lib: use Buffer.alloc

Fix: #109

Author: indutny

lib/ip.js

@@ -8,7 +8,7 @@ ip.toBuffer = function (ip, buff, offset) {
   let result;
 
   if (this.isV4Format(ip)) {
-    result = buff || new Buffer(offset + 4);
+    result = buff || Buffer.alloc(offset + 4);
     ip.split(/\./g).map((byte) => {
       result[offset++] = parseInt(byte, 10) & 0xff;
     });
@@ -43,7 +43,7 @@ ip.toBuffer = function (ip, buff, offset) {
       sections.splice(...argv);
     }
 
-    result = buff || new Buffer(offset + 16);
+    result = buff || Buffer.alloc(offset + 16);
     for (i = 0; i < sections.length; i++) {
       const word = parseInt(sections[i], 16);
       result[offset++] = (word >> 8) & 0xff;
@@ -114,7 +114,7 @@ ip.fromPrefixLen = function (prefixlen, family) {
   if (family === 'ipv6') {
     len = 16;
   }
-  const buff = new Buffer(len);
+  const buff = Buffer.alloc(len);
 
   for (let i = 0, n = buff.length; i < n; ++i) {
     let bits = 8;
@@ -133,7 +133,7 @@ ip.mask = function (addr, mask) {
   addr = ip.toBuffer(addr);
   mask = ip.toBuffer(mask);
 
-  const result = new Buffer(Math.max(addr.length, mask.length));
+  const result = Buffer.alloc(Math.max(addr.length, mask.length));
 
   // Same protocol - do bitwise and
   let i;