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shift_jisx0213.c

/* Conversion from and to Shift_JISX0213.
   Copyright (C) 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Bruno Haible <bruno@clisp.org>, 2002.

   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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <dlfcn.h>
#include <stdint.h>
#include <gconv.h>

/* The structure of Shift_JISX0213 is as follows:

   0x00..0x7F: ISO646-JP, an ASCII variant

   0x{A1..DF}: JISX0201 Katakana.

   0x{81..9F,E0..EF}{40..7E,80..FC}: JISX0213 plane 1.

   0x{F0..FC}{40..7E,80..FC}: JISX0213 plane 2, with irregular row mapping.

   Note that some JISX0213 characters are not contained in Unicode 3.2
   and are therefore best represented as sequences of Unicode characters.
*/

#include "jisx0213.h"

/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME          "SHIFT_JISX0213//"
#define FROM_LOOP       from_shift_jisx0213
#define TO_LOOP               to_shift_jisx0213
#define DEFINE_INIT           1
#define DEFINE_FINI           1
#define FROM_LOOP_MIN_NEEDED_FROM   1
#define FROM_LOOP_MAX_NEEDED_FROM   2
#define FROM_LOOP_MIN_NEEDED_TO           4
#define FROM_LOOP_MAX_NEEDED_TO           8
#define TO_LOOP_MIN_NEEDED_FROM           4
#define TO_LOOP_MAX_NEEDED_FROM           4
#define TO_LOOP_MIN_NEEDED_TO       1
#define TO_LOOP_MAX_NEEDED_TO       2
#define PREPARE_LOOP \
  int saved_state;                                                \
  int *statep = &data->__statep->__count;
#define EXTRA_LOOP_ARGS       , statep


/* Since we might have to reset input pointer we must be able to save
   and restore the state.  */
#define SAVE_RESET_STATE(Save) \
  if (Save)                                                 \
    saved_state = *statep;                                        \
  else                                                            \
    *statep = saved_state


/* During Shift_JISX0213 to UCS-4 conversion, the COUNT element of the state
   contains the last UCS-4 character, shifted by 3 bits.
   During UCS-4 to Shift_JISX0213 conversion, the COUNT element of the state
   contains the last two bytes to be output, shifted by 3 bits.  */

/* Since this is a stateful encoding we have to provide code which resets
   the output state to the initial state.  This has to be done during the
   flushing.  */
#define EMIT_SHIFT_TO_INIT \
  if (data->__statep->__count != 0)                               \
    {                                                       \
      if (FROM_DIRECTION)                                         \
      {                                                     \
        if (__builtin_expect (outbuf + 4 <= outend, 1))                 \
          {                                                 \
            /* Write out the last character.  */                        \
            *((uint32_t *) outbuf)++ = data->__statep->__count >> 3;          \
            data->__statep->__count = 0;                          \
          }                                                 \
        else                                                      \
          /* We don't have enough room in the output buffer.  */        \
          status = __GCONV_FULL_OUTPUT;                           \
      }                                                     \
      else                                                  \
      {                                                     \
        if (__builtin_expect (outbuf + 2 <= outend, 1))                 \
          {                                                 \
            /* Write out the last character.  */                        \
            uint32_t lasttwo = data->__statep->__count >> 3;                  \
            *outbuf++ = (lasttwo >> 8) & 0xff;                    \
            *outbuf++ = lasttwo & 0xff;                           \
            data->__statep->__count = 0;                          \
          }                                                 \
        else                                                      \
          /* We don't have enough room in the output buffer.  */        \
          status = __GCONV_FULL_OUTPUT;                           \
      }                                                     \
    }


