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

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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.  */

#ifndef _GCONV_INT_H

#define _GCONV_INT_H    1

#include "gconv.h"

#include <libc-symbols.h>

__BEGIN_DECLS

/* Type to represent search path.  */

struct path_elem

{

  const char *name;

  size_t len;

};

/* Variable with search path for `gconv' implementation.  */

extern struct path_elem *__gconv_path_elem;

/* Maximum length of a single path element.  */

extern size_t __gconv_max_path_elem_len;

/* Structure for alias definition.  Simply two strings.  */

struct gconv_alias

{

  char *fromname;

  char *toname;

};

/* How many character should be conveted in one call?  */

#define GCONV_NCHAR_GOAL        8160

/* Structure describing one loaded shared object.  This normally are

   objects to perform conversation but as a special case the db shared

   object is also handled.  */

struct __gconv_loaded_object

{

  /* Name of the object.  It must be the first structure element.  */

  const char *name;

  /* Reference counter for the db functionality.  If no conversion is

     needed we unload the db library.  */

  int counter;

  /* The handle for the shared object.  */

  void *handle;

  /* Pointer to the functions the module defines.  */

  __gconv_fct fct;

  __gconv_init_fct init_fct;

  __gconv_end_fct end_fct;

};

/* Description for an available conversion module.  */

struct gconv_module

{

  const char *from_string;

  const char *to_string;

  int cost_hi;

  int cost_lo;

  const char *module_name;

  struct gconv_module *left;    /* Prefix smaller.  */

  struct gconv_module *same;    /* List of entries with identical prefix.  */

  struct gconv_module *right;   /* Prefix larger.  */

};

/* Internal data structure to represent transliteration module.  */

struct trans_struct

{

  const char *name;

  struct trans_struct *next;

  const char **csnames;

  size_t ncsnames;

  __gconv_trans_fct trans_fct;

  __gconv_trans_context_fct trans_context_fct;

  __gconv_trans_init_fct trans_init_fct;

  __gconv_trans_end_fct trans_end_fct;

};

/* Flags for `gconv_open'.  */

enum

{

  GCONV_AVOID_NOCONV = 1 << 0

};

/* Global variables.  */

/* Database of alias names.  */

extern void *__gconv_alias_db;

/* Array with available modules.  */

extern size_t __gconv_nmodules;

extern struct gconv_module *__gconv_modules_db;

/* Value of the GCONV_PATH environment variable.  */

extern const char *__gconv_path_envvar;

/* The gconv functions expects the name to be in upper case and complete,

   including the trailing slashes if necessary.  */

#define norm_add_slashes(str,suffix) \

  ({                                                                          \

    const char *cp = (str);                                                   \

    char *result;                                                             \

    char *tmp;                                                                \

    size_t cnt = 0;                                                            \

    size_t suffix_len = (suffix) == NULL ? 0 : strlen (suffix);                \

                                                                              \

    while (*cp != '\0')                                                       \

      if (*cp++ == '/')                                                       \

        ++cnt;                                                                \

                                                                              \

    tmp = result = alloca (cp - (str) + 3 + suffix_len);                      \

    cp = (str);                                                               \

    while (*cp != '\0')                                                       \

      *tmp++ = __toupper_l (*cp++, &_nl_C_locobj);                            \

    if (cnt < 2)                                                              \

      {                                                                       \

        *tmp++ = '/';                                                         \

        if (cnt < 1)                                                          \

          {                                                                   \

            *tmp++ = '/';                                                     \

            if (suffix != NULL)                                               \

            {                                                                 \

              tmp = memcpy (tmp, suffix, suffix_len);                         \

              tmp += suffix_len;                                              \

            }                                                                 \

          }                                                                   \

      }                                                                       \

    *tmp = '\0';                                                              \

    result;                                                                   \

  })

/* Return in *HANDLE decriptor for transformation from FROMSET to TOSET.  */

extern int __gconv_open (const char *toset, const char *fromset,

                         __gconv_t *handle, int flags)

     internal_function;

/* Free resources associated with transformation descriptor CD.  */

extern int __gconv_close (__gconv_t cd)

     internal_function;

/* Transform at most *INBYTESLEFT bytes from buffer starting at *INBUF

   according to rules described by CD and place up to *OUTBYTESLEFT

   bytes in buffer starting at *OUTBUF.  Return number of non-identical

   conversions in *IRREVERSIBLE if this pointer is not null.  */

extern int __gconv (__gconv_t cd, const unsigned char **inbuf,

                    const unsigned char *inbufend, unsigned char **outbuf,

                    unsigned char *outbufend, size_t *irreversible)

     internal_function;

