iconv/gconv_int.h

   1 /* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _GCONV_INT_H
  21 #define _GCONV_INT_H    1
  22
  23 #include "gconv.h"
  24 #include <regex.h>
  25
  26 __BEGIN_DECLS
  27
  28
  29 /* Structure for alias definition.  Simply to strings.  */
  30 struct gconv_alias
  31 {
  32   const char *fromname;
  33   const char *toname;
  34 };
  35
  36
  37 /* How many character should be conveted in one call?  */
  38 #define GCONV_NCHAR_GOAL        8160
  39
  40
  41 /* Structure describing one loaded shared object.  This normally are
  42    objects to perform conversation but as a special case the db shared
  43    object is also handled.  */
  44 struct gconv_loaded_object
  45 {
  46   /* Name of the object.  */
  47   const char *name;
  48
  49   /* Reference counter for the db functionality.  If no conversion is
  50      needed we unload the db library.  */
  51   int counter;
  52
  53   /* The handle for the shared object.  */
  54   struct link_map *handle;
  55
  56   /* Pointer to the functions the module defines.  */
  57   gconv_fct fct;
  58   gconv_init_fct init_fct;
  59   gconv_end_fct end_fct;
  60 };
  61
  62
  63 /* Description for an available conversion module.  */
  64 struct gconv_module
  65 {
  66   const char *from_pattern;
  67   const char *from_constpfx;
  68   size_t from_constpfx_len;
  69   const regex_t *from_regex;
  70   regex_t from_regex_mem;
  71
  72   const char *to_string;
  73
  74   int cost_hi;
  75   int cost_lo;
  76
  77   const char *module_name;
  78
  79   struct gconv_module *left;    /* Prefix smaller.  */
  80   struct gconv_module *same;    /* List of entries with identical prefix.  */
  81   struct gconv_module *matching;/* Next node with more specific prefix.  */
  82   struct gconv_module *right;   /* Prefix larger.  */
  83 };
  84
  85
  86 /* Global variables.  */
  87
  88 /* Database of alias names.  */
  89 extern void *__gconv_alias_db;
  90
  91 /* Array with available modules.  */
  92 extern size_t __gconv_nmodules;
  93 extern struct gconv_module *__gconv_modules_db;
  94
  95
  96 /* Return in *HANDLE decriptor for transformation from FROMSET to TOSET.  */
  97 extern int __gconv_open (const char *__toset, const char *__fromset,
  98                          gconv_t *__handle)
  99      internal_function;
 100
 101 /* Free resources associated with transformation descriptor CD.  */
 102 extern int __gconv_close (gconv_t cd)
 103      internal_function;
 104
 105 /* Transform at most *INBYTESLEFT bytes from buffer starting at *INBUF
 106    according to rules described by CD and place up to *OUTBYTESLEFT
 107    bytes in buffer starting at *OUTBUF.  Return number of written
 108    characters in *CONVERTED if this pointer is not null.  */
 109 extern int __gconv (gconv_t __cd, const char **__inbuf, const char *inbufend,
 110                     char **__outbuf, char *outbufend, size_t *converted)
 111      internal_function;
 112
 113 /* Return in *HANDLE a pointer to an array with *NSTEPS elements describing
 114    the single steps necessary for transformation from FROMSET to TOSET.  */
 115 extern int __gconv_find_transform (const char *__toset, const char *__fromset,
 116                                    struct gconv_step **__handle,
 117                                    size_t *__nsteps)
 118      internal_function;
 119
 120 /* Read all the configuration data and cache it.  */
 121 extern void __gconv_read_conf (void);
 122
 123 /* Comparison function to search alias.  */
 124 extern int __gconv_alias_compare (const void *__p1, const void *__p2);
 125
 126 /* Clear reference to transformation step implementations which might
 127    cause the code to be unloaded.  */
 128 extern int __gconv_close_transform (struct gconv_step *__steps,
 129                                     size_t __nsteps)
 130      internal_function;
 131
 132 /* Load shared object named by NAME.  If already loaded increment reference
 133    count.  */
 134 extern struct gconv_loaded_object *__gconv_find_shlib (const char *__name)
 135      internal_function;
 136
 137 /* Find function named NAME in shared object referenced by HANDLE.  */
 138 void *__gconv_find_func (void *handle, const char *name)
 139      internal_function;
 140
 141 /* Release shared object.  If no further reference is available unload
 142    the object.  */
 143 extern int __gconv_release_shlib (struct gconv_loaded_object *__handle)
 144      internal_function;
 145
 146 /* Fill STEP with information about builtin module with NAME.  */
 147 extern void __gconv_get_builtin_trans (const char *__name,
 148                                        struct gconv_step *__step)
 149      internal_function;
 150
 151
 152
 153 /* Builtin transformations.  */
 154 #ifdef _LIBC
 155 # define __BUILTIN_TRANS(Name) \
 156   extern int Name (struct gconv_step *__step, struct gconv_step_data *__data, \
 157                    const char **__inbuf, const char *__inbufend,              \
 158                    size_t *__written, int __do_flush)
 159
 160 __BUILTIN_TRANS (__gconv_transform_ascii_internal);
 161 __BUILTIN_TRANS (__gconv_transform_internal_ascii);
 162 __BUILTIN_TRANS (__gconv_transform_utf8_internal);
 163 __BUILTIN_TRANS (__gconv_transform_internal_utf8);
 164 __BUILTIN_TRANS (__gconv_transform_ucs2_internal);
 165 __BUILTIN_TRANS (__gconv_transform_internal_ucs2);
 166 __BUILTIN_TRANS (__gconv_transform_ucs2little_internal);
 167 __BUILTIN_TRANS (__gconv_transform_internal_ucs2little);
 168 __BUILTIN_TRANS (__gconv_transform_internal_ucs4);
 169 # undef __BUITLIN_TRANS
 170
 171 #endif
 172
 173 __END_DECLS
 174
 175 #endif /* gconv_int.h */