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Base 58 encode (used for flic.kr short urls)

/ Published in: ActionScript 3
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base 58 encoding in AS3 used to create a short url for flickr (flic.kr/p/) from a photo id. Function requires the flickr photo id to be passed in cast as a Number. Example below

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  1. /*
  2.  Function used to return flickr short url from a photo id.
  3.  example of usage
  4.  var shortFlickrURL:String = 'www.flic.kr/p/' + Base58Encoder.encode(Number('4725679319') );
  5. /// returns www.flic.kr/p/8cAkPD
  6. /// short url for this full url http://www.flickr.com/photos/ninjaparade/4725679319/
  7.  
  8.  
  9. */
  10.  
  11. package {
  12.  
  13. 	/**
  14. 	 * @author ninjaparade
  15. 	 */
  16. 	public class Base58Encoder {
  17.  
  18.  
  19. 		public static function encode( num : Number ) : String
  20. 		{
  21. 		var alphabet : String = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ' ;
  22. 			var base_count : int = alphabet.length;
  23. 			var encode : String = "";
  24. 			while(num >= base_count) {
  25. 				var div : int = num / base_count;
  26. 				var mod : int = (num - base_count * Math.round(div) );
  27. 				encode = alphabet.charAt(mod) + encode;
  28. 				num = Math.round(div);
  29. 			}
  30.  
  31. 			if(num) 
  32. 			{
  33. 				encode = alphabet.charAt(num) + encode;
  34. 			}
  35. 			return encode;
  36. 		}
  37. 	}
  38. }

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