protocol: optimize framer.

lib/bcoin/protocol/framer.js

@@ -33,42 +33,6 @@ function Framer(options) {
   this.bip151 = options.bip151;
 }
 
-/**
- * Create a header for a payload.
- * @param {String} cmd - Packet type.
- * @param {Buffer} payload
- * @returns {Buffer} Header.
- */
-
-Framer.prototype.header = function header(cmd, payload, checksum) {
-  var h = new Buffer(24);
-  var len, i;
-
-  cmd = new Buffer(cmd, 'ascii');
-
-  assert(cmd.length < 12);
-  assert(payload.length <= 0xffffffff);
-
-  // Magic value
-  h.writeUInt32LE(this.network.magic, 0, true);
-
-  // Command
-  len = cmd.copy(h, 4);
-  for (i = 4 + len; i < 4 + 12; i++)
-    h[i] = 0;
-
-  // Payload length
-  h.writeUInt32LE(payload.length, 16, true);
-
-  if (!checksum)
-    checksum = utils.hash256(payload);
-
-  // Checksum
-  checksum.copy(h, 20, 0, 4);
-
-  return h;
-};
-
 /**
  * Frame a payload with a header.
  * @param {String} cmd - Packet type.
@@ -77,16 +41,39 @@ Framer.prototype.header = function header(cmd, payload, checksum) {
  */
 
 Framer.prototype.packet = function packet(cmd, payload, checksum) {
-  var header;
+  var i, packet;
 
   assert(payload, 'No payload.');
 
   if (this.bip151 && this.bip151.handshake)
     return this.bip151.packet(cmd, payload);
 
-  header = this.header(cmd, payload, checksum);
+  assert(cmd.length < 12);
+  assert(payload.length <= 0xffffffff);
 
-  return Buffer.concat([header, payload]);
+  packet = new Buffer(24 + payload.length);
+
+  // Magic value
+  packet.writeUInt32LE(this.network.magic, 0, true);
+
+  // Command
+  packet.write(cmd, 4, 'ascii');
+
+  for (i = 4 + cmd.length; i < 16; i++)
+    packet[i] = 0;
+
+  // Payload length
+  packet.writeUInt32LE(payload.length, 16, true);
+
+  if (!checksum)
+    checksum = utils.hash256(payload);
+
+  // Checksum
+  checksum.copy(packet, 20, 0, 4);
+
+  payload.copy(packet, 24);
+
+  return packet;
 };
 
 /**