fix iOS13 nsdata descrption

nsdata+hook.mm

void __attribute__((constructor)) constructor()
{
    [NSData load];
}

@implementation NSData (hook)
+(void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Method description = class_getInstanceMethod(self, @selector(description));
        Method hook_description = class_getInstanceMethod(self, @selector(hook_description));
        method_exchangeImplementations(description, hook_description);
    });
    
}
- (NSString *)hexadecimalString: (NSData *)data {
    const unsigned char *dataBuffer = (const unsigned char *)[data bytes];

    if (!dataBuffer) {
        return [NSString string];
    }

    NSUInteger dataLength  = [data length];
    NSMutableString *hexString  = [NSMutableString stringWithCapacity:(dataLength * 2)];

    for (int i = 0; i < dataLength; ++i) {
        if (i > 0 && i %16 == 0){
            [hexString appendString:@" "];
        }
        [hexString appendFormat:@"%02x", (unsigned int)dataBuffer[i]];
    }
    return [NSString stringWithString:hexString];
}
-(NSString*)hook_description {
    return [self hexadecimalString:self];
}
@end