iconv/gconv_int.h

   1 /* Copyright (C) 1997, 1998, 1999, 2000 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
  25 __BEGIN_DECLS
  26
  27
  28 /* Type to represent search path.  */
  29 struct path_elem
  30 {
  31   const char *name;
  32   size_t len;
  33 };
  34
  35 /* Variable with search path for `gconv' implementation.  */
  36 extern struct path_elem *__gconv_path_elem;
  37 /* Maximum length of a single path element.  */
  38 extern size_t __gconv_max_path_elem_len;
  39
  40
  41 /* Structure for alias definition.  Simply to strings.  */
  42 struct gconv_alias
  43 {
  44   char *fromname;
  45   char *toname;
  46 };
  47
  48
  49 /* How many character should be conveted in one call?  */
  50 #define GCONV_NCHAR_GOAL        8160
  51
  52
  53 /* Structure describing one loaded shared object.  This normally are
  54    objects to perform conversation but as a special case the db shared
  55    object is also handled.  */
  56 struct __gconv_loaded_object
  57 {
  58   /* Name of the object.  It must be the first structure element.  */
  59   const char *name;
  60
  61   /* Reference counter for the db functionality.  If no conversion is
  62      needed we unload the db library.  */
  63   int counter;
  64
  65   /* The handle for the shared object.  */
  66   void *handle;
  67
  68   /* Pointer to the functions the module defines.  */
  69   __gconv_fct fct;
  70   __gconv_init_fct init_fct;
  71   __gconv_end_fct end_fct;
  72 };
  73
  74
  75 /* Description for an available conversion module.  */
  76 struct gconv_module
  77 {
  78   const char *from_string;
  79   const char *to_string;
  80
  81   int cost_hi;
  82   int cost_lo;
  83
  84   const char *module_name;
  85
  86   struct gconv_module *left;    /* Prefix smaller.  */
  87   struct gconv_module *same;    /* List of entries with identical prefix.  */
  88   struct gconv_module *right;   /* Prefix larger.  */
  89 };
  90
  91
  92 /* Internal data structure to represent transliteration module.  */
  93 struct trans_struct
  94 {
  95   const char *name;
  96   struct trans_struct *next;
  97
  98   const char **csnames;
  99   size_t ncsnames;
 100   __gconv_trans_fct trans_fct;
 101   __gconv_trans_context_fct trans_context_fct;
 102   __gconv_trans_init_fct trans_init_fct;
 103   __gconv_trans_end_fct trans_end_fct;
 104 };
 105
 106
 107 /* Flags for `gconv_open'.  */
 108 enum
 109 {
 110   GCONV_AVOID_NOCONV = 1 << 0
 111 };
 112
 113
 114 /* Global variables.  */
 115
 116 /* Database of alias names.  */
 117 extern void *__gconv_alias_db;
 118
 119 /* Array with available modules.  */
 120 extern size_t __gconv_nmodules;
 121 extern struct gconv_module *__gconv_modules_db;
 122
 123
 124 /* The gconv functions expects the name to be in upper case and complete,
 125    including the trailing slashes if necessary.  */
 126 #define norm_add_slashes(str,suffix) \
 127   ({                                                                          \
 128     const char *cp = (str);                                                   \
 129     char *result;                                                             \
 130     char *tmp;                                                                \
 131     size_t cnt = 0;                                                           \
 132     size_t suffix_len = (suffix) == NULL ? 0 : strlen (suffix);               \
 133                                                                               \
 134     while (*cp != '\0')                                                       \
 135       if (*cp++ == '/')                                                       \
 136         ++cnt;                                                                \
 137                                                                               \
 138     tmp = result = alloca (cp - (str) + 3 + suffix_len);                      \
 139     cp = (str);                                                               \
 140     while (*cp != '\0')                                                       \
 141       *tmp++ = _toupper (*cp++);                                              \
 142     if (cnt < 2)                                                              \
 143       {                                                                       \
 144         *tmp++ = '/';                                                         \
 145         if (cnt < 1)                                                          \
 146           {                                                                   \
 147             *tmp++ = '/';                                                     \
 148             if (suffix != NULL)                                               \
 149               tmp = __mempcpy (tmp, suffix, suffix_len);                      \
 150           }                                                                   \
 151       }                                                                       \
