X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fjournal%2Fjournal-def.h;h=089dd9883bb7c5a3a56c6902a2d82bc159480354;hb=d12b8cad40aa78fc948362340204c3fde778082d;hp=8f00176bd70c04dc0a9713eb38ee3f8069ecc471;hpb=fb9a24b6b1ed5b1f42e6e350ccdb7e11800a83bd;p=elogind.git

diff --git a/src/journal/journal-def.h b/src/journal/journal-def.h
index 8f00176bd..089dd9883 100644
--- a/src/journal/journal-def.h
+++ b/src/journal/journal-def.h
@@ -27,6 +27,13 @@
 
 #include "macro.h"
 
+/*
+ * If you change this file you probably should also change its documentation:
+ *
+ * http://www.freedesktop.org/wiki/Software/systemd/journal-files
+ *
+ */
+
 typedef struct Header Header;
 
 typedef struct ObjectHeader ObjectHeader;
@@ -47,30 +54,34 @@ typedef struct FSSHeader FSSHeader;
 /* Object types */
 enum {
         OBJECT_UNUSED,
-        OBJECT_DATA,               /* !!! */
+        OBJECT_DATA,
         OBJECT_FIELD,
         OBJECT_ENTRY,
         OBJECT_DATA_HASH_TABLE,
         OBJECT_FIELD_HASH_TABLE,
-        OBJECT_ENTRY_ARRAY,        /* !!! */
+        OBJECT_ENTRY_ARRAY,
         OBJECT_TAG,
         _OBJECT_TYPE_MAX
 };
 
 /* Object flags */
 enum {
-        OBJECT_COMPRESSED = 1
+        OBJECT_COMPRESSED_XZ = 1 << 0,
+        OBJECT_COMPRESSED_LZ4 = 1 << 1,
+        _OBJECT_COMPRESSED_MAX
 };
 
-_packed_ struct ObjectHeader {
+#define OBJECT_COMPRESSION_MASK (OBJECT_COMPRESSED_XZ | OBJECT_COMPRESSED_LZ4)
+
+struct ObjectHeader {
         uint8_t type;
         uint8_t flags;
         uint8_t reserved[6];
         le64_t size;
         uint8_t payload[];
-};
+} _packed_;
 
-_packed_ struct DataObject {
+struct DataObject {
         ObjectHeader object;
         le64_t hash;
         le64_t next_hash_offset;
@@ -79,22 +90,22 @@ _packed_ struct DataObject {
         le64_t entry_array_offset;
         le64_t n_entries;
         uint8_t payload[];
-};
+} _packed_;
 
-_packed_ struct FieldObject {
+struct FieldObject {
         ObjectHeader object;
         le64_t hash;
         le64_t next_hash_offset;
         le64_t head_data_offset;
         uint8_t payload[];
-};
+} _packed_;
 
-_packed_ struct EntryItem {
+struct EntryItem {
         le64_t object_offset;
         le64_t hash;
-};
+} _packed_;
 
-_packed_ struct EntryObject {
+struct EntryObject {
         ObjectHeader object;
         le64_t seqnum;
         le64_t realtime;
@@ -102,32 +113,32 @@ _packed_ struct EntryObject {
         sd_id128_t boot_id;
         le64_t xor_hash;
         EntryItem items[];
-};
+} _packed_;
 
-_packed_ struct HashItem {
+struct HashItem {
         le64_t head_hash_offset;
         le64_t tail_hash_offset;
-};
+} _packed_;
 
-_packed_ struct HashTableObject {
+struct HashTableObject {
         ObjectHeader object;
         HashItem items[];
-};
+} _packed_;
 
-_packed_ struct EntryArrayObject {
+struct EntryArrayObject {
         ObjectHeader object;
         le64_t next_entry_array_offset;
         le64_t items[];
-};
+} _packed_;
 
 #define TAG_LENGTH (256/8)
 
-_packed_ struct TagObject {
+struct TagObject {
         ObjectHeader object;
-        uint64_t seqnum;
-        uint64_t epoch;
+        le64_t seqnum;
+        le64_t epoch;
         uint8_t tag[TAG_LENGTH]; /* SHA-256 HMAC */
-};
+} _packed_;
 
 union Object {
         ObjectHeader object;
@@ -148,16 +159,36 @@ enum {
 
 /* Header flags */
 enum {
-        HEADER_INCOMPATIBLE_COMPRESSED = 1
+        HEADER_INCOMPATIBLE_COMPRESSED_XZ = 1 << 0,
+        HEADER_INCOMPATIBLE_COMPRESSED_LZ4 = 1 << 1,
 };
 
+#define HEADER_INCOMPATIBLE_ANY (HEADER_INCOMPATIBLE_COMPRESSED_XZ|HEADER_INCOMPATIBLE_COMPRESSED_LZ4)
+
+#if defined(HAVE_XZ) && defined(HAVE_LZ4)
+#  define HEADER_INCOMPATIBLE_SUPPORTED HEADER_INCOMPATIBLE_ANY
+#elif defined(HAVE_XZ)
+#  define HEADER_INCOMPATIBLE_SUPPORTED HEADER_INCOMPATIBLE_COMPRESSED_XZ
+#elif defined(HAVE_LZ4)
+#  define HEADER_INCOMPATIBLE_SUPPORTED HEADER_INCOMPATIBLE_COMPRESSED_LZ4
+#else
+#  define HEADER_INCOMPATIBLE_SUPPORTED 0
+#endif
+
 enum {
         HEADER_COMPATIBLE_SEALED = 1
 };
 
+#define HEADER_COMPATIBLE_ANY HEADER_COMPATIBLE_SEALED
+#ifdef HAVE_GCRYPT
+#  define HEADER_COMPATIBLE_SUPPORTED HEADER_COMPATIBLE_SEALED
+#else
+#  define HEADER_COMPATIBLE_SUPPORTED 0
+#endif
+
 #define HEADER_SIGNATURE ((char[]) { 'L', 'P', 'K', 'S', 'H', 'H', 'R', 'H' })
 
-_packed_ struct Header {
+struct Header {
         uint8_t signature[8]; /* "LPKSHHRH" */
         le32_t compatible_flags;
         le32_t incompatible_flags;
@@ -169,9 +200,9 @@ _packed_ struct Header {
         sd_id128_t seqnum_id;
         le64_t header_size;
         le64_t arena_size;
-        le64_t data_hash_table_offset;     /* for looking up data objects */
+        le64_t data_hash_table_offset;
         le64_t data_hash_table_size;
-        le64_t field_hash_table_offset;     /* for looking up field objects */
+        le64_t field_hash_table_offset;
         le64_t field_hash_table_size;
         le64_t tail_object_offset;
         le64_t n_objects;
@@ -190,11 +221,11 @@ _packed_ struct Header {
         le64_t n_entry_arrays;
 
         /* Size: 224 */
-};
+} _packed_;
 
 #define FSS_HEADER_SIGNATURE ((char[]) { 'K', 'S', 'H', 'H', 'R', 'H', 'L', 'P' })
 
-_packed_ struct FSSHeader {
+struct FSSHeader {
         uint8_t signature[8]; /* "KSHHRHLP" */
         le32_t compatible_flags;
         le32_t incompatible_flags;
@@ -206,4 +237,4 @@ _packed_ struct FSSHeader {
         le16_t fsprg_secpar;
         le16_t reserved[3];
         le64_t fsprg_state_size;
-};
+} _packed_;