mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 22:30:07 +00:00
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/* Access functions for JISX0212 conversion.
|
|
Copyright (C) 1997-2024 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 _JIS0212_H
|
|
#define _JIS0212_H 1
|
|
|
|
#include <assert.h>
|
|
#include <gconv.h>
|
|
#include <stdint.h>
|
|
|
|
|
|
/* Struct for table with indices in mapping table. */
|
|
struct jisx0212_idx
|
|
{
|
|
uint16_t start;
|
|
uint16_t end;
|
|
uint16_t idx;
|
|
};
|
|
|
|
/* Conversion table. */
|
|
extern const struct jisx0212_idx __jisx0212_to_ucs_idx[];
|
|
extern const uint16_t __jisx0212_to_ucs[];
|
|
|
|
extern const struct jisx0212_idx __jisx0212_from_ucs_idx[];
|
|
extern const char __jisx0212_from_ucs[][2];
|
|
|
|
|
|
static inline uint32_t
|
|
__attribute ((always_inline))
|
|
jisx0212_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
|
|
{
|
|
const struct jisx0212_idx *rp = __jisx0212_to_ucs_idx;
|
|
unsigned char ch = *(*s);
|
|
unsigned char ch2;
|
|
uint32_t wch = 0;
|
|
int idx;
|
|
|
|
if (ch < offset || (ch - offset) < 0x22 || (ch - offset) > 0x6d)
|
|
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 - offset - 0x21) * 94 + (ch2 - offset - 0x21);
|
|
|
|
while (idx > rp->end)
|
|
++rp;
|
|
if (idx >= rp->start)
|
|
wch = __jisx0212_to_ucs[rp->idx + idx - rp->start];
|
|
|
|
if (wch != L'\0')
|
|
(*s) += 2;
|
|
else
|
|
wch = __UNKNOWN_10646_CHAR;
|
|
|
|
return wch;
|
|
}
|
|
|
|
|
|
static inline size_t
|
|
__attribute ((always_inline))
|
|
ucs4_to_jisx0212 (uint32_t wch, unsigned char *s, size_t avail)
|
|
{
|
|
const struct jisx0212_idx *rp = __jisx0212_from_ucs_idx;
|
|
unsigned int ch = (unsigned int) wch;
|
|
const char *cp;
|
|
|
|
if (ch >= 0xffff)
|
|
return __UNKNOWN_10646_CHAR;
|
|
while (ch > rp->end)
|
|
++rp;
|
|
if (ch >= rp->start)
|
|
cp = __jisx0212_from_ucs[rp->idx + ch - rp->start];
|
|
else
|
|
return __UNKNOWN_10646_CHAR;
|
|
|
|
if (cp[0] == '\0')
|
|
return __UNKNOWN_10646_CHAR;
|
|
|
|
s[0] = cp[0];
|
|
assert (cp[1] != '\0');
|
|
if (avail < 2)
|
|
return 0;
|
|
|
|
s[1] = cp[1];
|
|
return 2;
|
|
}
|
|
|
|
#endif /* jis0212.h */
|