109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
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/* Access functions for JISX0208 conversion.
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Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _JIS0208_H
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#define _JIS0208_H 1
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#include <gconv.h>
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#include <stdint.h>
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/* Conversion table. */
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extern const uint16_t __jis0208_to_ucs[];
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extern const char __jisx0208_from_ucs4_lat1[256][2];
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extern const char __jisx0208_from_ucs4_greek[0xc1][2];
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extern const struct jisx0208_ucs_idx __jisx0208_from_ucs_idx[];
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extern const char __jisx0208_from_ucs_tab[][2];
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/* Struct for table with indeces in UCS mapping table. */
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struct jisx0208_ucs_idx
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{
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uint16_t start;
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uint16_t end;
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uint16_t idx;
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};
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static inline uint32_t
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jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
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{
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unsigned char ch = *(*s);
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unsigned char ch2;
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int idx;
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if (ch < offset || (ch - offset) <= 0x20)
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return __UNKNOWN_10646_CHAR;
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if (avail < 2)
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return 0;
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ch2 = (*s)[1];
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if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
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return __UNKNOWN_10646_CHAR;
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idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
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if (idx >= 0x1e80)
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return __UNKNOWN_10646_CHAR;
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(*s) += 2;
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return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
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}
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static inline size_t
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ucs4_to_jisx0208 (uint32_t wch, char *s, size_t avail)
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{
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unsigned int ch = (unsigned int) wch;
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const char *cp;
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if (avail < 2)
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return 0;
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if (ch < 0x100)
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cp = __jisx0208_from_ucs4_lat1[ch];
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else if (ch >= 0x391 && ch <= 0x451)
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cp = __jisx0208_from_ucs4_greek[ch - 0x391];
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else
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{
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const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx;
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if (ch >= 0xffff)
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return __UNKNOWN_10646_CHAR;
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while (ch > rp->end)
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++rp;
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if (ch >= rp->start)
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cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start];
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else
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return __UNKNOWN_10646_CHAR;
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}
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if (cp[0] == '\0')
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return __UNKNOWN_10646_CHAR;
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s[0] = cp[0];
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s[1] = cp[1];
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return 2;
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}
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#endif /* jis0208.h */
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