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Binary protocol parser

Project Description

Dumpy

Dumpy is a binary parser with a declarative syntax. All you need to do is telling the framework what your data look like, and let Dumpy do the rest.

Dumpy supports python versions >= 3.0.

Installing

Just use pip or tools alike:

pip install dumpy

Usage

To parse a pre-defined binary structure, you need to define a class for that structure. For example, a class for pascal strings :

import dumpy.types as dt

class PString(dict, metaclass=dt.DumpyMeta):
    __field_specs__ = (
        dt.field('len', dt.UInt8, default=dt.count_of('data')),
        dt.field('data', dt.UInt8, count=dt.counted_by('len')),
    )

s = PString()
s['data'] = b'\x01\x02\x03\x04'

# The length field is calculated automatically.
assert s['len'] == 4

assert s.pack() == b'\x04\x01\x02\x03\x04'

s2 = s.unpack(s.pack())
assert s2['len'] == 4
assert bytes(s2['data']) == b'\x01\x02\x03\x04'

See demo/png_packer.py for a real-world format parser.

Known Issues

  1. The type checking and conversion code in Dumpy is kind of naive, It does not check element types in a sequence.
  2. Dumpy is very slow at current stage. You may not want to use it to parse network messages or huge data structures.

Release history Release notifications

This version
History Node

0.1.2

History Node

0.1.1

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Filename, size & hash SHA256 hash help File type Python version Upload date
dumpy-0.1.2.tar.gz (7.5 kB) Copy SHA256 hash SHA256 Source None Aug 14, 2015

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