diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/7zip/Common/LockedStream.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/Common/LockedStream.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,23 @@
+// LockedStream.cpp
+
+#include "StdAfx.h"
+
+#include "LockedStream.h"
+
+HRESULT CLockedInStream::Read(UInt64 startPos, void *data, UInt32 size, 
+  UInt32 *processedSize)
+{
+  NWindows::NSynchronization::CCriticalSectionLock lock(_criticalSection);
+  RINOK(_stream->Seek(startPos, STREAM_SEEK_SET, NULL));
+  return _stream->Read(data, size, processedSize);
+}
+
+STDMETHODIMP CLockedSequentialInStreamImp::Read(void *data, UInt32 size, UInt32 *processedSize)
+{
+  UInt32 realProcessedSize = 0;
+  HRESULT result = _lockedInStream->Read(_pos, data, size, &realProcessedSize);
+  _pos += realProcessedSize;
+  if (processedSize != NULL)
+    *processedSize = realProcessedSize;
+  return result;
+}