The indexed_blob package provides support for reading and writing
indexed-blobs.
An indexed blob is a blob-file and an index-file pointing into the blob. The index-file can be used to find start and end offset for a file stored inside the blob.
This is aimed to work efficiently with Google Cloud Storage, enabling many small files to be stored as a single blob and index file. While facilitating individual files to be retrieved by fetching the index file, finding the start and end offset for use with an HTTP range request.
To goal of this format is to support storing the many small files generated
by dartdoc as an indexed-blob.