80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/*
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* Copyright (C) 1999-2001, 2008, 2016 Free Software Foundation, Inc.
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* This file is part of the GNU LIBICONV Library.
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*
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* The GNU LIBICONV Library is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* The GNU LIBICONV Library is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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* UTF-16BE
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*/
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/* Specification: RFC 2781 */
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static int
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utf16be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
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{
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int count = 0;
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if (n >= 2) {
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ucs4_t wc = (s[0] << 8) + s[1];
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if (wc >= 0xd800 && wc < 0xdc00) {
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if (n >= 4) {
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ucs4_t wc2 = (s[2] << 8) + s[3];
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if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
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goto ilseq;
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*pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
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return count+4;
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}
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} else if (wc >= 0xdc00 && wc < 0xe000) {
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goto ilseq;
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} else {
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*pwc = wc;
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return count+2;
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}
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}
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return RET_TOOFEW(count);
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ilseq:
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return RET_SHIFT_ILSEQ(count);
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}
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static int
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utf16be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
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{
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if (!(wc >= 0xd800 && wc < 0xe000)) {
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if (wc < 0x10000) {
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if (n >= 2) {
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r[0] = (unsigned char) (wc >> 8);
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r[1] = (unsigned char) wc;
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return 2;
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} else
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return RET_TOOSMALL;
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}
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else if (wc < 0x110000) {
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if (n >= 4) {
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ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
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ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
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r[0] = (unsigned char) (wc1 >> 8);
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r[1] = (unsigned char) wc1;
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r[2] = (unsigned char) (wc2 >> 8);
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r[3] = (unsigned char) wc2;
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return 4;
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} else
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return RET_TOOSMALL;
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}
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}
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return RET_ILUNI;
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}
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