/* Access functions for GB2312 conversion.

   Copyright (C) 1998-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.

   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 _GB2312_H

#define _GB2312_H	1

#include <gconv.h>

#include <stdint.h>

#include <assert.h>

/* Conversion table.  */

extern const uint16_t __gb2312_to_ucs[];

static inline uint32_t

__attribute ((always_inline))

gb2312_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 || (ch - offset) > 0x77)

    return __UNKNOWN_10646_CHAR;

  if (avail < 2)

    return 0;

  ch2 = (*s)[1];

  if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)

    return __UNKNOWN_10646_CHAR;

  idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);

  if (idx > 0x1ff1)

    return __UNKNOWN_10646_CHAR;

  (*s) += 2;

  return __gb2312_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);

}

extern const char __gb2312_from_ucs4_tab1[][2];

extern const char __gb2312_from_ucs4_tab2[][2];

extern const char __gb2312_from_ucs4_tab3[][2];

extern const char __gb2312_from_ucs4_tab4[][2];

extern const char __gb2312_from_ucs4_tab5[][2];

extern const char __gb2312_from_ucs4_tab6[][2];

extern const char __gb2312_from_ucs4_tab7[][2];

extern const char __gb2312_from_ucs4_tab8[][2];

extern const char __gb2312_from_ucs4_tab9[][2];

static inline size_t

__attribute ((always_inline))

ucs4_to_gb2312 (uint32_t wch, unsigned char *s, size_t avail)

{

  unsigned int ch = (unsigned int) wch;

  char buf[2];

  const char *cp = buf;

  switch (ch)

    {

    case 0xa4 ... 0x101:

      cp = __gb2312_from_ucs4_tab1[ch - 0xa4];

      break;

    case 0x113:

      cp = "\x28\x25";

      break;

    case 0x11b:

      cp = "\x28\x27";

      break;

    case 0x12b:

      cp = "\x28\x29";

      break;

    case 0x14d:

      cp = "\x28\x2d";

      break;

    case 0x16b:

      cp = "\x28\x31";

      break;

    case 0x1ce:

      cp = "\x28\x23";

      break;

    case 0x1d0:

      cp = "\x28\x2b";

      break;

    case 0x1d2:

      cp = "\x28\x2f";

      break;

    case 0x1d4:

      cp = "\x28\x33";

      break;

    case 0x1d6:

      cp = "\x28\x35";

      break;

    case 0x1d8:

      cp = "\x28\x36";

      break;

    case 0x1da:

      cp = "\x28\x37";

      break;

    case 0x1dc:

      cp = "\x28\x38";

      break;

    case 0x2c7:

      cp = "\x21\x26";

      break;

    case 0x2c9:

      cp = "\x21\x25";

      break;

    case 0x391 ... 0x3c9:

      cp = __gb2312_from_ucs4_tab2[ch - 0x391];

      break;

    case 0x401 ... 0x451:

      cp = __gb2312_from_ucs4_tab3[ch - 0x401];

      break;

    case 0x2015 ... 0x203b:

      cp = __gb2312_from_ucs4_tab4[ch - 0x2015];

      break;

    case 0x2103 ... 0x22a5:

      cp = __gb2312_from_ucs4_tab5[ch - 0x2103];

      break;

    case 0x2312:

      cp = "\x21\x50";

      break;

    case 0x2460 ... 0x249b:

      cp = __gb2312_from_ucs4_tab6[ch - 0x2460];

      break;

    case 0x2500 ... 0x254b:

      buf[0] = '\x29';

      buf[1] = '\x24' + (ch % 256);

      break;

    case 0x25a0:

      cp = "\x21\x76";

      break;

    case 0x25a1:

      cp = "\x21\x75";

      break;

    case 0x25b2:

      cp = "\x21\x78";

      break;

    case 0x25b3:

      cp = "\x21\x77";

      break;

    case 0x25c6:

      cp = "\x21\x74";

      break;

    case 0x25c7:

      cp = "\x21\x73";

      break;

    case 0x25cb:

      cp = "\x21\x70";

      break;

    case 0x25ce:

      cp = "\x21\x72";

      break;

    case 0x25cf:

      cp = "\x21\x71";

      break;

    case 0x2605:

      cp = "\x21\x6f";

      break;

    case 0x2606:

      cp = "\x21\x6e";

      break;

    case 0x2640:

      cp = "\x21\x62";

      break;

    case 0x2642:

      cp = "\x21\x61";

      break;

    case 0x3000 ... 0x3129:

      cp = __gb2312_from_ucs4_tab7[ch - 0x3000];

      break;

    case 0x3220 ... 0x3229:

      buf[0] = '\x22';

      buf[1] = '\x65' + (ch - 0x3220);

      break;

    case 0x4e00 ... 0x9fa0:

      cp = __gb2312_from_ucs4_tab8[ch - 0x4e00];

      break;

    case 0xff01 ... 0xff5e:

      cp = __gb2312_from_ucs4_tab9[ch - 0xff01];

      break;

    case 0xffe0:

      cp = "\x21\x69";

      break;

    case 0xffe1:

      cp = "\x21\x6a";

      break;

    case 0xffe3:

      cp = "\x23\x7e";

      break;

    case 0xffe5:

      cp = "\x23\x24";

      break;

    default:

      return __UNKNOWN_10646_CHAR;

    }

  if (cp[0] == '\0')

    return __UNKNOWN_10646_CHAR;

  assert (cp[1] != '\0');

  if (avail < 2)

    return 0;

  s[0] = cp[0];

  s[1] = cp[1];

  return 2;

}

#endif	/* gb2312.h */