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/* Access functions for JISX0208 conversion.
Copyright (C) 1997-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _JIS0208_H
#define _JIS0208_H 1
#include <gconv.h>
#include <stdint.h>
/* Struct for table with indices in UCS mapping table. */
struct jisx0208_ucs_idx
{
uint16_t start;
uint16_t end;
uint16_t idx;
};
/* Conversion table. */
extern const uint16_t __jis0208_to_ucs[];
#define JIS0208_LAT1_MIN 0xa2
#define JIS0208_LAT1_MAX 0xf7
extern const char __jisx0208_from_ucs4_lat1[JIS0208_LAT1_MAX + 1
- JIS0208_LAT1_MIN][2];
extern const char __jisx0208_from_ucs4_greek[0xc1][2];
extern const struct jisx0208_ucs_idx __jisx0208_from_ucs_idx[];
extern const char __jisx0208_from_ucs_tab[][2];
static inline uint32_t
__attribute ((always_inline))
jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
{
unsigned char ch = *(*s);
unsigned char ch2;
int idx;
if (ch < offset || (ch - offset) <= 0x20)
return __UNKNOWN_10646_CHAR;
if (avail < 2)
return 0;
ch2 = (*s)[1];
if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
return __UNKNOWN_10646_CHAR;
idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
if (idx >= 0x1e80)
return __UNKNOWN_10646_CHAR;
(*s) += 2;
return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
}
static inline size_t
__attribute ((always_inline))
ucs4_to_jisx0208 (uint32_t wch, unsigned char *s, size_t avail)
{
unsigned int ch = (unsigned int) wch;
const char *cp;
if (avail < 2)
return 0;
if (ch >= JIS0208_LAT1_MIN && ch <= JIS0208_LAT1_MAX)
cp = __jisx0208_from_ucs4_lat1[ch - JIS0208_LAT1_MIN];
else if (ch >= 0x391 && ch <= 0x451)
cp = __jisx0208_from_ucs4_greek[ch - 0x391];
else
{
const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx;
if (ch >= 0xffff)
return __UNKNOWN_10646_CHAR;
while (ch > rp->end)
++rp;
if (ch >= rp->start)
cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start];
else
return __UNKNOWN_10646_CHAR;
}
if (cp[0] == '\0')
return __UNKNOWN_10646_CHAR;
s[0] = cp[0];
s[1] = cp[1];
return 2;
}
#endif /* jis0208.h */
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