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Annotation of embedaddon/libiconv/lib/utf16le.h, revision 1.1.1.2

1.1       misho       1: /*
1.1.1.2 ! misho       2:  * Copyright (C) 1999-2001, 2008, 2016 Free Software Foundation, Inc.
1.1       misho       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.
1.1.1.2 ! misho      17:  * If not, see <https://www.gnu.org/licenses/>.
1.1       misho      18:  */
                     19: 
                     20: /*
                     21:  * UTF-16LE
                     22:  */
                     23: 
                     24: /* Specification: RFC 2781 */
                     25: 
                     26: static int
1.1.1.2 ! misho      27: utf16le_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
1.1       misho      28: {
                     29:   int count = 0;
                     30:   if (n >= 2) {
                     31:     ucs4_t wc = s[0] + (s[1] << 8);
                     32:     if (wc >= 0xd800 && wc < 0xdc00) {
                     33:       if (n >= 4) {
                     34:         ucs4_t wc2 = s[2] + (s[3] << 8);
                     35:         if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
                     36:           goto ilseq;
                     37:         *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
                     38:         return count+4;
                     39:       }
                     40:     } else if (wc >= 0xdc00 && wc < 0xe000) {
                     41:       goto ilseq;
                     42:     } else {
                     43:       *pwc = wc;
                     44:       return count+2;
                     45:     }
                     46:   }
                     47:   return RET_TOOFEW(count);
                     48: 
                     49: ilseq:
                     50:   return RET_SHIFT_ILSEQ(count);
                     51: }
                     52: 
                     53: static int
1.1.1.2 ! misho      54: utf16le_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
1.1       misho      55: {
                     56:   if (!(wc >= 0xd800 && wc < 0xe000)) {
                     57:     if (wc < 0x10000) {
                     58:       if (n >= 2) {
                     59:         r[0] = (unsigned char) wc;
                     60:         r[1] = (unsigned char) (wc >> 8);
                     61:         return 2;
                     62:       } else
                     63:         return RET_TOOSMALL;
                     64:     }
                     65:     else if (wc < 0x110000) {
                     66:       if (n >= 4) {
                     67:         ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
                     68:         ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
                     69:         r[0] = (unsigned char) wc1;
                     70:         r[1] = (unsigned char) (wc1 >> 8);
                     71:         r[2] = (unsigned char) wc2;
                     72:         r[3] = (unsigned char) (wc2 >> 8);
                     73:         return 4;
                     74:       } else
                     75:         return RET_TOOSMALL;
                     76:     }
                     77:   }
                     78:   return RET_ILUNI;
                     79: }