Add LZMA.

3rdparty/lzma-21.03beta/CPP/7zip/Common/StreamBinder.h

@@ -0,0 +1,78 @@
+// StreamBinder.h
+
+#ifndef __STREAM_BINDER_H
+#define __STREAM_BINDER_H
+
+#include "../../Windows/Synchronization.h"
+
+#include "../IStream.h"
+
+/*
+We can use one from two code versions here: with Event or with Semaphore to unlock Writer thread
+The difference for cases where Reading must be closed before Writing closing
+
+1) Event Version: _canWrite_Event
+  We call _canWrite_Event.Set() without waiting _canRead_Event in CloseRead() function.
+  The writer thread can get (_readingWasClosed) status in one from two iterations.
+  It's ambiguity of processing flow. But probably it's SAFE to use, if Event functions provide memory barriers.
+  reader thread:
+     _canWrite_Event.Set();
+     _readingWasClosed = true;
+     _canWrite_Event.Set();
+  writer thread:
+     _canWrite_Event.Wait()
+      if (_readingWasClosed)
+
+2) Semaphore Version: _canWrite_Semaphore
+  writer thread always will detect closing of reading in latest iteration after all data processing iterations
+*/
+
+class CStreamBinder
+{
+  NWindows::NSynchronization::CAutoResetEvent _canRead_Event;
+  // NWindows::NSynchronization::CAutoResetEvent _canWrite_Event;
+  NWindows::NSynchronization::CSemaphore _canWrite_Semaphore;
+
+  // bool _readingWasClosed;  // set it in reader thread and check it in write thread
+  bool _readingWasClosed2; // use it in writer thread
+  // bool WritingWasCut;
+  bool _waitWrite;         // use it in reader thread
+  UInt32 _bufSize;
+  const void *_buf;
+public:
+  UInt64 ProcessedSize;   // the size that was read by reader thread
+
+  void CreateStreams2(CMyComPtr<ISequentialInStream> &inStream, CMyComPtr<ISequentialOutStream> &outStream);
+  
+  HRESULT Create_ReInit();
+  
+  HRESULT Read(void *data, UInt32 size, UInt32 *processedSize);
+  HRESULT Write(const void *data, UInt32 size, UInt32 *processedSize);
+
+  void CloseRead_CallOnce()
+  {
+    // call it only once: for example, in destructor
+    
+    /*
+    _readingWasClosed = true;
+    _canWrite_Event.Set();
+    */
+
+    /*
+    We must relase Semaphore only once !!!
+    we must release at least 2 items of Semaphore:
+      one item to unlock partial Write(), if Read() have read some items
+      then additional item to stop writing (_bufSize will be 0)
+    */
+    _canWrite_Semaphore.Release(2);
+  }
+  
+  void CloseWrite()
+  {
+    _buf = NULL;
+    _bufSize = 0;
+    _canRead_Event.Set();
+  }
+};
+
+#endif