mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-12-23 13:31:49 +00:00
129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
/*
|
|
* Copyright (C) 1999-2001, 2004 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, write to the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
/*
|
|
* UTF-8
|
|
*/
|
|
|
|
/* Specification: RFC 3629 */
|
|
|
|
static int
|
|
utf8_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
|
|
{
|
|
unsigned char c = s[0];
|
|
|
|
if (c < 0x80) {
|
|
*pwc = c;
|
|
return 1;
|
|
} else if (c < 0xc2) {
|
|
return RET_ILSEQ;
|
|
} else if (c < 0xe0) {
|
|
if (n < 2)
|
|
return RET_TOOFEW(0);
|
|
if (!((s[1] ^ 0x80) < 0x40))
|
|
return RET_ILSEQ;
|
|
*pwc = ((ucs4_t) (c & 0x1f) << 6)
|
|
| (ucs4_t) (s[1] ^ 0x80);
|
|
return 2;
|
|
} else if (c < 0xf0) {
|
|
if (n < 3)
|
|
return RET_TOOFEW(0);
|
|
if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
|
|
&& (c >= 0xe1 || s[1] >= 0xa0)))
|
|
return RET_ILSEQ;
|
|
*pwc = ((ucs4_t) (c & 0x0f) << 12)
|
|
| ((ucs4_t) (s[1] ^ 0x80) << 6)
|
|
| (ucs4_t) (s[2] ^ 0x80);
|
|
return 3;
|
|
} else if (c < 0xf8 && sizeof(ucs4_t)*8 >= 32) {
|
|
if (n < 4)
|
|
return RET_TOOFEW(0);
|
|
if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
|
|
&& (s[3] ^ 0x80) < 0x40
|
|
&& (c >= 0xf1 || s[1] >= 0x90)))
|
|
return RET_ILSEQ;
|
|
*pwc = ((ucs4_t) (c & 0x07) << 18)
|
|
| ((ucs4_t) (s[1] ^ 0x80) << 12)
|
|
| ((ucs4_t) (s[2] ^ 0x80) << 6)
|
|
| (ucs4_t) (s[3] ^ 0x80);
|
|
return 4;
|
|
} else if (c < 0xfc && sizeof(ucs4_t)*8 >= 32) {
|
|
if (n < 5)
|
|
return RET_TOOFEW(0);
|
|
if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
|
|
&& (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
|
|
&& (c >= 0xf9 || s[1] >= 0x88)))
|
|
return RET_ILSEQ;
|
|
*pwc = ((ucs4_t) (c & 0x03) << 24)
|
|
| ((ucs4_t) (s[1] ^ 0x80) << 18)
|
|
| ((ucs4_t) (s[2] ^ 0x80) << 12)
|
|
| ((ucs4_t) (s[3] ^ 0x80) << 6)
|
|
| (ucs4_t) (s[4] ^ 0x80);
|
|
return 5;
|
|
} else if (c < 0xfe && sizeof(ucs4_t)*8 >= 32) {
|
|
if (n < 6)
|
|
return RET_TOOFEW(0);
|
|
if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
|
|
&& (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
|
|
&& (s[5] ^ 0x80) < 0x40
|
|
&& (c >= 0xfd || s[1] >= 0x84)))
|
|
return RET_ILSEQ;
|
|
*pwc = ((ucs4_t) (c & 0x01) << 30)
|
|
| ((ucs4_t) (s[1] ^ 0x80) << 24)
|
|
| ((ucs4_t) (s[2] ^ 0x80) << 18)
|
|
| ((ucs4_t) (s[3] ^ 0x80) << 12)
|
|
| ((ucs4_t) (s[4] ^ 0x80) << 6)
|
|
| (ucs4_t) (s[5] ^ 0x80);
|
|
return 6;
|
|
} else
|
|
return RET_ILSEQ;
|
|
}
|
|
|
|
static int
|
|
utf8_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) /* n == 0 is acceptable */
|
|
{
|
|
int count;
|
|
if (wc < 0x80)
|
|
count = 1;
|
|
else if (wc < 0x800)
|
|
count = 2;
|
|
else if (wc < 0x10000)
|
|
count = 3;
|
|
else if (wc < 0x200000)
|
|
count = 4;
|
|
else if (wc < 0x4000000)
|
|
count = 5;
|
|
else if (wc <= 0x7fffffff)
|
|
count = 6;
|
|
else
|
|
return RET_ILUNI;
|
|
if (n < count)
|
|
return RET_TOOSMALL;
|
|
switch (count) { /* note: code falls through cases! */
|
|
case 6: r[5] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x4000000;
|
|
case 5: r[4] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x200000;
|
|
case 4: r[3] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x10000;
|
|
case 3: r[2] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x800;
|
|
case 2: r[1] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0xc0;
|
|
case 1: r[0] = wc;
|
|
}
|
|
return count;
|
|
}
|