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69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
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/*
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* Copyright (C) 1999-2001, 2008 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 Library General Public
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* License as published by the Free Software Foundation; either version 2
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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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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* Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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* UCS-2
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*/
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/* Here we accept FFFE/FEFF marks as endianness indicators everywhere
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in the stream, not just at the beginning. 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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ucs2_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int 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 >= 2;) {
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ucs4_t wc = (state ? s[0] + (s[1] << 8) : (s[0] << 8) + s[1]);
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s += 2; n -= 2; count += 2;
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if (wc == 0xfeff) {
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} else if (wc == 0xfffe) {
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state ^= 1;
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} else if (wc >= 0xd800 && wc < 0xe000) {
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conv->istate = state;
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return RET_SHIFT_ILSEQ(count);
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} else {
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*pwc = wc;
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conv->istate = state;
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return count;
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}
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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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/* But we output UCS-2 in big-endian order, without byte-order mark. */
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/* RFC 2152 says:
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"ISO/IEC 10646-1:1993(E) specifies that when characters the UCS-2 form are
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serialized as octets, that the most significant octet appear first." */
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static int
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ucs2_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
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{
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if (wc < 0x10000 && wc != 0xfffe && !(wc >= 0xd800 && wc < 0xe000)) {
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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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} else
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return RET_ILUNI;
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}
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