///pub mod decode;///pub mod index; ///pub mod write; /// The offset to a chunk as seen relative to the beginning of the file containing it.pub type Offset = u64; /// A chunk file providing a table into the parent data.pub struct Index {    /// If true, we use `chunks` in a way that facilitates writing them.    will_write: bool,    /// Validated chunks as defined by their index entries.    ///    /// Note that this list cannot be empty.    chunks: Vec<index::Entry>,}