diff options
Diffstat (limited to 'contrib/file/Magdir/cafebabe')
| -rw-r--r-- | contrib/file/Magdir/cafebabe | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/contrib/file/Magdir/cafebabe b/contrib/file/Magdir/cafebabe new file mode 100644 index 0000000..233411c --- /dev/null +++ b/contrib/file/Magdir/cafebabe @@ -0,0 +1,21 @@ +#------------------------------------------------------------------------------ +# 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 +>4 belong >30 compiled Java class data, +>>6 beshort x version %d. +>>4 beshort x \b%d +>4 belong 1 Mach-O fat file with 1 architecture +>4 belong >1 +>>4 belong <20 Mach-O fat file with %ld architectures |
