Fix accidentally removed file.

node/LZ4.hpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c)2013-2020 ZeroTier, Inc.
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file in the project's root directory.
+ *
+ * Change Date: 2024-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2.0 of the Apache License.
+ */
+/****/
+
+#ifndef ZT_LZ4_HPP
+#define ZT_LZ4_HPP
+
+#include "Constants.hpp"
+
+namespace ZeroTier {
+
+int LZ4_compress_fast(const char *source,char *dest,int inputSize,int maxOutputSize,int acceleration = 1) noexcept;
+int LZ4_decompress_safe(const char *source,char *dest,int compressedSize,int maxDecompressedSize) noexcept;
+
+} // namespace ZeroTier
+
+#endif