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/* Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

/* This header provides no interface for a user to the internals of

   the gconv implementation in the libc.  Therefore there is no use

   for these definitions beside for writing additional gconv modules.  */

#ifndef _GCONV_H

#define _GCONV_H        1

#include <features.h>

#define __need_mbstate_t

#include <wchar.h>

#define __need_size_t

#define __need_wchar_t

#include <stddef.h>

/* ISO 10646 value used to signal invalid value.  */

#define __UNKNOWN_10646_CHAR    ((wchar_t) 0xfffd)

/* Error codes for gconv functions.  */

enum

{

  __GCONV_OK = 0,

  __GCONV_NOCONV,

  __GCONV_NODB,

  __GCONV_NOMEM,

  __GCONV_EMPTY_INPUT,

  __GCONV_FULL_OUTPUT,

  __GCONV_ILLEGAL_INPUT,

  __GCONV_INCOMPLETE_INPUT,

  __GCONV_ILLEGAL_DESCRIPTOR,

  __GCONV_INTERNAL_ERROR

};

/* Flags the `__gconv_open' function can set.  */

enum

{

  __GCONV_IS_LAST = 0x0001,

  __GCONV_IGNORE_ERRORS = 0x0002

};

/* Forward declarations.  */

struct __gconv_step;

struct __gconv_step_data;

struct __gconv_loaded_object;

struct __gconv_trans_data;

/* Type of a conversion function.  */

typedef int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *,

                            __const unsigned char **, __const unsigned char *,

                            unsigned char **, size_t *, int, int);

/* Constructor and destructor for local data for conversion step.  */

typedef int (*__gconv_init_fct) (struct __gconv_step *);

typedef void (*__gconv_end_fct) (struct __gconv_step *);

/* Type of a transliteration/transscription function.  */

typedef int (*__gconv_trans_fct) (struct __gconv_step *,

                                  struct __gconv_step_data *, void *,

                                  __const unsigned char *,

                                  __const unsigned char **,

                                  __const unsigned char *, unsigned char **,

                                  size_t *);

/* Function to call to provide transliteration module with context.  */

typedef int (*__gconv_trans_context_fct) (void *, __const unsigned char *,

                                          __const unsigned char *,

                                          unsigned char *, unsigned char *);

/* Function to query module about supported encoded character sets.  */

typedef int (*__gconv_trans_query_fct) (__const char *, __const char ***,

                                        size_t *);

/* Constructor and destructor for local data for transliteration.  */

typedef int (*__gconv_trans_init_fct) (void **, const char *);

typedef void (*__gconv_trans_end_fct) (void *);

struct __gconv_trans_data

{

  /* Transliteration/Transscription function.  */

  __gconv_trans_fct __trans_fct;

  __gconv_trans_context_fct __trans_context_fct;

  __gconv_trans_end_fct __trans_end_fct;

  void *__data;

  struct __gconv_trans_data *__next;

};

/* Description of a conversion step.  */

struct __gconv_step

{

  struct __gconv_loaded_object *__shlib_handle;

  __const char *__modname;

  int __counter;

  char *__from_name;

  char *__to_name;

  __gconv_fct __fct;

  __gconv_init_fct __init_fct;

  __gconv_end_fct __end_fct;

  /* Information about the number of bytes needed or produced in this

     step.  This helps optimizing the buffer sizes.  */

  int __min_needed_from;

  int __max_needed_from;

  int __min_needed_to;

  int __max_needed_to;

  /* Flag whether this is a stateful encoding or not.  */

  int __stateful;

  void *__data;         /* Pointer to step-local data.  */

};

/* Additional data for steps in use of conversion descriptor.  This is

   allocated by the `init' function.  */

struct __gconv_step_data

{

  unsigned char *__outbuf;    /* Output buffer for this step.  */

  unsigned char *__outbufend; /* Address of first byte after the output

                                 buffer.  */

  /* Is this the last module in the chain.  */

  int __flags;

  /* Counter for number of invocations of the module function for this

     descriptor.  */

  int __invocation_counter;

  /* Flag whether this is an internal use of the module (in the mb*towc*

     and wc*tomb* functions) or regular with iconv(3).  */

  int __internal_use;

  mbstate_t *__statep;

  mbstate_t __state;    /* This element must not be used directly by

                           any module; always use STATEP!  */

  /* Transliteration information.  */

  struct __gconv_trans_data *__trans;

};

/* Combine conversion step description with data.  */

typedef struct __gconv_info

{

  size_t __nsteps;

  struct __gconv_step *__steps;

  __extension__ struct __gconv_step_data __data __flexarr;

} *__gconv_t;

#endif /* gconv.h */