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/*

 * Copyright (c) 2003-2004, Artem B. Bityuckiy

 * Copyright (c) 1999,2000, Konstantin Chuguev. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include "cesbi.h"

#if defined (ICONV_TO_UCS_CES_UTF_16) \

 || defined (ICONV_FROM_UCS_CES_UTF_16)

#include <_ansi.h>

#include <reent.h>

#include <sys/types.h>

#include <stdlib.h>

#include <string.h>

#include <wchar.h>

#include "../lib/local.h"

#include "../lib/ucsconv.h"

#include "../lib/endian.h"

/*

 * On input UTF-16 converter interpret BOM and uses Big Endian byte order if BOM

 * is absent. UTF-16 converter outputs in System Endian and adds correspondent

 * BOM as first code. UTF-16LE and UTF-16BE converters ignore BOM on input and

 * don't output BOM.

 */

#define UTF16_UNDEFINED     0x00

#define UTF16_BIG_ENDIAN    0x01

#define UTF16_LITTLE_ENDIAN 0x02

#define UTF16_SYSTEM_ENDIAN 0x04

#define UTF16_BOM_WRITTEN   0x08

#define UTF16_BOM 0xFEFF

#define UTF_16   "utf_16"

#define UTF_16BE "utf_16be"

#define UTF_16LE "utf_16le"

static size_t

_DEFUN(utf_16_close, (rptr, data),

                     struct _reent *rptr _AND

                     _VOID_PTR data)

{

  _free_r(rptr, data);

  return 0;

}

#if defined (ICONV_FROM_UCS_CES_UTF_16)

static _VOID_PTR

_DEFUN(utf_16_init_from_ucs, (rptr, encoding),

                             struct _reent *rptr _AND

                             _CONST char *encoding)

{

  int *data;

  if ((data = (int *)_malloc_r (rptr, sizeof (int))) == NULL)

    return (_VOID_PTR)NULL;

  if (strcmp (encoding, UTF_16LE) == 0)

    *data = UTF16_LITTLE_ENDIAN;

  else if (strcmp (encoding, UTF_16BE) == 0)

    *data = UTF16_BIG_ENDIAN;

  else

    *data = UTF16_SYSTEM_ENDIAN;

  return (_VOID_PTR)data;

}

static size_t

_DEFUN(utf_16_convert_from_ucs, (data, in, outbuf, outbytesleft),

                                _VOID_PTR data         _AND

                                register ucs4_t in     _AND

                                unsigned char **outbuf _AND

                                size_t *outbytesleft)

{

  register ucs2_t *cp;

  register size_t bytes;

  register int *state;

  if (in > 0x0010FFFF || (in >= 0x0000D800 && in <= 0x0000DFFF)

      || in == 0x0000FFFF || in == 0x0000FFFE)

    return (size_t)ICONV_CES_INVALID_CHARACTER;

  state = (int *)data;

  bytes = (*state == UTF16_SYSTEM_ENDIAN) ? sizeof (ucs2_t) * 2

                                          : sizeof (ucs2_t);

  if (in > 0x0000FFFF)

    bytes += sizeof (ucs2_t);

  if (*outbytesleft < bytes)

    return (size_t)ICONV_CES_NOSPACE;

  cp = (ucs2_t *)*outbuf;

  if (*state == UTF16_SYSTEM_ENDIAN)

    {

      *cp++ = UTF16_BOM;

      *state |= UTF16_BOM_WRITTEN;

    }

  if (in < 0x00010000)

    {

      switch (*state)

        {

          case UTF16_LITTLE_ENDIAN:

            *cp = ICONV_HTOLES ((ucs2_t)in);

            break;

          case UTF16_BIG_ENDIAN:

            *cp = ICONV_HTOBES ((ucs2_t)in);

            break;

          case (UTF16_SYSTEM_ENDIAN | UTF16_BOM_WRITTEN):

            *cp = (ucs2_t)in;

            break;

        }

    }

  else

    {

      ucs2_t w1, w2;

      /* Process surrogate pair */

      in -= 0x00010000;

      w1 = ((ucs2_t)((in >> 10)) & 0x03FF) | 0xD800;

      w2 = (ucs2_t)(in & 0x000003FF) | 0xDC00;

      switch (*state)

        {

          case UTF16_LITTLE_ENDIAN:

            *cp++ = ICONV_HTOLES (w1);

            *cp = ICONV_HTOLES (w2);

            break;

          case UTF16_BIG_ENDIAN:

            *cp++ = ICONV_HTOBES (w1);

            *cp = ICONV_HTOBES (w2);

            break;

          case (UTF16_SYSTEM_ENDIAN | UTF16_BOM_WRITTEN):

