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1 office 1 /*
2 * Copyright (C) 1999-2001, 2008 Free Software Foundation, Inc.
3 * This file is part of the GNU LIBICONV Library.
4 *
5 * The GNU LIBICONV Library is free software; you can redistribute it
6 * and/or modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * The GNU LIBICONV Library is distributed in the hope that it will be
11 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
17 * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
18 * Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20  
21 /*
22 * UTF-16BE
23 */
24  
25 /* Specification: RFC 2781 */
26  
27 static int
28 utf16be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
29 {
30 int count = 0;
31 if (n >= 2) {
32 ucs4_t wc = (s[0] << 8) + s[1];
33 if (wc >= 0xd800 && wc < 0xdc00) {
34 if (n >= 4) {
35 ucs4_t wc2 = (s[2] << 8) + s[3];
36 if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
37 goto ilseq;
38 *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
39 return count+4;
40 }
41 } else if (wc >= 0xdc00 && wc < 0xe000) {
42 goto ilseq;
43 } else {
44 *pwc = wc;
45 return count+2;
46 }
47 }
48 return RET_TOOFEW(count);
49  
50 ilseq:
51 return RET_SHIFT_ILSEQ(count);
52 }
53  
54 static int
55 utf16be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
56 {
57 if (!(wc >= 0xd800 && wc < 0xe000)) {
58 if (wc < 0x10000) {
59 if (n >= 2) {
60 r[0] = (unsigned char) (wc >> 8);
61 r[1] = (unsigned char) wc;
62 return 2;
63 } else
64 return RET_TOOSMALL;
65 }
66 else if (wc < 0x110000) {
67 if (n >= 4) {
68 ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
69 ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
70 r[0] = (unsigned char) (wc1 >> 8);
71 r[1] = (unsigned char) wc1;
72 r[2] = (unsigned char) (wc2 >> 8);
73 r[3] = (unsigned char) wc2;
74 return 4;
75 } else
76 return RET_TOOSMALL;
77 }
78 }
79 return RET_ILUNI;
80 }