CRC in CDB Files about leveled HOT 3 CLOSED

The object compression using binary_to_term uses zlib ... but doesn't necessarily checksum. You can bit-flip in a binary, and get the bit-flipped result even if it was created with compression.

I speculate that if the term cannot be compressed, it isn't compressed and so there will be no CRC check.

A CRC check is necessary, regardless of the the use of term_to_binary compression.

from leveled.

Also the Key is not CRC checked. It may crash in an unexpected place (for example if it passes binary_to_term, but is a tuple with the wrong number of elements)

from leveled.

#140

This doesn't resolve the compatibility problem, in that another CDB reader would have to discard/ignore the checksum in the application. However, cdb compatibility is not a core goal.

This PR stops the crashes on corrupted keys, and so the issue is closed.

from leveled.