diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/7zip/IStream.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/IStream.h	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,58 @@
+// IStream.h
+
+#ifndef __ISTREAM_H
+#define __ISTREAM_H
+
+#include "../Common/MyUnknown.h"
+#include "../Common/Types.h"
+
+#include "IDecl.h"
+
+#define STREAM_INTERFACE_SUB(i, base, x) DECL_INTERFACE_SUB(i, base, 3, x)
+#define STREAM_INTERFACE(i, x) STREAM_INTERFACE_SUB(i, IUnknown, x)
+
+STREAM_INTERFACE(ISequentialInStream, 0x01)
+{
+  STDMETHOD(Read)(void *data, UInt32 size, UInt32 *processedSize) PURE;
+  /*
+  Out: if size != 0, return_value = S_OK and (*processedSize == 0),
+    then there are no more bytes in stream.
+  if (size > 0) && there are bytes in stream, 
+  this function must read at least 1 byte.
+  This function is allowed to read less than number of remaining bytes in stream.
+  You must call Read function in loop, if you need exact amount of data
+  */
+};
+
+STREAM_INTERFACE(ISequentialOutStream, 0x02)
+{
+  STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize) PURE;
+  /*
+  if (size > 0) this function must write at least 1 byte.
+  This function is allowed to write less than "size".
+  You must call Write function in loop, if you need to write exact amount of data
+  */
+};
+
+STREAM_INTERFACE_SUB(IInStream, ISequentialInStream, 0x03)
+{
+  STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition) PURE;
+};
+
+STREAM_INTERFACE_SUB(IOutStream, ISequentialOutStream, 0x04)
+{
+  STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition) PURE;
+  STDMETHOD(SetSize)(Int64 newSize) PURE;
+};
+
+STREAM_INTERFACE(IStreamGetSize, 0x06)
+{
+  STDMETHOD(GetSize)(UInt64 *size) PURE;
+};
+
+STREAM_INTERFACE(IOutStreamFlush, 0x07)
+{
+  STDMETHOD(Flush)() PURE;
+};
+
+#endif