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libiconv

    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:  * UTF-16BE
   23:  */
   24: 
   25: /* Specification: RFC 2781 */
   26: 
   27: static int
   28: utf16be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   29: {
   30:   int count = 0;
   31:   if (n >= 2) {
   32:     ucs4_t wc = (s[0] << 8) + s[1];
   33:     if (wc >= 0xd800 && wc < 0xdc00) {
   34:       if (n >= 4) {
   35:         ucs4_t wc2 = (s[2] << 8) + s[3];
   36:         if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
   37:           goto ilseq;
   38:         *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
   39:         return count+4;
   40:       }
   41:     } else if (wc >= 0xdc00 && wc < 0xe000) {
   42:       goto ilseq;
   43:     } else {
   44:       *pwc = wc;
   45:       return count+2;
   46:     }
   47:   }
   48:   return RET_TOOFEW(count);
   49: 
   50: ilseq:
   51:   return RET_SHIFT_ILSEQ(count);
   52: }
   53: 
   54: static int
   55: utf16be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   56: {
   57:   if (!(wc >= 0xd800 && wc < 0xe000)) {
   58:     if (wc < 0x10000) {
   59:       if (n >= 2) {
   60:         r[0] = (unsigned char) (wc >> 8);
   61:         r[1] = (unsigned char) wc;
   62:         return 2;
   63:       } else
   64:         return RET_TOOSMALL;
   65:     }
   66:     else if (wc < 0x110000) {
   67:       if (n >= 4) {
   68:         ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
   69:         ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
   70:         r[0] = (unsigned char) (wc1 >> 8);
   71:         r[1] = (unsigned char) wc1;
   72:         r[2] = (unsigned char) (wc2 >> 8);
   73:         r[3] = (unsigned char) wc2;
   74:         return 4;
   75:       } else
   76:         return RET_TOOSMALL;
   77:     }
   78:   }
   79:   return RET_ILUNI;
   80: }