Function filecoin_proofs_api::seal::write_and_preprocess

pub fn write_and_preprocess<R, W>(
    registered_proof: RegisteredSealProof, 
    source: R, 
    target: W, 
    piece_size: UnpaddedBytesAmount
) -> Result<(PieceInfo, UnpaddedBytesAmount)> where
    R: Read,
    W: Read + Write + Seek,