pycblosc2

A simple Python/CFFI interface for the C-Blosc2 library.

This tries to be a low level interface for C-Blosc2. Maybe in the future more high-level function could be added too.

This package is meant to be used in Python3. Python2 is not tested at all, so use it at your own risk.

Simple usage

In [1]: import numpy as np

In [2]: import pycblosc2 as cb2

# Create an input buffer
In [3]: a = np.arange(1000_000, dtype=np.int32)

# Create a buffer for compression
In [4]: b = np.empty(1000_000, dtype=np.int32)

# Create a buffer for decompression
In [5]: c = np.empty(1000_000, dtype=np.int32)

# Compress!
In [6]: cb2.blosc_compress(7, 1, a.dtype.itemsize, a.size * a.dtype.itemsize, a, b, b.size * b.dtype.itemsize)
Out[6]: 36256

# Decompress!
In [7]: cb2.blosc_decompress(b, c, c.size * c.dtype.itemsize)
Out[7]: 4000000

# Check for equality
In [8]: np.testing.assert_array_equal(a, c)

Testing

$ python tests.py

Installation

$ python setup.py install

Authors

• Aleix Alcacer

• Francesc Alted