Ted Mielczarek 9bae5b3712 bug 518641 - fix the "unify" script to properly handle Java .class files. r=bsmedberg ...

Java .class files and Mach-O fat binaries use the same 4-byte magic
number at the start of the file. 'unify' uses the magic number to detect
Mach-O binaries, so it chokes on Java .class files. This change makes us
use the same heuristic as file(1), which is to check the second 4 bytes
in the file. Java class files put a version number there, and Mach-O
fat binaries put the number of contained architectures there. Conveniently,
Mach defines only 18 architectures, and Java's lowest shipping version
number is 43, so there's no overlap in valid values.

2009-09-29 08:31:50 -04:00

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