OpenWRT missing OD (octal dump)

I have a bash function using **od** command. Now I'm trying to run in on OpenWRT and see that in has not od. Also can't find it using install from opkg, because I can't find it. Is there a possibility to install it manually? I also know about **sed** but are not that familiar with it. Is it possible to do this exact task: function format { #1=data type (like u1) 2=How much bytes 3=byte starting position in file 4=file od -An -t $1 -N $2 -j $3 $4 }