merge multi threading to master branch

- updated zstd to latest devel release
- lz4, lz5 and zstd is included now
- all three support threading

CPP/7zip/Compress/Lz4Encoder.h

@@ -0,0 +1,63 @@
+// (C) 2016 Tino Reichardt
+
+#define LZ4_STATIC_LINKING_ONLY
+#include "../../../C/Alloc.h"
+#include "../../../C/Threads.h"
+#include "../../../C/lz4/lz4.h"
+#include "../../../C/zstdmt/lz4mt.h"
+
+#include "../../Common/Common.h"
+#include "../../Common/MyCom.h"
+#include "../ICoder.h"
+#include "../Common/StreamUtils.h"
+
+#ifndef EXTRACT_ONLY
+namespace NCompress {
+namespace NLZ4 {
+
+struct CProps
+{
+  CProps() { clear (); }
+  void clear ()
+  {
+    memset(this, 0, sizeof (*this));
+    _ver_major = LZ4_VERSION_MAJOR;
+    _ver_minor = LZ4_VERSION_MINOR;
+    _level = 3;
+  }
+
+  Byte _ver_major;
+  Byte _ver_minor;
+  Byte _level;
+  Byte _reserved[2];
+};
+
+class CEncoder:
+  public ICompressCoder,
+  public ICompressSetCoderProperties,
+  public ICompressWriteCoderProperties,
+  public CMyUnknownImp
+{
+  CProps _props;
+
+  UInt64 _processedIn;
+  UInt64 _processedOut;
+  UInt32 _inputSize;
+  UInt32 _numThreads;
+
+  LZ4MT_CCtx *_ctx;
+  HRESULT CEncoder::ErrorOut(size_t code);
+
+public:
+  MY_UNKNOWN_IMP2 (ICompressSetCoderProperties, ICompressWriteCoderProperties)
+  STDMETHOD (Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
+  STDMETHOD (SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps);
+  STDMETHOD (WriteCoderProperties)(ISequentialOutStream *outStream);
+  STDMETHODIMP CEncoder::SetNumberOfThreads(UInt32 numThreads);
+
+  CEncoder();
+  virtual ~CEncoder();
+};
+
+}}
+#endif