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Annotation of embedaddon/libiconv/lib/utf16le.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:  * UTF-16LE
        !            23:  */
        !            24: 
        !            25: /* Specification: RFC 2781 */
        !            26: 
        !            27: static int
        !            28: utf16le_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] + (s[1] << 8);
        !            33:     if (wc >= 0xd800 && wc < 0xdc00) {
        !            34:       if (n >= 4) {
        !            35:         ucs4_t wc2 = s[2] + (s[3] << 8);
        !            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: utf16le_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;
        !            61:         r[1] = (unsigned char) (wc >> 8);
        !            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;
        !            71:         r[1] = (unsigned char) (wc1 >> 8);
        !            72:         r[2] = (unsigned char) wc2;
        !            73:         r[3] = (unsigned char) (wc2 >> 8);
        !            74:         return 4;
        !            75:       } else
        !            76:         return RET_TOOSMALL;
        !            77:     }
        !            78:   }
        !            79:   return RET_ILUNI;
        !            80: }