filesize="493273331"
linecount="402"
source=$1
destination=$2

MS_dd()
{
    blocks=`expr $3 / 1024`
    bytes=`expr $3 % 1024`
    dd if="$1" ibs=$2 skip=1 obs=1024 conv=sync 2> /dev/null | \
    { test $blocks -gt 0 && dd ibs=1024 obs=1024 count=$blocks ; \
      test $bytes  -gt 0 && dd ibs=1 obs=1024 count=$bytes ; } 2> /dev/null
}

offset=`head -n $linecount "$1" | wc -c | tr -d " "`
MS_dd $source $offset $filesize | bzip2 -d | tar -xv -C $destination