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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_UCS_2) \

 || defined (ICONV_FROM_UCS_CES_UCS_2)

#include <_ansi.h>

#include <reent.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

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

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

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

/*

 * BOM isn't supported. UCS-2 is Big Endian. Bad codes are rejected.

 * Bad codes: 0xFFFF, 0xFFFE, 0xD800-0xDFFF.

 */

#define UCS_2_BIG_ENDIAN     0

#define UCS_2_LITTLE_ENDIAN  1

#define UCS_2   "ucs_2"

#define UCS_2BE "ucs_2be"

#define UCS_2LE "ucs_2le"

static _VOID_PTR

_DEFUN(ucs_2_init, (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, UCS_2LE) == 0)

    *data = UCS_2_LITTLE_ENDIAN;

  else

    *data = UCS_2_BIG_ENDIAN;

  return (_VOID_PTR)data;

}

static size_t

_DEFUN(ucs_2_close, (rptr, data),

                    struct _reent *rptr _AND

                    _VOID_PTR data)

{

  _free_r (rptr, data);

  return 0;

}

#if defined (ICONV_FROM_UCS_CES_UCS_2)

static size_t

_DEFUN(ucs_2_convert_from_ucs, (data, in, outbuf, outbytesleft),

                               _VOID_PTR data         _AND

                               ucs4_t in              _AND

                               unsigned char **outbuf _AND

                               size_t *outbytesleft)

{

  if ((in  >= 0x0000D800 && in <= 0x0000DFFF) /* Surrogate character */

      || in >= 0x0000FFFE)

    return (size_t)ICONV_CES_INVALID_CHARACTER;

  if (*outbytesleft < sizeof (ucs2_t))

    return (size_t)ICONV_CES_NOSPACE;

  if (*((int *)data) == UCS_2_BIG_ENDIAN)

    *((ucs2_t *)(*outbuf)) = ICONV_HTOBES ((ucs2_t)in);

  else

    *((ucs2_t *)(*outbuf)) = ICONV_HTOLES ((ucs2_t)in);

  *outbuf += sizeof (ucs2_t);

  *outbytesleft -= sizeof (ucs2_t);

  return sizeof (ucs2_t);

}

#endif /* ICONV_FROM_UCS_CES_UCS_2 */

#if defined (ICONV_TO_UCS_CES_UCS_2)

static ucs4_t

_DEFUN(ucs_2_convert_to_ucs, (data, inbuf, inbytesleft),

                             _VOID_PTR data               _AND

                             _CONST unsigned char **inbuf _AND

                             size_t *inbytesleft)

{

  ucs4_t res;

  if (*inbytesleft < sizeof (ucs2_t))

    return (ucs4_t)ICONV_CES_BAD_SEQUENCE;

  if (*((int *)data) == UCS_2_BIG_ENDIAN)

    res = (ucs4_t)ICONV_BETOHS (*((ucs2_t *)(*inbuf)));

  else

    res = (ucs4_t)ICONV_LETOHS (*((ucs2_t *)(*inbuf)));

  if ((res  >= 0x0000D800 && res <= 0x0000DFFF) /* Surrogate character */

      || res >= 0x0000FFFE)

    return (ucs4_t)ICONV_CES_INVALID_CHARACTER;

  *inbytesleft -= sizeof (ucs2_t);

  *inbuf += sizeof (ucs2_t);

  return res;

}

#endif /* ICONV_TO_UCS_CES_UCS_2 */

static int

_DEFUN(ucs_2_get_mb_cur_max, (data),

                             _VOID_PTR data)

{

  return 2;

}

#if defined (ICONV_TO_UCS_CES_UCS_2)

_CONST iconv_to_ucs_ces_handlers_t

_iconv_to_ucs_ces_handlers_ucs_2 =

{

  ucs_2_init,

  ucs_2_close,

  ucs_2_get_mb_cur_max,

  NULL,

  NULL,

  NULL,

  ucs_2_convert_to_ucs

};

#endif

#if defined (ICONV_FROM_UCS_CES_UCS_2)

_CONST iconv_from_ucs_ces_handlers_t

_iconv_from_ucs_ces_handlers_ucs_2 =

{

  ucs_2_init,

  ucs_2_close,

  ucs_2_get_mb_cur_max,

  NULL,

  NULL,

  NULL,

  ucs_2_convert_from_ucs

};

#endif

#endif /* ICONV_TO_UCS_CES_UCS_2 || ICONV_FROM_UCS_CES_UCS_2 */