1/*
2 * Copyright (C) 1999-2000 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-SWAPPED = UCS-4-INTERNAL with inverted endianness
23 */
24
25static int
26ucs4swapped_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
27{
28  /* This function assumes that 'unsigned int' has exactly 32 bits. */
29  if (sizeof(unsigned int) != 4) abort();
30
31  if (n >= 4) {
32    unsigned int x = *(const unsigned int *)s;
33    x = (x >> 24) | ((x >> 8) & 0xff00) | ((x & 0xff00) << 8) | (x << 24);
34    *pwc = x;
35    return 4;
36  }
37  return RET_TOOFEW(0);
38}
39
40static int
41ucs4swapped_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
42{
43  /* This function assumes that 'unsigned int' has exactly 32 bits. */
44  if (sizeof(unsigned int) != 4) abort();
45
46  if (n >= 4) {
47    unsigned int x = wc;
48    x = (x >> 24) | ((x >> 8) & 0xff00) | ((x & 0xff00) << 8) | (x << 24);
49    *(unsigned int *)r = x;
50    return 4;
51  } else
52    return RET_TOOSMALL;
53}
54