Annotation of embedaddon/libiconv/lib/ucs2.h, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 1999-2001, 2008 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: * UCS-2
! 23: */
! 24:
! 25: /* Here we accept FFFE/FEFF marks as endianness indicators everywhere
! 26: in the stream, not just at the beginning. The default is big-endian. */
! 27: /* The state is 0 if big-endian, 1 if little-endian. */
! 28: static int
! 29: ucs2_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
! 30: {
! 31: state_t state = conv->istate;
! 32: int count = 0;
! 33: for (; n >= 2;) {
! 34: ucs4_t wc = (state ? s[0] + (s[1] << 8) : (s[0] << 8) + s[1]);
! 35: s += 2; n -= 2; count += 2;
! 36: if (wc == 0xfeff) {
! 37: } else if (wc == 0xfffe) {
! 38: state ^= 1;
! 39: } else if (wc >= 0xd800 && wc < 0xe000) {
! 40: conv->istate = state;
! 41: return RET_SHIFT_ILSEQ(count);
! 42: } else {
! 43: *pwc = wc;
! 44: conv->istate = state;
! 45: return count;
! 46: }
! 47: }
! 48: conv->istate = state;
! 49: return RET_TOOFEW(count);
! 50: }
! 51:
! 52: /* But we output UCS-2 in big-endian order, without byte-order mark. */
! 53: /* RFC 2152 says:
! 54: "ISO/IEC 10646-1:1993(E) specifies that when characters the UCS-2 form are
! 55: serialized as octets, that the most significant octet appear first." */
! 56: static int
! 57: ucs2_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
! 58: {
! 59: if (wc < 0x10000 && wc != 0xfffe && !(wc >= 0xd800 && wc < 0xe000)) {
! 60: if (n >= 2) {
! 61: r[0] = (unsigned char) (wc >> 8);
! 62: r[1] = (unsigned char) wc;
! 63: return 2;
! 64: } else
! 65: return RET_TOOSMALL;
! 66: } else
! 67: return RET_ILUNI;
! 68: }
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