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#!/bin/sh
# arguments
if [ "$#" -ne 0 ]; then
echo "usage: $0" >&2
exit 1
fi
# write input into temporary file
TMP=$(mktemp)
trap 'rm "$TMP"' EXIT
cat > "$TMP"
# determine the mime-type
if [ "$(dd if="$TMP" bs=1 count=8 2>/dev/null | tr -d '\0')" = "farbfeld" ]; then
cat "$TMP"
else
MIME=$(file -ib "$TMP" | cut -d ";" -f 1)
case "$MIME" in
image/png)
png2ff < "$TMP"
;;
image/jpeg)
jpg2ff < "$TMP"
;;
*)
convert "$TMP" png:- | png2ff
;;
esac
fi
# errors
if [ $? -ne 0 ]; then
exit 1
else
exit 0
fi
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