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+
+#------------------------------------------------------------------------------
+# $File: apt,v 1.1 2016/10/17 19:51:57 christos Exp $
+# apt: file(1) magic for APT Cache files
+# <http://www.fifi.org/doc/libapt-pkg-doc/cache.html/ch2.html>
+# <https://anonscm.debian.org/cgit/apt/apt.git/tree/apt-pkg/pkgcache.h#n292>
+
+# before version 10 ("old format"), data was in arch-specific long/short
+
+# old format 64 bit
+0 name apt-cache-64bit-be
+>12 beshort 1 \b, dirty
+>40 bequad x \b, %llu packages
+>48 bequad x \b, %llu versions
+
+# old format 32 bit
+0 name apt-cache-32bit-be
+>8 beshort 1 \b, dirty
+>40 belong x \b, %u packages
+>44 belong x \b, %u versions
+
+# new format
+0 name apt-cache-be
+>6 byte 1 \b, dirty
+>24 belong x \b, %u packages
+>28 belong x \b, %u versions
+
+0 bequad 0x98FE76DC
+>8 ubeshort <10 APT cache data, version %u
+>>10 beshort x \b.%u, 64 bit big-endian
+>>0 use apt-cache-64bit-be
+
+0 lequad 0x98FE76DC
+>8 uleshort <10 APT cache data, version %u
+>>10 leshort x \b.%u, 64 bit little-endian
+>>0 use \^apt-cache-64bit-be
+
+0 belong 0x98FE76DC
+>4 ubeshort <10 APT cache data, version %u
+>>6 ubeshort x \b.%u, 32 bit big-endian
+>>0 use apt-cache-32bit-be
+>4 ubyte >9 APT cache data, version %u
+>>5 ubyte x \b.%u, big-endian
+>>0 use apt-cache-be
+
+0 lelong 0x98FE76DC
+>4 uleshort <10 APT cache data, version %u
+>>6 uleshort x \b.%u, 32 bit little-endian
+>>0 use \^apt-cache-32bit-be
+>4 ubyte >9 APT cache data, version %u
+>>5 ubyte x \b.%u, little-endian
+>>0 use \^apt-cache-be