27 lines
713 B
Factor
27 lines
713 B
Factor
! Copyright (C) 2003, 2007 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel math sequences ;
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IN: io.binary
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: le> ( seq -- x ) B{ } like byte-array>bignum >integer ;
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: be> ( seq -- x ) <reversed> le> ;
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: mask-byte ( x -- y ) HEX: ff bitand ; inline
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: nth-byte ( x n -- b ) -8 * shift mask-byte ; inline
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: >le ( x n -- byte-array ) [ nth-byte ] with B{ } map-as ;
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: >be ( x n -- byte-array ) >le dup reverse-here ;
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: d>w/w ( d -- w1 w2 )
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[ HEX: ffffffff bitand ]
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[ -32 shift HEX: ffffffff bitand ] bi ;
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: w>h/h ( w -- h1 h2 )
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[ HEX: ffff bitand ]
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[ -16 shift HEX: ffff bitand ] bi ;
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: h>b/b ( h -- b1 b2 )
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[ mask-byte ]
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[ -8 shift mask-byte ] bi ;
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