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100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
// IStream.h
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#ifndef __ISTREAM_H
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#define __ISTREAM_H
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#include "../Common/MyTypes.h"
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#include "../Common/MyUnknown.h"
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#include "IDecl.h"
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#define STREAM_INTERFACE_SUB(i, base, x) DECL_INTERFACE_SUB(i, base, 3, x)
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#define STREAM_INTERFACE(i, x) STREAM_INTERFACE_SUB(i, IUnknown, x)
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STREAM_INTERFACE(ISequentialInStream, 0x01)
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{
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STDMETHOD(Read)(void *data, UInt32 size, UInt32 *processedSize) PURE;
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/*
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Out: if size != 0, return_value = S_OK and (*processedSize == 0),
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then there are no more bytes in stream.
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if (size > 0) && there are bytes in stream,
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this function must read at least 1 byte.
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This function is allowed to read less than number of remaining bytes in stream.
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You must call Read function in loop, if you need exact amount of data
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If seek pointer before Read() function call was changed to position past the
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end of stream, the Read() function returns S_OK and *processedSize is set to 0.
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*/
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};
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STREAM_INTERFACE(ISequentialOutStream, 0x02)
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{
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STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize) PURE;
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/*
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if (size > 0) this function must write at least 1 byte.
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This function is allowed to write less than "size".
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You must call Write function in loop, if you need to write exact amount of data
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*/
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};
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#define HRESULT_WIN32_ERROR_NEGATIVE_SEEK __HRESULT_FROM_WIN32(ERROR_NEGATIVE_SEEK)
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/* Seek() Function
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If you seek before the beginning of the stream, Seek() function returns error code:
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Recommended error code is __HRESULT_FROM_WIN32(ERROR_NEGATIVE_SEEK).
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or STG_E_INVALIDFUNCTION
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It is allowed to seek past the end of the stream.
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if Seek() returns error, then the value of *newPosition is undefined.
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*/
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STREAM_INTERFACE_SUB(IInStream, ISequentialInStream, 0x03)
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{
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STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition) PURE;
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};
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STREAM_INTERFACE_SUB(IOutStream, ISequentialOutStream, 0x04)
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{
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STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition) PURE;
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STDMETHOD(SetSize)(UInt64 newSize) PURE;
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};
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STREAM_INTERFACE(IStreamGetSize, 0x06)
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{
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STDMETHOD(GetSize)(UInt64 *size) PURE;
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};
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STREAM_INTERFACE(IOutStreamFlush, 0x07)
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{
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STDMETHOD(Flush)() PURE;
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};
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STREAM_INTERFACE(IStreamGetProps, 0x08)
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{
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STDMETHOD(GetProps)(UInt64 *size, FILETIME *cTime, FILETIME *aTime, FILETIME *mTime, UInt32 *attrib) PURE;
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};
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struct CStreamFileProps
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{
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UInt64 Size;
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UInt64 VolID;
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UInt64 FileID_Low;
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UInt64 FileID_High;
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UInt32 NumLinks;
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UInt32 Attrib;
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FILETIME CTime;
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FILETIME ATime;
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FILETIME MTime;
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};
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STREAM_INTERFACE(IStreamGetProps2, 0x09)
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{
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STDMETHOD(GetProps2)(CStreamFileProps *props) PURE;
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};
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#endif
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