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-rw-r--r--src/libsystemd/libsystemd-journal-internal/compress.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/src/libsystemd/libsystemd-journal-internal/compress.h b/src/libsystemd/libsystemd-journal-internal/compress.h
new file mode 100644
index 0000000000..c138099d9a
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+++ b/src/libsystemd/libsystemd-journal-internal/compress.h
@@ -0,0 +1,85 @@
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2011 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <unistd.h>
+
+#include "journal-def.h"
+
+const char* object_compressed_to_string(int compression);
+int object_compressed_from_string(const char *compression);
+
+int compress_blob_xz(const void *src, uint64_t src_size,
+ void *dst, size_t dst_alloc_size, size_t *dst_size);
+int compress_blob_lz4(const void *src, uint64_t src_size,
+ void *dst, size_t dst_alloc_size, size_t *dst_size);
+
+static inline int compress_blob(const void *src, uint64_t src_size,
+ void *dst, size_t dst_alloc_size, size_t *dst_size) {
+ int r;
+#ifdef HAVE_LZ4
+ r = compress_blob_lz4(src, src_size, dst, dst_alloc_size, dst_size);
+ if (r == 0)
+ return OBJECT_COMPRESSED_LZ4;
+#else
+ r = compress_blob_xz(src, src_size, dst, dst_alloc_size, 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, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max);
+int decompress_blob_lz4(const void *src, uint64_t src_size,
+ void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max);
+int decompress_blob(int compression,
+ const void *src, uint64_t src_size,
+ void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max);
+
+int decompress_startswith_xz(const void *src, uint64_t src_size,
+ void **buffer, size_t *buffer_size,
+ const void *prefix, size_t prefix_len,
+ uint8_t extra);
+int decompress_startswith_lz4(const void *src, uint64_t src_size,
+ void **buffer, size_t *buffer_size,
+ const void *prefix, size_t prefix_len,
+ uint8_t extra);
+int decompress_startswith(int compression,
+ const void *src, uint64_t src_size,
+ void **buffer, size_t *buffer_size,
+ const void *prefix, size_t prefix_len,
+ uint8_t extra);
+
+int compress_stream_xz(int fdf, int fdt, uint64_t max_bytes);
+int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes);
+
+int decompress_stream_xz(int fdf, int fdt, uint64_t max_size);
+int decompress_stream_lz4(int fdf, int fdt, uint64_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, uint64_t max_bytes);