www.pudn.com > Nestopia137src.zip > IStream.h

// IStream.h 
 
#ifndef __ISTREAM_H 
#define __ISTREAM_H 
 
#include "MyUnknown.h" 
#include "Types.h" 
 
// "23170F69-40C1-278A-0000-000300xx0000" 
 
#define STREAM_INTERFACE_SUB(i, b, x) \ 
DEFINE_GUID(IID_ ## i, \ 
0x23170F69, 0x40C1, 0x278A, 0x00, 0x00, 0x00, 0x03, 0x00, x, 0x00, 0x00); \ 
struct i: public b 
 
#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