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#import <GraphicsServices/GraphicsServices.h>
#import <UIKit/UIKit.h>
#include <stdio.h>
#include <dlfcn.h>
#include <objc/runtime.h>
static CFArrayRef (*$GSSystemCopyCapability)(CFStringRef);
static CFArrayRef (*$GSSystemGetCapability)(CFStringRef);
void OnGSCapabilityChanged(
CFNotificationCenterRef center,
void *observer,
CFStringRef name,
const void *object,
CFDictionaryRef info
) {
CFRunLoopStop(CFRunLoopGetCurrent());
}
int main(int argc, char *argv[]) {
dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", RTLD_GLOBAL | RTLD_LAZY);
dlopen("/System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices", RTLD_GLOBAL | RTLD_LAZY);
NSAutoreleasePool *pool = [[objc_getClass("NSAutoreleasePool") alloc] init];
NSString *name = nil;
if (argc == 2)
name = [objc_getClass("NSString") stringWithUTF8String:argv[0]];
else if (argc > 2) {
fprintf(stderr, "usage: %s [capability]\n", argv[0]);
exit(1);
}
$GSSystemCopyCapability = reinterpret_cast<CFArrayRef (*)(CFStringRef)>(dlsym(RTLD_DEFAULT, "GSSystemCopyCapability"));
$GSSystemGetCapability = reinterpret_cast<CFArrayRef (*)(CFStringRef)>(dlsym(RTLD_DEFAULT, "GSSystemGetCapability"));
CFNotificationCenterAddObserver(
CFNotificationCenterGetDarwinNotifyCenter(),
NULL,
&OnGSCapabilityChanged,
CFSTR("GSCapabilitiesChanged"),
NULL,
NULL
);
const NSArray *capability;
for (;;) {
if ($GSSystemCopyCapability != NULL) {
capability = reinterpret_cast<const NSArray *>((*$GSSystemCopyCapability)(reinterpret_cast<CFStringRef>(name)));
if (capability != nil)
capability = [capability autorelease];
} else if ($GSSystemGetCapability != NULL) {
capability = reinterpret_cast<const NSArray *>((*$GSSystemGetCapability)(reinterpret_cast<CFStringRef>(name)));
} else {
capability = nil;
break;
}
if (capability != nil)
break;
CFRunLoopRun();
}
printf("%s\n", capability == nil ? "(null)" : [[capability description] UTF8String]);
[pool release];
return 0;
}
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