URLEncode With Objective C – The OAUTH Way

- (NSString *)urlencode:(NSString *)text {
    NSString *temp = @"";
 
    for(int i=0, max=[text length]; i<max; i++) {
        char t = [text characterAtIndex:i];
        int b = (int) t;
 
        if(
           t == (char) '.' ||
           t == (char) '_' ||
           t == (char) '-' ||
           t == (char) '~' ||
           t == (char) '#' ||
           (b>=0x30 && b<=0x39) ||
           (b>=0x41 && b<=0x5A) ||
           (b>=0x61 && b<=0x7A)
            ) {
            temp = [temp stringByAppendingFormat:@"%c", t];
        } else {
            temp = [temp stringByAppendingString:@"%"];
            if (b <= 0xf) temp = [temp stringByAppendingString:@"0"];
            temp = [NSString stringWithFormat:@"%@%X", temp, b];
        }
    }
 
    return temp;
}