utf16le.h
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/*
* 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 <http://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;
}