1 ! Copyright (C) 2006, 2009 Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: math kernel sequences sbufs vectors namespaces io.binary
4 io.encodings combinators splitting io byte-arrays io.encodings.iana ;
9 utf16be "UTF-16BE" register-encoding
13 utf16le "UTF-16LE" register-encoding
17 utf16 "UTF-16" register-encoding
25 : append-nums ( byte ch -- ch )
26 over [ 8 shift bitor ] [ 2drop replacement-char ] if ;
28 : double-be ( stream byte -- stream char )
29 over stream-read1 swap append-nums ;
31 : quad-be ( stream byte -- stream char )
32 double-be over stream-read1 [
33 dup -2 shift BIN: 110111 number= [
34 [ 2 shift ] dip BIN: 11 bitand bitor
35 over stream-read1 swap append-nums HEX: 10000 +
36 ] [ 2drop dup stream-read1 drop replacement-char ] if
39 : ignore ( stream -- stream char )
40 dup stream-read1 drop replacement-char ;
42 : begin-utf16be ( stream byte -- stream char )
43 dup -3 shift BIN: 11011 number= [
44 dup BIN: 00000100 bitand zero?
45 [ BIN: 11 bitand quad-be ]
49 M: utf16be decode-char
50 drop dup stream-read1 dup [ begin-utf16be ] when nip ;
54 : quad-le ( stream ch -- stream char )
55 over stream-read1 swap 10 shift bitor
56 over stream-read1 dup -2 shift BIN: 110111 = [
57 BIN: 11 bitand append-nums HEX: 10000 +
58 ] [ 2drop replacement-char ] if ;
60 : double-le ( stream byte1 byte2 -- stream char )
61 dup -3 shift BIN: 11011 = [
62 dup BIN: 100 bitand 0 number=
63 [ BIN: 11 bitand 8 shift bitor quad-le ]
64 [ 2drop replacement-char ] if
65 ] [ append-nums ] if ;
67 : begin-utf16le ( stream byte -- stream char )
68 over stream-read1 [ double-le ] [ drop replacement-char ] if* ;
70 M: utf16le decode-char
71 drop dup stream-read1 dup [ begin-utf16le ] when nip ;
73 ! UTF-16LE/BE encoding
75 : encode-first ( char -- byte1 byte2 )
77 dup -8 shift BIN: 11011000 bitor
80 : encode-second ( char -- byte3 byte4 )
81 BIN: 1111111111 bitand
82 dup -8 shift BIN: 11011100 bitor
83 swap BIN: 11111111 bitand ;
85 : stream-write2 ( stream char1 char2 -- )
86 rot [ stream-write1 ] curry bi@ ;
88 : char>utf16be ( stream char -- )
91 2dup encode-first stream-write2
92 encode-second stream-write2
93 ] [ h>b/b swap stream-write2 ] if ;
95 M: utf16be encode-char ( char stream encoding -- )
96 drop swap char>utf16be ;
98 : char>utf16le ( char stream -- )
101 2dup encode-first swap stream-write2
102 encode-second swap stream-write2
103 ] [ h>b/b stream-write2 ] if ;
105 M: utf16le encode-char ( char stream encoding -- )
106 drop swap char>utf16le ;
110 CONSTANT: bom-le B{ HEX: ff HEX: fe }
112 CONSTANT: bom-be B{ HEX: fe HEX: ff }
114 : bom>le/be ( bom -- le/be )
115 dup bom-le sequence= [ drop utf16le ] [
116 bom-be sequence= [ utf16be ] [ missing-bom ] if
119 M: utf16 <decoder> ( stream utf16 -- decoder )
120 drop 2 over stream-read bom>le/be <decoder> ;
122 M: utf16 <encoder> ( stream utf16 -- encoder )
123 drop bom-le over stream-write utf16le <encoder> ;