21 lines
619 B
Factor
21 lines
619 B
Factor
! Copyright (C) 2006, 2008 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel math math.bitwise strings io.binary namespaces
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make grouping byte-arrays ;
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IN: checksums.common
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SYMBOL: bytes-read
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: calculate-pad-length ( length -- length' )
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[ 56 < 55 119 ? ] keep - ;
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: pad-last-block ( str big-endian? length -- str )
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[
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[ % ] 2dip HEX: 80 ,
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[ HEX: 3f bitand calculate-pad-length <byte-array> % ]
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[ 3 shift 8 rot [ >be ] [ >le ] if % ] bi
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] B{ } make 64 group ;
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: update-old-new ( old new -- )
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[ [ get ] bi@ w+ dup ] 2keep [ set ] bi@ ; inline
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