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euc-jisx0213.c

/* Conversion from and to EUC-JISX0213.
   Copyright (C) 2002, 2004 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 EUC-JISX0213 is as follows:

   0x00..0x7F: ASCII

   0x8E{A1..FE}: JISX0201 Katakana, with prefix 0x8E, offset by +0x80.

   0x8F{A1..FE}{A1..FE}: JISX0213 plane 2, with prefix 0x8F, offset by +0x8080.

   0x{A1..FE}{A1..FE}: JISX0213 plane 1, offset by +0x8080.

   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          "EUC-JISX0213//"
#define FROM_LOOP       from_euc_jisx0213
#define TO_LOOP               to_euc_jisx0213
#define DEFINE_INIT           1
#define DEFINE_FINI           1
#define FROM_LOOP_MIN_NEEDED_FROM   1
#define FROM_LOOP_MAX_NEEDED_FROM   3
#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       3
#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 EUC-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 EUC-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;            \
            outbuf += sizeof (uint32_t);                          \
            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 EUC-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 ASCII character.  */                                   \
        ++inptr;                                            \
      else if ((ch >= 0xa1 && ch <= 0xfe) || ch == 0x8e || ch == 0x8f)      \
        {                                                   \
          /* Two or three 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 >= 0xa1 and <= 0xfe.  */                 \
          if (__builtin_expect (ch2 < 0xa1 || ch2 > 0xfe, 0))                 \
            {                                                     \
            /* This is an illegal character.  */                        \
            STANDARD_FROM_LOOP_ERR_HANDLER (1);                   \
            }                                                     \
                                                            \
          if (ch == 0x8e)                                         \
            {                                                     \
            /* Half-width katakana.  */                           \
            if (__builtin_expect (ch2 > 0xdf, 0))                       \
              STANDARD_FROM_LOOP_ERR_HANDLER (1);                       \
                                                            \
            ch = ch2 + 0xfec0;                                    \
            inptr += 2;                                     \
            }                                                     \
          else                                              \
            {                                                     \
            const unsigned char *endp;                            \
                                                            \
            if (ch == 0x8f)                                       \
              {                                             \
                /* JISX 0213 plane 2.  */                         \
                uint32_t ch3;                               \
                                                            \
                if (__builtin_expect (inptr + 2 >= inend, 0))           \
                  {                                               \
                  /* The third byte is not available.  */               \
                  result = __GCONV_INCOMPLETE_INPUT;              \
                  break;                                          \
                  }                                               \
                                                            \
                ch3 = inptr[2];                                   \
                endp = inptr + 3;                                 \
                                                            \
                ch = jisx0213_to_ucs4 (0x200 - 0x80 + ch2, ch3 ^ 0x80);   \
              }                                             \
            else                                            \
              {                                             \
                /* JISX 0213 plane 1.  */                         \
                endp = inptr + 2;                                 \
                                                            \
                ch = jisx0213_to_ucs4 (0x100 - 0x80 + ch, ch2 ^ 0x80);    \
              }                                             \
                                                            \
            if (ch == 0)                                          \
              /* This is an illegal character.  */                      \
              STANDARD_FROM_LOOP_ERR_HANDLER (1);                       \
                                                            \
            inptr = endp;                                         \
                                                            \
            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)                                           \
      return c;                                                   \
    else                                                    \
      return WEOF;                                                \
  }
#include <iconv/loop.c>


