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