// 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

