    }
    

OliverLetterer

typedef struct CAColorMatrix {
    float m11, m12, m13, m14, m15;
    float m21, m22, m23, m24, m25;
    float m31, m32, m33, m34, m35;
    float m41, m42, m43, m44, m45;
} CAColorMatrix;

@interface CAFilter : NSObject

@property(copy) NSString *name;

OliverLetterer

import Alamofire

let configuration = URLSessionConfiguration.default
configuration.requestCachePolicy = URLRequest.CachePolicy.reloadIgnoringLocalCacheData

let proxyConfiguration: [AnyHashable : Any] = [
    kCFNetworkProxiesHTTPEnable as AnyHashable: true,

    kCFNetworkProxiesHTTPProxy as AnyHashable: host,
    kCFNetworkProxiesHTTPPort as AnyHashable: port,

OliverLetterer

Reset WLAN interface to default values

• printer off
• hold tiny reset button on the back
• keep holding tiny reset button for around 20 seconds while powering on the printer

print current wireless settings

• printer on and booted
• hold tiny reset button for around 5 seconds

OliverLetterer

#import <mach/mach.h>

float cpu_usage()
{
    kern_return_t kr;
    task_info_data_t tinfo;
    mach_msg_type_number_t task_info_count;

    task_info_count = TASK_INFO_MAX;
    kr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &task_info_count);

OliverLetterer

Transparent Git Encryption

This document has been modified from its [original format][m1], which was written by Ning Shang (geek@cerias.net). It has been updated and reformatted into a [Markdown][m2] document by [Woody Gilk][m3] and [republished][m4].

Description

When working with a remote git repository which is hosted on a third-party storage server, data confidentiality sometimes becomes

OliverLetterer

// The trick is to copy the DeviceSupport folder from the beta to the stable version.

cp -r /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/10.0\ \(14A5261u\) /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/

// Then restart Xcode. You might need to do that for every beta of iOS 10/Xcode 8.

OliverLetterer

// Compile with clang -framework Foundation sethack.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

/*
 CFHashBytes from http://www.opensource.apple.com/source/CF/CF-1153.18/CFUtilities.c
 */
#define ELF_STEP(B) T1 = (H << 4) + B; T2 = T1 & 0xF0000000; if (T2) T1 ^= (T2 >> 24); T1 &= (~T2); H = T1;

OliverLetterer

//Given this:
NSArray *objects = @[@1, @2, @3]

//These are equivalent in behavior
NSNumber *first = [objects objectAtIndex:0]
NSNumber *second = (NSNumber *)CFArrayGetValueAtIndex(0)

//But is the code that runs the same? Not so much… in the first one we do…
objc_msgSend(objects, <selector reference>, 0)
-> http://sealiesoftware.com/msg/x86-mavericks.html

OliverLetterer

// Taken from http://PSPDFKit.com. This snippet is under public domain.
#define UIKitVersionNumber_iOS_7_0 0xB57
BOOL PSPDFIsUIKitFlatMode(void) {
    static BOOL isUIKitFlatMode = NO;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // We get the modern UIKit if system is running >= iOS 7 and we were linked with >= SDK 7.
        if (kCFCoreFoundationVersionNumber >= kCFCoreFoundationVersionNumber_iOS_7_0) {
            isUIKitFlatMode = (NSVersionOfLinkTimeLibrary("UIKit") >> 16) >= UIKitVersionNumber_iOS_7_0;
        }