/* Conversion from and to Shift_JISX0213.

   Copyright (C) 2002-2018 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, see

   <http://www.gnu.org/licenses/>.  */

#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 ONE_DIRECTION		0

#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 (__glibc_likely (outbuf + 4 <= outend))			      \

	    {								      \

	      /* 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 (__glibc_likely (outbuf + 2 <= outend))			      \

	    {								      \

	      /* 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 (__glibc_likely (ch == 0))					      \

      {									      \

	/* No - so look at the next input byte.  */			      \

	ch = *inptr;							      \

									      \

	if (ch < 0x80)							      \

	  {								      \

	    /* Plain ISO646-JP character.  */				      \

	    if (__glibc_unlikely (ch == 0x5c))				      \

	      ch = 0xa5;						      \

	    else if (__glibc_unlikely (ch == 0x7e))			      \

	      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 (__glibc_unlikely (inptr + 1 >= inend))			      \

	      {								      \

		/* 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 (__glibc_unlikely (ch2 < 0x40 || ch2 == 0x7f || ch2 > 0xfc))   \

	      {								      \

		/* 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 (__glibc_unlikely (outptr + 1 >= outend))		      \

	      {								      \

		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 (__glibc_unlikely (outptr + 1 >= outend))			      \

	  {								      \

	    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 (__glibc_unlikely (outptr + 1 >= outend))			      \

	  {								      \

	    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>