1// IStream.h
2
3#ifndef __ISTREAM_H
4#define __ISTREAM_H
5
6#include "../Common/MyUnknown.h"
7#include "../Common/Types.h"
8
9#include "IDecl.h"
10
11#define STREAM_INTERFACE_SUB(i, base, x) DECL_INTERFACE_SUB(i, base, 3, x)
12#define STREAM_INTERFACE(i, x) STREAM_INTERFACE_SUB(i, IUnknown, x)
13
14STREAM_INTERFACE(ISequentialInStream, 0x01)
15{
16  STDMETHOD(Read)(void *data, UInt32 size, UInt32 *processedSize) PURE;
17  /*
18  Out: if size != 0, return_value = S_OK and (*processedSize == 0),
19    then there are no more bytes in stream.
20  if (size > 0) && there are bytes in stream,
21  this function must read at least 1 byte.
22  This function is allowed to read less than number of remaining bytes in stream.
23  You must call Read function in loop, if you need exact amount of data
24  */
25};
26
27STREAM_INTERFACE(ISequentialOutStream, 0x02)
28{
29  STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize) PURE;
30  /*
31  if (size > 0) this function must write at least 1 byte.
32  This function is allowed to write less than "size".
33  You must call Write function in loop, if you need to write exact amount of data
34  */
35};
36
37STREAM_INTERFACE_SUB(IInStream, ISequentialInStream, 0x03)
38{
39  STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition) PURE;
40};
41
42STREAM_INTERFACE_SUB(IOutStream, ISequentialOutStream, 0x04)
43{
44  STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition) PURE;
45  STDMETHOD(SetSize)(UInt64 newSize) PURE;
46};
47
48STREAM_INTERFACE(IStreamGetSize, 0x06)
49{
50  STDMETHOD(GetSize)(UInt64 *size) PURE;
51};
52
53STREAM_INTERFACE(IOutStreamFlush, 0x07)
54{
55  STDMETHOD(Flush)() PURE;
56};
57
58#endif
59