migrating to buffertools best practices

Transaction.js

@@ -11,12 +11,13 @@ function spec(b) {
   var Put = b.Put || require('bufferput');
   var Parser = b.Parser || require('./util/BinaryParser').class();
   var Step = b.Step || require('step');
+  var buffertools = require('buffertools');
 
   var error = b.error || require('./util/error');
   var VerificationError = error.VerificationError;
   var MissingSourceError = error.MissingSourceError;
 
-  var COINBASE_OP = util.NULL_HASH.concat(new Buffer("FFFFFFFF", 'hex'));
+  var COINBASE_OP = buffertools.concat(util.NULL_HASH, new Buffer("FFFFFFFF", 'hex'));
 
   function TransactionIn(data) {
     if ("object" !== typeof data) {

util/util.js

@@ -3,7 +3,7 @@ var crypto = require('crypto');
 var bignum = require('bignum');
 var Binary = require('binary');
 var Put = require('bufferput');
-require('buffertools').extend();
+var buffertools = require('buffertools');
 
 var sha256 = exports.sha256 = function (data) {
   return new Buffer(crypto.createHash('sha256').update(data).digest('binary'), 'binary');
@@ -321,13 +321,15 @@ var varIntBuf = exports.varIntBuf = function varIntBuf(n) {
 };
 
 var varStrBuf = exports.varStrBuf = function varStrBuf(s) {
-  return Buffer.concat(varIntBuf(s.length), s);
+  return buffertools.concat(varIntBuf(s.length), s);
 };
 
 // Initializations
-exports.NULL_HASH = new Buffer(32).fill(0);
+exports.NULL_HASH = new Buffer(32)
+buffertools.fill(exports.NULL_HASH, 0);
 exports.EMPTY_BUFFER = new Buffer(0);
-exports.ZERO_VALUE = new Buffer(8).fill(0);
+exports.ZERO_VALUE = new Buffer(8)
+buffertools.fill(exports.ZERO_VALUE, 0);
 var INT64_MAX = new Buffer('ffffffffffffffff', 'hex');
 exports.INT64_MAX = INT64_MAX;