Opcode: Added toBuffer and fromBuffer methods

lib/opcode.js

@@ -2,6 +2,7 @@
 
 var _ = require('lodash');
 var $ = require('./util/preconditions');
+var BufferUtil = require('./util/buffer');
 
 function Opcode(num) {
   if (!(this instanceof Opcode)) {
@@ -26,6 +27,11 @@ function Opcode(num) {
   return this;
 }
 
+Opcode.fromBuffer = function(buf) {
+  $.checkArgument(BufferUtil.isBuffer(buf));
+  return new Opcode(Number('0x' + buf.toString('hex')));
+};
+
 Opcode.fromNumber = function(num) {
   $.checkArgument(_.isNumber(num));
   return new Opcode(num);
@@ -40,6 +46,14 @@ Opcode.fromString = function(str) {
   return new Opcode(value);
 };
 
+Opcode.prototype.toHex = function() {
+  return this.num.toString(16);
+};
+
+Opcode.prototype.toBuffer = function() {
+  return new Buffer(this.toHex(), 'hex');
+};
+
 Opcode.prototype.toNumber = function() {
   return this.num;
 };

test/opcode.js

@@ -52,6 +52,13 @@ describe('Opcode', function() {
     });
   });
 
+  describe('#buffer', function() {
+    it('should correctly input/output a buffer', function() {
+      var buf = new Buffer('a6', 'hex');
+      Opcode.fromBuffer(buf).toBuffer().should.deep.equal(buf);
+    });
+  });
+
   describe('#fromString', function() {
     it('should work for OP_0', function() {
       Opcode.fromString('OP_0').num.should.equal(0);