gio/gvdb/gvdb-format.h

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  *
   4  * This 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 of the licence, or (at your option) any later version.
   8  *
   9  * This 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 this library; if not, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Author: Ryan Lortie <desrt@desrt.ca>
  18  */
  19
  20 #ifndef __gvdb_format_h__
  21 #define __gvdb_format_h__
  22
  23 #include <glib.h>
  24
  25 typedef struct { guint16 value; } guint16_le;
  26 typedef struct { guint32 value; } guint32_le;
  27
  28 struct gvdb_pointer {
  29   guint32_le start;
  30   guint32_le end;
  31 };
  32
  33 struct gvdb_hash_header {
  34   guint32_le n_bloom_words;
  35   guint32_le n_buckets;
  36 };
  37
  38 struct gvdb_hash_item {
  39   guint32_le hash_value;
  40   guint32_le parent;
  41
  42   guint32_le key_start;
  43   guint16_le key_size;
  44   gchar type;
  45   gchar unused;
  46
  47   union
  48   {
  49     struct gvdb_pointer pointer;
  50     gchar direct[8];
  51   } value;
  52 };
  53
  54 struct gvdb_header {
  55   guint32 signature[2];
  56   guint32_le version;
  57   guint32_le options;
  58
  59   struct gvdb_pointer root;
  60 };
  61
  62 static inline guint32_le guint32_to_le (guint32 value) {
  63   guint32_le result = { GUINT32_TO_LE (value) };
  64   return result;
  65 }
  66
  67 static inline guint32 guint32_from_le (guint32_le value) {
  68   return GUINT32_FROM_LE (value.value);
  69 }
  70
  71 static inline guint16_le guint16_to_le (guint16 value) {
  72   guint16_le result = { GUINT16_TO_LE (value) };
  73   return result;
  74 }
  75
  76 static inline guint16 guint16_from_le (guint16_le value) {
  77   return GUINT16_FROM_LE (value.value);
  78 }
  79
  80 #define GVDB_SIGNATURE0 1918981703
  81 #define GVDB_SIGNATURE1 1953390953
  82 #define GVDB_SWAPPED_SIGNATURE0 GUINT32_SWAP_LE_BE (GVDB_SIGNATURE0)
  83 #define GVDB_SWAPPED_SIGNATURE1 GUINT32_SWAP_LE_BE (GVDB_SIGNATURE1)
  84
  85 #endif /* __gvdb_format_h__ */