22 lines
612 B
Factor
22 lines
612 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 ;
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IN: checksums.common
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SYMBOL: bytes-read
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: calculate-pad-length ( length -- pad-length )
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dup 56 < 55 119 ? swap - ;
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: pad-last-block ( str big-endian? length -- str )
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[
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rot %
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HEX: 80 ,
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dup HEX: 3f bitand calculate-pad-length 0 <string> %
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3 shift 8 rot [ >be ] [ >le ] if %
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] "" make 64 group ;
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: update-old-new ( old new -- )
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[ get >r get r> ] 2keep >r >r w+ dup r> set r> set ; inline
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