zoom-cache: A streamable, seekable, zoomable cache file format

These are some of the goals of the zoom-cache format:

Writing

* can be written to in streaming manner, with no backseeking

Reading

* can be read in one pass with no backseeking
* can be seeked on time-wise
* sections can be extracted
* can be read at varying zoom levels

Data

* Support multiple data types (float/double, int, bool, char)
* support multiple aggregation types for zooming (min/max, mean, rms, all/any,
    text summary)
* Constant or variable bitrates streams

Library

* Simple stream writing interface
* Simple stream reading interface
* Read seek interface
* Read set-zoom-level interface

Tools

* Verification
* Info

Interleaved streams

• Sync points

Index files

• A documented way of generating time index files

Exploded form

• one file per stream