new magic from Christoph Biedl

diff --git a/magic/Magdir/apt b/magic/Magdir/apt
new file mode 100644 (file)
index 0000000..2d9f159
--- /dev/null
+++ b/magic/Magdir/apt
@@ -0,0 +1,52 @@
+
+#------------------------------------------------------------------------------
+# $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