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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 * UCS-4
23 */
24  
25 /* Here we accept FFFE0000/0000FEFF marks as endianness indicators everywhere
26 in the stream, not just at the beginning. The default is big-endian. */
27 /* The state is 0 if big-endian, 1 if little-endian. */
28 static int
29 ucs4_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
30 {
31 state_t state = conv->istate;
32 int count = 0;
33 for (; n >= 4;) {
34 ucs4_t wc = (state
35 ? s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
36 : (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3]);
37 s += 4; n -= 4; count += 4;
38 if (wc == 0x0000feff) {
39 } else if (wc == 0xfffe0000u) {
40 state ^= 1;
41 } else if (wc <= 0x7fffffff) {
42 *pwc = wc;
43 conv->istate = state;
44 return count;
45 } else {
46 conv->istate = state;
47 return RET_SHIFT_ILSEQ(count);
48 }
49 }
50 conv->istate = state;
51 return RET_TOOFEW(count);
52 }
53  
54 /* But we output UCS-4 in big-endian order, without byte-order mark. */
55 static int
56 ucs4_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
57 {
58 if (wc <= 0x7fffffff) {
59 if (n >= 4) {
60 r[0] = (unsigned char) (wc >> 24);
61 r[1] = (unsigned char) (wc >> 16);
62 r[2] = (unsigned char) (wc >> 8);
63 r[3] = (unsigned char) wc;
64 return 4;
65 } else
66 return RET_TOOSMALL;
67 } else
68 return RET_ILUNI;
69 }