bufferutils: add equal

src/bufferutils.js

@@ -165,6 +165,16 @@ function varIntBuffer (i) {
   return buffer
 }
 
+function equal (a, b) {
+  if (a.length !== b.length) return false
+
+  for (var i = 0; i < a.length; ++i) {
+    if (a[i] !== b[i]) return false
+  }
+
+  return true
+}
+
 function reverse (buffer) {
   var buffer2 = new Buffer(buffer)
   Array.prototype.reverse.call(buffer2)
@@ -172,6 +182,7 @@ function reverse (buffer) {
 }
 
 module.exports = {
+  equal: equal,
   pushDataSize: pushDataSize,
   readPushDataInt: readPushDataInt,
   readUInt64LE: readUInt64LE,

test/bufferutils.js

@@ -77,6 +77,22 @@ describe('bufferutils', function () {
     })
   })
 
+  describe('equal', function () {
+    fixtures.valid.forEach(function (f) {
+      describe('for ' + f.hexVI, function () {
+        fixtures.valid.forEach(function (f2) {
+          it('equates the string comparison: ' + f.hexVI + ' === ' + f2.hexVI, function () {
+            var a = new Buffer(f.hexVI, 'hex')
+            var b = new Buffer(f2.hexVI, 'hex')
+            var expected = f.hexVI === f2.hexVI
+
+            assert.equal(bufferutils.equal(a, b), expected)
+          })
+        })
+      })
+    })
+  })
+
   describe('reverse', function () {
     fixtures.valid.forEach(function (f) {
       it('reverses ' + f.hex64 + ' correctly', function () {