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Annotation of embedaddon/libiconv/lib/utf32.h, revision 1.1.1.2

1.1       misho       1: /*
1.1.1.2 ! misho       2:  * Copyright (C) 1999-2001, 2008, 2011, 2016 Free Software Foundation, Inc.
1.1       misho       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.
1.1.1.2 ! misho      17:  * If not, see <https://www.gnu.org/licenses/>.
1.1       misho      18:  */
                     19: 
                     20: /*
                     21:  * UTF-32
                     22:  */
                     23: 
                     24: /* Specification: Unicode 3.1 Standard Annex #19 */
                     25: 
                     26: /* Here we accept FFFE0000/0000FEFF marks as endianness indicators
                     27:    everywhere in the stream, not just at the beginning. (This is contrary
                     28:    to what #19 D36c specifies, but it allows concatenation of byte
                     29:    sequences to work flawlessly, while disagreeing with #19 behaviour
                     30:    only for strings containing U+FEFF characters, which is quite rare.)
                     31:    The default is big-endian. */
                     32: /* The state is 0 if big-endian, 1 if little-endian. */
                     33: static int
1.1.1.2 ! misho      34: utf32_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
1.1       misho      35: {
                     36:   state_t state = conv->istate;
                     37:   int count = 0;
1.1.1.2 ! misho      38:   for (; n >= 4 && count <= RET_COUNT_MAX && count <= INT_MAX-4;) {
1.1       misho      39:     ucs4_t wc = (state
                     40:                   ? s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
                     41:                   : (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3]);
                     42:     if (wc == 0x0000feff) {
                     43:     } else if (wc == 0xfffe0000u) {
                     44:       state ^= 1;
                     45:     } else {
                     46:       if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
                     47:         *pwc = wc;
                     48:         conv->istate = state;
1.1.1.2 ! misho      49:         return count+4;
1.1       misho      50:       } else {
                     51:         conv->istate = state;
                     52:         return RET_SHIFT_ILSEQ(count);
                     53:       }
                     54:     }
1.1.1.2 ! misho      55:     s += 4; n -= 4; count += 4;
1.1       misho      56:   }
                     57:   conv->istate = state;
                     58:   return RET_TOOFEW(count);
                     59: }
                     60: 
                     61: /* We output UTF-32 in big-endian order, with byte-order mark. */
                     62: /* The state is 0 at the beginning, 1 after the BOM has been written. */
                     63: static int
1.1.1.2 ! misho      64: utf32_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
1.1       misho      65: {
                     66:   if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
                     67:     int count = 0;
                     68:     if (!conv->ostate) {
                     69:       if (n >= 4) {
                     70:         r[0] = 0x00;
                     71:         r[1] = 0x00;
                     72:         r[2] = 0xFE;
                     73:         r[3] = 0xFF;
                     74:         r += 4; n -= 4; count += 4;
                     75:       } else
                     76:         return RET_TOOSMALL;
                     77:     }
                     78:     if (wc < 0x110000) {
                     79:       if (n >= 4) {
                     80:         r[0] = 0;
                     81:         r[1] = (unsigned char) (wc >> 16);
                     82:         r[2] = (unsigned char) (wc >> 8);
                     83:         r[3] = (unsigned char) wc;
                     84:         conv->ostate = 1;
                     85:         return count+4;
                     86:       } else
                     87:         return RET_TOOSMALL;
                     88:     }
                     89:   }
                     90:   return RET_ILUNI;
                     91: }