URL-Safe Base64 encoding in Swift

This repository provides a class file for easy and fast encoding and decoding with standard Base64. It removes the "/" and "+" characters from the standard Base64 implementation and replaces them with "-" and "_" as decribed by the 'base64url' standard.

Copy the class file into your project and call it directly to use it.

Encoding Data

The data provided to the function must be an array of UInt8. There is a built in initiliser to turn a Data object into this form.

let data: [UInt8] = [1, 2, 3]
let encodedData = Base64FS.encode(data: data)

or

let data: Data = ...
let dataInCorrectFormat = [UInt8](data)
let encodedData = Base64FS.encode(data: dataInCorrectFormat)

Encoding Strings

For common use cases with filenames and URLs, you can use a string method directly as shown:

let str = "Hello, World"
let encodedString = Base64FS.encodeString(str: str)

Decoding

In an almost identical fasion to the two previous examples, you use the following two functions:

Data

let encodedData = ...
let encodedDataInCorrectFormat  = [UInt8](encodedData)
let decodedData = Base64FS.decode(data: encodedDataInCorrectFormat)

String

let encodedStr = ...
let decodedString = Base64FS.decodeString(str: encodedStr)