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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_UCS_CONVERSION_H__

#define __ICONV_UCS_CONVERSION_H__

#include <_ansi.h>

#include <reent.h>

#include <sys/types.h>

#include <wchar.h>

#include "local.h"

/* No enough space in output buffer */

#define ICONV_CES_NOSPACE 0

/* Invalid input character */

#define ICONV_CES_INVALID_CHARACTER -1

/* No corespondent character in destination encoding */

#define ICONV_CES_BAD_SEQUENCE -2

/* All unknown characters are marked by this code */

#define DEFAULT_CHARACTER 0x3f /* ASCII '?' */

/*

 * iconv_to_ucs_ces_handlers_t - "to UCS" CES converter handlers.

 *

 * Structure contains function pointers which should be provided by

 * "to_ucs" CES converter.

 *

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

 */

typedef struct

{

  /*

   * init - initialize CES converter.

   *

   * PARAMETERS:

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

   *   _CONST char *encoding - encoding name.

   *

   * DESCRIPTION:

   *  Initializes CES converter. CES converter may deal with a series of

   *  encodings, such as Table or EUC CES converters. 'encoding' parameter

   *  indicates which encoding CES converter should use.

   *

   * RETURN:

   *   Returns CES-specific data pointer if success. In case of error returns

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

   */

  _VOID_PTR _EXFNPTR(init, (struct _reent *rptr,

                          _CONST char *encoding));

  /*

   * close - close CES converter.

   *

   * PARAMETERS:

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

   *   _VOID_PTR data      - CES converter-specific data.

   *

   * DESCRIPTION:

   *     Preforms CES converter closing.   *

   * RETURN:

   *   Returns (size_t)0 if success. In case of error returns (size_t)-1 and

   *   sets current thread's/process's errno.

   */

  size_t _EXFNPTR(close, (struct _reent *rptr,

                        _VOID_PTR data));

  /*

   * get_mb_cur_max - get maximum character length in bytes.

   *

   * PARAMETERS:

   *   _VOID_PTR data     - conversion-specific data;

   *

   * DESCRIPTION:

   *   Returns encoding's maximum character length.

   */

  int _EXFNPTR(get_mb_cur_max, (_VOID_PTR data));

  /*

   * get_state - get current shift state.

   *

   * PARAMETERS:

   *   _VOID_PTR data   - conversion-specific data;

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

   *

   * DESCRIPTION:

   *   Returns encoding's current shift sequence.

   */

  _VOID _EXFNPTR(get_state, (_VOID_PTR data,

                           mbstate_t *state));

  /*

   * set_state - set shift state.

   *

   * PARAMETERS:

   *   _VOID_PTR data   - conversion-specific data;

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

   *

   * DESCRIPTION:

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

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

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

   */

  int _EXFNPTR(set_state, (_VOID_PTR data,

                         mbstate_t *state));

  /*

   * is_stateful - is encoding stateful state.

   *

   * PARAMETERS:

   *   _VOID_PTR data   - conversion-specific data;

   *

   * DESCRIPTION:

   *   Returns 0 if encoding is stateless, else returns 1.

   */

  int _EXFNPTR(is_stateful, (_VOID_PTR data));

  /*

   * convert_to_ucs - convert character to UCS.

   *

   * PARAMETERS:

   *   _VOID_PTR data               - CES converter-specific data;

   *   _CONST unsigned char **inbuf - buffer with input character byte sequence;

   *   size_t *inbytesleft          - output buffer bytes count.

   *

   * DESCRIPTION:

   *   Converts input characters into UCS encoding. 'inbuf' is

   *   incremented accordingly. 'bytesleft' is decremented accordingly. Should

   *   be provided by correspondent CES module.

   *

   * RETURN:

   *   Returns resulting UCS code if success. If input character is invalid,

   *   returns ICONV_CES_INVALID_CHARACTER. If invalid or incomplete bytes

   *   sequence was met, returns ICONV_CES_BAD_SEQUENCE.

   */

  ucs4_t _EXFNPTR(convert_to_ucs, (_VOID_PTR data,

                                 _CONST unsigned char **inbuf,

                                 size_t *inbytesleft));

} iconv_to_ucs_ces_handlers_t;

/*

 * iconv_from_ucs_ces_handlers_t - "from UCS" CES converter handlers.

 *

 * Structure contains function pointers which should be provided by

 * "from_ucs" CES converter.

