release/src/router/libiconv/lib/ucs4swapped.h

   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
  25 static int
  26 ucs4swapped_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
  40 static int
  41 ucs4swapped_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 }