1 ! Copyright (C) 2008 Doug Coleman, Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: arrays combinators fry io io.binary io.encodings.binary
4 io.streams.byte-array kernel literals 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 ] [ suffix! ] 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
26 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
29 : alphabet-inverse ( alphabet -- seq )
30 dup supremum 1 + f <array> [
31 '[ swap _ set-nth ] each-index
34 : ch>base64 ( ch -- ch )
37 : base64>ch ( ch -- ch )
38 $[ alphabet alphabet-inverse 0 CHAR: = pick set-nth ] nth
39 [ malformed-base64 ] unless* ; inline
43 : write1-lines ( column/f ch stream -- column' )
44 [ stream-write1 ] keep swap [
46 '[ 76 = [ B{ CHAR: \r CHAR: \n } _ stream-write ] when ]
50 : write-lines ( str -- )
51 column output-stream get '[
52 swap [ _ write1-lines ] each
56 column output-stream get '[
57 swap be> { -18 -12 -6 0 } [
58 shift 0x3f bitand ch>base64 _ write1-lines
62 : encode-pad ( seq n -- )
63 [ 3 0 pad-tail binary [ encode3 ] with-byte-writer ]
64 [ 1 + ] bi* head-slice 4 CHAR: = pad-tail write-lines ; inline
67 [ 0 [ base64>ch swap 6 shift bitor ] reduce 3 >be ]
68 [ [ CHAR: = = ] count ] bi head-slice*
69 output-stream get '[ _ stream-write1 ] each ; inline
71 : (encode-base64) ( stream -- )
72 3 over stream-read dup length {
74 { 3 [ encode3 (encode-base64) ] }
75 [ encode-pad (encode-base64) ]
80 : encode-base64 ( -- )
81 input-stream get (encode-base64) ;
83 : encode-base64-lines ( -- )
84 0 column [ encode-base64 ] with-variable ;
88 : (decode-base64) ( stream -- )
89 4 "\n\r" pick read-ignoring dup length {
91 { 4 [ decode4 (decode-base64) ] }
97 : decode-base64 ( -- )
98 input-stream get (decode-base64) ;
100 : >base64 ( seq -- base64 )
101 binary [ binary [ encode-base64 ] with-byte-reader ] with-byte-writer ;
103 : base64> ( base64 -- seq )
104 binary [ binary [ decode-base64 ] with-byte-reader ] with-byte-writer ;
106 : >base64-lines ( seq -- base64 )
107 binary [ binary [ encode-base64-lines ] with-byte-reader ] with-byte-writer ;