1 ! Copyright (C) 2008 Doug Coleman, Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: combinators fry io io.binary io.encodings.binary
4 io.streams.byte-array kernel math namespaces sbufs
8 ERROR: malformed-base64 ;
12 : read1-ignoring ( ignoring stream -- ch )
13 dup stream-read1 pick dupd member?
14 [ drop read1-ignoring ] [ 2nip ] if ; inline recursive
16 : push-ignoring ( accum ch -- accum )
17 dup { f 0 } member-eq? [ drop ] [ over push ] if ; inline
19 : read-ignoring ( n ignoring stream -- str/f )
20 [ [ <sbuf> ] keep ] 2dip
21 '[ _ _ read1-ignoring push-ignoring ] times
22 [ f ] [ "" like ] if-empty ; inline
24 : ch>base64 ( ch -- ch )
25 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
28 : base64>ch ( ch -- ch )
30 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
31 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
32 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
33 22 23 24 25 f f f f f f 26 27 28 29 30 31 32 33 34 35 36 37 38 39
34 40 41 42 43 44 45 46 47 48 49 50 51
35 } nth [ malformed-base64 ] unless* ; inline
39 : write1-lines ( column/f ch stream -- column' )
40 [ stream-write1 ] keep swap [
42 '[ 76 = [ B{ CHAR: \r CHAR: \n } _ stream-write ] when ]
46 : write-lines ( str -- )
47 column output-stream get '[
48 swap [ _ write1-lines ] each
52 column output-stream get '[
53 swap be> { -18 -12 -6 0 } [
54 shift 0x3f bitand ch>base64 _ write1-lines
58 : encode-pad ( seq n -- )
59 [ 3 0 pad-tail binary [ encode3 ] with-byte-writer ]
60 [ 1 + ] bi* head-slice 4 CHAR: = pad-tail write-lines ; inline
63 [ 0 [ base64>ch swap 6 shift bitor ] reduce 3 >be ]
64 [ [ CHAR: = = ] count ] bi head-slice*
65 output-stream get '[ _ stream-write1 ] each ; inline
67 : (encode-base64) ( stream -- )
68 3 over stream-read dup length {
70 { 3 [ encode3 (encode-base64) ] }
71 [ encode-pad (encode-base64) ]
76 : encode-base64 ( -- )
77 input-stream get (encode-base64) ;
79 : encode-base64-lines ( -- )
80 0 column [ encode-base64 ] with-variable ;
84 : (decode-base64) ( stream -- )
85 4 "\n\r" pick read-ignoring dup length {
87 { 4 [ decode4 (decode-base64) ] }
93 : decode-base64 ( -- )
94 input-stream get (decode-base64) ;
96 : >base64 ( seq -- base64 )
97 binary [ binary [ encode-base64 ] with-byte-reader ] with-byte-writer ;
99 : base64> ( base64 -- seq )
100 binary [ binary [ decode-base64 ] with-byte-reader ] with-byte-writer ;
102 : >base64-lines ( seq -- base64 )
103 binary [ binary [ encode-base64-lines ] with-byte-reader ] with-byte-writer ;