rcc -- convert a file to a C array of unsigned integers

rcc.sh

#!/bin/bash
# rcc.sh -- convert a file to a C array of uint16_t's

while getopts ":o:h:e:n:v" opt; do
    case $opt in
	o)  output=$OPTARG
	    ;;
	h)  header=$OPTARG
	    ;;
	e)  varre=$OPTARG
	    ;;
	v)  verbose="yes"
	    ;;
	\?) echo "Invalid option -$OPTARG; ignored" >&2
	    ;;
	:)  echo "Option -$OPTARG requires a parameter; ignored" >&2
	    ;;
    esac
done

inputs=${@:$OPTIND}

if [ ${#inputs} = "0" ]; then
    echo "No input files given." >&2 ; exit 1 ; fi

if [ -z "$output" ]; then
    output='resources.c'
    if [ -n "$verbose" ]; then
	echo "Output defaulting to $output" >&2; fi
fi

if [ -z "$header" ]; then
    header=$(echo $output | sed 's/\.[a-zA-Z0-9]*$/.h/')
    if [ -n "$verbose" ]; then
	echo "Header file defaulting to $header" >&2; fi
fi

headername=$(echo $header \
    | sed 's/[^a-zA-Z0-9]/_/g' \
    | tr '[:lower:]' '[:upper:]' \
    | sed 's/^/__RC_/' \
    | sed 's/$/__/')

echo "/* $output - automatically generated by rcc.sh */" > $output
echo '#include <stdint.h>' >> $output
echo >> $output

echo "/* $header - automatically generated by rcc.sh */" > $header
echo "#ifndef $headername" >> $header
echo "#define $headername" >> $header
echo '#include <stdint.h>' >> $header

for input in $inputs; do
    if [ ! -e "$input" ]; then
	echo "$input does not exist; ignored" >&2
    elif [ ! -f "$input" ]; then
	echo "$input is not a regular file; ignored" >&2
    else
	varname=$(echo $input | sed $varre | sed 's/[^a-zA-Z0-9]/_/g')
	varsize=$(wc -c $input | awk '{print $1}')

	echo "" >> $output
	echo "uint8_t $varname[$varsize] = {" >> $output
	od -v -t u1 $input \
	    | awk '{$1="";print}' \
	    | sed 's/\([0-9][0-9]*\)/xxx\1/g' \
	    | sed -e 's/x*\([x0-9]\{3\}\)/\1,/g' \
	    | sed 's/x/ /g' \
	    >> $output
	echo '};' >> $output
	echo "" >> $output

	echo "extern uint8_t $varname[$varsize];" >> $header
    fi
done

echo "#endif /* $headername */" >> $header