94 lines
2.1 KiB
Factor
94 lines
2.1 KiB
Factor
! Copyright (C) 2013 John Benediktsson
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! See http://factorcode.org/license.txt for BSD license
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USING: io io.streams.string kernel locals make math math.bitwise
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math.order namespaces sequences ;
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IN: uu
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<PRIVATE
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ERROR: bad-length seq ;
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: check-length ( seq -- seq )
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dup length 45 > [ bad-length ] when ; inline
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:: binary>ascii ( seq -- seq' )
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0 :> char!
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0 :> bits!
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seq check-length [
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dup length char: \s + ,
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[ dup empty? bits zero? and ] [
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char 8 shift char!
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bits 8 + bits!
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dup empty? [
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unclip-slice char bitor char!
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] unless
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[ bits 6 >= ] [
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bits 6 -
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[ char swap neg shift 0x3f bitand char: \s + , ]
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[ bits! ] bi
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] while
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] until drop
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] "" make ;
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ERROR: illegal-character ch ;
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: check-illegal-character ( ch -- ch )
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dup char: \s dup 64 + between? [ illegal-character ] unless ;
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:: ascii>binary ( seq -- seq' )
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0 :> char!
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0 :> bits!
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seq unclip-slice char: \s - :> len!
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[
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[ dup empty? not len 0 > and ] [
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dup empty? [ 0 ] [ unclip-slice ] if
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dup "\r\n\0" member? [
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drop 0
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] [
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check-illegal-character
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char: \s -
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] if
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char 6 shift bitor char!
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bits 6 + bits!
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bits 8 >= [
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bits 8 -
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[ char swap neg shift 0xff bitand , ]
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[ on-bits char bitand char! ]
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[ bits! ] tri
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len 1 - len!
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] when
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] while drop
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] "" make ;
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PRIVATE>
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: uu-encode ( -- )
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"begin" print
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input-stream get [ binary>ascii print ] 45 (each-stream-block)
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"end" print ;
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: string>uu ( seq -- seq' )
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[ [ uu-encode ] with-string-writer ] with-string-reader ;
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: uu-decode ( -- )
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[ [ "begin" head? ] [ not ] bi or ] [ readln ] do until
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[
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dup [ "end" head? ] [ not ] bi or
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[ drop t ] [ ascii>binary write f ] if
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] [ readln ] do until ;
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: uu>string ( seq -- seq )
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[ [ uu-decode ] with-string-writer ] with-string-reader ;
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