Objective-C methods for percent-escaping NSString

gistfile1.m

// Objective-C methods for percent-escaping NSString, for use in NSURL.
// This approach does full escaping, instead of the 'smart' escaping that
// is provided by [NSString stringByReplacingPercentEscapesUsingEncoding:].
// License: Public Domain
// Author:  Leonard van Driel, 2012

@implementation NSString (EscapeForURL)

- (NSString *)escapeForURL
{
    return (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL, (__bridge CFStringRef)self, NULL, CFSTR("*'();:@&=+$,/?!%#[]"), kCFStringEncodingUTF8));
}

- (NSString *)unescapeForURL
{
    return (NSString *)CFBridgingRelease(CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL, (__bridge CFStringRef)self, CFSTR(""), kCFStringEncodingUTF8));
}

@end