iconv/gconv.h

   1 /* Copyright (C) 1997-1999, 2000-2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /* This header provides no interface for a user to the internals of
  20    the gconv implementation in the libc.  Therefore there is no use
  21    for these definitions beside for writing additional gconv modules.  */
  22
  23 #ifndef _GCONV_H
  24 #define _GCONV_H        1
  25
  26 #include <features.h>
  27 #define __need_mbstate_t
  28 #include <wchar.h>
  29 #define __need_size_t
  30 #define __need_wchar_t
  31 #include <stddef.h>
  32
  33 /* ISO 10646 value used to signal invalid value.  */
  34 #define __UNKNOWN_10646_CHAR    ((wchar_t) 0xfffd)
  35
  36 /* Error codes for gconv functions.  */
  37 enum
  38 {
  39   __GCONV_OK = 0,
  40   __GCONV_NOCONV,
  41   __GCONV_NODB,
  42   __GCONV_NOMEM,
  43
  44   __GCONV_EMPTY_INPUT,
  45   __GCONV_FULL_OUTPUT,
  46   __GCONV_ILLEGAL_INPUT,
  47   __GCONV_INCOMPLETE_INPUT,
  48
  49   __GCONV_ILLEGAL_DESCRIPTOR,
  50   __GCONV_INTERNAL_ERROR
  51 };
  52
  53
  54 /* Flags the `__gconv_open' function can set.  */
  55 enum
  56 {
  57   __GCONV_IS_LAST = 0x0001,
  58   __GCONV_IGNORE_ERRORS = 0x0002
  59 };
  60
  61
  62 /* Forward declarations.  */
  63 struct __gconv_step;
  64 struct __gconv_step_data;
  65 struct __gconv_loaded_object;
  66 struct __gconv_trans_data;
  67
  68
  69 /* Type of a conversion function.  */
  70 typedef int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *,
  71                             __const unsigned char **, __const unsigned char *,
  72                             unsigned char **, size_t *, int, int);
  73
  74 /* Type of a specialized conversion function for a single byte to INTERNAL.  */
  75 typedef wint_t (*__gconv_btowc_fct) (struct __gconv_step *, unsigned char);
  76
  77 /* Constructor and destructor for local data for conversion step.  */
  78 typedef int (*__gconv_init_fct) (struct __gconv_step *);
  79 typedef void (*__gconv_end_fct) (struct __gconv_step *);
  80
  81
  82 /* Type of a transliteration/transscription function.  */
  83 typedef int (*__gconv_trans_fct) (struct __gconv_step *,
  84                                   struct __gconv_step_data *, void *,
  85                                   __const unsigned char *,
  86                                   __const unsigned char **,
  87                                   __const unsigned char *, unsigned char **,
  88                                   size_t *);
  89
  90 /* Function to call to provide transliteration module with context.  */
  91 typedef int (*__gconv_trans_context_fct) (void *, __const unsigned char *,
  92                                           __const unsigned char *,
  93                                           unsigned char *, unsigned char *);
  94
  95 /* Function to query module about supported encoded character sets.  */
  96 typedef int (*__gconv_trans_query_fct) (__const char *, __const char ***,
  97                                         size_t *);
  98
  99 /* Constructor and destructor for local data for transliteration.  */
 100 typedef int (*__gconv_trans_init_fct) (void **, const char *);
 101 typedef void (*__gconv_trans_end_fct) (void *);
 102
 103 struct __gconv_trans_data
 104 {
 105   /* Transliteration/Transscription function.  */
 106   __gconv_trans_fct __trans_fct;
 107   __gconv_trans_context_fct __trans_context_fct;
 108   __gconv_trans_end_fct __trans_end_fct;
 109   void *__data;
 110   struct __gconv_trans_data *__next;
 111 };
 112
 113
 114 /* Description of a conversion step.  */
 115 struct __gconv_step
 116 {
 117   struct __gconv_loaded_object *__shlib_handle;
 118   __const char *__modname;
 119
 120   int __counter;
 121
 122   char *__from_name;
 123   char *__to_name;
 124
 125   __gconv_fct __fct;
 126   __gconv_btowc_fct __btowc_fct;
 127   __gconv_init_fct __init_fct;
 128   __gconv_end_fct __end_fct;
 129
 130   /* Information about the number of bytes needed or produced in this
 131      step.  This helps optimizing the buffer sizes.  */
 132   int __min_needed_from;
 133   int __max_needed_from;
 134   int __min_needed_to;
 135   int __max_needed_to;
 136
 137   /* Flag whether this is a stateful encoding or not.  */
 138   int __stateful;
 139
 140   void *__data;         /* Pointer to step-local data.  */
 141 };
 142
 143 /* Additional data for steps in use of conversion descriptor.  This is
 144    allocated by the `init' function.  */
 145 struct __gconv_step_data
 146 {
 147   unsigned char *__outbuf;    /* Output buffer for this step.  */
 148   unsigned char *__outbufend; /* Address of first byte after the output
 149                                  buffer.  */
 150
 151   /* Is this the last module in the chain.  */
 152   int __flags;
 153
 154   /* Counter for number of invocations of the module function for this
 155      descriptor.  */
 156   int __invocation_counter;
 157
 158   /* Flag whether this is an internal use of the module (in the mb*towc*
 159      and wc*tomb* functions) or regular with iconv(3).  */
 160   int __internal_use;
 161
 162   __mbstate_t *__statep;
 163   __mbstate_t __state;  /* This element must not be used directly by
 164                            any module; always use STATEP!  */
 165
 166   /* Transliteration information.  */
 167   struct __gconv_trans_data *__trans;
 168 };
 169
 170
 171 /* Combine conversion step description with data.  */
 172 typedef struct __gconv_info
 173 {
 174   size_t __nsteps;
 175   struct __gconv_step *__steps;
 176   __extension__ struct __gconv_step_data __data __flexarr;
 177 } *__gconv_t;
 178
 179 #endif /* gconv.h */