iconv/gconv.h

   1 /* Copyright (C) 1997, 1998, 1999, 2000 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 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 #include <stddef.h>
  31
  32 /* ISO 10646 value used to signal invalid value.  */
  33 #define __UNKNOWN_10646_CHAR    ((wchar_t) 0xfffd)
  34
  35 /* Error codes for gconv functions.  */
  36 enum
  37 {
  38   __GCONV_OK = 0,
  39   __GCONV_NOCONV,
  40   __GCONV_NODB,
  41   __GCONV_NOMEM,
  42
  43   __GCONV_EMPTY_INPUT,
  44   __GCONV_FULL_OUTPUT,
  45   __GCONV_ILLEGAL_INPUT,
  46   __GCONV_INCOMPLETE_INPUT,
  47
  48   __GCONV_ILLEGAL_DESCRIPTOR,
  49   __GCONV_INTERNAL_ERROR
  50 };
  51
  52
  53 /* Flags the `__gconv_open' function can set.  */
  54 enum
  55 {
  56   __GCONV_IS_LAST = 0x0001,
  57   __GCONV_IGNORE_ERRORS = 0x0002
  58 };
  59
  60
  61 /* Forward declarations.  */
  62 struct __gconv_step;
  63 struct __gconv_step_data;
  64 struct __gconv_loaded_object;
  65 struct __gconv_trans_data;
  66
  67
  68 /* Type of a conversion function.  */
  69 typedef int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *,
  70                             __const unsigned char **, __const unsigned char *,
  71                             unsigned char *, size_t *, int, int);
  72
  73 /* Constructor and destructor for local data for conversion step.  */
  74 typedef int (*__gconv_init_fct) (struct __gconv_step *);
  75 typedef void (*__gconv_end_fct) (struct __gconv_step *);
  76
  77
  78 /* Type of a transliteration/transscription function.  */
  79 typedef int (*__gconv_trans_fct) (struct __gconv_step *step,
  80                                   struct __gconv_step_data *step_data,
  81                                   __const unsigned char *,
  82                                   __const unsigned char **,
  83                                   __const unsigned char *, unsigned char *,
  84                                   unsigned char **, unsigned char *, size_t *);
  85
  86 /* Function to call to provide transliteration module with context.  */
  87 typedef int (*__gconv_trans_context_fct) (struct __gconv_trans_data *data,
  88                                           __const unsigned char *,
  89                                           __const unsigned char *,
  90                                           unsigned char *, unsigned char *);
  91
  92 /* Function to query module about supported encoded character sets.  */
  93 typedef int (*__gconv_trans_query_fct) (__const char **, size_t *);
  94
  95 /* Constructor and destructor for local data for transliteration.  */
  96 typedef int (*__gconv_trans_init_fct) (void **, const char *);
  97 typedef void (*__gconv_trans_end_fct) (void *);
  98
  99 struct __gconv_trans_data
 100 {
 101   /* Transliteration/Transscription function.  */
 102   __gconv_trans_fct __trans_fct;
 103   __gconv_trans_context_fct __trans_context_fct;
 104   __gconv_trans_end_fct __trans_end_fct;
 105   void *__data;
 106 };
 107
 108
 109 /* Description of a conversion step.  */
 110 struct __gconv_step
 111 {
 112   struct __gconv_loaded_object *__shlib_handle;
 113   __const char *__modname;
 114
 115   int __counter;
 116
 117   __const char *__from_name;
 118   __const char *__to_name;
 119
 120   __gconv_fct __fct;
 121   __gconv_init_fct __init_fct;
 122   __gconv_end_fct __end_fct;
 123
 124   /* Information about the number of bytes needed or produced in this
 125      step.  This helps optimizing the buffer sizes.  */
 126   int __min_needed_from;
 127   int __max_needed_from;
 128   int __min_needed_to;
 129   int __max_needed_to;
 130
 131   /* Flag whether this is a stateful encoding or not.  */
 132   int __stateful;
 133
 134   void *__data;         /* Pointer to step-local data.  */
 135 };
 136
 137 /* Additional data for steps in use of conversion descriptor.  This is
 138    allocated by the `init' function.  */
 139 struct __gconv_step_data
 140 {
 141   unsigned char *__outbuf;    /* Output buffer for this step.  */
 142   unsigned char *__outbufend; /* Address of first byte after the output
 143                                  buffer.  */
 144
 145   /* Is this the last module in the chain.  */
 146   int __flags;
 147
 148   /* Counter for number of invocations of the module function for this
 149      descriptor.  */
 150   int __invocation_counter;
 151
 152   /* Flag whether this is an internal use of the module (in the mb*towc*
 153      and wc*tomb* functions) or regular with iconv(3).  */
 154   int __internal_use;
 155
 156   __mbstate_t *__statep;
 157   __mbstate_t __state;  /* This element must not be used directly by
 158                            any module; always use STATEP!  */
 159
 160   /* Transliteration information.  */
 161   struct __gconv_trans_data __trans;
 162 };
 163
 164
 165 /* Combine conversion step description with data.  */
 166 typedef struct __gconv_info
 167 {
 168   size_t __nsteps;
 169   struct __gconv_step *__steps;
 170   __extension__ struct __gconv_step_data __data[0];
 171 } *__gconv_t;
 172
 173 #endif /* gconv.h */