gssc.mm

   1 /* UIKit Tools - command-line utilities for UIKit
   2  * Copyright (C) 2008-2012  Jay Freeman (saurik)
   3 */
   4
   5 /* Modified BSD License {{{ */
   6 /*
   7  *        Redistribution and use in source and binary
   8  * forms, with or without modification, are permitted
   9  * provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the
  12  *    above copyright notice, this list of conditions
  13  *    and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the
  15  *    above copyright notice, this list of conditions
  16  *    and the following disclaimer in the documentation
  17  *    and/or other materials provided with the
  18  *    distribution.
  19  * 3. The name of the author may not be used to endorse
  20  *    or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  25  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  34  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  35  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37 */
  38 /* }}} */
  39
  40 #import <GraphicsServices/GraphicsServices.h>
  41 #import <UIKit/UIKit.h>
  42 #include <stdio.h>
  43 #include <dlfcn.h>
  44 #include <objc/runtime.h>
  45
  46 static CFArrayRef (*$GSSystemCopyCapability)(CFStringRef);
  47 static CFArrayRef (*$GSSystemGetCapability)(CFStringRef);
  48
  49 void OnGSCapabilityChanged(
  50     CFNotificationCenterRef center,
  51     void *observer,
  52     CFStringRef name,
  53     const void *object,
  54     CFDictionaryRef info
  55 ) {
  56     CFRunLoopStop(CFRunLoopGetCurrent());
  57 }
  58
  59 int main(int argc, char *argv[]) {
  60     dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", RTLD_GLOBAL | RTLD_LAZY);
  61     dlopen("/System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices", RTLD_GLOBAL | RTLD_LAZY);
  62
  63     NSAutoreleasePool *pool = [[objc_getClass("NSAutoreleasePool") alloc] init];
  64
  65     NSString *name = nil;
  66
  67     if (argc == 2)
  68         name = [objc_getClass("NSString") stringWithUTF8String:argv[0]];
  69     else if (argc > 2) {
  70         fprintf(stderr, "usage: %s [capability]\n", argv[0]);
  71         exit(1);
  72     }
  73
  74     $GSSystemCopyCapability = reinterpret_cast<CFArrayRef (*)(CFStringRef)>(dlsym(RTLD_DEFAULT, "GSSystemCopyCapability"));
  75     $GSSystemGetCapability = reinterpret_cast<CFArrayRef (*)(CFStringRef)>(dlsym(RTLD_DEFAULT, "GSSystemGetCapability"));
  76
  77     CFNotificationCenterAddObserver(
  78         CFNotificationCenterGetDarwinNotifyCenter(),
  79         NULL,
  80         &OnGSCapabilityChanged,
  81         CFSTR("GSCapabilitiesChanged"),
  82         NULL,
  83         NULL
  84     );
  85
  86     const NSArray *capability;
  87
  88     for (;;) {
  89         if ($GSSystemCopyCapability != NULL) {
  90             capability = reinterpret_cast<const NSArray *>((*$GSSystemCopyCapability)(reinterpret_cast<CFStringRef>(name)));
  91             if (capability != nil)
  92                 capability = [capability autorelease];
  93         } else if ($GSSystemGetCapability != NULL) {
  94             capability = reinterpret_cast<const NSArray *>((*$GSSystemGetCapability)(reinterpret_cast<CFStringRef>(name)));
  95         } else {
  96             capability = nil;
  97             break;
  98         }
  99
 100         if (capability != nil)
 101             break;
 102
 103         CFRunLoopRun();
 104     }
 105
 106     printf("%s\n", capability == nil ? "(null)" : [[capability description] UTF8String]);
 107
 108     [pool release];
 109
 110     return 0;
 111 }