The bpack Python package provides tools to describe and encode/decode binary data.

Binary data are assumed to be organized in records, each composed by a sequence of fields. Fields are characterized by a known size, offset (w.r.t. the beginning of the record) and datatype.

The package provides classes and functions that can be used to:

describe binary data structures in a declarative way (structures can be specified up to the bit level)
automatically generate encoders/decoders for a specified data descriptor

Encoders/decoders (backends) rely on well known Python packages like:

struct (form the standard library)
bitstruct (optional)
numpy (optional)
bitarray (optional) - partial implementation