1 ! Copyright (C) 2009 Doug Coleman.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: alien.c-types alien.data grouping io.binary kernel
4 math.bitwise namespaces sequences ;
7 SINGLETONS: big-endian little-endian ;
9 : compute-native-endianness ( -- class )
10 1 int <ref> char deref 0 = big-endian little-endian ? ; foldable
12 SYMBOL: native-endianness
13 native-endianness [ compute-native-endianness ] initialize
16 endianness [ native-endianness get-global ] initialize
18 HOOK: >native-endian native-endianness ( obj n -- bytes )
20 M: big-endian >native-endian >be ;
22 M: little-endian >native-endian >le ;
24 HOOK: unsigned-native-endian> native-endianness ( obj -- bytes )
26 M: big-endian unsigned-native-endian> be> ;
28 M: little-endian unsigned-native-endian> le> ;
30 : signed-native-endian> ( obj n -- n' )
31 [ unsigned-native-endian> ] dip >signed ;
33 HOOK: >endian endianness ( obj n -- bytes )
35 M: big-endian >endian >be ;
37 M: little-endian >endian >le ;
39 HOOK: endian> endianness ( seq -- n )
41 M: big-endian endian> be> ;
43 M: little-endian endian> le> ;
45 HOOK: unsigned-endian> endianness ( obj -- bytes )
47 M: big-endian unsigned-endian> be> ;
49 M: little-endian unsigned-endian> le> ;
51 : signed-endian> ( obj n -- bytes )
52 [ unsigned-endian> ] dip >signed ;
54 : with-endianness ( endian quot -- )
55 [ endianness ] dip with-variable ; inline
57 : with-big-endian ( quot -- )
58 big-endian swap with-endianness ; inline
60 : with-little-endian ( quot -- )
61 little-endian swap with-endianness ; inline
63 : with-native-endian ( quot -- )
64 \ native-endianness get-global swap with-endianness ; inline
66 : seq>native-endianness ( seq n -- seq' )
67 native-endianness get-global dup endianness get = [
70 [ [ <groups> ] keep ] dip