[Issue249] Support for ArrayBuffer in Filer.Buffer

1. Added proxy Buffer constructor for Filer.Buffer.
2. Added tests for new Filer.Buffer.

src/buffer.js

@@ -0,0 +1,18 @@
+function FilerBuffer (subject, encoding, nonZero) {
+
+  // Automatically turn ArrayBuffer into Uint8Array so that underlying
+  // Buffer code doesn't just throw away and ignore ArrayBuffer data.
+  if (subject instanceof ArrayBuffer) {
+    subject = new Uint8Array(subject);
+  }
+
+  return new Buffer(subject, encoding, nonZero);
+};
+
+Object.keys(Buffer).forEach(function (p) {
+  if (Buffer.hasOwnProperty(p)) {
+    FilerBuffer[p] = Buffer[p];
+  }
+});
+
+module.exports = FilerBuffer;

tests/bugs/issue249.js

@@ -0,0 +1,14 @@
+var Filer = require('../..');
+var util = require('../lib/test-utils.js');
+var expect = require('chai').expect;
+
+describe('Filer.Buffer should accept initialized ArrayBuffers, issue 249', function() {
+  beforeEach(util.setup);
+  afterEach(util.cleanup);
+
+  it('should accept an ArrayBuffer with a specified size', function(done) {
+    var buffer = new Filer.Buffer(new ArrayBuffer(5));
+    expect(buffer.length).to.equal(5);
+    done();
+  });
+});

tests/index.js

@@ -68,5 +68,6 @@ require("./spec/node-js/simple/test-fs-watch-recursive");
 require("./bugs/issue105");
 require("./bugs/issue106");
 require("./bugs/issue239");
+require("./bugs/issue249");
 require("./bugs/ls-depth-bug");
 require("./bugs/issue247.js");