Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / lz4.h

diff --git a/kernel/include/linux/lz4.h b/kernel/include/linux/lz4.h
new file mode 100644 (file)
index 0000000..4356686
--- /dev/null
+++ b/kernel/include/linux/lz4.h
@@ -0,0 +1,87 @@
+#ifndef __LZ4_H__
+#define __LZ4_H__
+/*
+ * LZ4 Kernel Interface
+ *
+ * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define LZ4_MEM_COMPRESS       (4096 * sizeof(unsigned char *))
+#define LZ4HC_MEM_COMPRESS     (65538 * sizeof(unsigned char *))
+
+/*
+ * lz4_compressbound()
+ * Provides the maximum size that LZ4 may output in a "worst case" scenario
+ * (input data not compressible)
+ */
+static inline size_t lz4_compressbound(size_t isize)
+{
+       return isize + (isize / 255) + 16;
+}
+
+/*
+ * lz4_compress()
+ *     src     : source address of the original data
+ *     src_len : size of the original data
+ *     dst     : output buffer address of the compressed data
+ *             This requires 'dst' of size LZ4_COMPRESSBOUND.
+ *     dst_len : is the output size, which is returned after compress done
+ *     workmem : address of the working memory.
+ *             This requires 'workmem' of size LZ4_MEM_COMPRESS.
+ *     return  : Success if return 0
+ *               Error if return (< 0)
+ *     note :  Destination buffer and workmem must be already allocated with
+ *             the defined size.
+ */
+int lz4_compress(const unsigned char *src, size_t src_len,
+               unsigned char *dst, size_t *dst_len, void *wrkmem);
+
+ /*
+  * lz4hc_compress()
+  *     src     : source address of the original data
+  *     src_len : size of the original data
+  *     dst     : output buffer address of the compressed data
+  *            This requires 'dst' of size LZ4_COMPRESSBOUND.
+  *     dst_len : is the output size, which is returned after compress done
+  *     workmem : address of the working memory.
+  *            This requires 'workmem' of size LZ4HC_MEM_COMPRESS.
+  *     return  : Success if return 0
+  *               Error if return (< 0)
+  *     note :  Destination buffer and workmem must be already allocated with
+  *             the defined size.
+  */
+int lz4hc_compress(const unsigned char *src, size_t src_len,
+               unsigned char *dst, size_t *dst_len, void *wrkmem);
+
+/*
+ * lz4_decompress()
+ *     src     : source address of the compressed data
+ *     src_len : is the input size, whcih is returned after decompress done
+ *     dest    : output buffer address of the decompressed data
+ *     actual_dest_len: is the size of uncompressed data, supposing it's known
+ *     return  : Success if return 0
+ *               Error if return (< 0)
+ *     note :  Destination buffer must be already allocated.
+ *             slightly faster than lz4_decompress_unknownoutputsize()
+ */
+int lz4_decompress(const unsigned char *src, size_t *src_len,
+               unsigned char *dest, size_t actual_dest_len);
+
+/*
+ * lz4_decompress_unknownoutputsize()
+ *     src     : source address of the compressed data
+ *     src_len : is the input size, therefore the compressed size
+ *     dest    : output buffer address of the decompressed data
+ *     dest_len: is the max size of the destination buffer, which is
+ *                     returned with actual size of decompressed data after
+ *                     decompress done
+ *     return  : Success if return 0
+ *               Error if return (< 0)
+ *     note :  Destination buffer must be already allocated.
+ */
+int lz4_decompress_unknownoutputsize(const unsigned char *src, size_t src_len,
+               unsigned char *dest, size_t *dest_len);
+#endif