thodg/libiconv/lib/utf16le.h

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• Hash : e54fc9c1
  Author :
  Date : 2018-09-17T18:28:56
  

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• lib/utf16le.h

• /*
   * Copyright (C) 1999-2001, 2008, 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 Library General Public
   * License as published by the Free Software Foundation; either version 2
   * 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
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public
   * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   * If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * UTF-16LE
   */
  
  /* Specification: RFC 2781 */
  
  static int
  utf16le_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  {
    int count = 0;
    if (n >= 2) {
      ucs4_t wc = s[0] + (s[1] << 8);
      if (wc >= 0xd800 && wc < 0xdc00) {
        if (n >= 4) {
          ucs4_t wc2 = s[2] + (s[3] << 8);
          if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
            goto ilseq;
          *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
          return count+4;
        }
      } else if (wc >= 0xdc00 && wc < 0xe000) {
        goto ilseq;
      } else {
        *pwc = wc;
        return count+2;
      }
    }
    return RET_TOOFEW(count);
  
  ilseq:
    return RET_SHIFT_ILSEQ(count);
  }
  
  static int
  utf16le_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    if (!(wc >= 0xd800 && wc < 0xe000)) {
      if (wc < 0x10000) {
        if (n >= 2) {
          r[0] = (unsigned char) wc;
          r[1] = (unsigned char) (wc >> 8);
          return 2;
        } else
          return RET_TOOSMALL;
      }
      else if (wc < 0x110000) {
        if (n >= 4) {
          ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
          ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
          r[0] = (unsigned char) wc1;
          r[1] = (unsigned char) (wc1 >> 8);
          r[2] = (unsigned char) wc2;
          r[3] = (unsigned char) (wc2 >> 8);
          return 4;
        } else
          return RET_TOOSMALL;
      }
    }
    return RET_ILUNI;
  }
  

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