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 * UTF-16LE 23 */ 24 25/* Specification: RFC 2781 */ 26 27static int 28utf16le_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n) 29{ 30 int count = 0; 31 if (n >= 2) { 32 ucs4_t wc = s[0] + (s[1] << 8); 33 if (wc >= 0xd800 && wc < 0xdc00) { 34 if (n >= 4) { 35 ucs4_t wc2 = s[2] + (s[3] << 8); 36 if (!(wc2 >= 0xdc00 && wc2 < 0xe000)) 37 goto ilseq; 38 *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00); 39 return count+4; 40 } 41 } else if (wc >= 0xdc00 && wc < 0xe000) { 42 goto ilseq; 43 } else { 44 *pwc = wc; 45 return count+2; 46 } 47 } 48 return RET_TOOFEW(count); 49 50ilseq: 51 return RET_SHIFT_ILSEQ(count); 52} 53 54static int 55utf16le_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) 56{ 57 if (!(wc >= 0xd800 && wc < 0xe000)) { 58 if (wc < 0x10000) { 59 if (n >= 2) { 60 r[0] = (unsigned char) wc; 61 r[1] = (unsigned char) (wc >> 8); 62 return 2; 63 } else 64 return RET_TOOSMALL; 65 } 66 else if (wc < 0x110000) { 67 if (n >= 4) { 68 ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10); 69 ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff); 70 r[0] = (unsigned char) wc1; 71 r[1] = (unsigned char) (wc1 >> 8); 72 r[2] = (unsigned char) wc2; 73 r[3] = (unsigned char) (wc2 >> 8); 74 return 4; 75 } else 76 return RET_TOOSMALL; 77 } 78 } 79 return RET_ILUNI; 80} 81