//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
private void EnsurePieceStream(bool isLastPiece)
{
if (_pieceStream != null)
{
// Normally, the pieces are actually closed automatically for us by the
// underlying ZipIO logic, but in the case of the last piece (when we
// are called by our own Dispose(bool) method) we must close it explicitly.
if (isLastPiece)
{
_pieceStream.Close();
}
// We detect that the stream has been closed by inspecting the CanWrite property
// since this is guaranteed not to throw even when the stream is disposed.
if (!_pieceStream.CanWrite)
{
// increment our piece number so we can generate the correct
// one below
checked { ++_currentPieceNumber; }
// release it to trigger the new piece creation below
_pieceStream = null;
}
}
if (_pieceStream == null)
{
string pieceName = PieceNameHelper.CreatePieceName(
_partName,
_currentPieceNumber,
isLastPiece);
string pieceZipName = ZipPackage.GetZipItemNameFromOpcName(pieceName);
ZipFileInfo zipFileInfo = _archive.AddFile(pieceZipName, _compressionMethod, _deflateOption);
// We've just created the file, so the mode can only be Create, not CreateNew.
// (At least, this is part of ZipFileInfo's belief system.)
_pieceStream = zipFileInfo.GetStream(FileMode.Create, _access);
}
}
