* Some WIP FTN packet processing

core/ftn_util.js

@@ -0,0 +1,84 @@
+/* jslint node: true */
+'use strict';
+
+var Config			= require('./config.js').config;
+
+
+var _				= require('lodash');
+var assert			= require('assert');
+var binary			= require('binary');
+var fs				= require('fs');
+var util			= require('util');
+
+exports.stringFromFTN			= stringFromFTN;
+exports.getFormattedFTNAddress	= getFormattedFTNAddress;
+
+
+function stringFromFTN(buf, encoding) {
+	var nullPos = buf.length;
+	for(var i = 0; i < buf.length; ++i) {
+		if(0x00 === buf[i]) {
+			nullPos = i;
+			break;
+		}
+	}
+
+	return buf.slice(0, nullPos).toString(encoding || 'utf-8');
+}
+
+function getFormattedFTNAddress3D(zone, net, node) {
+	return util.format('%d:%d/%d', zone, net, node);
+}
+
+function getFormattedFTNAddress4D(zone, net, node, point) {
+	return util.format('%d:%d/%d.%d', zone, net, node, point);
+}
+
+function getFormattedFTNAddress5D(zone, net, node, point, domain) {
+	//	:TODO:
+}
+
+function getFormattedFTNAddress(address, dimensions) {
+	var addr = util.format('%d:%d', address.zone, address.net);
+	switch(dimensions) {
+		case 2 :
+		case '2D' :
+			//	above
+			break;
+
+		case 3 :
+		case '3D' :
+			addr += util.format('/%d', address.node);
+			break;
+
+		case 4 :
+		case '4D':
+			addr += util.format('.%d', address.point || 0);	//	missing and 0 are equiv for point
+			break;
+
+		case 5 :
+		case '5D' :
+			if(address.domain) {
+				addr += util.format('@%s', address.domain);
+			}
+			break;
+	}
+
+	return addr;
+}
+
+function getFTNMessageSerialNumber(messageId) {
+    return ((Math.floor((Date.now() - Date.UTC(2015, 1, 1)) / 1000) + messageId)).toString(16);
+}
+
+function getFTNMessageID(messageId, areaId) {
+    return messageId + '.' + areaId + '@' + getFTNAddress() + ' ' + getFTNMessageSerialNumber(messageId)
+}
+
+function getFTNOriginLine() {
+	//
+	//	Specs:
+	//	http://ftsc.org/docs/fts-0004.001
+	//
+	return '  * Origin: ' + Config.general.boardName + '(' + getFidoNetAddress() + ')';
+}