Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/CPP/7zip/IStream.h

-// 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