128 lines
4 KiB
C
128 lines
4 KiB
C
/*
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* Copyright (C) 1999-2001, 2004 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, write to the Free Software Foundation, Inc., 51 Franklin Street,
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* Fifth Floor, Boston, MA 02110-1301, USA.
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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, int 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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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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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 if (c < 0xfc && sizeof(ucs4_t)*8 >= 32) {
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if (n < 5)
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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 && (s[4] ^ 0x80) < 0x40
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&& (c >= 0xf9 || s[1] >= 0x88)))
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return RET_ILSEQ;
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*pwc = ((ucs4_t) (c & 0x03) << 24)
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| ((ucs4_t) (s[1] ^ 0x80) << 18)
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| ((ucs4_t) (s[2] ^ 0x80) << 12)
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| ((ucs4_t) (s[3] ^ 0x80) << 6)
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| (ucs4_t) (s[4] ^ 0x80);
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return 5;
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} else if (c < 0xfe && sizeof(ucs4_t)*8 >= 32) {
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if (n < 6)
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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 && (s[4] ^ 0x80) < 0x40
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&& (s[5] ^ 0x80) < 0x40
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&& (c >= 0xfd || s[1] >= 0x84)))
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return RET_ILSEQ;
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*pwc = ((ucs4_t) (c & 0x01) << 30)
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| ((ucs4_t) (s[1] ^ 0x80) << 24)
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| ((ucs4_t) (s[2] ^ 0x80) << 18)
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| ((ucs4_t) (s[3] ^ 0x80) << 12)
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| ((ucs4_t) (s[4] ^ 0x80) << 6)
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| (ucs4_t) (s[5] ^ 0x80);
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return 6;
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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, int 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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count = 3;
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else if (wc < 0x200000)
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count = 4;
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else if (wc < 0x4000000)
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count = 5;
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else if (wc <= 0x7fffffff)
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count = 6;
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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 6: r[5] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x4000000;
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case 5: r[4] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x200000;
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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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