 152     *tmp = '\0';                                                              \
 153     result;                                                                   \
 154   })
 155
 156
 157 /* Return in *HANDLE decriptor for transformation from FROMSET to TOSET.  */
 158 extern int __gconv_open (const char *toset, const char *fromset,
 159                          __gconv_t *handle, int flags)
 160      internal_function;
 161
 162 /* Free resources associated with transformation descriptor CD.  */
 163 extern int __gconv_close (__gconv_t cd)
 164      internal_function;
 165
 166 /* Transform at most *INBYTESLEFT bytes from buffer starting at *INBUF
 167    according to rules described by CD and place up to *OUTBYTESLEFT
 168    bytes in buffer starting at *OUTBUF.  Return number of non-identical
 169    conversions in *IRREVERSIBLE if this pointer is not null.  */
 170 extern int __gconv (__gconv_t cd, const unsigned char **inbuf,
 171                     const unsigned char *inbufend, unsigned char **outbuf,
 172                     unsigned char *outbufend, size_t *irreversible)
 173      internal_function;
 174
 175 /* Return in *HANDLE a pointer to an array with *NSTEPS elements describing
 176    the single steps necessary for transformation from FROMSET to TOSET.  */
 177 extern int __gconv_find_transform (const char *toset, const char *fromset,
 178                                    struct __gconv_step **handle,
 179                                    size_t *nsteps, int flags)
 180      internal_function;
 181
 182 /* Read all the configuration data and cache it.  */
 183 extern void __gconv_read_conf (void);
 184
 185 /* Determine the directories we are looking in.  */
 186 extern void __gconv_get_path (void);
 187
 188 /* Comparison function to search alias.  */
 189 extern int __gconv_alias_compare (const void *p1, const void *p2);
 190
 191 /* Clear reference to transformation step implementations which might
 192    cause the code to be unloaded.  */
 193 extern int __gconv_close_transform (struct __gconv_step *steps,
 194                                     size_t nsteps)
 195      internal_function;
 196
 197 /* Load shared object named by NAME.  If already loaded increment reference
 198    count.  */
 199 extern struct __gconv_loaded_object *__gconv_find_shlib (const char *name)
 200      internal_function;
 201
 202 /* Release shared object.  If no further reference is available unload
 203    the object.  */
 204 extern void __gconv_release_shlib (struct __gconv_loaded_object *handle)
 205      internal_function;
 206
 207 /* Fill STEP with information about builtin module with NAME.  */
 208 extern void __gconv_get_builtin_trans (const char *name,
 209                                        struct __gconv_step *step)
 210      internal_function;
 211
 212 /* Try to load transliteration step module.  */
 213 extern int __gconv_translit_find (struct trans_struct *trans)
 214      internal_function;
 215
 216 /* Transliteration using the locale's data.  */
 217 extern int __gconv_transliterate (struct __gconv_step *step,
 218                                   struct __gconv_step_data *step_data,
 219                                   void *trans_data,
 220                                   __const unsigned char *inbufstart,
 221                                   __const unsigned char **inbufp,
 222                                   __const unsigned char *inbufend,
 223                                   unsigned char **outbufstart,
 224                                   size_t *irreversible);
 225
 226
 227 /* Builtin transformations.  */
 228 #ifdef _LIBC
 229 # define __BUILTIN_TRANS(Name) \
 230   extern int Name (struct __gconv_step *step,                                 \
 231                    struct __gconv_step_data *data,                            \
 232                    const unsigned char **inbuf,                               \
 233                    const unsigned char *inbufend,                             \
 234                    unsigned char **outbufstart, size_t *irreversible,         \
 235                    int do_flush, int consume_incomplete)
 236
 237 __BUILTIN_TRANS (__gconv_transform_ascii_internal);
 238 __BUILTIN_TRANS (__gconv_transform_internal_ascii);
 239 __BUILTIN_TRANS (__gconv_transform_utf8_internal);
 240 __BUILTIN_TRANS (__gconv_transform_internal_utf8);
 241 __BUILTIN_TRANS (__gconv_transform_ucs2_internal);
 242 __BUILTIN_TRANS (__gconv_transform_internal_ucs2);
 243 __BUILTIN_TRANS (__gconv_transform_ucs2reverse_internal);
 244 __BUILTIN_TRANS (__gconv_transform_internal_ucs2reverse);
 245 __BUILTIN_TRANS (__gconv_transform_internal_ucs4);
 246 __BUILTIN_TRANS (__gconv_transform_ucs4_internal);
 247 __BUILTIN_TRANS (__gconv_transform_internal_ucs4le);
 248 __BUILTIN_TRANS (__gconv_transform_ucs4le_internal);
 249 __BUILTIN_TRANS (__gconv_transform_internal_utf16);
 250 __BUILTIN_TRANS (__gconv_transform_utf16_internal);
 251 # undef __BUITLIN_TRANS
 252
 253 #endif
 254
 255 __END_DECLS
 256
 257 #endif /* gconv_int.h */