| /* |
| * Copyright (C) 1999-2001, 2008, 2016 Free Software Foundation, Inc. |
| * This file is part of the GNU LIBICONV Library. |
| * |
| * The GNU LIBICONV Library is free software; you can redistribute it |
| * and/or modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either version 2.1 |
| * of the License, or (at your option) any later version. |
| * |
| * The GNU LIBICONV Library is distributed in the hope that it will be |
| * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with the GNU LIBICONV Library; see the file COPYING.LIB. |
| * If not, see <https://www.gnu.org/licenses/>. |
| */ |
| |
| /* |
| * UTF-16LE |
| */ |
| |
| /* Specification: RFC 2781 */ |
| |
| static int |
| utf16le_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n) |
| { |
| int count = 0; |
| if (n >= 2) { |
| ucs4_t wc = s[0] + (s[1] << 8); |
| if (wc >= 0xd800 && wc < 0xdc00) { |
| if (n >= 4) { |
| ucs4_t wc2 = s[2] + (s[3] << 8); |
| if (!(wc2 >= 0xdc00 && wc2 < 0xe000)) |
| goto ilseq; |
| *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00); |
| return count+4; |
| } |
| } else if (wc >= 0xdc00 && wc < 0xe000) { |
| goto ilseq; |
| } else { |
| *pwc = wc; |
| return count+2; |
| } |
| } |
| return RET_TOOFEW(count); |
| |
| ilseq: |
| return RET_SHIFT_ILSEQ(count); |
| } |
| |
| static int |
| utf16le_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n) |
| { |
| if (!(wc >= 0xd800 && wc < 0xe000)) { |
| if (wc < 0x10000) { |
| if (n >= 2) { |
| r[0] = (unsigned char) wc; |
| r[1] = (unsigned char) (wc >> 8); |
| return 2; |
| } else |
| return RET_TOOSMALL; |
| } |
| else if (wc < 0x110000) { |
| if (n >= 4) { |
| ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10); |
| ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff); |
| r[0] = (unsigned char) wc1; |
| r[1] = (unsigned char) (wc1 >> 8); |
| r[2] = (unsigned char) wc2; |
| r[3] = (unsigned char) (wc2 >> 8); |
| return 4; |
| } else |
| return RET_TOOSMALL; |
| } |
| } |
| return RET_ILUNI; |
| } |