1 ! Copyright (C) 2009 Doug Coleman.
2 ! See http://factorcode.org/license.txt for BSD license.
4 USING: alien.c-types alien.data byte-arrays combinators
5 combinators.smart endian kernel math math.ranges sequences
6 sequences.generalizations ;
8 USING: alien.c-types alien.data grouping kernel
9 math.bitwise namespaces sequences ;
13 SINGLETONS: big-endian little-endian ;
15 : compute-native-endianness ( -- class )
16 1 int <ref> char deref 0 = big-endian little-endian ? ; foldable
20 : slow-be> ( seq -- x ) 0 [ [ 8 shift ] dip + ] reduce ;
22 : slow-le> ( seq -- x ) 0 [ 8 * shift + ] reduce-index ;
24 ERROR: bad-length bytes n ;
26 : check-length ( bytes n -- bytes n )
27 2dup [ length ] dip > [ bad-length ] when ; inline
30 : be-range ( n -- range )
31 1 - 8 * 0 -8 <range> ; inline
33 : le-range ( n -- range )
34 1 - 8 * 0 swap 8 <range> ; inline
36 : reassemble-bytes ( range -- quot )
37 [ [ [ ] ] [ '[ _ shift ] ] if-zero ] map
38 '[ [ _ spread ] [ bitor ] reduce-outputs ] ; inline
40 MACRO: reassemble-be ( n -- quot ) be-range reassemble-bytes ;
42 MACRO: reassemble-le ( n -- quot ) le-range reassemble-bytes ;
45 :: n-be> ( bytes n -- x )
46 bytes n check-length drop n firstn-unsafe n reassemble-be ; inline
48 :: n-le> ( bytes n -- x )
49 bytes n check-length drop n firstn-unsafe n reassemble-le ; inline
51 ! HINTS: n-be> { byte-array object } ;
52 ! HINTS: n-le> { byte-array object } ;
55 ! { { fixnum fixnum } { bignum fixnum } }
60 ! { byte-array } set-specializer
63 : if-endian ( endian bytes-quot seq-quot -- )
65 compute-native-endianness =
66 [ dup byte-array? ] [ f ] if
70 big-endian [ uint16_t deref ] [ 2 n-be> ] if-endian ;
73 big-endian [ uint32_t deref ] [ 4 n-be> ] if-endian ;
76 big-endian [ uint64_t deref ] [ 8 n-be> ] if-endian ;
79 little-endian [ uint16_t deref ] [ 2 n-le> ] if-endian ;
82 little-endian [ uint32_t deref ] [ 4 n-le> ] if-endian ;
85 little-endian [ uint64_t deref ] [ 8 n-le> ] if-endian ;
107 : signed> ( x seq -- n )
108 length 8 * 2dup 1 - bit? [ 2^ - ] [ drop ] if ; inline
110 : slow-signed-le> ( bytes -- x ) [ le> ] [ signed> ] bi ;
112 : slow-signed-be> ( bytes -- x ) [ be> ] [ signed> ] bi ;
116 : signed-be> ( bytes -- x )
119 { 2 [ int16_t deref ] }
120 { 4 [ int32_t deref ] }
121 { 8 [ int64_t deref ] }
122 [ drop slow-signed-be> ]
124 ] [ slow-signed-be> ] if-endian ;
126 : signed-le> ( bytes -- x )
129 { 2 [ int16_t deref ] }
130 { 4 [ int32_t deref ] }
131 { 8 [ int64_t deref ] }
132 [ drop slow-signed-le> ]
134 ] [ slow-signed-le> ] if-endian ;
136 : nth-byte ( x n -- b ) -8 * shift 0xff bitand ; inline
140 : map-bytes ( x seq -- byte-array )
141 [ nth-byte ] with B{ } map-as ; inline
143 : >slow-be ( x n -- byte-array ) <iota> <reversed> map-bytes ;
145 : >slow-le ( x n -- byte-array ) <iota> map-bytes ;
149 : >le ( x n -- bytes )
150 compute-native-endianness little-endian = [
152 { 2 [ int16_t <ref> ] }
153 { 4 [ int32_t <ref> ] }
154 { 8 [ int64_t <ref> ] }
159 : >be ( x n -- bytes )
160 compute-native-endianness big-endian = [
162 { 2 [ int16_t <ref> ] }
163 { 4 [ int32_t <ref> ] }
164 { 8 [ int64_t <ref> ] }
169 SYMBOL: native-endianness
170 native-endianness [ compute-native-endianness ] initialize
172 HOOK: >native-endian native-endianness ( obj n -- bytes )
174 M: big-endian >native-endian >be ;
176 M: little-endian >native-endian >le ;
178 HOOK: unsigned-native-endian> native-endianness ( obj -- bytes )
180 M: big-endian unsigned-native-endian> be> ;
182 M: little-endian unsigned-native-endian> le> ;
185 endianness [ native-endianness get-global ] initialize
187 : signed-native-endian> ( obj n -- n' )
188 [ unsigned-native-endian> ] dip >signed ;
190 HOOK: >endian endianness ( obj n -- bytes )
192 M: big-endian >endian >be ;
194 M: little-endian >endian >le ;
196 HOOK: endian> endianness ( seq -- n )
198 M: big-endian endian> be> ;
200 M: little-endian endian> le> ;
202 HOOK: unsigned-endian> endianness ( obj -- bytes )
204 M: big-endian unsigned-endian> be> ;
206 M: little-endian unsigned-endian> le> ;
208 HOOK: signed-endian> endianness ( obj -- bytes )
210 M: big-endian signed-endian> signed-be> ;
212 M: little-endian signed-endian> signed-le> ;
214 : with-endianness ( endian quot -- )
215 [ endianness ] dip with-variable ; inline
217 : with-big-endian ( quot -- )
218 big-endian swap with-endianness ; inline
220 : with-little-endian ( quot -- )
221 little-endian swap with-endianness ; inline
223 : with-native-endian ( quot -- )
224 \ native-endianness get-global swap with-endianness ; inline
226 : seq>native-endianness ( seq n -- seq' )
227 native-endianness get-global dup endianness get = [
230 [ [ <groups> ] keep ] dip