pack_hx_cam_config.sh

#!/bin/sh
# v1.0

wd="/tmp/IPCAM"

mkdir -p $wd
rm -f $wd/*

tar -cf $wd/config.tar -C ./ mnt/mtd

echo "Calc checksum"
cp $wd/config.tar $wd/config.tmp
echo -n "IPCAM" >> $wd/config.tmp
md5sum $wd/config.tmp > $wd/config.md5

echo "Copy header from original config_backup.bin"
dd bs=1 count=512 if=./config_backup.bin of=./new_config.bin

echo "Insert data"
dd bs=1 seek=512 if=$wd/config.tar of=./new_config.bin

echo "Insert checksum"
dd bs=1 seek=228 count=32 if=$wd/config.md5 of=./new_config.bin conv=notrunc

unpack_ hx_cam_config.sh

#!/bin/sh
# takes a camera config backup, and unpacks it into current directory
# v1.0

# makes a temp dir for the stripped tar file
wd="/tmp/IPCAM"

mkdir -p $wd

# make sure previous files are removed
rm -f $wd/*

echo "skipping the 512b header and writing out config.tar"
dd bs=1 skip=512 if=./config_backup.bin of=$wd/config.tar
tar -xvf $wd/config.tar -C ./