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Annotation of embedaddon/libiconv/lib/ucs4swapped.h, revision 1.1.1.1

1.1       misho       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: }