public int Commit(IStreamImpl *pinst, uint grfCommitFlags)
{
var stm = (Stream)GCHandle.FromIntPtr(pinst->source).Target !;
stm.Flush();
return(S_OK);
}
public int SetSize(IStreamImpl *pinst, ULARGE_INTEGER libNewSize)
{
var stm = (Stream)GCHandle.FromIntPtr(pinst->source).Target !;
stm.SetLength((long)libNewSize.QuadPart + pinst->offset);
return(S_OK);
}
public int Read(IStreamImpl *pinst, void *pv, uint cb, uint *pcbRead)
{
var stm = (Stream)GCHandle.FromIntPtr(pinst->source).Target !;
*pcbRead = (uint)stm.Read(new Span <byte>(pv, (int)cb));
return(S_OK);
}
public int QueryInterface(IStreamImpl *pinst, Guid *riid, void **ppvObject)
{
var iid = *riid;
if (iid == __uuidof <IStream>() || iid == __uuidof <ISequentialStream>() || iid == __uuidof <IUnknown>())
{
*ppvObject = pinst;
return(S_OK);
}
return(E_NOINTERFACE);
}
public int Stat(IStreamImpl *pinst, STATSTG *pstatstg, uint grfStatFlag)
{
var stm = (Stream)GCHandle.FromIntPtr(pinst->source).Target !;
*pstatstg = new STATSTG {
cbSize = new ULARGE_INTEGER {
QuadPart = (ulong)(stm.Length - pinst->offset)
}, type = (uint)STGTY.STGTY_STREAM
};
return(S_OK);
}
public int Write(IStreamImpl *pinst, void *pv, uint cb, uint *pcbWritten)
{
var stm = (Stream)GCHandle.FromIntPtr(pinst->source).Target !;
stm.Write(new ReadOnlySpan <byte>(pv, (int)cb));
if (pcbWritten is not null)
{
*pcbWritten = cb;
}
return(S_OK);
}
public int Seek(IStreamImpl *pinst, LARGE_INTEGER dlibMove, uint dwOrigin, ULARGE_INTEGER *plibNewPosition)
{
long npos = dlibMove.QuadPart + (dwOrigin == (uint)SeekOrigin.Begin ? pinst->offset : 0);
var stm = (Stream)GCHandle.FromIntPtr(pinst->source).Target !;
long cpos = stm.Position;
if (!(dwOrigin == (uint)SeekOrigin.Current && npos == 0) && !(dwOrigin == (uint)SeekOrigin.Begin && npos == cpos))
{
cpos = stm.Seek(npos, (SeekOrigin)dwOrigin);
}
if (plibNewPosition is not null)
{
plibNewPosition->QuadPart = (ulong)(cpos - pinst->offset);
}
return(S_OK);
}
public uint Release(IStreamImpl *pinst) => 1;
public uint AddRef(IStreamImpl *pinst) => 1;
public int Clone(IStreamImpl *pinst, IStream **ppstm) => E_NOTIMPL;
public int UnlockRegion(IStreamImpl *pinst, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, uint dwLockType) => E_NOTIMPL;
public int Revert(IStreamImpl *pinst) => E_NOTIMPL;
public int CopyTo(IStreamImpl *pinst, IStream *pstm, ULARGE_INTEGER cb, ULARGE_INTEGER *pcbRead, ULARGE_INTEGER *pcbWritten) => E_NOTIMPL;
