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libiconv

    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:  * UCS-4
   23:  */
   24: 
   25: /* Here we accept FFFE0000/0000FEFF marks as endianness indicators everywhere
   26:    in the stream, not just at the beginning. The default is big-endian. */
   27: /* The state is 0 if big-endian, 1 if little-endian. */
   28: static int
   29: ucs4_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   30: {
   31:   state_t state = conv->istate;
   32:   int count = 0;
   33:   for (; n >= 4;) {
   34:     ucs4_t wc = (state
   35:                   ? s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
   36:                   : (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3]);
   37:     s += 4; n -= 4; count += 4;
   38:     if (wc == 0x0000feff) {
   39:     } else if (wc == 0xfffe0000u) {
   40:       state ^= 1;
   41:     } else if (wc <= 0x7fffffff) {
   42:       *pwc = wc;
   43:       conv->istate = state;
   44:       return count;
   45:     } else {
   46:       conv->istate = state;
   47:       return RET_SHIFT_ILSEQ(count);
   48:     }
   49:   }
   50:   conv->istate = state;
   51:   return RET_TOOFEW(count);
   52: }
   53: 
   54: /* But we output UCS-4 in big-endian order, without byte-order mark. */
   55: static int
   56: ucs4_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   57: {
   58:   if (wc <= 0x7fffffff) {
   59:     if (n >= 4) {
   60:       r[0] = (unsigned char) (wc >> 24);
   61:       r[1] = (unsigned char) (wc >> 16);
   62:       r[2] = (unsigned char) (wc >> 8);
   63:       r[3] = (unsigned char) wc;
   64:       return 4;
   65:     } else
   66:       return RET_TOOSMALL;
   67:   } else
   68:     return RET_ILUNI;
   69: }