Meta.m

#import "Meta.h"
#import <objc/runtime.h>

@implementation Meta

@synthesize info;

+(id)instance {
    static id _instance = nil;
    @synchronized(self) {
        if (!_instance) {
            _instance = [[self alloc] init];
            [_instance inject];
        }
    }
    return _instance;
}

typedef void (* func_imp)(NSObject *obj, SEL cmd, NSObject *camera, UIImage *image, UIImage *preview, NSData *jpg, NSDictionary *props);
static func_imp func_original;

static void func(NSObject *obj, SEL cmd, NSObject *camera, UIImage *image, UIImage *preview, NSData *jpg, NSDictionary *props) {
    Meta *meta = [Meta instance];
    meta.info = props;
    return func_original(obj, cmd, camera, image, preview, jpg, props);
}

-(void)inject {
    Class class = objc_getClass("PLCameraView");
    if (NULL != class) {
        Method method = class_getInstanceMethod(class, @selector(cameraController:tookPicture:withPreview:jpegData:imageProperties:));
        if (method) {
            func_original = (func_imp)method_setImplementation(method, (IMP)func);
            NSLog(@"installed metaclass");
        }
    }
}

-(void)dealloc {
    [info release];
    [super dealloc];
}

@end