diff options
Diffstat (limited to 'contrib/file/Magdir/mach')
| -rw-r--r-- | contrib/file/Magdir/mach | 29 |
1 files changed, 6 insertions, 23 deletions
diff --git a/contrib/file/Magdir/mach b/contrib/file/Magdir/mach index 6289a2d..cced3a5 100644 --- a/contrib/file/Magdir/mach +++ b/contrib/file/Magdir/mach @@ -1,26 +1,9 @@ -#------------------------------------------------------------------------------ -# mach file description -# -# Since Java bytecode and Mach-O fat-files have the same magic number the test -# must be preformed in the same "magic" sequence to get both right. The long -# at offset 4 in a fat file tells the number of architectures. The short at -# offset 4 in a Java bytecode file is the compiler minor version and the -# short at offset 6 is the compiler 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). -# -0 belong 0xcafebabe ->4 belong >19 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 -# The following is necessary to support java class files. ->>4 belong <20 Mach-O fat file with %ld architectures -#>>4 belong <0xffff Mach-O fat file with %ld architectures -# +#------------------------------------------------------------ +# Mach has two magic numbers, 0xcafebabe and 0xfeedface. +# Unfortunately the first, cafebabe, is shared with +# Java ByteCode, so they are both handled in the file "cafebabe". +# The "feedface" ones are handled herein. +#------------------------------------------------------------ 0 lelong&0xfeffffff 0xfeedface Mach-O >0 byte 0xcf 64-bit >12 lelong 1 object |