            *cp++ = w1;

            *cp = w2;

            break;

        }

    }

  *outbuf += bytes;

  *outbytesleft -= bytes;

  return bytes;

}

#endif /* ICONV_FROM_UCS_CES_UTF_16 */

#if defined (ICONV_TO_UCS_CES_UTF_16)

static _VOID_PTR

_DEFUN(utf_16_init_to_ucs, (rptr, encoding),

                           struct _reent *rptr _AND

                           _CONST char *encoding)

{

  int *data;

  if ((data = (int *)_malloc_r (rptr, sizeof (int))) == NULL)

    return (_VOID_PTR)NULL;

  if (strcmp (encoding, UTF_16BE) == 0)

    *data = UTF16_BIG_ENDIAN;

  else if (strcmp (encoding, UTF_16LE) == 0)

    *data = UTF16_LITTLE_ENDIAN;

  else

    *data = UTF16_UNDEFINED;

  return (_VOID_PTR)data;

}

static ucs4_t

_DEFUN(utf_16_convert_to_ucs, (data, inbuf, inbytesleft),

                              _VOID_PTR data               _AND

                              _CONST unsigned char **inbuf _AND

                              size_t *inbytesleft)

{

  register ucs2_t w1;

  register ucs2_t w2;

  register ucs2_t *cp;

  int *state;

  ucs4_t res;

  int bytes = sizeof (ucs2_t);

  if (*inbytesleft < bytes)

    return (ucs4_t)ICONV_CES_BAD_SEQUENCE;

  state = (int *)data;

  cp = ((ucs2_t *)*inbuf);

  if (*state == UTF16_UNDEFINED)

    {

      if (*cp == ICONV_HTOLES(UTF16_BOM))

        *state = UTF16_LITTLE_ENDIAN;

      else

        *state = UTF16_BIG_ENDIAN;

     if (   *cp == ICONV_HTOBES (UTF16_BOM)

         || *cp == ICONV_HTOLES (UTF16_BOM))

       {

         if (*inbytesleft < (bytes += sizeof (ucs2_t)))

           return (ucs4_t)ICONV_CES_BAD_SEQUENCE;

         cp += 1;

       }

    }

  if (*state == UTF16_LITTLE_ENDIAN)

    w1 = ICONV_LETOHS (*cp);

  else

    w1 = ICONV_BETOHS (*cp);

  if (w1  < 0xD800 || w1 > 0xDFFF)

    {

      if (w1 == 0xFFFF || w1 == 0xFFFE)

        return (ucs4_t)ICONV_CES_INVALID_CHARACTER;

      res = (ucs4_t)w1;

    }

  else

    {

      /* Process surrogate pair */

      if (*inbytesleft < (bytes += 2))

        return (ucs4_t)ICONV_CES_BAD_SEQUENCE;

      if (w1 > 0xDBFF)

        /* Broken surrogate character */

        return (ucs4_t)ICONV_CES_INVALID_CHARACTER;

      cp += 1;

      if (*state == UTF16_LITTLE_ENDIAN)

        w2 = ICONV_LETOHS (*cp);

      else

        w2 = ICONV_BETOHS (*cp);

      if (w2 < 0xDC00 || w2 > 0xDFFF)

        /* Broken surrogate character */

        return (ucs4_t)ICONV_CES_INVALID_CHARACTER;

      res = (ucs4_t)(w2 & 0x03FF) | ((ucs4_t)(w1 & 0x03FF) << 10);

      res += 0x00010000;

    }

  *inbuf += bytes;

  *inbytesleft -= bytes;

  return res;

}

#endif /* ICONV_TO_UCS_CES_UTF_16 */

static int

_DEFUN(utf_16_get_mb_cur_max, (data),

                              _VOID_PTR data)

{

  return 6;

}

#if defined (ICONV_TO_UCS_CES_UTF_16)

_CONST iconv_to_ucs_ces_handlers_t

_iconv_to_ucs_ces_handlers_utf_16 =

{

  utf_16_init_to_ucs,

  utf_16_close,

  utf_16_get_mb_cur_max,

  NULL,

  NULL,

  NULL,

  utf_16_convert_to_ucs

};

#endif

#if defined (ICONV_FROM_UCS_CES_UTF_16)

_CONST iconv_from_ucs_ces_handlers_t

_iconv_from_ucs_ces_handlers_utf_16 =

{

  utf_16_init_from_ucs,

  utf_16_close,

  utf_16_get_mb_cur_max,

  NULL,

  NULL,

  NULL,

  utf_16_convert_from_ucs

};

#endif

#endif /* ICONV_TO_UCS_CES_UTF_16 || ICONV_FROM_UCS_CES_UTF_16 */