cc -o mkexif mkexif.c picoexif.c
if [ "$?" != "0" ]; then exit 1; fi

./mkexif > x

# form the test image from pre-spliced image
cat x1hdr.bin x x1data.bin > xtest.jpg

echo =========
exiftags -a xtest.jpg -u
echo =========
exiftool xtest.jpg -G -struct -u -U -a -e -H | grep -v '\[File\]'| grep -v '\[JFIF\]'
echo =========
hd x