! Copyright (C) 2009 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: alien.c-types namespaces io.binary fry
-kernel math ;
+kernel math grouping sequences ;
IN: endian
SINGLETONS: big-endian little-endian ;
-: native-endianness ( -- class )
+: compute-native-endianness ( -- class )
1 <int> *char 0 = big-endian little-endian ? ;
: >signed ( x n -- y )
2dup neg 1+ shift 1 = [ 2^ - ] [ drop ] if ;
-native-endianness \ native-endianness set-global
+SYMBOL: native-endianness
+native-endianness [ compute-native-endianness ] initialize
SYMBOL: endianness
+endianness [ native-endianness get-global ] initialize
-\ native-endianness get-global endianness set-global
-
-HOOK: >native-endian native-endianness ( obj n -- str )
+HOOK: >native-endian native-endianness ( obj n -- bytes )
M: big-endian >native-endian >be ;
M: little-endian >native-endian >le ;
-HOOK: unsigned-native-endian> native-endianness ( obj -- str )
+HOOK: unsigned-native-endian> native-endianness ( obj -- bytes )
M: big-endian unsigned-native-endian> be> ;
M: little-endian unsigned-native-endian> le> ;
-: signed-native-endian> ( obj n -- str )
+: signed-native-endian> ( obj n -- n' )
[ unsigned-native-endian> ] dip >signed ;
-HOOK: >endian endianness ( obj n -- str )
+HOOK: >endian endianness ( obj n -- bytes )
M: big-endian >endian >be ;
M: little-endian endian> le> ;
-HOOK: unsigned-endian> endianness ( obj -- str )
+HOOK: unsigned-endian> endianness ( obj -- bytes )
M: big-endian unsigned-endian> be> ;
M: little-endian unsigned-endian> le> ;
-: signed-endian> ( obj n -- str )
+: signed-endian> ( obj n -- bytes )
[ unsigned-endian> ] dip >signed ;
: with-endianness ( endian quot -- )
: with-native-endian ( quot -- )
\ native-endianness get-global swap with-endianness ; inline
+
+: seq>native-endianness ( seq n -- seq' )
+ native-endianness get-global dup endianness get = [
+ 2drop
+ ] [
+ [ [ <sliced-groups> ] keep ] dip
+ little-endian = [
+ '[ be> _ >le ] map
+ ] [
+ '[ le> _ >be ] map
+ ] if concat
+ ] if ; inline