/* First define the conversion function from Shift_JISX0213 to UCS-4.  */
#define MIN_NEEDED_INPUT      FROM_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT      FROM_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT     FROM_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT     FROM_LOOP_MAX_NEEDED_TO
#define LOOPFCT               FROM_LOOP
#define BODY \
  {                                                         \
    uint32_t ch;                                            \
                                                            \
    /* Determine whether there is a buffered character pending.  */           \
    ch = *statep >> 3;                                            \
    if (__builtin_expect (ch == 0, 1))                                  \
      {                                                           \
      /* No - so look at the next input byte.  */                       \
      ch = *inptr;                                                \
                                                            \
      if (ch < 0x80)                                              \
        {                                                   \
          /* Plain ISO646-JP character.  */                             \
          if (__builtin_expect (ch == 0x5c, 0))                   \
            ch = 0xa5;                                      \
          else if (__builtin_expect (ch == 0x7e, 0))                    \
            ch = 0x203e;                                          \
          ++inptr;                                                \
        }                                                   \
      else if (ch >= 0xa1 && ch <= 0xdf)                          \
        {                                                   \
          /* Half-width katakana.  */                                   \
          ch += 0xfec0;                                     \
          ++inptr;                                                \
        }                                                   \
      else if ((ch >= 0x81 && ch <= 0x9f) || (ch >= 0xe0 && ch <= 0xfc))    \
        {                                                   \
          /* Two byte character.  */                                    \
          uint32_t ch2;                                     \
                                                            \
          if (__builtin_expect (inptr + 1 >= inend, 0))                 \
            {                                                     \
            /* The second byte is not available.  */              \
            result = __GCONV_INCOMPLETE_INPUT;                    \
            break;                                                \
            }                                                     \
                                                            \
          ch2 = inptr[1];                                         \
                                                            \
          /* The second byte must be in the range 0x{40..7E,80..FC}.  */    \
          if (__builtin_expect (ch2 < 0x40 || ch2 == 0x7f || ch2 > 0xfc, 0))\
            {                                                     \
            /* This is an illegal character.  */                        \
            STANDARD_FROM_LOOP_ERR_HANDLER (1);                   \
            }                                                     \
                                                            \
          /* Convert to row and column.  */                             \
          if (ch < 0xe0)                                          \
            ch -= 0x81;                                     \
          else                                              \
            ch -= 0xc1;                                     \
          if (ch2 < 0x80)                                         \
            ch2 -= 0x40;                                          \
          else                                              \
            ch2 -= 0x41;                                          \
          /* Now 0 <= ch <= 0x3b, 0 <= ch2 <= 0xbb.  */                 \
          ch = 2 * ch;                                      \
          if (ch2 >= 0x5e)                                        \
            ch2 -= 0x5e, ch++;                                    \
          ch2 += 0x21;                                      \
          if (ch >= 0x5e)                                         \
            {                                                     \
            /* Handling of JISX 0213 plane 2 rows.  */                  \
            if (ch >= 0x67)                                       \
              ch += 230;                                          \
            else if (ch >= 0x63 || ch == 0x5f)                    \
              ch += 168;                                          \
            else                                            \
              ch += 162;                                          \
            }                                                     \
                                                            \
          ch = jisx0213_to_ucs4 (0x121 + ch, ch2);                      \
                                                            \
          if (ch == 0)                                      \
            {                                                     \
            /* This is an illegal character.  */                        \
            STANDARD_FROM_LOOP_ERR_HANDLER (1);                   \
            }                                                     \
                                                            \
          inptr += 2;                                             \
                                                            \
          if (ch < 0x80)                                          \
            {                                                     \
            /* It's a combining character.  */                    \
            uint32_t u1 = __jisx0213_to_ucs_combining[ch - 1][0];       \
            uint32_t u2 = __jisx0213_to_ucs_combining[ch - 1][1];       \
                                                            \
            put32 (outptr, u1);                                   \
            outptr += 4;                                          \
                                                            \
            /* See whether we have room for two characters.  */         \
            if (outptr + 4 <= outend)                             \
              {                                             \
                put32 (outptr, u2);                               \
                outptr += 4;                                \
                continue;                                         \
              }                                             \
                                                            \
            /* Otherwise store only the first character now, and        \
               put the second one into the queue.  */             \
            *statep = u2 << 3;                                    \
            /* Tell the caller why we terminate the loop.  */           \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
        }                                                   \
      else                                                  \
        {                                                   \
          /* This is illegal.  */                                 \
          STANDARD_FROM_LOOP_ERR_HANDLER (1);                           \
        }                                                   \
      }                                                           \
                                                            \
    put32 (outptr, ch);                                           \
    outptr += 4;                                            \
  }
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS      , int *statep
#define ONEBYTE_BODY \
  {                                                         \
    if (c < 0x80)                                           \
      {                                                           \
      if (c == 0x5c)                                              \
        return 0xa5;                                              \
      if (c == 0x7e)                                              \
        return 0x203e;                                      \
      return c;                                             \
      }                                                           \
    if (c >= 0xa1 && c <= 0xdf)                                         \
      return 0xfec0 + c;                                          \
    return WEOF;                                            \
  }
#include <iconv/loop.c>


