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<pre><b>int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int maxDictSize);
</b><p>  If last 64KB data cannot be guaranteed to remain available at its current memory location,
  save it into a safer place (char* safeBuffer).
  This is schematically equivalent to a memcpy() followed by LZ4_loadDict(),
  but is much faster, because LZ4_saveDict() doesn't need to rebuild tables.
 @return : saved dictionary size in bytes (necessarily <= maxDictSize), or 0 if error.
 
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