Libgta is a portable library that implements the Generic Tagged Array (GTA) file
format. This file format has the following features:

* GTAs can store any kind of data in multidimensional arrays
* GTAs can optionally use simple tags to store rich metadata
* GTAs are streamable, which allows direct reading from and writing to pipes,
  network sockets, and other non-seekable media
* GTAs can use ZLIB, BZIP2, or XZ compression, allowing a tradeoff between
  compression/decompression speed and compression ratio
* Uncompressed GTA files allow easy out-of-core data access for very large
  arrays

See http://gta.nongnu.org/ for more information.
