src/libsystemd/sd-hwdb/hwdb-internal.h

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2012 Kay Sievers <kay@vrfy.org>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19 #pragma once
  20
  21 #include "sparse-endian.h"
  22 #include "util.h"
  23
  24 #define HWDB_SIG { 'K', 'S', 'L', 'P', 'H', 'H', 'R', 'H' }
  25
  26 /* on-disk trie objects */
  27 struct trie_header_f {
  28         uint8_t signature[8];
  29
  30         /* version of tool which created the file */
  31         le64_t tool_version;
  32         le64_t file_size;
  33
  34         /* size of structures to allow them to grow */
  35         le64_t header_size;
  36         le64_t node_size;
  37         le64_t child_entry_size;
  38         le64_t value_entry_size;
  39
  40         /* offset of the root trie node */
  41         le64_t nodes_root_off;
  42
  43         /* size of the nodes and string section */
  44         le64_t nodes_len;
  45         le64_t strings_len;
  46 } _packed_;
  47
  48 struct trie_node_f {
  49         /* prefix of lookup string, shared by all children  */
  50         le64_t prefix_off;
  51         /* size of children entry array appended to the node */
  52         uint8_t children_count;
  53         uint8_t padding[7];
  54         /* size of value entry array appended to the node */
  55         le64_t values_count;
  56 } _packed_;
  57
  58 /* array of child entries, follows directly the node record */
  59 struct trie_child_entry_f {
  60         /* index of the child node */
  61         uint8_t c;
  62         uint8_t padding[7];
  63         /* offset of the child node */
  64         le64_t child_off;
  65 } _packed_;
  66
  67 /* array of value entries, follows directly the node record/child array */
  68 struct trie_value_entry_f {
  69         le64_t key_off;
  70         le64_t value_off;
  71 } _packed_;