/* * 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; }