/* Return in *HANDLE a pointer to an array with *NSTEPS elements describing

   the single steps necessary for transformation from FROMSET to TOSET.  */

extern int __gconv_find_transform (const char *toset, const char *fromset,

                                   struct __gconv_step **handle,

                                   size_t *nsteps, int flags)

     internal_function;

/* Search for transformation in cache data.  */

extern int __gconv_lookup_cache (const char *toset, const char *fromset,

                                 struct __gconv_step **handle, size_t *nsteps,

                                 int flags)

     internal_function;

/* Compare the two name for whether they are after alias expansion the

   same.  This function uses the cache and fails if none is

   loaded.  */

extern int __gconv_compare_alias_cache (const char *name1, const char *name2,

                                        int *result) internal_function;

/* Free data associated with a step's structure.  */

extern void __gconv_release_step (struct __gconv_step *step)

     internal_function;

/* Read all the configuration data and cache it.  */

extern void __gconv_read_conf (void);

/* Try to read module cache file.  */

extern int __gconv_load_cache (void) internal_function;

/* Determine the directories we are looking in.  */

extern void __gconv_get_path (void);

/* Comparison function to search alias.  */

extern int __gconv_alias_compare (const void *p1, const void *p2);

/* Clear reference to transformation step implementations which might

   cause the code to be unloaded.  */

extern int __gconv_close_transform (struct __gconv_step *steps,

                                    size_t nsteps)

     internal_function;

/* Free all resources allocated for the transformation record when

   using the cache.  */

extern void __gconv_release_cache (struct __gconv_step *steps, size_t nsteps)

     internal_function;

/* Load shared object named by NAME.  If already loaded increment reference

   count.  */

extern struct __gconv_loaded_object *__gconv_find_shlib (const char *name)

     internal_function;

/* Release shared object.  If no further reference is available unload

   the object.  */

extern void __gconv_release_shlib (struct __gconv_loaded_object *handle)

     internal_function;

/* Fill STEP with information about builtin module with NAME.  */

extern void __gconv_get_builtin_trans (const char *name,

                                       struct __gconv_step *step)

     internal_function;

/* Try to load transliteration step module.  */

extern int __gconv_translit_find (struct trans_struct *trans)

     internal_function;

/* Transliteration using the locale's data.  */

extern int __gconv_transliterate (struct __gconv_step *step,

                                  struct __gconv_step_data *step_data,

                                  void *trans_data,

                                  __const unsigned char *inbufstart,

                                  __const unsigned char **inbufp,

                                  __const unsigned char *inbufend,

                                  unsigned char **outbufstart,

                                  size_t *irreversible);

/* Builtin transformations.  */

#ifdef _LIBC

# define __BUILTIN_TRANS(Name) \

  extern int Name (struct __gconv_step *step,                                 \

                   struct __gconv_step_data *data,                            \

                   const unsigned char **inbuf,                               \

                   const unsigned char *inbufend,                             \

                   unsigned char **outbufstart, size_t *irreversible,         \

                   int do_flush, int consume_incomplete)

__BUILTIN_TRANS (__gconv_transform_ascii_internal);

__BUILTIN_TRANS (__gconv_transform_internal_ascii);

__BUILTIN_TRANS (__gconv_transform_utf8_internal);

__BUILTIN_TRANS (__gconv_transform_internal_utf8);

__BUILTIN_TRANS (__gconv_transform_ucs2_internal);

__BUILTIN_TRANS (__gconv_transform_internal_ucs2);

__BUILTIN_TRANS (__gconv_transform_ucs2reverse_internal);

__BUILTIN_TRANS (__gconv_transform_internal_ucs2reverse);

__BUILTIN_TRANS (__gconv_transform_internal_ucs4);

__BUILTIN_TRANS (__gconv_transform_ucs4_internal);

__BUILTIN_TRANS (__gconv_transform_internal_ucs4le);

__BUILTIN_TRANS (__gconv_transform_ucs4le_internal);

__BUILTIN_TRANS (__gconv_transform_internal_utf16);

__BUILTIN_TRANS (__gconv_transform_utf16_internal);

# undef __BUITLIN_TRANS

#endif

__END_DECLS

#endif /* gconv_int.h */