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 } 54