backend_for_stream

lsst.images.serialization.backend_for_stream(stream)

Return the Backend for stream based on its leading bytes.

The stream is restored to the position it was passed in with. Compressed content is not accepted: whoever produced the stream knows how it was compressed and decompresses it before handing it over.

Parameters:

stream (IO[bytes]) – Seekable binary stream positioned at the start of the data.

Raises:

ValueError – If the leading bytes match no supported format, including when they carry gzip or zstd compression magic.

Return type:

Backend