iconv/gconv.h

   1 /* Copyright (C) 1997-1999, 2000-2002, 2007, 2011 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* This header provides no interface for a user to the internals of
  19    the gconv implementation in the libc.  Therefore there is no use
  20    for these definitions beside for writing additional gconv modules.  */
  21
  22 #ifndef _GCONV_H
  23 #define _GCONV_H        1
  24
  25 #include <features.h>
  26 #define __need_mbstate_t
  27 #define __need_wint_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   __GCONV_SWAP = 0x0004
  60 };
  61
  62
  63 /* Forward declarations.  */
  64 struct __gconv_step;
  65 struct __gconv_step_data;
  66 struct __gconv_loaded_object;
  67 struct __gconv_trans_data;
  68
  69
  70 /* Type of a conversion function.  */
  71 typedef int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *,
  72                             const unsigned char **, const unsigned char *,
  73                             unsigned char **, size_t *, int, int);
  74
  75 /* Type of a specialized conversion function for a single byte to INTERNAL.  */
  76 typedef wint_t (*__gconv_btowc_fct) (struct __gconv_step *, unsigned char);
  77
  78 /* Constructor and destructor for local data for conversion step.  */
  79 typedef int (*__gconv_init_fct) (struct __gconv_step *);
  80 typedef void (*__gconv_end_fct) (struct __gconv_step *);
  81
  82
  83 /* Type of a transliteration/transscription function.  */
  84 typedef int (*__gconv_trans_fct) (struct __gconv_step *,
  85                                   struct __gconv_step_data *, void *,
  86                                   const unsigned char *,
  87                                   const unsigned char **,
  88                                   const unsigned char *, unsigned char **,
  89                                   size_t *);
  90
  91 /* Function to call to provide transliteration module with context.  */
  92 typedef int (*__gconv_trans_context_fct) (void *, const unsigned char *,
  93                                           const unsigned char *,
  94                                           unsigned char *, unsigned char *);
  95
  96 /* Function to query module about supported encoded character sets.  */
  97 typedef int (*__gconv_trans_query_fct) (const char *, const char ***,
  98                                         size_t *);
  99
 100 /* Constructor and destructor for local data for transliteration.  */
 101 typedef int (*__gconv_trans_init_fct) (void **, const char *);
 102 typedef void (*__gconv_trans_end_fct) (void *);
 103
 104 struct __gconv_trans_data
 105 {
 106   /* Transliteration/Transscription function.  */
 107   __gconv_trans_fct __trans_fct;
 108   __gconv_trans_context_fct __trans_context_fct;
 109   __gconv_trans_end_fct __trans_end_fct;
 110   void *__data;
 111   struct __gconv_trans_data *__next;
 112 };
 113
 114
 115 /* Description of a conversion step.  */
 116 struct __gconv_step
 117 {
 118   struct __gconv_loaded_object *__shlib_handle;
 119   const char *__modname;
 120
 121   int __counter;
 122
 123   char *__from_name;
 124   char *__to_name;
 125
 126   __gconv_fct __fct;
 127   __gconv_btowc_fct __btowc_fct;
 128   __gconv_init_fct __init_fct;
 129   __gconv_end_fct __end_fct;
 130
 131   /* Information about the number of bytes needed or produced in this
 132      step.  This helps optimizing the buffer sizes.  */
 133   int __min_needed_from;
 134   int __max_needed_from;
 135   int __min_needed_to;
 136   int __max_needed_to;
 137
 138   /* Flag whether this is a stateful encoding or not.  */
 139   int __stateful;
 140
 141   void *__data;         /* Pointer to step-local data.  */
 142 };
 143
 144 /* Additional data for steps in use of conversion descriptor.  This is
 145    allocated by the `init' function.  */
 146 struct __gconv_step_data
 147 {
 148   unsigned char *__outbuf;    /* Output buffer for this step.  */
 149   unsigned char *__outbufend; /* Address of first byte after the output
 150                                  buffer.  */
 151
 152   /* Is this the last module in the chain.  */
 153   int __flags;
 154
 155   /* Counter for number of invocations of the module function for this
 156      descriptor.  */
 157   int __invocation_counter;
 158
 159   /* Flag whether this is an internal use of the module (in the mb*towc*
 160      and wc*tomb* functions) or regular with iconv(3).  */
 161   int __internal_use;
 162
 163   __mbstate_t *__statep;
 164   __mbstate_t __state;  /* This element must not be used directly by
 165                            any module; always use STATEP!  */
 166
 167   /* Transliteration information.  */
 168   struct __gconv_trans_data *__trans;
 169 };
 170
 171
 172 /* Combine conversion step description with data.  */
 173 typedef struct __gconv_info
 174 {
 175   size_t __nsteps;
 176   struct __gconv_step *__steps;
 177   __extension__ struct __gconv_step_data __data __flexarr;
 178 } *__gconv_t;
 179
 180 #endif /* gconv.h */