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base85: use literals to compute the inverse array instead of hardcoding.

db4
John Benediktsson 2015-07-15 18:20:35 -07:00
parent 027a71d98e
commit 5b50bf43f3
1 changed files with 7 additions and 11 deletions
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18
extra/base85/base85.factor
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@ -1,7 +1,7 @@
! Copyright (C) 2013 John Benediktsson.
! See http://factorcode.org/license.txt for BSD license.
USING: base64 base64.private combinators fry io io.binary
io.encodings.binary io.streams.byte-array kernel math
io.encodings.binary io.streams.byte-array kernel literals math
namespaces sequences ;
IN: base85
@ -9,19 +9,15 @@ ERROR: malformed-base85 ;
<PRIVATE
: ch>base85 ( ch -- ch )
CONSTANT: alphabet
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#$%&()*+-;<=>?@^_`{|}~\";"
nth ; inline
: ch>base85 ( ch -- ch )
alphabet nth ; inline
: base85>ch ( ch -- ch )
{
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 62 f 63 64 65 66 f 67 68 69 70 f 71 f f 0 1 2
3 4 5 6 7 8 9 f 72 73 74 75 76 77 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
f f f 78 79 80 36 37 38 39 40 41 42 43 44 45 46 47 48 49
50 51 52 53 54 55 56 57 58 59 60 61 81 82 83 84
} nth [ malformed-base85 ] unless* ; inline
$[ alphabet alphabet-inverse ] nth
[ malformed-base85 ] unless* ; inline
: encode4 ( seq -- )
column output-stream get '[