#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
# ----------------------------------------------------------------------
# extract-vmlinux - Extract uncompressed vmlinux from a kernel image
#
# Inspired from extract-ikconfig
# (c) 2009,2010 Dick Streefland <dick@streefland.net>
#
# (c) 2011 Corentin Chary <corentin.chary@gmail.com>
#
# ----------------------------------------------------------------------

check_vmlinux()
{
	if file "1ドル" | grep -q 'Linux kernel.*boot executable' ||
		readelf -h "1ドル" > /dev/null 2>&1
	then
cat "1ドル"
		exit 0
	fi
}

try_decompress()
{
	# The obscure use of the "tr" filter is to work around older versions of
	# "grep" that report the byte offset of the line instead of the pattern.

	# Try to find the header (1ドル) and decompress from here
	for	pos in `tr "1ドル\n2ドル" "\n2ドル=" < "$img" | grep -abo "^2ドル"`
	do
pos=${pos%%:*}
		tail -c+$pos "$img" | 3ドル > $tmp 2> /dev/null
		check_vmlinux $tmp
	done
}

# Check invocation:
me=${0##*/}
img=1ドル
if	[ $# -ne 1 -o ! -s "$img" ]
then
echo "Usage: $me <kernel-image>" >&2
	exit 2
fi

# Prepare temp files:
tmp=$(mktemp /tmp/vmlinux-XXX)
trap "rm -f $tmp" 0

# That didn't work, so retry after decompression.
try_decompress '037円213円010円' xy gunzip
try_decompress '3757円zXZ000円' abcde unxz
try_decompress 'BZh' xy bunzip2
try_decompress '135円0円0円0円' xxx unlzma
try_decompress '211円114円132円' xy 'lzop -d'
try_decompress '002円!L030円' xxx 'lz4 -d'
try_decompress '(265円/375円' xxx unzstd

# Finally check for uncompressed images or objects:
check_vmlinux $img

# Bail out:
echo "$me: Cannot find vmlinux." >&2