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ibm943.c

/* Conversion from and to IBM943.
   Copyright (C) 2000-2002, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Masahide Washizawa <washi@jp.ibm.com>, 2000.

   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 <stdbool.h>
#include "ibm943.h"

#define FROM      0
#define TO  1

/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME    "IBM943//"
#define FROM_LOOP from_ibm943
#define TO_LOOP         to_ibm943

/* Definitions of initialization and destructor function.  */
#define DEFINE_INIT     1
#define DEFINE_FINI     1

#define MIN_NEEDED_FROM 1
#define MAX_NEEDED_FROM 2
#define MIN_NEEDED_TO   4

/* First, define the conversion function from IBM-943 to UCS4.  */
#define MIN_NEEDED_INPUT      MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT      MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT     MIN_NEEDED_TO
#define LOOPFCT               FROM_LOOP
#define BODY \
  {                                                         \
    const struct gap *rp2 = __ibm943db_to_ucs4_idx;                     \
    uint32_t ch = *inptr;                                         \
    uint32_t res;                                           \
                                                            \
    if (__builtin_expect (ch == 0x80, 0)                          \
      || __builtin_expect (ch == 0xa0, 0)                         \
      || __builtin_expect (ch == 0xfd, 0)                         \
      || __builtin_expect (ch == 0xfe, 0)                         \
      || __builtin_expect (ch == 0xff, 0))                              \
      {                                                           \
      /* This is an illegal character.  */                              \
      STANDARD_FROM_LOOP_ERR_HANDLER (1);                         \
      }                                                           \
                                                            \
    /* Use the IBM943 table for single byte.  */                        \
    if (__builtin_expect (ch > 0xdf, 0)                                 \
      || (res = __ibm943sb_to_ucs4[ch],                           \
          __builtin_expect (res == 0, 0) && ch != 0))                   \
      {                                                           \
      /* Use the IBM943 table for double byte.  */                      \
      if (__builtin_expect (inptr + 1 >= inend, 0))                     \
        {                                                   \
          /* The second character is not available.                     \
             Store the intermediate result.  */                   \
          result = __GCONV_INCOMPLETE_INPUT;                            \
          break;                                            \
        }                                                   \
                                                            \
      ch = (ch * 0x100) + inptr[1];                               \
      while (ch > rp2->end)                                       \
        ++rp2;                                              \
                                                            \
      if (__builtin_expect (rp2 == NULL, 0)                             \
          || __builtin_expect (ch < rp2->start, 0)                      \
          || (res = __ibm943db_to_ucs4[ch + rp2->idx],                  \
          __builtin_expect (res, '\1') == 0 && ch !=0))                 \
        {                                                   \
          /* This is an illegal character.  */                    \
          STANDARD_FROM_LOOP_ERR_HANDLER (2);                           \
        }                                                   \
      else                                                  \
        {                                                   \
          put32 (outptr, res);                                    \
          outptr += 4;                                      \
          inptr += 2;                                             \
        }                                                   \
      }                                                           \
    else                                                    \
      {                                                           \
      if (res == 0x1c)                                      \
        res = 0x1a;                                               \
      else if (res == 0x7f)                                       \
        res = 0x1c;                                               \
      else if (res == 0xa5)                                       \
        res = 0x5c;                                               \
      else if (res == 0x203e)                                     \
        res = 0x7e;                                               \
      else if (res == 0x1a)                                       \
        res = 0x7f;                                               \
      put32 (outptr, res);                                        \
      outptr += 4;                                                \
      inptr++;                                              \
      }                                                           \
  }
#define LOOP_NEED_FLAGS
#define ONEBYTE_BODY \
  {                                                         \
    if (c == 0x80 || c == 0xa0 || c >= 0xe0)                            \
      return WEOF;                                                \
    uint32_t res = __ibm943sb_to_ucs4[c];                         \
    if (res == 0 && c != 0)                                       \
      return WEOF;                                                \
    if (res == 0x1c)                                              \
      res = 0x1a;                                           \
    else if (res == 0x7f)                                         \
      res = 0x1c;                                           \
    else if (res == 0xa5)                                         \
      res = 0x5c;                                           \
    else if (res == 0x203e)                                       \
      res = 0x7e;                                           \
    else if (res == 0x1a)                                         \
      res = 0x7f;                                           \
    return res;                                                   \
  }
#include <iconv/loop.c>

/* Next, define the other direction.  */
#define MIN_NEEDED_INPUT      MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT     MIN_NEEDED_FROM
#define MAX_NEEDED_OUTPUT     MAX_NEEDED_FROM
#define LOOPFCT               TO_LOOP
#define BODY \
  {                                                         \
    const struct gap *rp = __ucs4_to_ibm943sb_idx;                      \
    unsigned char sc;                                             \
    uint32_t ch = get32(inptr);                                         \
    bool found = true;                                            \
    uint32_t i;                                                   \
    uint32_t low;                                           \
    uint32_t high;                                                \
    uint16_t pccode;                                              \
                                                            \
    if (__builtin_expect (ch >= 0xffff, 0))                             \
      {                                                           \
      UNICODE_TAG_HANDLER (ch, 4);                                \
      rp = NULL;                                            \
      }                                                           \
    else                                                    \
      while (ch > rp->end)                                        \
      ++rp;                                                 \
                                                            \
    /* Use the UCS4 table for single byte.  */                          \
    if (__builtin_expect (rp == NULL, 0)                          \
      || __builtin_expect (ch < rp->start, 0)                           \
      || (sc = __ucs4_to_ibm943sb[ch + rp->idx],                        \
      __builtin_expect (sc, '\1') == '\0' && ch != L'\0'))              \
      {                                                           \
                                                            \
      /* Use the UCS4 table for double byte.  */                        \
      found = false;                                              \
      low = 0;                                              \
      high = (sizeof (__ucs4_to_ibm943db) >> 1)                   \
            / sizeof (__ucs4_to_ibm943db[0][FROM]);                     \
      pccode = ch;                                                \
      if (__builtin_expect (rp != NULL, 1))                             \
        while (low < high)                                        \
          {                                                 \
            i = (low + high) >> 1;                                \
            if (pccode < __ucs4_to_ibm943db[i][FROM])                   \
            high = i;                                       \
            else if (pccode > __ucs4_to_ibm943db[i][FROM])              \
            low = i + 1;                                          \
            else                                            \
            {                                               \
              pccode = __ucs4_to_ibm943db[i][TO];                       \
              found = true;                                       \
              break;                                        \
            }                                               \
          }                                                 \
      if (found)                                            \
        {                                                   \
          if (__builtin_expect (outptr + 2 > outend, 0))                \
            {                                                     \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          *outptr++ = pccode >> 8 & 0xff;                         \
          *outptr++ = pccode & 0xff;                                    \
        }                                                   \
      else                                                  \
        {                                                   \
          /* This is an illegal character.  */                    \
          STANDARD_TO_LOOP_ERR_HANDLER (4);                             \
        }                                                   \
      }                                                           \
    else                                                    \
      {                                                           \
      if (__builtin_expect (outptr + 1 > outend, 0))                    \
        {                                                   \
          result = __GCONV_FULL_OUTPUT;                           \
          break;                                            \
        }                                                   \
      if (ch == 0x5c)                                             \
        *outptr++ = 0x5c;                                         \
      else if (ch == 0x7e)                                        \
        *outptr++ = 0x7e;                                         \
      else                                                  \
        *outptr++ = sc;                                     \
      }                                                           \
                                                            \
    /* Now that we wrote the output increment the input pointer.  */          \
    inptr += 4;                                                   \
  }
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>

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

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