1 ! Copyright (C) 2006, 2008 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 summary ;
17 : append-nums ( byte ch -- ch )
18 over [ 8 shift bitor ] [ 2drop replacement-char ] if ;
20 : double-be ( stream byte -- stream char )
21 over stream-read1 swap append-nums ;
23 : quad-be ( stream byte -- stream char )
24 double-be over stream-read1 [
25 dup -2 shift BIN: 110111 number= [
26 >r 2 shift r> BIN: 11 bitand bitor
27 over stream-read1 swap append-nums HEX: 10000 +
28 ] [ 2drop dup stream-read1 drop replacement-char ] if
31 : ignore ( stream -- stream char )
32 dup stream-read1 drop replacement-char ;
34 : begin-utf16be ( stream byte -- stream char )
35 dup -3 shift BIN: 11011 number= [
36 dup BIN: 00000100 bitand zero?
37 [ BIN: 11 bitand quad-be ]
41 M: utf16be decode-char
42 drop dup stream-read1 dup [ begin-utf16be ] when nip ;
46 : quad-le ( stream ch -- stream char )
47 over stream-read1 swap 10 shift bitor
48 over stream-read1 dup -2 shift BIN: 110111 = [
49 BIN: 11 bitand append-nums HEX: 10000 +
50 ] [ 2drop replacement-char ] if ;
52 : double-le ( stream byte1 byte2 -- stream char )
53 dup -3 shift BIN: 11011 = [
54 dup BIN: 100 bitand 0 number=
55 [ BIN: 11 bitand 8 shift bitor quad-le ]
56 [ 2drop replacement-char ] if
57 ] [ append-nums ] if ;
59 : begin-utf16le ( stream byte -- stream char )
60 over stream-read1 [ double-le ] [ drop replacement-char ] if* ;
62 M: utf16le decode-char
63 drop dup stream-read1 dup [ begin-utf16le ] when nip ;
65 ! UTF-16LE/BE encoding
67 : encode-first ( char -- byte1 byte2 )
69 dup -8 shift BIN: 11011000 bitor
72 : encode-second ( char -- byte3 byte4 )
73 BIN: 1111111111 bitand
74 dup -8 shift BIN: 11011100 bitor
75 swap BIN: 11111111 bitand ;
77 : stream-write2 ( stream char1 char2 -- )
78 rot [ stream-write1 ] curry bi@ ;
80 : char>utf16be ( stream char -- )
83 2dup encode-first stream-write2
84 encode-second stream-write2
85 ] [ h>b/b swap stream-write2 ] if ;
87 M: utf16be encode-char ( char stream encoding -- )
88 drop swap char>utf16be ;
90 : char>utf16le ( char stream -- )
93 2dup encode-first swap stream-write2
94 encode-second swap stream-write2
95 ] [ h>b/b stream-write2 ] if ;
97 M: utf16le encode-char ( char stream encoding -- )
98 drop swap char>utf16le ;
102 : bom-le B{ HEX: ff HEX: fe } ; inline
104 : bom-be B{ HEX: fe HEX: ff } ; inline
106 : start-utf16le? ( seq1 -- seq2 ? ) bom-le ?head ;
108 : start-utf16be? ( seq1 -- seq2 ? ) bom-be ?head ;
111 M: missing-bom summary drop "The BOM for a UTF-16 stream was missing" ;
113 : bom>le/be ( bom -- le/be )
114 dup bom-le sequence= [ drop utf16le ] [
115 bom-be sequence= [ utf16be ] [ missing-bom ] if
118 M: utf16 <decoder> ( stream utf16 -- decoder )
119 drop 2 over stream-read bom>le/be <decoder> ;
121 M: utf16 <encoder> ( stream utf16 -- encoder )
122 drop bom-le over stream-write utf16le <encoder> ;