kernel26-2.6.12-alx-r9/scripts/extract-ikconfig

#!/bin/sh
# extracts .config info from a [b]zImage file
# uses: binoffset (new), dd, zcat, strings, grep
# $arg1 is [b]zImage filename

binoffset="./scripts/binoffset"

IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"
IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"
function dump_config {
    typeset file="$1"

    start=`$binoffset $file $IKCFG_ST 2>/dev/null`
    [ "$?" != "0" ] && start="-1"
    if [ "$start" -eq "-1" ]; then
	return
    fi
    end=`$binoffset $file $IKCFG_ED 2>/dev/null`

    let start="$start + 8"
    let size="$end - $start"

    head --bytes="$end" "$file" | tail --bytes="$size" | zcat

    clean_up
    exit 0
}


usage()
{
	echo "  usage: extract-ikconfig [b]zImage_filename"
}

clean_up()
{
	if [ "$TMPFILE" != "" ]; then
		rm -f $TMPFILE
	fi
}

if [ $# -lt 1 ]
then
	usage
	exit 1
fi

TMPFILE="/tmp/ikconfig-$$"
image="$1"

# vmlinux: Attempt to dump the configuration from the file directly
dump_config "$image"

GZHDR1="0x1f 0x8b 0x08 0x00"
GZHDR2="0x1f 0x8b 0x08 0x08"

# vmlinux.gz: Check for a compressed images
off=`$binoffset "$image" $GZHDR1 2>/dev/null`
[ "$?" != "0" ] && off="-1"
if [ "$off" -eq "-1" ]; then
	off=`$binoffset "$image" $GZHDR2 2>/dev/null`
	[ "$?" != "0" ] && off="-1"
fi
if [ "$off" -eq "0" ]; then
	zcat <"$image" >"$TMPFILE"
	dump_config "$TMPFILE"
elif [ "$off" -ne "-1" ]; then
	(dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \
		zcat >"$TMPFILE"
	dump_config "$TMPFILE"
fi

echo "ERROR: Unable to extract kernel configuration information."
echo "       This kernel image may not have the config info."

clean_up
exit 1
1	#!/bin/sh
2	# extracts .config info from a [b]zImage file
3	# uses: binoffset (new), dd, zcat, strings, grep
4	# $arg1 is [b]zImage filename
5
6	binoffset="./scripts/binoffset"
7
8	IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"
9	IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"
10	function dump_config {
11	typeset file="$1"
12
13	start=`$binoffset $file $IKCFG_ST 2>/dev/null`
14	[ "$?" != "0" ] && start="-1"
15	if [ "$start" -eq "-1" ]; then
16	return
17	fi
18	end=`$binoffset $file $IKCFG_ED 2>/dev/null`
19
20	let start="$start + 8"
21	let size="$end - $start"
22
23	head --bytes="$end" "$file" \| tail --bytes="$size" \| zcat
24
25	clean_up
26	exit 0
27	}
28
29
30	usage()
31	{
32	echo " usage: extract-ikconfig [b]zImage_filename"
33	}
34
35	clean_up()
36	{
37	if [ "$TMPFILE" != "" ]; then
38	rm -f $TMPFILE
39	fi
40	}
41
42	if [ $# -lt 1 ]
43	then
44	usage
45	exit 1
46	fi
47
48	TMPFILE="/tmp/ikconfig-$$"
49	image="$1"
50
51	# vmlinux: Attempt to dump the configuration from the file directly
52	dump_config "$image"
53
54	GZHDR1="0x1f 0x8b 0x08 0x00"
55	GZHDR2="0x1f 0x8b 0x08 0x08"
56
57	# vmlinux.gz: Check for a compressed images
58	off=`$binoffset "$image" $GZHDR1 2>/dev/null`
59	[ "$?" != "0" ] && off="-1"
60	if [ "$off" -eq "-1" ]; then
61	off=`$binoffset "$image" $GZHDR2 2>/dev/null`
62	[ "$?" != "0" ] && off="-1"
63	fi
64	if [ "$off" -eq "0" ]; then
65	zcat <"$image" >"$TMPFILE"
66	dump_config "$TMPFILE"
67	elif [ "$off" -ne "-1" ]; then
68	(dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null \| \
69	zcat >"$TMPFILE"
70	dump_config "$TMPFILE"
71	fi
72
73	echo "ERROR: Unable to extract kernel configuration information."
74	echo " This kernel image may not have the config info."
75
76	clean_up
77	exit 1