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