XXIIVV

Base64 is designed to carry data stored in binary formats across channels that only support text content.

Base64 is a binary-to-text encoding scheme that represents arbitrary binary data as 6-bit digits.

Index Binary Char Index Binary Char Index Binary Char Index Binary Char
0 000000 A 16 010000 Q 32 100000 g 48 110000 w
1 000001 B 17 010001 R 33 100001 h 49 110001 x
2 000010 C 18 010010 S 34 100010 i 50 110010 y
3 000011 D 19 010011 T 35 100011 j 51 110011 z
4 000100 E 20 010100 U 36 100100 k 52 110100 0
5 000101 F 21 010101 V 37 100101 l 53 110101 1
6 000110 G 22 010110 W 38 100110 m 54 110110 2
7 000111 H 23 010111 X 39 100111 n 55 110111 3
8 001000 I 24 011000 Y 40 101000 o 56 111000 4
9 001001 J 25 011001 Z 41 101001 p 57 111001 5
10 001010 K 26 011010 a 42 101010 q 58 111010 6
11 001011 L 27 011011 b 43 101011 r 59 111011 7
12 001100 M 28 011100 c 44 101100 s 60 111100 8
13 001101 N 29 011101 d 45 101101 t 61 111101 9
14 001110 O 30 011110 e 46 101110 u 62 111110 +
15 001111 P 31 011111 f 47 101111 v 63 111111 /
Padding =

Example

Many hands make light work.

When the quote is encoded into Base64, it is represented as a byte sequence of 8-bit-padded ASCII characters encoded in MIME's Base64 scheme as follows:

TWFueSBoYW5kcyBtYWtlIGxpZ2h0IHdvcmsu

Uxntal Implementation

@stream ( byte -- )
	,&buf STR
	#0800
	&l
		[ LIT &buf $1 ] OVR #07 SWP SUB SFT #01 AND
		[ LIT &inc $1 ] INCk #06 DIVk MUL SUB ,&inc STR
		( bit id -- )
		SWP .queue LDZ ORA DUP ADD .queue STZ
		#05 NEQ ?&no-cap
			[ LIT2 00 -queue ]
				DUP2 LDZ #01 SFT ;MIME ADD2 LDA #18 DEO
				STZ
			&no-cap
		INC GTHk ?&l
	POP2
JMP2r

@MIME [
	"ABCDEFGHIJKLMNOP
	"QRSTUVWXYZabcdef
	"ghijklmnopqrstuv
	"wxyz0123456789+/ ]