WIP self-test on a bin or json file

bin/dns-test.js

@@ -0,0 +1,86 @@
+'use strict';
+
+// EXAMPLE:
+// node bin/dns-parse.js samples/a-0.mdns.bin
+
+var path = require('path');
+// pass a terminal arg
+var filename = process.argv[2];
+var outname = process.argv[3];
+
+if (!filename || /(-h)|(--help)/.test(process.argv.join(' '))) {
+  console.error("");
+  console.error("Accepts a DNS packet (binary or json), converts it, and then converts it back to verify the function of the parser and packer");
+  console.error("");
+  console.error("Usage: node bin/dns-test.js <path/to/sample.json|.bin>");
+  console.error("Example: node bin/dns-test.js ./samples/services-0.mdns.json");
+  process.exit(1);
+  return;
+}
+
+if (!outname) {
+  console.warn('');
+  console.warn(
+    "Usage: node bin/dns-pack.js '" + filename + "' './" + path.basename(filename).replace(path.extname(filename), '') + ".bin'"
+  );
+  console.warn('');
+}
+
+var PromiseA = require('bluebird');
+var fs = PromiseA.promisifyAll(require('fs'));
+var dnsjs = require('../').DNSPacket;
+var extname = path.extname(filename).substr(1).toLowerCase();
+
+if ('json' !== extname && 'bin' !== extname) {
+  console.error("The file extension must end in .json or .bin (raw DNS packet)");
+  process.exit(3);
+  return;
+}
+
+var hexdump = require('hexdump.js').hexdump;
+
+function testJsonAsync(nb) {
+  var packet = dnsjs.write(JSON.parse(nb.toString('ascii')));
+  var str = hexdump(packet);
+  console.log(str);
+  var json = dnsjs.parse(packet);
+  if (json.error) {
+    console.error(json);
+    process.exit(37);
+    return;
+  }
+
+  console.log("[OK] JSON -> binary -> JSON");
+}
+
+function testBinAsync(nb) {
+  var bin = nb.buffer.slice(nb.byteOffset, nb.byteOffset + nb.byteLength);
+  var json = dnsjs.parse(bin);
+  if (json.error) {
+    console.error(json);
+    process.exit(38);
+    return;
+  }
+  var bin = dnsjs.write(json);
+  var json2 = dnsjs.parse(bin);
+  if (json2.error) {
+    console.error(json2);
+    process.exit(37);
+    return;
+  }
+
+  var assert = require('assert');
+  json = JSON.parse(JSON.stringify());
+  assert.deepEqual(json, json2);
+
+  console.log("[OK] binary -> JSON -> binary -> JSON");
+  console.log("(compression pointer support needs to be improved in order to support direct bin -> JSON -> bin testing)");
+}
+
+if ('json' === extname) {
+  return fs.readFileAsync(filename, null).then(testJsonAsync);
+}
+
+if ('bin' === extname) {
+  return fs.readFileAsync(filename, null).then(testBinAsync);
+}