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Annotation of embedaddon/libiconv/lib/ucs4.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:  * UCS-4
                     22:  */
                     23: 
                     24: /* Here we accept FFFE0000/0000FEFF marks as endianness indicators everywhere
                     25:    in the stream, not just at the beginning. The default is big-endian. */
                     26: /* The state is 0 if big-endian, 1 if little-endian. */
                     27: static int
1.1.1.2 ! misho      28: ucs4_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
1.1       misho      29: {
                     30:   state_t state = conv->istate;
                     31:   int count = 0;
1.1.1.2 ! misho      32:   for (; n >= 4 && count <= RET_COUNT_MAX && count <= INT_MAX-4;) {
1.1       misho      33:     ucs4_t wc = (state
                     34:                   ? s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
                     35:                   : (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3]);
                     36:     if (wc == 0x0000feff) {
                     37:     } else if (wc == 0xfffe0000u) {
                     38:       state ^= 1;
                     39:     } else if (wc <= 0x7fffffff) {
                     40:       *pwc = wc;
                     41:       conv->istate = state;
1.1.1.2 ! misho      42:       return count+4;
1.1       misho      43:     } else {
                     44:       conv->istate = state;
                     45:       return RET_SHIFT_ILSEQ(count);
                     46:     }
1.1.1.2 ! misho      47:     s += 4; n -= 4; count += 4;
1.1       misho      48:   }
                     49:   conv->istate = state;
                     50:   return RET_TOOFEW(count);
                     51: }
                     52: 
                     53: /* But we output UCS-4 in big-endian order, without byte-order mark. */
                     54: static int
1.1.1.2 ! misho      55: ucs4_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
1.1       misho      56: {
                     57:   if (wc <= 0x7fffffff) {
                     58:     if (n >= 4) {
                     59:       r[0] = (unsigned char) (wc >> 24);
                     60:       r[1] = (unsigned char) (wc >> 16);
                     61:       r[2] = (unsigned char) (wc >> 8);
                     62:       r[3] = (unsigned char) wc;
                     63:       return 4;
                     64:     } else
                     65:       return RET_TOOSMALL;
                     66:   } else
                     67:     return RET_ILUNI;
                     68: }