Function filecoin_proofs::get_unsealed_range

pub fn get_unsealed_range<T: Into<PathBuf> + AsRef<Path>>(
    porep_config: PoRepConfig, 
    sealed_path: T, 
    output_path: T, 
    prover_id_in: &FrSafe, 
    sector_id_in: &FrSafe, 
    offset: UnpaddedByteIndex, 
    num_bytes: UnpaddedBytesAmount
) -> Result<UnpaddedBytesAmount>

Unseals the sector at sealed_path and returns the bytes for a piece whose first (unpadded) byte begins at offset and ends at offset plus num_bytes, inclusive. Note that the entire sector is unsealed each time this function is called.