Integrate LZ4 library, compress the ramdisk

lz4/tests/datagen.h

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+/*
+    datagen.h - compressible data generator header
+    Copyright (C) Yann Collet 2012-2024
+
+    GPL v2 License
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+    You can contact the author at :
+   - LZ4 source repository : https://github.com/lz4/lz4
+   - Public forum : https://groups.google.com/forum/#!forum/lz4c
+*/
+
+
+#include <stddef.h>   /* size_t */
+
+/* RDG_genOut():
+ * Generate @size bytes of compressible data into stdout.
+ * Compressibility can be controlled using @matchProba.
+ * @LitProba is optional, and affect variability of bytes. If @litProba==0.0, default value is used.
+ * Generated data can be influenced using @seed.
+ * If @matchProba, @litProba and @seed are equal, the function always generates the same content.
+ */
+void RDG_genOut(unsigned long long size, double matchProba, double litProba, unsigned seed);
+
+/*
+ * RDG_genBuffer():
+ * Same as RDG_genOut, but generates data into provided @buffer
+ */
+void RDG_genBuffer(void* buffer, size_t size, double matchProba, double litProba, unsigned seed);