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#!/bin/bash
#
# This script is licensed under the BSD-2-Clause license:
#
# -----//-----
#
# Copyright (c) 2012, Martin Erik Werner <martinerikwerner@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# -----//-----
#
# This script extracts the level canvas contained within a Liero .LEV file and
# dumps it to a greyscale images in xpm format, use the 'packlev' script to
# pack it back up again.
#
# Credit goes to Tim Verweij for information regarding the LEV file format:
# http://lierohell.free.fr/lierohack/docformats/liero-lev.html

usage="Usage: $0 <inputfile.lev> <outputfile.xpm>"

if [ $# != 2 ]; then
	echo >&2 $usage
	exit 1
fi

if [ ! -r "$1" ]; then
	echo >&2 "Unable to read file '"$1"', aborting"
	exit 1
fi

touch "$2" 2>&- || { echo >&2 "'"$2"' is not writable, aborting"; exit 1; }

inputfile="$1"
outputfile="$2"

imgsize=$((504 * 350))
imgdim=504x350

dd if="$inputfile" bs=1 ibs=1 count="$imgsize" 2>/dev/null | \
	convert -depth 8 -size "$imgdim" gray:- "$outputfile"