From cbf8bcd752f5e942ac74e5a8b271b2e28a615dce Mon Sep 17 00:00:00 2001
From: Christos Zoulas <christos@zoulas.com>
Date: Tue, 27 Oct 2015 23:24:33 +0000
Subject: [PATCH] c32 fixes from Joerg Jenderek

---
 magic/Magdir/msdos | 40 +++++++++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/magic/Magdir/msdos b/magic/Magdir/msdos
index 15192415..9f7da5ad 100644
--- a/magic/Magdir/msdos
+++ b/magic/Magdir/msdos
@@ -1,6 +1,6 @@
 
 #------------------------------------------------------------------------------
-# $File: msdos,v 1.102 2015/09/30 20:32:35 christos Exp $
+# $File: msdos,v 1.103 2015/10/27 23:24:33 christos Exp $
 # msdos:  file(1) magic for MS-DOS files
 #
 
@@ -422,23 +422,41 @@
 >>4	string		\ $ARX		DOS executable (COM), ARX self-extracting archive
 >>4	string		\ $LHarc	DOS executable (COM), LHarc self-extracting archive
 >>0x20e string		SFX\ by\ LARC	DOS executable (COM), LARC self-extracting archive
-# updated by Joerg Jenderek at Oct 2008
-#0	byte		0xb8		COM executable
-0	uleshort&0x80ff	0x00b8		
+# updated by Joerg Jenderek at Oct 2008,2015
+# following line is too general
+0	ubyte		0xb8		
+# skip 2 linux kernels like memtest.bin with "\xb8\xc0\x07\x8e" in ./linux
+>0	string		!\xb8\xc0\x07\x8e	
 # modified by Joerg Jenderek
->1	lelong		!0x21cd4cff	COM executable for DOS
+# syslinux COM32 or COM32R executable
+>>1	lelong&0xFFFFFFFe 0x21CD4CFe	COM executable (32-bit COMBOOT
+# http://www.syslinux.org/wiki/index.php/Comboot_API
+# Since version 5.00 c32 modules switched from the COM32 object format to ELF
+!:mime	application/x-c32-comboot-syslinux-exec
+!:ext c32
 # http://syslinux.zytor.com/comboot.php
+# older syslinux version ( <4 )
 # (32-bit COMBOOT) programs *.C32 contain 32-bit code and run in flat-memory 32-bit protected mode
 # start with assembler instructions mov eax,21cd4cffh
-0	uleshort&0xc0ff	0xc0b8		
->1	lelong		0x21cd4cff	COM executable (32-bit COMBOOT)
+>>>1	lelong		0x21CD4CFf	\b)
 # syslinux:doc/comboot.txt
 # A COM32R program must start with the byte sequence B8 FE 4C CD 21 (mov
 # eax,21cd4cfeh) as a magic number.
-0       string/b	\xb8\xfe\x4c\xcd\x21	COM executable (COM32R)
-# start with assembler instructions mov eax,21cd4cfeh
-0	uleshort&0xc0ff	0xc0b8		
->1	lelong		0x21cd4cfe	COM executable (32-bit COMBOOT, relocatable)
+# syslinux version (4.x)
+# "COM executable (COM32R)" or "Syslinux COM32 module" by TrID
+>>>1	lelong		0x21CD4CFe	\b, relocatable)
+# remaining are DOS COM executables starting with assembler instruction MOV
+# like FreeDOS BANNER*.COM FINDDISK.COM GIF2RAW.COM WINCHK.COM
+# MS-DOS SYS.COM RESTART.COM
+# SYSLINUX.COM (version 1.40 - 2.13)
+# GFXBOOT.COM (version 3.75)
+# COPYBS.COM POWEROFF.COM INT18.COM
+>>1	default	x			COM executable for DOS
+!:mime	application/x-dosexec
+#!:mime	application/x-ms-dos-executable
+#!:mime	application/x-msdos-program
+!:ext com
+
 0	string/b	\x81\xfc		
 >4	string	\x77\x02\xcd\x20\xb9	
 >>36	string	UPX!			FREE-DOS executable (COM), UPX compressed
-- 
2.50.1