0,0 → 1,128 |
/* |
* 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; |
} |