Update to 7-Zip Version 21.03

CPP/Common/LzFindPrepare.cpp

@@ -0,0 +1,7 @@
+// Sha256Prepare.cpp
+
+#include "StdAfx.h"
+
+#include "../../C/LzFind.h"
+
+static struct CLzFindPrepare { CLzFindPrepare() { LzFindPrepare(); } } g_CLzFindPrepare;

CPP/Common/MyBuffer2.h

@@ -25,6 +25,19 @@ public:
   operator const Byte *() const { return _data; }
   size_t Size() const { return _size; }
 
+  void Alloc(size_t size)
+  {
+    if (!_data || size != _size)
+    {
+      ::MidFree(_data);
+      _size = 0;
+      _data = NULL;
+      _data = (Byte *)::MidAlloc(size);
+      if (_data)
+        _size = size;
+    }
+  }
+
   void AllocAtLeast(size_t size)
   {
     if (!_data || size > _size)
@@ -105,5 +118,22 @@ public:
   }
 };
 
+/*
+  CMidAlignedBuffer must return aligned pointer.
+   - in Windows it uses CMidBuffer(): MidAlloc() : VirtualAlloc()
+       VirtualAlloc(): Memory allocated is automatically initialized to zero.
+       MidAlloc(0) returns NULL
+   - in non-Windows systems it uses g_AlignedAlloc.
+     g_AlignedAlloc::Alloc(size = 0) can return non NULL.
+*/
+
+typedef
+#ifdef _WIN32
+  CMidBuffer
+#else
+  CAlignedBuffer
+#endif
+  CMidAlignedBuffer;
+
 
 #endif