Method GetData

src/Git/GitDataObject.cpp:101–383

///////////////////////////////////////////////////////////////////// IDataObject /////////////////////////////////////////////////////////////////////

// IDataObject
//////////////////////////////////////////////////////////////////////////
STDMETHODIMP GitDataObject::GetData(FORMATETC* pformatetcIn, STGMEDIUM* pmedium)
{
	if (!pformatetcIn)
		return E_INVALIDARG;
	if (!pmedium)
		return E_POINTER;
	pmedium->hGlobal = nullptr;

	if ((pformatetcIn->tymed & TYMED_ISTREAM) && (pformatetcIn->dwAspect == DVASPECT_CONTENT) && (pformatetcIn->cfFormat == CF_FILECONTENTS))
	{
		// supports the IStream format.
		// The lindex param is the index of the file to return
		CString filepath;
		IStream* pIStream = nullptr;

		// Note: we don't get called for directories since those are simply created and don't
		// need to be fetched.

		// Note2: It would be really nice if we could get a stream from the subversion library
		// from where we could read the file contents. But the Subversion lib is not implemented
		// to *read* from a remote stream but so that the library *writes* to a stream we pass.
		// Since we can't get such a read stream, we have to fetch the file in whole first to
		// a temp location and then pass the shell an IStream for that temp file.

		if (m_revision.IsEmpty())
		{
			if (pformatetcIn->lindex >= 0 && pformatetcIn->lindex < static_cast<LONG>(m_allPaths.size()))
				filepath = g_Git.CombinePath(m_allPaths[pformatetcIn->lindex]);
		}
		else
		{
			filepath = CTempFiles::Instance().GetTempFilePath(true).GetWinPathString();
			if (pformatetcIn->lindex >= 0 && pformatetcIn->lindex < static_cast<LONG>(m_allPaths.size()))
			{
				if (g_Git.GetOneFile(m_revision.ToString(), m_allPaths[pformatetcIn->lindex], filepath))
				{
					DeleteFile(filepath);
					return STG_E_ACCESSDENIED;
				}
			}
		}

		HRESULT res = SHCreateStreamOnFileEx(filepath, STGM_READ, FILE_ATTRIBUTE_NORMAL, FALSE, nullptr, &pIStream);
		if (res == S_OK)
		{
			// http://blogs.msdn.com/b/oldnewthing/archive/2014/09/18/10558763.aspx
			LARGE_INTEGER liZero = { 0, 0 };
			pIStream->Seek(liZero, STREAM_SEEK_END, nullptr);

			pmedium->pstm = pIStream;
			pmedium->tymed = TYMED_ISTREAM;
			return S_OK;
		}
		return res;
	}
	else if ((pformatetcIn->tymed & TYMED_HGLOBAL) && (pformatetcIn->dwAspect == DVASPECT_CONTENT) && (pformatetcIn->cfFormat == CF_FILEDESCRIPTOR))
	{
		for (int i = 0; i < m_gitPaths.GetCount(); ++i)