#!/system/bin/sh

SETPROP=/system/bin/setprop
GETPROP=/system/bin/getprop
BUSYBOX=/system/bin/busybox
CFGPATH="/data/media/0/iso.cfg"
ECHO="/system/bin/log -t ISOSH"


#define defalut loop device
loopdevice="/dev/block/loop7"

#check /mnt/iso
checkdevicebusy() {
	local number=`lsof|grep  /mnt/iso | $BUSYBOX wc -l`
	$ECHO "checkdevicebusy(): $number"
	return $number
}

#get free loop device for iso
getfreeloop() {
	$ECHO "getfreeloop in***********"
	local loop=0
	while [ $loop -le 7 ]
	do
		local device="/dev/block/loop$loop"
		local status=`$BUSYBOX losetup $device`
		$ECHO "getfreeloop $device : $status"
		if [ "$status" = "" ] ; then
			$ECHO "getfreeloop origin:$loopdevice<---target:$device"
			loopdevice=$device
			return 
		fi
		loop=$(( $loop + 1 ))
	done
}

releaseLoop() {
	local devicename=`$GETPROP "sys.video.loop" ""`
	local status=`$BUSYBOX losetup $devicename`
	if [ "$status" != "" ] ; then
		$ECHO "releaseLoop $devicename"
		Unmount $devicename
	fi
}

getFreeLoopDevice() {
	local devicename=`$BUSYBOX losetup -f`
	$ECHO "getFreeLoopDevice: $devicename"
	local loop=0
	while [ $loop -le 7 ]
	do
		local device="/dev/loop$loop"
		if [ "$devicename" = "$device" ] ; then
			loopdevice="/dev/block/loop$loop"
			$ECHO "getFreeLoopDevice: $loopdevice"
			return
		fi
		loop=$(( $loop + 1 ))
	done
}

Mount() {
	$ECHO "Mount"
	$ECHO "Mount(): loop:$1"
	$ECHO "Mount(): path:$2"

	$BUSYBOX losetup $1 "$2"
	if [ "$?" != 0 ] ; then
		$ECHO "$BUSYBOX losetup $1 $2 fail, result = $?"
		return
	fi
	$BUSYBOX mount -t udf $1 /mnt/iso
	if [ "$?" != 0 ] ; then
		$ECHO "$BUSYBOX mount -t udf $1 /mnt/iso fail, result = $?"
		return
	fi

	$SETPROP "sys.video.loop" "$loopdevice"
	exit 0
}

Unmount() {
	local devicename=`$GETPROP sys.video.loop`
	$ECHO "unmount:$devicename"
	$BUSYBOX losetup -d $devicename
	if [ "$?" != 0 ] ; then
		$ECHO "$BUSYBOX losetup -d $devicename fail, result $?"
		return
	fi
	$SETPROP "sys.video.loop" ""
	usleep 100
	$BUSYBOX umount -l /mnt/iso
	if [ "$?" != 0 ] ; then
		$ECHO "$BUSYBOX umount -l /mnt/iso fail, result $?"
		return
	fi
}

ReadCfg() {
	$ECHO "ReadCfg"
	$ECHO "ReadCfg CFG PATH: $CFGPATH"
	while read LINE;
	do
		$ECHO "LINE: $LINE"
		local prefix=`echo $LINE|cut -d ':' -f 1`
		local tmp=`echo $LINE|cut -d ':' -f 2`
		$ECHO "prefix: $prefix"
		$ECHO "tmp: $tmp"
		if [ $prefix == "method" ]; then
			METHOD=$tmp
			$ECHO "METHOD: $tmp"
		elif [ $prefix == "path" ]; then
			PATH=$tmp
			$ECHO "PATH: $PATH"
		fi
	done < $CFGPATH
	if [ "$?" != 0 ] ; then
		$ECHO "ReadCfg fail , result $?"
		return
	fi
}

ReadCfg
$ECHO "METHOD111 : $METHOD"
if [ $METHOD == "mount" ]; then
	checkdevicebusy
	releaseLoop
	getfreeloop
	$ECHO "PATH111 : $PATH"
	Mount $loopdevice "$PATH"
elif [ $METHOD == "unmount" ]; then
	$ECHO "unmount"
	Unmount
elif [ $METHOD == "reset" ]; then
	$BUSYBOX pkill mediaserver
fi