Esempio manuale di codifica

input -> Hello World!
output -> SGVsbG8gV29ybGQh

01001000 01100101 01101100

primo 6 bit:
  BASE64[ (in[in_index] & 0xFC) >> 2 ];

secondo 6 bit:
  BASE64[ ((in[in_index] & 0x3) << 4) | ((in[in_index + 1] & 0xF0) >> 4) ]

terzo 6 bit:
  BASE64[ ((in[in_index + 1] & 0xF) << 2) | ((in[in_index + 2] & 0xC0) >> 6) ]

quarto 6 bit:
  BASE64[ in[in_index + 2] & 0x3F ];

---------------------------------------------

PADDING CASE n.1

input -> H
output -> SA==

01001000

primo 6 bit: 
  BASE64[ (in[in_index] & 0xFC) >> 2 ];

secondo 6 bit:
  BASE64[ ((in[in_index] & 0x3) << 4)]

terzo 6 bit:
  =

quarto 6 bit:
  =

---------------------------------------------

PADDING CASE n.2

input -> He
ouput -> SGU=

He -> 01001000 01100101 

primo 6 bit:
  BASE64[ (in[in_index] & 0xFC) >> 2 ];

secondo 6 bit:
  BASE64[ ((in[in_index] & 0x3) << 4) | ((in[in_index + 1] & 0xF0) >> 4) ]

terzo 6 bit:
  BASE64[ ((in[in_index + 1] & 0xF) << 2) ];

quarto 6 bit:
  = 

---------------------------------------------

DECODIFICA BASE 64

input -> SGVsbG8gV29ybGQh
output -> Hello World!

01010011 -> 83 -> S -> 18 -> 010010
01000111 -> 71 -> G -> 6 -> 000110
01010110 -> 86 -> V -> 21 -> 010101 
01110011 -> 115 -> s -> 44 -> 101100

010010 000110 010101 101100

01001000 -> 72 -> H
01100101 -> 101 -> e 
01101100 -> 108 -> l