#!/bin/sh
# usage: ./imgtopng.sh file
# Needs file format:
# 9	ASCII: "imageRGBA"
# 1	Any byte
# 9	ASCII string containing width
# 1	Any byte
# 9	ASCII string containing height
# 1	Any byte
# w*h	Pixels in RGBA, 1 byte per channel

sig=`cut -b 1-9 "$1"`
if [ "$sig" = "imageRGBA" ]; then
	w=`cut -b 11-19 "$1"`
	h=`cut -b 21-29 "$1"`
	cut -b 31- "$1" | convert -size "$w"x"$h" -depth 8 rgba:- png:-
else
	echo "bad image signature" >/dev/stderr
	exit 1
fi