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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 reads a set of three greyscale xpm images with dimensions
# 16x1760, 7x910, 4x120 and packs them into a CHR-file for Liero.
#
# Credit goes to Sander de Jong for information regarding the CHR file format:
# http://lierohell.free.fr/lierohack/docformats/liero-chr.html
usage="Usage: $0 <inputfile{1..3}.xpm> <outputfile.CHR>"
if [ $# != 4 ]; then
echo >&2 $usage
exit 1
fi
for i in "$1" "$2" "$3"; do
if [ ! -r "$i" ]; then
echo >&2 "Unable to read file '"$i"', aborting"
exit 1
fi
done
touch "$4" 2>&- || { echo >&2 "'"$4"' is not writable, aborting"; exit 1; }
hash convert 2>&- || { echo >&2 "This script requires the "'"convert"'" tool from the "'"ImageMagick"'" suite, aborting"; exit 1; }
inputfile1="$1"
inputfile2="$2"
inputfile3="$3"
outputfile="$4"
title="Liero"
titlesize=6
img1_x=16
img1_y_factor1=16
img1_y_factor2=110
img1_y=$(($img1_y_factor1 * $img1_y_factor2))
img1_size=$(($img1_x *$img1_y))
img1_header="2 $img1_x $img1_y_factor1 $img1_y_factor2"
img2_x=7
img2_y_factor1=7
img2_y_factor2=130
img2_y=$(($img2_y_factor1 * $img2_y_factor2))
img2_size=$(($img2_x *$img2_y))
img2_header="2 $img2_x $img2_y_factor1 $img2_y_factor2"
img3_x=4
img3_y_factor1=4
img3_y_factor2=30
img3_y=$(($img3_y_factor1 * $img3_y_factor2))
img3_size=$(($img3_x *$img3_y))
img3_header="2 $img3_x $img3_y_factor1 $img3_y_factor2"
function pad {
# Write $1 NULL bytes to file
pad="$1"
p=0
until [ $p = $pad ]; do
printf "\x00" >> $outputfile
p=$(expr $p + 1)
done
}
function writedec {
# write decimal number $1 to file, and pad to $2 bytes
dec="$1"
decsize="$2"
hex="$(printf '%x\n' $1)"
d=0
for h in $(echo "$hex" | rev | fold -b2 | rev); do
printf "\x$h" >> $outputfile
export d=$(expr $d + 1)
done
if [ $decsize ]; then
pad $(($decsize - $d))
fi
}
function writestring () {
# Write string $1 to file, padding to $2 bytes
name="$1"
stringsize="$2"
s=0
for c in $(echo $name | fold -b1); do
dec=$(printf "%d\n" \'$c)
writedec $dec
export s=$(expr $s + 1)
done
if [ $stringsize ]; then
pad $(($stringsize - $s))
fi
}
# Main
echo -n "" > "$outputfile"
writestring "$title" "$titlesize"
for i in $img1_header; do
writedec "$i"
done
convert "$inputfile1" -set colorspace Gray -depth 8 gray:- >> "$outputfile"
for i in $img2_header; do
writedec "$i"
done
convert "$inputfile2" -set colorspace Gray -depth 8 gray:- >> "$outputfile"
for i in $img3_header; do
writedec "$i"
done
convert "$inputfile3" -set colorspace Gray -depth 8 gray:- >> "$outputfile"
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