184 lines
4.4 KiB
C
184 lines
4.4 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "sparse-endian.h"
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#include <systemd/sd-id128.h>
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#include "macro.h"
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typedef struct Header Header;
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typedef struct ObjectHeader ObjectHeader;
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typedef union Object Object;
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typedef struct DataObject DataObject;
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typedef struct FieldObject FieldObject;
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typedef struct EntryObject EntryObject;
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typedef struct HashTableObject HashTableObject;
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typedef struct EntryArrayObject EntryArrayObject;
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typedef struct SignatureObject SignatureObject;
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typedef struct EntryItem EntryItem;
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typedef struct HashItem HashItem;
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/* Object types */
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enum {
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OBJECT_UNUSED,
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OBJECT_DATA,
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OBJECT_FIELD,
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OBJECT_ENTRY,
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OBJECT_DATA_HASH_TABLE,
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OBJECT_FIELD_HASH_TABLE,
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OBJECT_ENTRY_ARRAY,
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OBJECT_SIGNATURE,
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_OBJECT_TYPE_MAX
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};
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/* Object flags */
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enum {
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OBJECT_COMPRESSED = 1
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};
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_packed_ struct ObjectHeader {
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uint8_t type;
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uint8_t flags;
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uint8_t reserved[6];
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le64_t size;
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uint8_t payload[];
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};
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_packed_ struct DataObject {
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ObjectHeader object;
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le64_t hash;
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le64_t next_hash_offset;
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le64_t next_field_offset;
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le64_t entry_offset; /* the first array entry we store inline */
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le64_t entry_array_offset;
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le64_t n_entries;
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uint8_t payload[];
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};
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_packed_ struct FieldObject {
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ObjectHeader object;
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le64_t hash;
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le64_t next_hash_offset;
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le64_t head_data_offset;
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le64_t tail_data_offset;
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uint8_t payload[];
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};
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_packed_ struct EntryItem {
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le64_t object_offset;
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le64_t hash;
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};
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_packed_ struct EntryObject {
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ObjectHeader object;
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le64_t seqnum;
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le64_t realtime;
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le64_t monotonic;
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sd_id128_t boot_id;
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le64_t xor_hash;
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EntryItem items[];
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};
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_packed_ struct HashItem {
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le64_t head_hash_offset;
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le64_t tail_hash_offset;
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};
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_packed_ struct HashTableObject {
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ObjectHeader object;
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HashItem items[];
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};
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_packed_ struct EntryArrayObject {
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ObjectHeader object;
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le64_t next_entry_array_offset;
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le64_t items[];
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};
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#define SIGNATURE_LENGTH 160
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_packed_ struct SignatureObject {
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ObjectHeader object;
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le64_t from;
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uint8_t signature[SIGNATURE_LENGTH];
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};
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union Object {
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ObjectHeader object;
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DataObject data;
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FieldObject field;
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EntryObject entry;
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HashTableObject hash_table;
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EntryArrayObject entry_array;
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SignatureObject signature;
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};
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enum {
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STATE_OFFLINE,
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STATE_ONLINE,
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STATE_ARCHIVED
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};
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/* Header flags */
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enum {
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HEADER_INCOMPATIBLE_COMPRESSED = 1
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};
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enum {
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HEADER_COMPATIBLE_SIGNED = 1
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};
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_packed_ struct Header {
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uint8_t signature[8]; /* "LPKSHHRH" */
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uint32_t compatible_flags;
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uint32_t incompatible_flags;
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uint8_t state;
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uint8_t reserved[7];
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sd_id128_t file_id;
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sd_id128_t machine_id; /* last writer */
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sd_id128_t boot_id; /* last writer */
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sd_id128_t seqnum_id;
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le64_t header_size;
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le64_t arena_size;
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le64_t data_hash_table_offset; /* for looking up data objects */
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le64_t data_hash_table_size;
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le64_t field_hash_table_offset; /* for looking up field objects */
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le64_t field_hash_table_size;
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le64_t tail_object_offset;
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le64_t n_objects;
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le64_t n_entries;
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le64_t tail_seqnum;
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le64_t head_seqnum;
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le64_t entry_array_offset;
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le64_t head_entry_realtime;
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le64_t tail_entry_realtime;
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le64_t tail_entry_monotonic;
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/* Added in 187 */
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le64_t n_data;
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le64_t n_fields;
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};
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