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Annotation of embedaddon/libiconv/lib/utf8.h, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 1999-2001, 2004 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-8
        !            23:  */
        !            24: 
        !            25: /* Specification: RFC 3629 */
        !            26: 
        !            27: static int
        !            28: utf8_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
        !            29: {
        !            30:   unsigned char c = s[0];
        !            31: 
        !            32:   if (c < 0x80) {
        !            33:     *pwc = c;
        !            34:     return 1;
        !            35:   } else if (c < 0xc2) {
        !            36:     return RET_ILSEQ;
        !            37:   } else if (c < 0xe0) {
        !            38:     if (n < 2)
        !            39:       return RET_TOOFEW(0);
        !            40:     if (!((s[1] ^ 0x80) < 0x40))
        !            41:       return RET_ILSEQ;
        !            42:     *pwc = ((ucs4_t) (c & 0x1f) << 6)
        !            43:            | (ucs4_t) (s[1] ^ 0x80);
        !            44:     return 2;
        !            45:   } else if (c < 0xf0) {
        !            46:     if (n < 3)
        !            47:       return RET_TOOFEW(0);
        !            48:     if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
        !            49:           && (c >= 0xe1 || s[1] >= 0xa0)))
        !            50:       return RET_ILSEQ;
        !            51:     *pwc = ((ucs4_t) (c & 0x0f) << 12)
        !            52:            | ((ucs4_t) (s[1] ^ 0x80) << 6)
        !            53:            | (ucs4_t) (s[2] ^ 0x80);
        !            54:     return 3;
        !            55:   } else if (c < 0xf8 && sizeof(ucs4_t)*8 >= 32) {
        !            56:     if (n < 4)
        !            57:       return RET_TOOFEW(0);
        !            58:     if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
        !            59:           && (s[3] ^ 0x80) < 0x40
        !            60:           && (c >= 0xf1 || s[1] >= 0x90)))
        !            61:       return RET_ILSEQ;
        !            62:     *pwc = ((ucs4_t) (c & 0x07) << 18)
        !            63:            | ((ucs4_t) (s[1] ^ 0x80) << 12)
        !            64:            | ((ucs4_t) (s[2] ^ 0x80) << 6)
        !            65:            | (ucs4_t) (s[3] ^ 0x80);
        !            66:     return 4;
        !            67:   } else if (c < 0xfc && sizeof(ucs4_t)*8 >= 32) {
        !            68:     if (n < 5)
        !            69:       return RET_TOOFEW(0);
        !            70:     if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
        !            71:           && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
        !            72:           && (c >= 0xf9 || s[1] >= 0x88)))
        !            73:       return RET_ILSEQ;
        !            74:     *pwc = ((ucs4_t) (c & 0x03) << 24)
        !            75:            | ((ucs4_t) (s[1] ^ 0x80) << 18)
        !            76:            | ((ucs4_t) (s[2] ^ 0x80) << 12)
        !            77:            | ((ucs4_t) (s[3] ^ 0x80) << 6)
        !            78:            | (ucs4_t) (s[4] ^ 0x80);
        !            79:     return 5;
        !            80:   } else if (c < 0xfe && sizeof(ucs4_t)*8 >= 32) {
        !            81:     if (n < 6)
        !            82:       return RET_TOOFEW(0);
        !            83:     if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
        !            84:           && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
        !            85:           && (s[5] ^ 0x80) < 0x40
        !            86:           && (c >= 0xfd || s[1] >= 0x84)))
        !            87:       return RET_ILSEQ;
        !            88:     *pwc = ((ucs4_t) (c & 0x01) << 30)
        !            89:            | ((ucs4_t) (s[1] ^ 0x80) << 24)
        !            90:            | ((ucs4_t) (s[2] ^ 0x80) << 18)
        !            91:            | ((ucs4_t) (s[3] ^ 0x80) << 12)
        !            92:            | ((ucs4_t) (s[4] ^ 0x80) << 6)
        !            93:            | (ucs4_t) (s[5] ^ 0x80);
        !            94:     return 6;
        !            95:   } else
        !            96:     return RET_ILSEQ;
        !            97: }
        !            98: 
        !            99: static int
        !           100: utf8_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) /* n == 0 is acceptable */
        !           101: {
        !           102:   int count;
        !           103:   if (wc < 0x80)
        !           104:     count = 1;
        !           105:   else if (wc < 0x800)
        !           106:     count = 2;
        !           107:   else if (wc < 0x10000)
        !           108:     count = 3;
        !           109:   else if (wc < 0x200000)
        !           110:     count = 4;
        !           111:   else if (wc < 0x4000000)
        !           112:     count = 5;
        !           113:   else if (wc <= 0x7fffffff)
        !           114:     count = 6;
        !           115:   else
        !           116:     return RET_ILUNI;
        !           117:   if (n < count)
        !           118:     return RET_TOOSMALL;
        !           119:   switch (count) { /* note: code falls through cases! */
        !           120:     case 6: r[5] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x4000000;
        !           121:     case 5: r[4] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x200000;
        !           122:     case 4: r[3] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x10000;
        !           123:     case 3: r[2] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x800;
        !           124:     case 2: r[1] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0xc0;
        !           125:     case 1: r[0] = wc;
        !           126:   }
        !           127:   return count;
        !           128: }