 
 /** Base64Coding provides alphabet handling and base functionality
  to proof that the string is a valid base64 encoded string via
- `validityRegEX` (Regular expression tested on [RegExr](http://regexr.com/))
- and means to get a value for a given index and vice versa.
+ `validityRegEX` (Regular expression tested on [RegExr](http://regexr.com/)).
  */
 public enum Base64Coding {
-    case standard, urlSafe
+    /** The default when encoding/decoding(iOS compatible) */
+    case standard
+
+    /** to be used when dealing with URI */
+    case urlSafe
     
     var alphabet: [UInt8] {
         switch self {

        }
        return false
    }

}

private extension Base64Coding {
    var validityRegEx: NSRegularExpression? {
        switch self {
        case .standard:

}

public enum Base64Padding {
    /** Add padding character if necessary. */
    case on
    
    /** Omit the final padding step, once encoding is complete. */
    case off
}

public enum Base64Error: Error {
    /** Thrown when the input string contains characters not allowed for the given coding case. */
    case containsIllegalCharacters
    
    /** When alphabet handling fails. */
    case codingError
}

/** Provides base-64 en-/decoding for the standard and url safe alphabet.
