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Annotation of embedaddon/libiconv/lib/utf16be.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:  * 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: }