Fingerprinting .jnilib files

[Florian Weimer]

Maybe this is a bit off-topic here, but I'm not sure where else I
could ask.

Apprently, for Darwin, there are tons of JNI libraries out there which
are probably Mach-O files in disguise, but start with the 0xCAFEBABE
magic number.  Not surprisingly, various class file parser choke on
them.  Is there are a way, based on the file header, to tell these
.jnilib files from genuine Java class files?