# SPDX-License-Identifier: GPL-2.0-only

# Logic based on util/chromeos/crosfirmware.sh in coreboot cfc26ce278.
# Modifications in this version are Copyright 2021, 2023 and 2024 Leah Rowe.
# Original copyright detailed in repo: https://review.coreboot.org/coreboot/

eval "`setvars "" MRC_url MRC_url_bkup MRC_hash MRC_board SHELLBALL`"

extract_mrc()
{
	extract_shellball

	x_ "$cbfstool" "$appdir/"bios.bin extract -n mrc.bin \
	    -f "$_dest" -r RO_SECTION

	[ -n "$CONFIG_REFCODE_BLOB_FILE" ] && extract_refcode extra; :
}

extract_refcode()
{
	_refdest="${CONFIG_REFCODE_BLOB_FILE##*../}"
	e "$_refdest" f && return 0

	[ $# -lt 1 ] && extract_shellball

	# cbfstool after coreboot 4.13 changed the stage file attribute scheme,
	# and refcode is extracted from an image using the old scheme. we use
	# cbfstool from coreboot 4.11_branch, the tree used by ASUS KGPE-D16
	chkvars cbfstoolref
	x_ mkdir -p "${_refdest%/*}"

	x_ "$cbfstoolref" "$appdir/bios.bin" extract \
	    -m x86 -n fallback/refcode -f "$appdir/ref" -r RO_SECTION

	# enable the Intel GbE device, if told by offset MRC_refcode_gbe
	[ -z "$MRC_refcode_gbe" ] || x_ dd if="config/ifd/hp820g2/1.bin" \
	    of="$appdir/ref" bs=1 seek=$MRC_refcode_gbe count=1 conv=notrunc; :

	x_ mv "$appdir/ref" "$_refdest"
}

extract_shellball()
{
	chkvars "MRC_board" "CONFIG_MRC_FILE"
	SHELLBALL="chromeos-firmwareupdate-$MRC_board"

	(
	x_ cd "$appdir"
	extract_partition "${MRC_url##*/}"
	extract_archive "$SHELLBALL" .
	) || err "mrc download/extract failure"; :
}

extract_partition()
{
	printf "Extracting ROOT-A partition\n"
	ROOTP=$( printf "unit\nB\nprint\nquit\n" | \
	    parted "${1%.zip}" 2>/dev/null | grep "ROOT-A" )

	START=$(( $( echo $ROOTP | cut -f2 -d\ | tr -d "B" ) ))
	SIZE=$(( $( echo $ROOTP | cut -f4 -d\ | tr -d "B" ) ))

	x_ dd if="${1%.zip}" of="root-a.ext2" bs=1024 skip=$(( $START / 1024 )) \
	    count=$(( $SIZE / 1024 ))

	printf "cd /usr/sbin\ndump chromeos-firmwareupdate %s\nquit" \
	    "$SHELLBALL" | debugfs "root-a.ext2" || err "!extract shellball"
}