#import "NSString+QueryString.h"

@implementation NSString (QueryString)

- (NSString*)stringByEscapingForURLQuery

{

NSString *result = self;

CFStringRef originalAsCFString = (__bridge CFStringRef) self;

CFStringRef leaveAlone = CFSTR(" ");

CFStringRef toEscape = CFSTR("\n\r?[]()$,!'*;:@&=#%+/");

CFStringRef escapedStr;

escapedStr = CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, originalAsCFString, leaveAlone, toEscape, kCFStringEncodingUTF8);

if (escapedStr) {

NSMutableString *mutable = [NSMutableString stringWithString:(__bridge NSString *)escapedStr];

CFRelease(escapedStr);

[mutable replaceOccurrencesOfString:@" " withString:@"+" options:0 range:NSMakeRange(0, [mutable length])];

result = mutable;

}

return result;

}

- (NSString*)stringByUnescapingFromURLQuery

{

return [[self stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding] stringByReplacingOccurrencesOfString:@"+" withString:@" "];

}