/* Next, define the other direction, from UCS-4 to Shift_JISX0213.  */

/* Composition tables for each of the relevant combining characters.  */
static const struct
{
  uint16_t base;
  uint16_t composed;
} comp_table_data[] =
{
#define COMP_TABLE_IDX_02E5 0
#define COMP_TABLE_LEN_02E5 1
  { 0x8684, 0x8685 }, /* 0x12B65 = 0x12B64 U+02E5 */
#define COMP_TABLE_IDX_02E9 (COMP_TABLE_IDX_02E5 + COMP_TABLE_LEN_02E5)
#define COMP_TABLE_LEN_02E9 1
  { 0x8680, 0x8686 }, /* 0x12B66 = 0x12B60 U+02E9 */
#define COMP_TABLE_IDX_0300 (COMP_TABLE_IDX_02E9 + COMP_TABLE_LEN_02E9)
#define COMP_TABLE_LEN_0300 5
  { 0x857b, 0x8663 }, /* 0x12B44 = 0x1295C U+0300 */
  { 0x8657, 0x8667 }, /* 0x12B48 = 0x12B38 U+0300 */
  { 0x8656, 0x8669 }, /* 0x12B4A = 0x12B37 U+0300 */
  { 0x864f, 0x866b }, /* 0x12B4C = 0x12B30 U+0300 */
  { 0x8662, 0x866d }, /* 0x12B4E = 0x12B43 U+0300 */
#define COMP_TABLE_IDX_0301 (COMP_TABLE_IDX_0300 + COMP_TABLE_LEN_0300)
#define COMP_TABLE_LEN_0301 4
  { 0x8657, 0x8668 }, /* 0x12B49 = 0x12B38 U+0301 */
  { 0x8656, 0x866a }, /* 0x12B4B = 0x12B37 U+0301 */
  { 0x864f, 0x866c }, /* 0x12B4D = 0x12B30 U+0301 */
  { 0x8662, 0x866e }, /* 0x12B4F = 0x12B43 U+0301 */
#define COMP_TABLE_IDX_309A (COMP_TABLE_IDX_0301 + COMP_TABLE_LEN_0301)
#define COMP_TABLE_LEN_309A 14
  { 0x82a9, 0x82f5 }, /* 0x12477 = 0x1242B U+309A */
  { 0x82ab, 0x82f6 }, /* 0x12478 = 0x1242D U+309A */
  { 0x82ad, 0x82f7 }, /* 0x12479 = 0x1242F U+309A */
  { 0x82af, 0x82f8 }, /* 0x1247A = 0x12431 U+309A */
  { 0x82b1, 0x82f9 }, /* 0x1247B = 0x12433 U+309A */
  { 0x834a, 0x8397 }, /* 0x12577 = 0x1252B U+309A */
  { 0x834c, 0x8398 }, /* 0x12578 = 0x1252D U+309A */
  { 0x834e, 0x8399 }, /* 0x12579 = 0x1252F U+309A */
  { 0x8350, 0x839a }, /* 0x1257A = 0x12531 U+309A */
  { 0x8352, 0x839b }, /* 0x1257B = 0x12533 U+309A */
  { 0x835a, 0x839c }, /* 0x1257C = 0x1253B U+309A */
  { 0x8363, 0x839d }, /* 0x1257D = 0x12544 U+309A */
  { 0x8367, 0x839e }, /* 0x1257E = 0x12548 U+309A */
  { 0x83f3, 0x83f6 }, /* 0x12678 = 0x12675 U+309A */
};

