1 /* 2 * Copyright (C) 1999-2001 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-16BE 23 */ 24 25 /* Specification: RFC 2781 */ 26 27 static int 28 utf16be_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] << 8) + s[1]; 33 if (wc >= 0xd800 && wc < 0xdc00) { 34 if (n >= 4) { 35 ucs4_t wc2 = (s[2] << 8) + s[3]; 36 if (!(wc2 >= 0xdc00 && wc2 < 0xe000)) 37 return RET_ILSEQ; 38 *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00); 39 return count+4; 40 } 41 } else if (wc >= 0xdc00 && wc < 0xe000) { 42 return RET_ILSEQ; 43 } else { 44 *pwc = wc; 45 return count+2; 46 } 47 } 48 return RET_TOOFEW(count); 49 } 50 51 static int 52 utf16be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) 53 { 54 if (!(wc >= 0xd800 && wc < 0xe000)) { 55 if (wc < 0x10000) { 56 if (n >= 2) { 57 r[0] = (unsigned char) (wc >> 8); 58 r[1] = (unsigned char) wc; 59 return 2; 60 } else 61 return RET_TOOSMALL; 62 } 63 else if (wc < 0x110000) { 64 if (n >= 4) { 65 ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10); 66 ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff); 67 r[0] = (unsigned char) (wc1 >> 8); 68 r[1] = (unsigned char) wc1; 69 r[2] = (unsigned char) (wc2 >> 8); 70 r[3] = (unsigned char) wc2; 71 return 4; 72 } else 73 return RET_TOOSMALL; 74 } 75 } 76 return RET_ILUNI; 77 } 78