Improve file magic handling
Before this change, the magic string was read by reading the number
of bytes we're expecting to read based on our magic string. If ours
happens to be a prefix of the real one (e.g. ours is
'odoc-3.1.0' and the real one is 'odoc-3.1.0-2-g12345789') then
the check was succeeding and then the subsequent unmarshalling was
failing.
This fixes that by writing the length too, so we always unmarshal
the right length.
5fd5ef
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Aug 11 13:38 +00:00