#define MIN_NEEDED_INPUT      TO_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT      TO_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT     TO_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT     TO_LOOP_MAX_NEEDED_TO
#define LOOPFCT               TO_LOOP
#define BODY \
  {                                                         \
    uint32_t ch = get32 (inptr);                                  \
                                                            \
    if ((*statep >> 3) != 0)                                      \
      {                                                           \
      /* Attempt to combine the last character with this one.  */       \
      uint16_t lasttwo = *statep >> 3;                            \
      unsigned int idx;                                     \
      unsigned int len;                                     \
                                                            \
      if (ch == 0x02e5)                                     \
        idx = COMP_TABLE_IDX_02E5, len = COMP_TABLE_LEN_02E5;                 \
      else if (ch == 0x02e9)                                      \
        idx = COMP_TABLE_IDX_02E9, len = COMP_TABLE_LEN_02E9;                 \
      else if (ch == 0x0300)                                      \
        idx = COMP_TABLE_IDX_0300, len = COMP_TABLE_LEN_0300;                 \
      else if (ch == 0x0301)                                      \
        idx = COMP_TABLE_IDX_0301, len = COMP_TABLE_LEN_0301;                 \
      else if (ch == 0x309a)                                      \
        idx = COMP_TABLE_IDX_309A, len = COMP_TABLE_LEN_309A;                 \
      else                                                  \
        goto not_combining;                                       \
                                                            \
      do                                                    \
        if (comp_table_data[idx].base == lasttwo)                       \
          break;                                            \
      while (++idx, --len > 0);                                   \
                                                            \
      if (len > 0)                                                \
        {                                                   \
          /* Output the combined character.  */                   \
          if (__builtin_expect (outptr + 1 >= outend, 0))               \
            {                                                     \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          lasttwo = comp_table_data[idx].composed;                      \
          *outptr++ = (lasttwo >> 8) & 0xff;                            \
          *outptr++ = lasttwo & 0xff;                                   \
          *statep = 0;                                      \
          inptr += 4;                                             \
          continue;                                               \
        }                                                   \
                                                            \
      not_combining:                                              \
      /* Output the buffered character.  */                             \
      if (__builtin_expect (outptr + 1 >= outend, 0))                   \
        {                                                   \
          result = __GCONV_FULL_OUTPUT;                           \
          break;                                            \
        }                                                   \
      *outptr++ = (lasttwo >> 8) & 0xff;                          \
      *outptr++ = lasttwo & 0xff;                                 \
      *statep = 0;                                                \
      continue;                                             \
      }                                                           \
                                                            \
    if (ch < 0x80)                                                \
      /* Plain ISO646-JP character.  */                                 \
      *outptr++ = ch;                                             \
    else if (ch == 0xa5)                                          \
      *outptr++ = 0x5c;                                           \
    else if (ch == 0x203e)                                        \
      *outptr++ = 0x7e;                                           \
    else if (ch >= 0xff61 && ch <= 0xff9f)                              \
      /* Half-width katakana.  */                                 \
      *outptr++ = ch - 0xfec0;                                          \
    else                                                    \
      {                                                           \
      unsigned int s1, s2;                                        \
      uint32_t jch = ucs4_to_jisx0213 (ch);                             \
      if (jch == 0)                                               \
        {                                                   \
          UNICODE_TAG_HANDLER (ch, 4);                            \
                                                            \
          /* Illegal character.  */                               \
          STANDARD_TO_LOOP_ERR_HANDLER (4);                             \
        }                                                   \
                                                            \
      /* Convert it to shifted representation.  */                      \
      s1 = jch >> 8;                                              \
      s2 = jch & 0x7f;                                            \
      s1 -= 0x21;                                           \
      s2 -= 0x21;                                           \
      if (s1 >= 0x5e)                                             \
        {                                                   \
          /* Handling of JISX 0213 plane 2 rows.  */                    \
          if (s1 >= 0xcd) /* rows 0x26E..0x27E */                       \
            s1 -= 102;                                      \
          else if (s1 >= 0x8b || s1 == 0x87) /* rows 0x228, 0x22C..0x22F */ \
            s1 -= 40;                                             \
          else /* rows 0x221, 0x223..0x225 */                           \
            s1 -= 34;                                             \
          /* Now 0x5e <= s1 <= 0x77.  */                          \
        }                                                   \
      if (s1 & 1)                                           \
        s2 += 0x5e;                                               \
      s1 = s1 >> 1;                                               \
      if (s1 < 0x1f)                                              \
        s1 += 0x81;                                               \
      else                                                  \
        s1 += 0xc1;                                               \
      if (s2 < 0x3f)                                              \
        s2 += 0x40;                                               \
      else                                                  \
        s2 += 0x41;                                               \
                                                            \
      if (jch & 0x0080)                                     \
        {                                                   \
          /* A possible match in comp_table_data.  We have to buffer it.  */\
                                                            \
          /* We know it's a JISX 0213 plane 1 character.  */                  \
          assert ((jch & 0x8000) == 0);                           \
                                                            \
          *statep = ((s1 << 8) | s2) << 3;                              \
          inptr += 4;                                             \
          continue;                                               \
        }                                                   \
                                                            \
      /* Output the shifted representation.  */                   \
      if (__builtin_expect (outptr + 1 >= outend, 0))                   \
        {                                                   \
          result = __GCONV_FULL_OUTPUT;                           \
          break;                                            \
        }                                                   \
      *outptr++ = s1;                                             \
      *outptr++ = s2;                                             \
      }                                                           \
                                                            \
    inptr += 4;                                                   \
  }
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS      , int *statep
#include <iconv/loop.c>


/* Now define the toplevel functions.  */
#include <iconv/skeleton.c>

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