34 lines
885 B
Factor
34 lines
885 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 ) dup length iota 0 [ 8 * shift + ] 2reduce ;
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: be> ( seq -- x ) 0 [ [ 8 shift ] dip + ] reduce ;
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: mask-byte ( x -- y ) 0xff 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 ) iota [ nth-byte ] with B{ } map-as ;
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: >be ( x n -- byte-array ) >le reverse! ;
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: d>w/w ( d -- w1 w2 )
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[ 0xffffffff bitand ]
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[ -32 shift 0xffffffff bitand ] bi ;
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: w>h/h ( w -- h1 h2 )
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[ 0xffff bitand ]
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[ -16 shift 0xffff 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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: signed-le> ( bytes -- x )
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[ le> ] [ length 8 * 1 - 2^ 1 - ] bi
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2dup > [ bitnot bitor ] [ drop ] if ;
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: signed-be> ( bytes -- x )
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<reversed> signed-le> ;
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