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 
14 STREAM_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 
27 STREAM_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 
37 STREAM_INTERFACE_SUB(IInStream, ISequentialInStream, 0x03)
38 {
39   STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition) PURE;
40 };
41 
42 STREAM_INTERFACE_SUB(IOutStream, ISequentialOutStream, 0x04)
43 {
44   STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition) PURE;
45   STDMETHOD(SetSize)(UInt64 newSize) PURE;
46 };
47 
48 STREAM_INTERFACE(IStreamGetSize, 0x06)
49 {
50   STDMETHOD(GetSize)(UInt64 *size) PURE;
51 };
52 
53 STREAM_INTERFACE(IOutStreamFlush, 0x07)
54 {
55   STDMETHOD(Flush)() PURE;
56 };
57 
58 #endif
59