#!/bin/sh

rm $2

offset=0;
keep=1;
while [ ${offset} -lt 1536 ]; do
  if [ ${keep} -eq 1 ]; then
    head -c $((offset + 8)) $1 | tail -c 8 >> $2
    keep=0
  else
    keep=1
  fi
  offset=$((offset + 8))
done