Switch to Zstandard's New advanced API.

- long distance matching is enabled
- the compression should improve, the speed also
- decompression code is single threaded only

CPP/7zip/Compress/ZstdEncoder.h

@@ -1,10 +1,9 @@
-// (C) 2016 Tino Reichardt
+// (C) 2016 - 2018 Tino Reichardt
 
 #define ZSTD_STATIC_LINKING_ONLY
 #include "../../../C/Alloc.h"
 #include "../../../C/Threads.h"
 #include "../../../C/zstd/zstd.h"
-#include "../../../C/zstdmt/zstd-mt.h"
 
 #include "../../Common/Common.h"
 #include "../../Common/MyCom.h"
@@ -41,13 +40,16 @@ class CEncoder:
 {
   CProps _props;
 
+  ZSTD_CCtx* _ctx;
+  void*  _srcBuf;
+  void*  _dstBuf;
+  size_t _srcBufSize;
+  size_t _dstBufSize;
+
   UInt64 _processedIn;
   UInt64 _processedOut;
-  UInt32 _inputSize;
   UInt32 _numThreads;
-
-  ZSTDCB_CCtx *_ctx;
-  HRESULT CEncoder::ErrorOut(size_t code);
+  HANDLE _hMutex;
 
 public:
   MY_QUERYINTERFACE_BEGIN2(ICompressCoder)