1 ! Copyright (C) 2008 Doug Coleman, Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: combinators io io.binary io.encodings.binary
4 io.streams.byte-array kernel math namespaces
5 sequences strings io.crlf ;
8 ERROR: malformed-base64 ;
12 : read1-ignoring ( ignoring -- ch )
13 read1 2dup swap member? [ drop read1-ignoring ] [ nip ] if ;
15 : read-ignoring ( ignoring n -- str )
16 [ drop read1-ignoring ] with map harvest
17 [ f ] [ >string ] if-empty ;
19 : ch>base64 ( ch -- ch )
20 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
23 : base64>ch ( ch -- ch )
25 f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f
26 f f f f f f f f f f 62 f f f 63 52 53 54 55 56 57 58 59 60 61 f f
27 f 0 f f f 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
28 22 23 24 25 f f f f f f 26 27 28 29 30 31 32 33 34 35 36 37 38 39
29 40 41 42 43 44 45 46 47 48 49 50 51
30 } nth [ malformed-base64 ] unless* ; inline
34 : write1-lines ( ch -- )
37 1+ [ 76 = [ crlf ] when ]
38 [ 76 mod column set ] bi
41 : write-lines ( str -- )
42 [ write1-lines ] each ;
46 -6 * shift HEX: 3f bitand ch>base64 write1-lines
49 : encode-pad ( seq n -- )
50 [ 3 0 pad-tail binary [ encode3 ] with-byte-writer ]
51 [ 1+ ] bi* head-slice 4 CHAR: = pad-tail write-lines ; inline
54 [ 0 [ base64>ch swap 6 shift bitor ] reduce 3 >be ]
55 [ [ CHAR: = = ] count ] bi head-slice*
56 [ write1 ] each ; inline
60 : encode-base64 ( -- )
63 { 3 [ encode3 encode-base64 ] }
64 [ encode-pad encode-base64 ]
67 : encode-base64-lines ( -- )
68 0 column [ encode-base64 ] with-variable ;
70 : decode-base64 ( -- )
71 "\n\r" 4 read-ignoring dup length {
73 { 4 [ decode4 decode-base64 ] }
77 : >base64 ( seq -- base64 )
78 binary [ binary [ encode-base64 ] with-byte-reader ] with-byte-writer ;
80 : base64> ( base64 -- seq )
81 binary [ binary [ decode-base64 ] with-byte-reader ] with-byte-writer ;
83 : >base64-lines ( seq -- base64 )
84 binary [ binary [ encode-base64-lines ] with-byte-reader ] with-byte-writer ;