number; useful to check dll version */<b>
</b></pre><BR>
<pre><b>const char* LZ4_versionString (void);   </b>/**< library version string; unseful to check dll version */<b>
</b></pre><BR>
<a name="Chapter3"></a><h2>Tuning parameter</h2><pre></pre>

<pre><b>#ifndef LZ4_MEMORY_USAGE
# define LZ4_MEMORY_USAGE 14
#endif
</b><p> Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
 Increasing memory usage improves compression ratio
 Reduced memory usage may improve 