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Annotation of embedaddon/libiconv/lib/ucs2.h, revision 1.1.1.1

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: }