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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.

 */

#ifndef __ICONV_CONVERSION_H__

#define __ICONV_CONVERSION_H__

#include <_ansi.h>

#include <reent.h>

#include <sys/types.h>

#include <wchar.h>

/* Bits for 'flags' parameter of 'convert' call */

#define ICONV_DONT_SAVE_BIT 1

#define ICONV_FAIL_BIT      2

/*

 * iconv_conversion_handlers_t - keeps iconv conversion handlers.

 *

 * Keeps 6 interface function handlers:

 * open(), close(), convert(), get_mb_cur_max(), get_state(), set_state(),

 * get_mb_cur_max() and is_stateful(). Last 5 interface functions are needed to

 * support locale subsystem.

 *

 * ============================================================================

 */

typedef struct

{

  /*

   * open - open and initialize conversion.

   *

   * PARAMETERS:

   *   struct _reent *rptr - reent structure of current thread/process;

   *   _CONST char *to     - output encoding's normalized name;

   *   _CONST char *from   - input encoding's normalized name.

   *

   * DESCRIPTION:

   *   This function is called from iconv_open() to open conversion. Returns

   *   a pointer to conversion-specific data.

   *

   * RETURN:

   *   Pointer to conversion-specific data if success. In case of error

   *   returns NULL and sets current thread's/process's errno.

   */

  _VOID_PTR _EXFNPTR(open, (struct _reent *rptr,

                          _CONST char *to,

                          _CONST char *from));

  /*

   * close - close conversion.

   *

   * PARAMETRS:

   *   struct _reent *rptr - reent structure of current thread/process;

   *   _VOID_PTR data      - conversion-specific data.

   *

   * DESCRIPTION:

   *   This function is called from iconv_close() to close conversion.

   *

   * RETURN:

   *   When successful, returns (size_t)0. In case of error, sets current

   *   thread's/process's errno and returns (size_t)-1 (same as iconv_open()).

   */

  size_t _EXFNPTR(close, (struct _reent *rptr,

                        _VOID_PTR data));

  /* convert - perform encoding conversion.

   *

   * PARAMETERS:

   *   struct _reent *rptr - reent structure of current thread/process.

   *   _VOID_PTR data      - conversion-specific data;

   *   _CONST unsigned char **inbuf - input data buffer;

   *   size_t *inbytesleft          - input buffer's length;

   *   unsigned char **outbuf       - output data buffer;

   *   size_t *outbytesleft         - output buffer free space;

   *   int flags                    - conversion options.

   *

   * DESCRIPTION:

   *   This function is called from iconv() to perform conversion and, if 'flags'

   *   is 0, behaves similarly to iconv(). 'inbuf', 'inbytesleft', 'outbuf' and

   *   'outbytesleft' are same as in case of iconv() function.

   *

   *   When flags & 1 isn't 0, 'outbuf' value is ignored and result isn't saved.

   *   Another conversion aspects aren't changed.

   *

   *   When flags & 2 isn't 0, function changes it's behavior in situations,

   *   when there is no character in "to" encoding that corresponds to valid

   *   character from "from" encoding. iconv() specification stands to perform

   *   implimentation-spacific default conversion. If flag & 2 isn't 0,

   *   function generates error.

   *

   * RETURN:

   *   Returns the number of characters converted in a non-reversible way.

   *   Reversible conversions are not counted. In case of error, sets current

   *   thread's/process's errno and returns (size_t)-1 (same as iconv()).

   */

  size_t _EXFNPTR(convert, (struct _reent *rptr,

                           _VOID_PTR data,

                           _CONST unsigned char **inbuf,

                           size_t *inbytesleft,

                           unsigned char **outbuf,

                           size_t *outbytesleft,

                           int flags));

  /*

   * get_state - get current shift state.

   *

   * PARAMETERS:

   *   _VOID_PTR data   - conversion-specific data;

   *   mbstate_t *state - mbstate_t object where shift state will be written;

   *   int direction      - 0-"from", 1-"to".

   *

   * DESCRIPTION:

   *   Returns encoding's current shift sequence.

   *   If 'direction' is 0, "from" encoding is tested, else

   *   "to" encoding is tested.

   */

  _VOID _EXFNPTR(get_state, (_VOID_PTR data,

                           mbstate_t *state,

                           int direction));

  /*

   * set_state - set shift state.

   *

   * PARAMETERS:

   *   _VOID_PTR data   - conversion-specific data;

   *   mbstate_t *state - mbstate_t object to which shift state will be set.

   *   int direction     - 0-"from", 1-"to".

   *

   * DESCRIPTION:

   *   Sets encoding's current shift state to 'state'. if 'state'

   *   object is zero-object - reset current shift state.

   *   If 'direction' is 0, "from" encoding is set, else

   *   "to" encoding is set.

   *   Returns 0 if '*state' object has right format, -1 else.

   */

  int _EXFNPTR(set_state, (_VOID_PTR data,

                         mbstate_t *state,

                         int direction));

  /*

   * get_mb_cur_max - get maximum character length in bytes.

   *

   * PARAMETERS:

   *   _VOID_PTR data     - conversion-specific data;

   *   int direction      - 0-"from", 1-"to".

   *

   * DESCRIPTION:

   *   Returns encoding's maximum character length.

   *   If 'direction' is 0, "from" encoding is tested, else

   *   "to" encoding is tested.

   */

  int _EXFNPTR(get_mb_cur_max, (_VOID_PTR data,

                              int direction));

  /*

   * is_stateful - is encoding stateful or stateless.

   *

   * PARAMETERS:

   *   _VOID_PTR data - conversion-specific data;

   *   int direction  - 0-"from", 1-"to".

   *

   * DESCRIPTION:

   *   Returns 0 if encoding is stateless and 1 if stateful.

   *   If 'direction' is 0, "from" encoding is tested, else

   *   "to" encoding is tested.

   */

  int _EXFNPTR(is_stateful, (_VOID_PTR data,

                           int direction));

} iconv_conversion_handlers_t;

/*

 * iconv_conversion_t - iconv conversion definition structure.

 *

 * ============================================================================

 */

typedef struct

{

  /* Iconv conversion handlers. */

  _CONST iconv_conversion_handlers_t *handlers;

  /*

   * Conversion-specific data (e.g., points to iconv_ucs_conversion_t

   * object if UCS-based conversion is used).

   */

  _VOID_PTR data;

} iconv_conversion_t;

/* UCS-based conversion handlers */

extern _CONST iconv_conversion_handlers_t

_iconv_ucs_conversion_handlers;

/* Null conversion handlers */

extern _CONST iconv_conversion_handlers_t

_iconv_null_conversion_handlers;

#endif /* !__ICONV_CONVERSION_H__ */