/* Access functions for JISX0212 conversion.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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

   <http://www.gnu.org/licenses/>.  */

#ifndef _JIS0212_H

#define _JIS0212_H	1

#include <assert.h>

#include <gconv.h>

#include <stdint.h>

/* Struct for table with indeces 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 */