92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
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/*
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* Copyright (C) 1999-2001, 2008, 2011, 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-32
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*/
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/* Specification: Unicode 3.1 Standard Annex #19 */
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/* Here we accept FFFE0000/0000FEFF marks as endianness indicators
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everywhere in the stream, not just at the beginning. (This is contrary
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to what #19 D36c specifies, but it allows concatenation of byte
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sequences to work flawlessly, while disagreeing with #19 behaviour
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only for strings containing U+FEFF characters, which is quite rare.)
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The default is big-endian. */
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/* The state is 0 if big-endian, 1 if little-endian. */
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static int
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utf32_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
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{
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state_t state = conv->istate;
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int count = 0;
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for (; n >= 4 && count <= RET_COUNT_MAX && count <= INT_MAX-4;) {
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ucs4_t wc = (state
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? s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
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: (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3]);
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if (wc == 0x0000feff) {
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} else if (wc == 0xfffe0000u) {
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state ^= 1;
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} else {
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if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
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*pwc = wc;
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conv->istate = state;
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return count+4;
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} else {
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conv->istate = state;
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return RET_SHIFT_ILSEQ(count);
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}
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}
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s += 4; n -= 4; count += 4;
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}
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conv->istate = state;
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return RET_TOOFEW(count);
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}
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/* We output UTF-32 in big-endian order, with byte-order mark. */
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/* The state is 0 at the beginning, 1 after the BOM has been written. */
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static int
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utf32_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
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{
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if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
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int count = 0;
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if (!conv->ostate) {
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if (n >= 4) {
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r[0] = 0x00;
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r[1] = 0x00;
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r[2] = 0xFE;
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r[3] = 0xFF;
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r += 4; n -= 4; count += 4;
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} else
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return RET_TOOSMALL;
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}
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if (wc < 0x110000) {
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if (n >= 4) {
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r[0] = 0;
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r[1] = (unsigned char) (wc >> 16);
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r[2] = (unsigned char) (wc >> 8);
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r[3] = (unsigned char) wc;
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conv->ostate = 1;
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return count+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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