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98 lines
2.9 KiB
98 lines
2.9 KiB
/* |
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* Copyright (C) 1999-2001, 2004, 2016 Free Software Foundation, Inc. |
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* This file is part of the GNU LIBICONV Library. |
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* |
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* The GNU LIBICONV Library is free software; you can redistribute it |
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* and/or modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* The GNU LIBICONV Library is distributed in the hope that it will be |
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public |
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB. |
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* If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/* |
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* UTF-8 |
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*/ |
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/* Specification: RFC 3629 */ |
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static int |
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utf8_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n) |
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{ |
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unsigned char c = s[0]; |
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if (c < 0x80) { |
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*pwc = c; |
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return 1; |
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} else if (c < 0xc2) { |
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return RET_ILSEQ; |
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} else if (c < 0xe0) { |
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if (n < 2) |
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return RET_TOOFEW(0); |
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if (!((s[1] ^ 0x80) < 0x40)) |
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return RET_ILSEQ; |
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*pwc = ((ucs4_t) (c & 0x1f) << 6) |
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| (ucs4_t) (s[1] ^ 0x80); |
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return 2; |
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} else if (c < 0xf0) { |
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if (n < 3) |
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return RET_TOOFEW(0); |
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if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 |
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&& (c >= 0xe1 || s[1] >= 0xa0) |
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&& (c != 0xed || s[1] < 0xa0))) |
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return RET_ILSEQ; |
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*pwc = ((ucs4_t) (c & 0x0f) << 12) |
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| ((ucs4_t) (s[1] ^ 0x80) << 6) |
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| (ucs4_t) (s[2] ^ 0x80); |
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return 3; |
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} else if (c < 0xf8 && sizeof(ucs4_t)*8 >= 32) { |
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if (n < 4) |
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return RET_TOOFEW(0); |
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if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 |
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&& (s[3] ^ 0x80) < 0x40 |
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&& (c >= 0xf1 || s[1] >= 0x90) |
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&& (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)))) |
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return RET_ILSEQ; |
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*pwc = ((ucs4_t) (c & 0x07) << 18) |
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| ((ucs4_t) (s[1] ^ 0x80) << 12) |
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| ((ucs4_t) (s[2] ^ 0x80) << 6) |
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| (ucs4_t) (s[3] ^ 0x80); |
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return 4; |
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} else |
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return RET_ILSEQ; |
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} |
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static int |
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utf8_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n) /* n == 0 is acceptable */ |
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{ |
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int count; |
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if (wc < 0x80) |
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count = 1; |
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else if (wc < 0x800) |
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count = 2; |
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else if (wc < 0x10000) { |
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if (wc < 0xd800 || wc >= 0xe000) |
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count = 3; |
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else |
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return RET_ILUNI; |
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} else if (wc < 0x110000) |
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count = 4; |
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else |
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return RET_ILUNI; |
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if (n < count) |
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return RET_TOOSMALL; |
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switch (count) { /* note: code falls through cases! */ |
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case 4: r[3] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x10000; |
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case 3: r[2] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x800; |
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case 2: r[1] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0xc0; |
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case 1: r[0] = wc; |
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} |
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return count; |
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}
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