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Posted By

szsk on 08/02/06


Tagged

javascript datascheme


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base64encode

Published in: JavaScript 

URL: http://www.onicos.com/staff/iz/amuse/javascript/expert/base64.txt

Plain TextExpand 
  1. if( btoa == undefined ) {
  2. 	var b64ec = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  3. 	var btoa = function( str ) {
  4. 		var out = "", i = 0, len = str.length;
  5. 		while( i < len ) {
  6. 		var c1 = str.charCodeAt( i++ ) & 0xff;
  7. 		if( i == len ) {
  8. 			out += b64ec.charAt( c1 >> 2 )
  9. 				+ b64ec.charAt( ( c1 & 0x3 ) << 4 )
  10. 				+ "==";
  11. 			break;
  12. 		}
  13. 		var c2 = str.charCodeAt( i++ );
  14. 		if( i == len ) {
  15. 			out += b64ec.charAt( c1 >> 2 )
  16. 				+ b64ec.charAt( ( ( c1 & 0x3 ) << 4 ) | ( ( c2 & 0xF0 ) >> 4 ) )
  17. 				+ b64ec.charAt( ( c2 & 0xF ) << 2 )
  18. 				+ "=";
  19. 			break;
  20. 		}
  21. 		var c3 = str.charCodeAt( i++ );
  22. 		out += b64ec.charAt( c1 >> 2 )
  23. 			+ b64ec.charAt( ( ( c1 & 0x3 ) << 4 ) | ( ( c2 & 0xF0 ) >> 4 ) )
  24. 			+ b64ec.charAt( ( ( c2 & 0xF ) << 2 ) | ( ( c3 & 0xC0 ) >> 6 ) )
  25. 			+ b64ec.charAt( c3 & 0x3F );
  26. 		}
  27. 		return out;
  28. 	}
  29. }

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