/* Access functions for CNS 11643 handling.

   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/>.  */

#include <stdint.h>

/* Table for CNS 11643, plane 1 to UCS4 conversion.  */

extern const uint16_t __cns11643l1_to_ucs4_tab[];

/* Table for CNS 11643, plane 2 to UCS4 conversion.  */

extern const uint16_t __cns11643l2_to_ucs4_tab[];

/* Table for CNS 11643, plane 3 to UCS4 conversion.  */

extern const uint32_t __cns11643l3_to_ucs4_tab[];

/* Table for CNS 11643, plane 4 to UCS4 conversion.  */

extern const uint32_t __cns11643l4_to_ucs4_tab[];

/* Table for CNS 11643, plane 5 to UCS4 conversion.  */

extern const uint32_t __cns11643l5_to_ucs4_tab[];

/* Table for CNS 11643, plane 6 to UCS4 conversion.  */

extern const uint32_t __cns11643l6_to_ucs4_tab[];

/* Table for CNS 11643, plane 7 to UCS4 conversion.  */

extern const uint32_t __cns11643l7_to_ucs4_tab[];

/* Table for CNS 11643, plane 15 (old) to UCS4 conversion.  */

extern const uint32_t __cns11643l15_to_ucs4_tab[];

static inline uint32_t

__attribute ((always_inline))

cns11643_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)

{

  unsigned char ch = *(*s);

  unsigned char ch2;

  unsigned char ch3;

  uint32_t result;

  int idx;

  if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x30)

    return __UNKNOWN_10646_CHAR;

  if (avail < 3)

    return 0;

  ch2 = (*s)[1];

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

    return __UNKNOWN_10646_CHAR;

  ch3 = (*s)[2];

  if ((ch3 - offset) <= 0x20 || (ch3 - offset) >= 0x7f)

    return __UNKNOWN_10646_CHAR;

  idx = (ch2 - 0x21 - offset) * 94 + (ch3 - 0x21 - offset);

  switch (ch - 0x20 - offset)

    {

    case 1:

      if (idx > 0x21f2)

	return __UNKNOWN_10646_CHAR;

      result = __cns11643l1_to_ucs4_tab[idx];

      break;

    case 2:

      if (idx > 0x1de1)

	return __UNKNOWN_10646_CHAR;

      result = __cns11643l2_to_ucs4_tab[idx];

      break;

    case 3:

      if (idx > 0x19bd)

	return __UNKNOWN_10646_CHAR;

      result = __cns11643l3_to_ucs4_tab[idx];

      break;

    case 4:

      if (idx > 0x1c81)

	return __UNKNOWN_10646_CHAR;

      result = __cns11643l4_to_ucs4_tab[idx];

      break;

    case 5:

      if (idx > 0x219a)

	return __UNKNOWN_10646_CHAR;

      result = __cns11643l5_to_ucs4_tab[idx];

      break;

    case 6:

      if (idx > 0x18f3)

	return __UNKNOWN_10646_CHAR;

      result = __cns11643l6_to_ucs4_tab[idx];

      break;

    case 7:

      if (idx > 0x198a)

	return __UNKNOWN_10646_CHAR;

      result = __cns11643l7_to_ucs4_tab[idx];

      break;

    case 15:

      if (idx > 0x1c00)

	return __UNKNOWN_10646_CHAR;

      result = __cns11643l15_to_ucs4_tab[idx];

      break;

    default:

      return __UNKNOWN_10646_CHAR;

    }

  if (result != L'\0')

    (*s) += 3;

  else

    result = __UNKNOWN_10646_CHAR;

  return result;

}

/* Tables for the UCS4 -> CNS conversion.  */

extern const char __cns11643l1_from_ucs4_tab1[][2];

extern const char __cns11643l1_from_ucs4_tab2[][2];

extern const char __cns11643l1_from_ucs4_tab3[][2];

extern const char __cns11643l1_from_ucs4_tab4[][2];

extern const char __cns11643l1_from_ucs4_tab5[][2];

extern const char __cns11643l1_from_ucs4_tab6[][2];

extern const char __cns11643l1_from_ucs4_tab7[][2];

extern const char __cns11643l1_from_ucs4_tab8[][2];

extern const char __cns11643l1_from_ucs4_tab9[][2];

extern const char __cns11643l1_from_ucs4_tab10[][2];

extern const char __cns11643l1_from_ucs4_tab11[][2];

extern const char __cns11643l1_from_ucs4_tab12[][2];

extern const char __cns11643l1_from_ucs4_tab13[][2];

extern const char __cns11643l1_from_ucs4_tab14[][2];

extern const char __cns11643_from_ucs4p0_tab[][3];

extern const char __cns11643_from_ucs4p2_tab[][3];

extern const char __cns11643_from_ucs4p2c_tab[][3];

static inline size_t

__attribute ((always_inline))

ucs4_to_cns11643 (uint32_t wch, unsigned char *s, size_t avail)