/* Next, define the other direction, from UCS-4 to EUC-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
  { 0xabe4, 0xabe5 }, /* 0x12B65 = 0x12B64 U+02E5 */
#define COMP_TABLE_IDX_02E9 (COMP_TABLE_IDX_02E5 + COMP_TABLE_LEN_02E5)
#define COMP_TABLE_LEN_02E9 1
  { 0xabe0, 0xabe6 }, /* 0x12B66 = 0x12B60 U+02E9 */
#define COMP_TABLE_IDX_0300 (COMP_TABLE_IDX_02E9 + COMP_TABLE_LEN_02E9)
#define COMP_TABLE_LEN_0300 5
  { 0xa9dc, 0xabc4 }, /* 0x12B44 = 0x1295C U+0300 */
  { 0xabb8, 0xabc8 }, /* 0x12B48 = 0x12B38 U+0300 */
  { 0xabb7, 0xabca }, /* 0x12B4A = 0x12B37 U+0300 */
  { 0xabb0, 0xabcc }, /* 0x12B4C = 0x12B30 U+0300 */
  { 0xabc3, 0xabce }, /* 0x12B4E = 0x12B43 U+0300 */
#define COMP_TABLE_IDX_0301 (COMP_TABLE_IDX_0300 + COMP_TABLE_LEN_0300)
#define COMP_TABLE_LEN_0301 4
  { 0xabb8, 0xabc9 }, /* 0x12B49 = 0x12B38 U+0301 */
  { 0xabb7, 0xabcb }, /* 0x12B4B = 0x12B37 U+0301 */
  { 0xabb0, 0xabcd }, /* 0x12B4D = 0x12B30 U+0301 */
  { 0xabc3, 0xabcf }, /* 0x12B4F = 0x12B43 U+0301 */
#define COMP_TABLE_IDX_309A (COMP_TABLE_IDX_0301 + COMP_TABLE_LEN_0301)
#define COMP_TABLE_LEN_309A 14
  { 0xa4ab, 0xa4f7 }, /* 0x12477 = 0x1242B U+309A */
  { 0xa4ad, 0xa4f8 }, /* 0x12478 = 0x1242D U+309A */
  { 0xa4af, 0xa4f9 }, /* 0x12479 = 0x1242F U+309A */
  { 0xa4b1, 0xa4fa }, /* 0x1247A = 0x12431 U+309A */
  { 0xa4b3, 0xa4fb }, /* 0x1247B = 0x12433 U+309A */
  { 0xa5ab, 0xa5f7 }, /* 0x12577 = 0x1252B U+309A */
  { 0xa5ad, 0xa5f8 }, /* 0x12578 = 0x1252D U+309A */
  { 0xa5af, 0xa5f9 }, /* 0x12579 = 0x1252F U+309A */
  { 0xa5b1, 0xa5fa }, /* 0x1257A = 0x12531 U+309A */
  { 0xa5b3, 0xa5fb }, /* 0x1257B = 0x12533 U+309A */
  { 0xa5bb, 0xa5fc }, /* 0x1257C = 0x1253B U+309A */
  { 0xa5c4, 0xa5fd }, /* 0x1257D = 0x12544 U+309A */
  { 0xa5c8, 0xa5fe }, /* 0x1257E = 0x12548 U+309A */
  { 0xa6f5, 0xa6f8 }, /* 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 ASCII character.  */                               \
      *outptr++ = ch;                                             \
    else if (ch >= 0xff61 && ch <= 0xff9f)                              \
      {                                                           \
      /* Half-width katakana.  */                                 \
      if (__builtin_expect (outptr + 1 >= outend, 0))                   \
        {                                                   \
          result = __GCONV_FULL_OUTPUT;                           \
          break;                                            \
        }                                                   \
      *outptr++ = 0x8e;                                     \
      *outptr++ = ch - 0xfec0;                                    \
      }                                                           \
    else                                                    \
      {                                                           \
      uint32_t jch = ucs4_to_jisx0213 (ch);                             \
      if (jch == 0)                                               \
        {                                                   \
          UNICODE_TAG_HANDLER (ch, 4);                            \
                                                            \
          /* Illegal character.  */                               \
          STANDARD_TO_LOOP_ERR_HANDLER (4);                             \
        }                                                   \
                                                            \
      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 = (jch | 0x8080) << 3;                          \
          inptr += 4;                                             \
          continue;                                               \
        }                                                   \
                                                            \
      if (jch & 0x8000)                                     \
        {                                                   \
          /* JISX 0213 plane 2.  */                               \
          if (__builtin_expect (outptr + 2 >= outend, 0))               \
            {                                                     \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          *outptr++ = 0x8f;                                       \
        }                                                   \
      else                                                  \
        {                                                   \
          /* JISX 0213 plane 1.  */                               \
          if (__builtin_expect (outptr + 1 >= outend, 0))               \
            {                                                     \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
        }                                                   \
      *outptr++ = (jch >> 8) | 0x80;                                    \
      *outptr++ = (jch & 0xff) | 0x80;                            \
      }                                                           \
                                                            \
    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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