1#------------------------------------------------------------------------------ 2# Cafe Babes unite! 3# 4# Since Java bytecode and Mach-O fat-files have the same magic number, the test 5# must be performed in the same "magic" sequence to get both right. The long 6# at offset 4 in a mach-O fat file tells the number of architectures; the short at 7# offset 4 in a Java bytecode file is the JVM minor version and the 8# short at offset 6 is the JVM major version. Since there are only 9# only 18 labeled Mach-O architectures at current, and the first released 10# Java class format was version 43.0, we can safely choose any number 11# between 18 and 39 to test the number of architectures against 12# (and use as a hack). Let's not use 18, because the Mach-O people 13# might add another one or two as time goes by... 14# 150 belong 0xcafebabe 16!:mime application/x-java-applet 17>4 belong >30 compiled Java class data, 18>>6 beshort x version %d. 19>>4 beshort x \b%d 20# Which is which? 21#>>4 belong 0x032d (Java 1.0) 22#>>4 belong 0x032d (Java 1.1) 23>>4 belong 0x002e (Java 1.2) 24>>4 belong 0x002f (Java 1.3) 25>>4 belong 0x0030 (Java 1.4) 26>>4 belong 0x0031 (Java 1.5) 27>>4 belong 0x0032 (Java 1.6) 28 29 300 belong 0xcafebabe 31>4 belong 1 Mach-O fat file with 1 architecture 32>4 belong >1 33>>4 belong <20 Mach-O fat file with %ld architectures 34 350 belong 0xcafed00d JAR compressed with pack200, 36>>5 byte x version %d. 37>>4 byte x \b%d 38!:mime application/x-java-pack200 39