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Annotation of embedaddon/libiconv/lib/utf8.h, revision 1.1.1.1

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: }