diff --git a/‎generate/input/descriptor.json‎
Lines changed: 33 additions & 1 deletion b/‎generate/input/descriptor.json‎
Lines changed: 33 additions & 1 deletion
diff --git a/‎lib/diff.js‎
Lines changed: 28 additions & 0 deletions b/‎lib/diff.js‎
Lines changed: 28 additions & 0 deletions
diff --git a/‎test/tests/diff.js‎
Lines changed: 32 additions & 0 deletions b/‎test/tests/diff.js‎
Lines changed: 32 additions & 0 deletions
@@ -524,7 +524,39 @@
       ],
       "functions": {
         "git_diff_blob_to_buffer": {
-          "ignore": true
+          "args": {
+            "old_blob" : {
+              "isOptional": true
+            },
+            "old_as_path" : {
+              "isOptional": true
+            },
+            "buffer" : {
+              "isOptional": true
+            },
+            "buffer_len" : {
+              "isOptional": true
+            },
+            "buffer_as_path" : {
+              "isOptional": true
+            },
+            "options" : {
+              "isOptional": true
+            },
+            "file_cb" : {
+              "isOptional": true
+            },
+            "hunk_cb" : {
+              "isOptional": true
+            },
+            "line_cb" : {
+              "isOptional": true
+            }
+          },
+          "return": {
+            "isErrorCode": true
+          },
+         "isAsync": true
         },
         "git_diff_blobs": {
           "ignore": true
 
@@ -62,3 +62,31 @@ Diff.prototype.findSimilar = function(opts) {
   opts = normalizeOptions(opts, NodeGit.DiffFindOptions);
   return findSimilar.call(this, opts);
 };
+
+var blobToBuffer = Diff.blobToBuffer;
+Diff.blobToBuffer= function(
+    old_blob,
+    old_as_path,
+    buffer,
+    buffer_as_path,
+    opts,
+    file_cb,
+    hunk_cb,
+    line_cb) {
+  var bufferLength = !buffer ? 0 : buffer.length;
+
+  opts = normalizeOptions(opts, NodeGit.DiffOptions);
+
+  return blobToBuffer.call(
+    this,
+    old_blob,
+    old_as_path,
+    buffer,
+    bufferLength,
+    buffer_as_path,
+    opts,
+    file_cb,
+    hunk_cb,
+    line_cb,
+    null);
+};
@@ -145,6 +145,38 @@ describe("Diff", function() {
     });
   });
 
+  it("can diff the contents of a file to a string", function(done) {
+    this.repository.getBranchCommit("master")
+      .then(function(commit) {
+        return commit.getEntry("LICENSE");
+      })
+      .then(function(entry) {
+        var _entry = entry;
+        return _entry.getBlob();
+      })
+      .then(function(blob) {
+        var buffer = "New Text";
+        return Diff.blobToBuffer(
+          blob,
+          null,
+          buffer,
+          null,
+          null,
+          null,
+          function(delta, hunk, payload) {
+            assert.equal(hunk.oldStart(), 1);
+            assert.equal(hunk.oldLines(), 19);
+            assert.equal(hunk.newStart(), 1);
+            assert.equal(hunk.newLines(), 1);
+            assert.equal(
+              hunk.header().substring(0, hunk.headerLen() - 1),
+              "@@ -1,19 +1 @@"
+            );
+            done();
+          });
+      });
+  });
+
   it("can diff with a null tree", function() {
     var repo = this.repository;
     var tree = this.masterCommitTree;