{

  unsigned int ch = (unsigned int) wch;

  char buf[2];

  const char *cp = buf;

  size_t needed = 2;

  switch (ch)

    {

    case 0xa7 ... 0xf7:

      cp = __cns11643l1_from_ucs4_tab1[ch - 0xa7];

      break;

    case 0x2c7 ... 0x2d9:

      cp = __cns11643l1_from_ucs4_tab2[ch - 0x2c7];

      break;

    case 0x391 ... 0x3c9:

      cp = __cns11643l1_from_ucs4_tab3[ch - 0x391];

      break;

    case 0x2013 ... 0x203e:

      cp = __cns11643l1_from_ucs4_tab4[ch - 0x2013];

      break;

    case 0x2103:

      cp = "\x22\x6a";

      break;

    case 0x2105:

      cp = "\x22\x22";

      break;

    case 0x2109:

      cp = "\x22\x6b";

      break;

    case 0x2160 ... 0x2169:

      buf[0] = '\x24';

      buf[1] = '\x2b' + (ch - 0x2160);

      break;

    case 0x2170 ... 0x2179:

      buf[0] = '\x26';

      buf[1] = '\x35' + (ch - 0x2170);

      break;

    case 0x2190 ... 0x2199:

      cp = __cns11643l1_from_ucs4_tab5[ch - 0x2190];

      break;

    case 0x2215 ... 0x2267:

      cp = __cns11643l1_from_ucs4_tab6[ch - 0x2215];

      break;

    case 0x22a5:

      cp = "\x22\x47";

      break;

    case 0x22bf:

      cp = "\x22\x4a";

      break;

    case 0x2400 ... 0x2421:

      cp = __cns11643l1_from_ucs4_tab7[ch - 0x2400];

      break;

    case 0x2460 ... 0x247d:

      cp = __cns11643l1_from_ucs4_tab8[ch - 0x2460];

      break;

    case 0x2500 ... 0x2642:

      cp = __cns11643l1_from_ucs4_tab9[ch - 0x2500];

      break;

    case 0x3000 ... 0x3029:

      cp = __cns11643l1_from_ucs4_tab10[ch - 0x3000];

      break;

    case 0x30fb:

      cp = "\x21\x26";

      break;

    case 0x3105 ... 0x3129:

      buf[0] = '\x25';

      buf[1] = '\x47' + (ch - 0x3105);

      break;

    case 0x32a3:

      cp = "\x22\x21";

      break;

    case 0x338e ... 0x33d5:

      cp = __cns11643l1_from_ucs4_tab11[ch - 0x338e];

      break;

    case 0x4e00 ... 0x9f9c:

      cp = __cns11643l1_from_ucs4_tab12[ch - 0x4e00];

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

	break;

      /* FALLTHROUGH.  Let's try the other planes.  */

    case 0x3400 ... 0x4dff:

    case 0x9f9d ... 0x9fa5:

      /* Let's try the other planes.  */

      needed = 3;

      cp = __cns11643_from_ucs4p0_tab[ch - 0x3400];

      break;

    case 0xfa28:

      needed = 3;

      cp = "\x0f\x58\x4c";

      break;

    case 0xfe30 ... 0xfe6b:

      cp = __cns11643l1_from_ucs4_tab13[ch - 0xfe30];

      break;

    case 0xff01 ... 0xff5d:

      cp = __cns11643l1_from_ucs4_tab14[ch - 0xff01];

      break;

    case 0xffe0:

      cp = "\x22\x66";

      break;

    case 0xffe1:

      cp = "\x22\x67";

      break;

    case 0xffe5:

      cp = "\x22\x64";

      break;

    case 0x20000 ... 0x2a6d6:

      needed = 3;

      cp = __cns11643_from_ucs4p2_tab[ch - 0x20000];

      break;

    case 0x2f800 ... 0x2fa1d:

      needed = 3;

      cp = __cns11643_from_ucs4p2c_tab[ch - 0x2f800];

      break;

    default:

      return __UNKNOWN_10646_CHAR;

    }

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

    return __UNKNOWN_10646_CHAR;

  if (avail < needed)

    return 0;

  s[0] = cp[0];

  s[1] = cp[1];

  if (needed == 3)

    s[2] = cp[2];

  return needed;

}