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#------------------------------------------------------------------------------
# $File: cafebabe,v 1.8 2009/09/19 16:28:08 christos Exp $
# Cafe Babes unite!
#
# Since Java bytecode and Mach-O fat-files have the same magic number, the test
# must be performed in the same "magic" sequence to get both right. The long
# at offset 4 in a mach-O fat file tells the number of architectures; the short at
# offset 4 in a Java bytecode file is the JVM minor version and the
# short at offset 6 is the JVM major version. Since there are only
# only 18 labeled Mach-O architectures at current, and the first released
# Java class format was version 43.0, we can safely choose any number
# between 18 and 39 to test the number of architectures against
# (and use as a hack). Let's not use 18, because the Mach-O people
# might add another one or two as time goes by...
#
0 belong 0xcafebabe
!:mime application/x-java-applet
>4 belong >30 compiled Java class data,
>>6 beshort x version %d.
>>4 beshort x \b%d
# Which is which?
#>>4 belong 0x032d (Java 1.0)
#>>4 belong 0x032d (Java 1.1)
>>4 belong 0x002e (Java 1.2)
>>4 belong 0x002f (Java 1.3)
>>4 belong 0x0030 (Java 1.4)
>>4 belong 0x0031 (Java 1.5)
>>4 belong 0x0032 (Java 1.6)
0 belong 0xcafebabe
>4 belong 1 Mach-O fat file with 1 architecture
>4 belong >1
>>4 belong <20 Mach-O fat file with %ld architectures
0 belong 0xcafed00d JAR compressed with pack200,
>>5 byte x version %d.
>>4 byte x \b%d
!:mime application/x-java-pack200
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