Compressor

class asdf.extension.Compressor

Bases: ABC

Abstract base class for plugins that compress binary data.

Implementing classes must provide the labels property, and at least one of the compress() and decompress() methods. May also provide a constructor.

Attributes Summary

label

Get the 4-byte label identifying this compression

Methods Summary

compress(data, **kwargs)	Compress data, yielding the results.
decompress(data, out, **kwargs)	Decompress data, writing the result into out.

Attributes Documentation

label

Get the 4-byte label identifying this compression

Returns:

labelbytes

The compression label

Methods Documentation

compress(data, **kwargs)

Compress data, yielding the results. The yield may be block-by-block, or all at once.

Parameters:

datamemoryview

The data to compress. Must be contiguous and 1D, with the underlying itemsize preserved.

**kwargs

Keyword arguments to be passed to the underlying compression function

Yields:

compressedbytes-like

A block of compressed data

decompress(data, out, **kwargs)

Decompress data, writing the result into out.

Parameters:

dataIterable of bytes-like

An Iterable of bytes-like objects containing chunks of compressed data.

outread-write bytes-like

A contiguous, 1D output array, of equal or greater length than the decompressed data.

**kwargs

Keyword arguments to be passed to the underlying decompression function

Returns:

nbytesint

The number of bytes written to out