#!/bin/bash
if [ -z "$1" ]; then
	PUPFILE="PS3UPDAT.PUP"
else
	PUPFILE=$1
fi

if [ ! -f "${PUPFILE}" ]; then
	echo "${PUPFILE} not found."
	exit 1;
fi

ZERO_FILE_SIZE=$(((256 * 1024 * 1024) - $(ls -l ${PUPFILE} | cut -d' ' -f5)))
echo "Need to pad ${ZERO_FILE_SIZE} null bytes..."

echo -n "Searching for optimal blocksize... "

# try larger blocksizes
BLOCKSIZE=${ZERO_FILE_SIZE}
ZERO_FILE_MULTIPLIER=1

#while (( $ZERO_FILE_SIZE % $BLOCKSIZE != 0 )); do
#	((BLOCKSIZE--))
#done;
#ZERO_FILE_MULTIPLIER=$(($ZERO_FILE_SIZE / $BLOCKSIZE))

#echo "${BLOCKSIZE} bytes."
TMPFILE="${PUPFILE}.TMP"
echo "Creating null file..."
dd if=/dev/zero of=${TMPFILE} bs=${BLOCKSIZE} count=${ZERO_FILE_MULTIPLIER} 2>/dev/null
echo "Merging firmware and null file..."
cat $PUPFILE $TMPFILE > "${PUPFILE}.disc"
rm ${TMPFILE}
echo "Done."
echo "-----------------------------------------------"
md5sum "${PUPFILE}.disc"