intl/gmo.h

   1 /* Description of GNU message catalog format: general file layout.
   2    Copyright (C) 1995-2015 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2.1 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #ifndef _GETTEXT_H
  18 #define _GETTEXT_H 1
  19
  20 #include <limits.h>
  21
  22 /* @@ end of prolog @@ */
  23
  24 /* The magic number of the GNU message catalog format.  */
  25 #define _MAGIC 0x950412de
  26 #define _MAGIC_SWAPPED 0xde120495
  27
  28 /* Revision number of the currently used .mo (binary) file format.  */
  29 #define MO_REVISION_NUMBER 0
  30 #define MO_REVISION_NUMBER_WITH_SYSDEP_I 1
  31
  32 /* The following contortions are an attempt to use the C preprocessor
  33    to determine an unsigned integral type that is 32 bits wide.  An
  34    alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
  35    as of version autoconf-2.13, the AC_CHECK_SIZEOF macro doesn't work
  36    when cross-compiling.  */
  37
  38 #if __STDC__
  39 # define UINT_MAX_32_BITS 4294967295U
  40 #else
  41 # define UINT_MAX_32_BITS 0xFFFFFFFF
  42 #endif
  43
  44 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
  45    This should be valid for all systems GNU cares about because
  46    that doesn't include 16-bit systems, and only modern systems
  47    (that certainly have <limits.h>) have 64+-bit integral types.  */
  48
  49 #ifndef UINT_MAX
  50 # define UINT_MAX UINT_MAX_32_BITS
  51 #endif
  52
  53 #if UINT_MAX == UINT_MAX_32_BITS
  54 typedef unsigned nls_uint32;
  55 #else
  56 # if USHRT_MAX == UINT_MAX_32_BITS
  57 typedef unsigned short nls_uint32;
  58 # else
  59 #  if ULONG_MAX == UINT_MAX_32_BITS
  60 typedef unsigned long nls_uint32;
  61 #  else
  62   /* The following line is intended to throw an error.  Using #error is
  63      not portable enough.  */
  64   "Cannot determine unsigned 32-bit data type."
  65 #  endif
  66 # endif
  67 #endif
  68
  69
  70 /* Header for binary .mo file format.  */
  71 struct mo_file_header
  72 {
  73   /* The magic number.  */
  74   nls_uint32 magic;
  75   /* The revision number of the file format.  */
  76   nls_uint32 revision;
  77
  78   /* The following are only used in .mo files with major revision 0 or 1.  */
  79
  80   /* The number of strings pairs.  */
  81   nls_uint32 nstrings;
  82   /* Offset of table with start offsets of original strings.  */
  83   nls_uint32 orig_tab_offset;
  84   /* Offset of table with start offsets of translated strings.  */
  85   nls_uint32 trans_tab_offset;
  86   /* Size of hash table.  */
  87   nls_uint32 hash_tab_size;
  88   /* Offset of first hash table entry.  */
  89   nls_uint32 hash_tab_offset;
  90
  91   /* The following are only used in .mo files with minor revision >= 1.  */
  92
  93   /* The number of system dependent segments.  */
  94   nls_uint32 n_sysdep_segments;
  95   /* Offset of table describing system dependent segments.  */
  96   nls_uint32 sysdep_segments_offset;
  97   /* The number of system dependent strings pairs.  */
  98   nls_uint32 n_sysdep_strings;
  99   /* Offset of table with start offsets of original sysdep strings.  */
 100   nls_uint32 orig_sysdep_tab_offset;
 101   /* Offset of table with start offsets of translated sysdep strings.  */
 102   nls_uint32 trans_sysdep_tab_offset;
 103 };
 104
 105 /* Descriptor for static string contained in the binary .mo file.  */
 106 struct string_desc
 107 {
 108   /* Length of addressed string, not including the trailing NUL.  */
 109   nls_uint32 length;
 110   /* Offset of string in file.  */
 111   nls_uint32 offset;
 112 };
 113
 114 /* The following are only used in .mo files with minor revision >= 1.  */
 115
 116 /* Descriptor for system dependent string segment.  */
 117 struct sysdep_segment
 118 {
 119   /* Length of addressed string, including the trailing NUL.  */
 120   nls_uint32 length;
 121   /* Offset of string in file.  */
 122   nls_uint32 offset;
 123 };
 124
 125 /* Pair of a static and a system dependent segment, in struct sysdep_string.  */
 126 struct segment_pair
 127 {
 128   /* Size of static segment.  */
 129   nls_uint32 segsize;
 130   /* Reference to system dependent string segment, or ~0 at the end.  */
 131   nls_uint32 sysdepref;
 132 };
 133
 134 /* Descriptor for system dependent string.  */
 135 struct sysdep_string
 136 {
 137   /* Offset of static string segments in file.  */
 138   nls_uint32 offset;
 139   /* Alternating sequence of static and system dependent segments.
 140      The last segment is a static segment, including the trailing NUL.  */
 141   struct segment_pair segments[1];
 142 };
 143
 144 /* Marker for the end of the segments[] array.  This has the value 0xFFFFFFFF,
 145    regardless whether 'int' is 16 bit, 32 bit, or 64 bit.  */
 146 #define SEGMENTS_END ((nls_uint32) ~0)
 147
 148 /* @@ begin of epilog @@ */
 149
 150 #endif  /* gettext.h  */