kc3-lang/libiconv/lib/ucs4.h

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• Author : Bruno Haible
  Date : 2021-06-06 11:51:12
  Hash : 91f96be0
  Message : Change the license of the library from LGPL 2.0 to LGPL 2.1.

• lib/ucs4.h

• /*
   * Copyright (C) 1999-2001, 2008, 2011, 2016 Free Software Foundation, Inc.
   * This file is part of the GNU LIBICONV Library.
   *
   * The GNU LIBICONV Library is free software; you can redistribute it
   * and/or modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either version 2.1
   * of the License, or (at your option) any later version.
   *
   * The GNU LIBICONV Library is distributed in the hope that it will be
   * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   * If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * UCS-4
   */
  
  /* Here we accept FFFE0000/0000FEFF marks as endianness indicators everywhere
     in the stream, not just at the beginning. The default is big-endian. */
  /* The state is 0 if big-endian, 1 if little-endian. */
  static int
  ucs4_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  {
    state_t state = conv->istate;
    int count = 0;
    for (; n >= 4 && count <= RET_COUNT_MAX && count <= INT_MAX-4;) {
      ucs4_t wc = (state
                    ? s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
                    : (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3]);
      if (wc == 0x0000feff) {
      } else if (wc == 0xfffe0000u) {
        state ^= 1;
      } else if (wc <= 0x7fffffff) {
        *pwc = wc;
        conv->istate = state;
        return count+4;
      } else {
        conv->istate = state;
        return RET_SHIFT_ILSEQ(count);
      }
      s += 4; n -= 4; count += 4;
    }
    conv->istate = state;
    return RET_TOOFEW(count);
  }
  
  /* But we output UCS-4 in big-endian order, without byte-order mark. */
  static int
  ucs4_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    if (wc <= 0x7fffffff) {
      if (n >= 4) {
        r[0] = (unsigned char) (wc >> 24);
        r[1] = (unsigned char) (wc >> 16);
        r[2] = (unsigned char) (wc >> 8);
        r[3] = (unsigned char) wc;
        return 4;
      } else
        return RET_TOOSMALL;
    } else
      return RET_ILUNI;
  }