 *

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

 */

typedef struct

{

  /* Same as in iconv_to_ucs_ces_handlers_t */

  _VOID_PTR _EXFNPTR(init, (struct _reent *rptr,

                          _CONST char *encoding));

  /* Same as in iconv_to_ucs_ces_handlers_t */

  size_t _EXFNPTR(close, (struct _reent *rptr,

                        _VOID_PTR data));

  /* Same as in iconv_to_ucs_ces_handlers_t */

  int _EXFNPTR(get_mb_cur_max, (_VOID_PTR data));

  /* Same as in iconv_to_ucs_ces_handlers_t */

  _VOID _EXFNPTR(get_state, (_VOID_PTR data,

                           mbstate_t *state));

  /* Same as in iconv_to_ucs_ces_handlers_t */

  int _EXFNPTR(set_state, (_VOID_PTR data,

                         mbstate_t *state));

  /* Same as in iconv_to_ucs_ces_handlers_t */

  int _EXFNPTR(is_stateful, (_VOID_PTR data));

  /*

   * convert_from_ucs - convert UCS character to destination encoding.

   *

   * PARAMETERS:

   *   _VOID_PTR data         - CES converter-specific data;

   *   ucs4_t in              - input UCS-4 character;

   *   unsigned char **outbuf - output buffer for the result;

   *   size_t *outbytesleft   - output buffer bytes count.

   *

   * DESCRIPTION:

   *   Converts input UCS characters to destination encoding and stores result

   *   in 'outbuf' if there is sufficient free space present. 'outbuf' is

   *   incremented accordingly. 'outbytesleft' is decremented accordingly. Should

   *   be provided by correspondent CES module.

   *   Output buffer always has at least 1 byte.

   *

   * RETURN:

   *   Returns number of bytes that was written into output buffer if success.

   *   If there is no enough space in output buffer, returns ICONV_CES_NOSPACE.

   *   If there is no corresponding character in destination encoding, returns

   *   ICONV_CES_INVALID_CHARACTER.

   */

  size_t _EXFNPTR(convert_from_ucs, (_VOID_PTR data,

                                   ucs4_t in,

                                   unsigned char **outbuf,

                                   size_t *outbytesleft));

} iconv_from_ucs_ces_handlers_t;

/*

 * iconv_to_ucs_ces_desc_t - "to UCS" CES converter definition structure for

 * usage in iconv_ucs_conversion_t conversion description structure.

 *

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

 */

typedef struct

{

  /* CES converter handlers */

  _CONST iconv_to_ucs_ces_handlers_t *handlers;

  /* "to_ucs" CES converter-specific data. */

  _VOID_PTR data;

} iconv_to_ucs_ces_desc_t;

/*

 * iconv_from_ucs_ces_desc_t - "from UCS" CES converter definition structure for

 * usage in iconv_ucs_conversion_t conversion description structure.

 *

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

 */

typedef struct

{

  /* CES converter handlers */

  _CONST iconv_from_ucs_ces_handlers_t *handlers;

  /* "from_ucs" CES converter-specific data. */

  _VOID_PTR data;

} iconv_from_ucs_ces_desc_t;

/*

 * iconv_ucs_conversion_t - UCS-based conversion definition structure.

 *

 * Defines special type of conversion where every character is first

 * converted into UCS-4 (UCS-2 for table-driven), and after this the

 * resulting UCS character is converted to destination encoding.

 * UCS-based conversion is composed of two *converters*, defined by

 * iconv_ces_t structure. The iconv_ucs_conversion_t object is referred

 * from iconv_conversion_t object using 'data' field.

 *

 * Structure contains two objects - 'to_ucs' and 'from_ucs' which define

 * "source encoding to UCS" and "UCS to destination encoding" converters.

 *

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

 */

typedef struct

{

  /* Source encoding -> CES converter. */

  iconv_to_ucs_ces_desc_t to_ucs;

  /* UCS -> destination encoding CES converter. */

  iconv_from_ucs_ces_desc_t from_ucs;

} iconv_ucs_conversion_t;

/*

 * iconv_to_ucs_ces_t - defines "to UCS" CES converter.

 *

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

 */

typedef struct

{

  /*

   * An array of encodings names, supported by CES converter.

   * The end of array should be marked by NULL pointer.

   */

  _CONST char **names;

  /* CES converter description structure */

  _CONST iconv_to_ucs_ces_handlers_t *handlers;

} iconv_to_ucs_ces_t;

/*

 * iconv_from_ucs_ces_t - defines "from UCS" CES converter.

 *

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

 */

typedef struct

{

  /*

   * An array of encodings names, supported by CES converter.

   * The end of array should be marked by NULL pointer.

   */

  _CONST char **names;

  /* CES converter description structure */

  _CONST iconv_from_ucs_ces_handlers_t *handlers;

} iconv_from_ucs_ces_t;

/* List of "to UCS" linked-in CES converters. */

extern _CONST iconv_to_ucs_ces_t

_iconv_to_ucs_ces[];

/* List of "from UCS" linked-in CES converters. */

extern _CONST iconv_from_ucs_ces_t

_iconv_from_ucs_ces[];

#endif /* !__ICONV_UCS_CONVERSION_H__ */