backend_for_stream

lsst.images.serialization.backend_for_stream(stream: IO[bytes]) → Backend

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

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.