summaryrefslogtreecommitdiff
path: root/iconv/gconv_int.h
blob: df7d2ee65f865937f05c61094dcf2c8cffa3b1ba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
/* Copyright (C) 1997,1998,1999,2000,2001,2002 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"

__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 attribute_hidden;
/* Maximum length of a single path element.  */
extern size_t __gconv_max_path_elem_len attribute_hidden;


/* 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 attribute_hidden;


/* 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 = __mempcpy (tmp, suffix, 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) attribute_hidden;

/* 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) internal_function;

/* Comparison function to search alias.  */
extern int __gconv_alias_compare (const void *p1, const void *p2)
     attribute_hidden;

/* 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) attribute_hidden;


/* 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 */