journal: add LZ4 as optional compressor

[elogind.git] / src / journal / journal-def.h

diff --git a/src/journal/journal-def.h b/src/journal/journal-def.h
index 7e407a416cb1ca1674202c1162cddcc745d91d46..ecfa9a2b16a67959644f55affd542dafb340e503 100644 (file)
--- a/src/journal/journal-def.h
+++ b/src/journal/journal-def.h
@@ -66,9 +66,13 @@ enum {
 
 /* Object flags */
 enum {
-        OBJECT_COMPRESSED = 1
+        OBJECT_COMPRESSED_XZ = 1 << 0,
+        OBJECT_COMPRESSED_LZ4 = 1 << 1,
+        _OBJECT_COMPRESSED_MAX
 };
 
+#define OBJECT_COMPRESSION_MASK (OBJECT_COMPRESSED_XZ | OBJECT_COMPRESSED_LZ4)
+
 struct ObjectHeader {
         uint8_t type;
         uint8_t flags;
@@ -155,13 +159,33 @@ 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
+#if 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' })
 
 struct Header {