journal: add LZ4 as optional compressor

[elogind.git] / src / journal / compress.h

diff --git a/src/journal/compress.h b/src/journal/compress.h
index f25fe86abd56423c175bdd7832e9ac2583fd03c1..92621ba5221b47121276a247aa9d76633c2abbfc 100644 (file)
--- a/src/journal/compress.h
+++ b/src/journal/compress.h
@@ -25,15 +25,62 @@
 #include <stdbool.h>
 #include <unistd.h>
 
-bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size);
+#include "journal-def.h"
 
-bool uncompress_blob(const void *src, uint64_t src_size,
-                     void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max);
+const char* object_compressed_to_string(int compression);
+int object_compressed_from_string(const char *compression);
 
-bool uncompress_startswith(const void *src, uint64_t src_size,
-                           void **buffer, uint64_t *buffer_size,
-                           const void *prefix, uint64_t prefix_len,
-                           uint8_t extra);
+int compress_blob_xz(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size);
+int compress_blob_lz4(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size);
 
-int compress_stream(int fdf, int fdt, uint32_t preset, off_t max_size);
-int decompress_stream(int fdf, int fdt, off_t max_size);
+static inline int compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size) {
+        int r;
+#ifdef HAVE_LZ4
+        r = compress_blob_lz4(src, src_size, dst, dst_size);
+        if (r == 0)
+                return OBJECT_COMPRESSED_LZ4;
+#else
+        r = compress_blob_xz(src, src_size, dst, dst_size);
+        if (r == 0)
+                return OBJECT_COMPRESSED_XZ;
+#endif
+        return r;
+}
+
+int decompress_blob_xz(const void *src, uint64_t src_size,
+                       void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max);
+int decompress_blob_lz4(const void *src, uint64_t src_size,
+                        void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max);
+int decompress_blob(int compression,
+                    const void *src, uint64_t src_size,
+                    void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max);
+
+int decompress_startswith_xz(const void *src, uint64_t src_size,
+                             void **buffer, uint64_t *buffer_size,
+                             const void *prefix, uint64_t prefix_len,
+                             uint8_t extra);
+int decompress_startswith_lz4(const void *src, uint64_t src_size,
+                              void **buffer, uint64_t *buffer_size,
+                              const void *prefix, uint64_t prefix_len,
+                              uint8_t extra);
+int decompress_startswith(int compression,
+                          const void *src, uint64_t src_size,
+                          void **buffer, uint64_t *buffer_size,
+                          const void *prefix, uint64_t prefix_len,
+                          uint8_t extra);
+
+int compress_stream_xz(int fdf, int fdt, off_t max_bytes);
+int compress_stream_lz4(int fdf, int fdt, off_t max_bytes);
+
+int decompress_stream_xz(int fdf, int fdt, off_t max_size);
+int decompress_stream_lz4(int fdf, int fdt, off_t max_size);
+
+#ifdef HAVE_LZ4
+#  define compress_stream compress_stream_lz4
+#  define COMPRESSED_EXT ".lz4"
+#else
+#  define compress_stream compress_stream_xz
+#  define COMPRESSED_EXT ".xz"
+#endif
+
+int decompress_stream(const char *filename, int fdf, int fdt, off_t max_bytes);