diff --git a/‎generate/input/descriptor.json‎
Lines changed: 4 additions & 1 deletion b/‎generate/input/descriptor.json‎
Lines changed: 4 additions & 1 deletion
diff --git a/‎lib/diff.js‎
Lines changed: 7 additions & 0 deletions b/‎lib/diff.js‎
Lines changed: 7 additions & 0 deletions
diff --git a/‎test/tests/diff.js‎
Lines changed: 24 additions & 0 deletions b/‎test/tests/diff.js‎
Lines changed: 24 additions & 0 deletions
@@ -524,7 +524,10 @@
       ],
       "functions": {
         "git_diff_blob_to_buffer": {
-          "ignore": true
+          "return": {
+            "isErrorCode": true
+          },
+         "isAsync": true
         },
         "git_diff_blobs": {
           "ignore": true
 
@@ -62,3 +62,10 @@ Diff.prototype.findSimilar = function(opts) {
   opts = normalizeOptions(opts, NodeGit.DiffFindOptions);
   return findSimilar.call(this, opts);
 };
+
+var blobToBuffer = Diff.prototype.blobToBuffer;
+Diff.prototype.blobToBuffer = function(old_blob, old_as_path, buffer, buffer_length, buffer_as_path, opts, file_cb, hunk_cb, line_cb) {
+  console.log("********************************");
+  opts = normalizeOptions(opts, NodeGit.DiffOptions);
+  return blobToBuffer.call(this, old_blob, old_as_path, buffer, buffer_length, buffer_as_path, opts, file_cb, hunk_cb, line_cb);
+};
@@ -145,6 +145,30 @@ describe("Diff", function() {
     });
   });
 
+  it("can diff the contents of a file to the index", function(done) {
+    this.repository.getBranchCommit("master")
+      .then(function(commit) {
+        var difffile = "LICENSE";
+        return commit.getEntry(difffile);
+      })
+      .then(function(entry) {
+        var _entry = entry;
+        return _entry.getBlob();
+      })
+      .then(function(blob) {
+        var buffer = "New Text";
+        console.log(buffer, buffer.length);
+        Diff.blobToBuffer(blob, null, buffer, buffer.length, null, null, null, function() {
+          console.log('delta');
+          done();
+        }, null, null);
+      }, function(error) {
+        console.log('Error', error);
+        throw new Error(error);
+      })
+
+  });
+
   it("can diff with a null tree", function() {
     var repo = this.repository;
     var tree = this.masterCommitTree;