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Annotation of embedaddon/libiconv/lib/utf32.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-32
        !            23:  */
        !            24: 
        !            25: /* Specification: Unicode 3.1 Standard Annex #19 */
        !            26: 
        !            27: /* Here we accept FFFE0000/0000FEFF marks as endianness indicators
        !            28:    everywhere in the stream, not just at the beginning. (This is contrary
        !            29:    to what #19 D36c specifies, but it allows concatenation of byte
        !            30:    sequences to work flawlessly, while disagreeing with #19 behaviour
        !            31:    only for strings containing U+FEFF characters, which is quite rare.)
        !            32:    The default is big-endian. */
        !            33: /* The state is 0 if big-endian, 1 if little-endian. */
        !            34: static int
        !            35: utf32_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
        !            36: {
        !            37:   state_t state = conv->istate;
        !            38:   int count = 0;
        !            39:   for (; n >= 4;) {
        !            40:     ucs4_t wc = (state
        !            41:                   ? s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
        !            42:                   : (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3]);
        !            43:     count += 4;
        !            44:     if (wc == 0x0000feff) {
        !            45:     } else if (wc == 0xfffe0000u) {
        !            46:       state ^= 1;
        !            47:     } else {
        !            48:       if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
        !            49:         *pwc = wc;
        !            50:         conv->istate = state;
        !            51:         return count;
        !            52:       } else {
        !            53:         conv->istate = state;
        !            54:         return RET_SHIFT_ILSEQ(count);
        !            55:       }
        !            56:     }
        !            57:     s += 4; n -= 4;
        !            58:   }
        !            59:   conv->istate = state;
        !            60:   return RET_TOOFEW(count);
        !            61: }
        !            62: 
        !            63: /* We output UTF-32 in big-endian order, with byte-order mark. */
        !            64: /* The state is 0 at the beginning, 1 after the BOM has been written. */
        !            65: static int
        !            66: utf32_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
        !            67: {
        !            68:   if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
        !            69:     int count = 0;
        !            70:     if (!conv->ostate) {
        !            71:       if (n >= 4) {
        !            72:         r[0] = 0x00;
        !            73:         r[1] = 0x00;
        !            74:         r[2] = 0xFE;
        !            75:         r[3] = 0xFF;
        !            76:         r += 4; n -= 4; count += 4;
        !            77:       } else
        !            78:         return RET_TOOSMALL;
        !            79:     }
        !            80:     if (wc < 0x110000) {
        !            81:       if (n >= 4) {
        !            82:         r[0] = 0;
        !            83:         r[1] = (unsigned char) (wc >> 16);
        !            84:         r[2] = (unsigned char) (wc >> 8);
        !            85:         r[3] = (unsigned char) wc;
        !            86:         conv->ostate = 1;
        !            87:         return count+4;
        !            88:       } else
        !            89:         return RET_TOOSMALL;
        !            90:     }
        !            91:   }
        !            92:   return RET_ILUNI;
        !            93: }