diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/7zip/Archive/Common/MultiStream.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/Archive/Common/MultiStream.h	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,76 @@
+// MultiStream.h
+
+#ifndef __MULTISTREAM_H
+#define __MULTISTREAM_H
+
+#include "../../../Common/MyCom.h"
+#include "../../../Common/MyVector.h"
+#include "../../Archive/IArchive.h"
+
+class CMultiStream: 
+  public IInStream,
+  public CMyUnknownImp
+{
+  int _streamIndex;
+  UInt64 _pos;
+  UInt64 _seekPos;
+  UInt64 _totalLength;
+public:
+  struct CSubStreamInfo
+  {
+    CMyComPtr<IInStream> Stream;
+    UInt64 Pos;
+    UInt64 Size;
+  };
+  CObjectVector<CSubStreamInfo> Streams;
+  void Init()
+  {
+    _streamIndex = 0;
+    _pos = 0;
+    _seekPos = 0;
+    _totalLength = 0;
+    for (int i = 0; i < Streams.Size(); i++)
+      _totalLength += Streams[i].Size;
+  }
+
+  MY_UNKNOWN_IMP1(IInStream)
+
+  STDMETHOD(Read)(void *data, UInt32 size, UInt32 *processedSize);
+  STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition);
+};
+
+/*
+class COutMultiStream: 
+  public IOutStream,
+  public CMyUnknownImp
+{
+  int _streamIndex; // required stream
+  UInt64 _offsetPos; // offset from start of _streamIndex index
+  UInt64 _absPos;
+  UInt64 _length;
+
+  struct CSubStreamInfo
+  {
+    CMyComPtr<ISequentialOutStream> Stream;
+    UInt64 Size;
+    UInt64 Pos;
+ };
+  CObjectVector<CSubStreamInfo> Streams;
+public:
+  CMyComPtr<IArchiveUpdateCallback2> VolumeCallback;
+  void Init()
+  {
+    _streamIndex = 0;
+    _offsetPos = 0;
+    _absPos = 0;
+    _length = 0;
+  }
+
+  MY_UNKNOWN_IMP1(IOutStream)
+
+  STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize);
+  STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition);
+};
+*/
+
+#endif