Add toJSON() function to binary decoder

lib/www/server/lib/binary/decode.js

@@ -103,7 +103,30 @@ function unpack (data, index=0, endianness = platformEndianness) {
 	return bundles;
 }
 
+function toJSON (data, index=0, endianness = platformEndianness) {
+	const items = [];
+	const chunks = unpack(data, index, endianness);
+	for (const chunk of chunks) {
+		const type = chunk.type;
+		const sequence = chunk.seq;
+		let point = chunk.sp0;
+		let timestamp = Number(chunk.ts0);
+		for (let i=0; i < chunk.count; i++) {
+			const longitude = chunk.positions[i*2 + 0];
+			const latitude  = chunk.positions[i*2 + 1];
+			timestamp += chunk.Δts[i];
+			const Δi = chunk.Δij[i*2 + 0];
+			const Δj = chunk.Δij[i*2 + 1];
+
+			items.push({ type, sequence, point, timestamp, longitude, latitude, Δi, Δj });
+			point += chunk.Δsp;
+		}
+	}
+	return items;
+}
+
 module.exports = {
 	unbundle,
-	unpack
+	unpack,
+	toJSON
 };