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NSString *urlencode(NSString *str){
	CFStringEncoding cfEncoding = kCFStringEncodingUTF8;
	str = (__bridge NSString *)CFURLCreateStringByAddingPercentEscapes(
		NULL,
		(CFStringRef)str,
		NULL,
		CFSTR("!*'();:@&=+$,/?%#[]"),
		cfEncoding
		);
	return str;
}

NSString *urldecode(NSString *str){
	CFStringEncoding cfEncoding = kCFStringEncodingUTF8;
	str = (__bridge NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding (
		NULL,
		(CFStringRef)str,
		CFSTR(""),
		cfEncoding
		);
	return str;
}

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