1 files changed, 58 insertions, 0 deletions
diff --git a/gerrit-patch-jgit/src/main/java/org/eclipse/jgit/lib/ObjectIdSerialization.java b/gerrit-patch-jgit/src/main/java/org/eclipse/jgit/lib/ObjectIdSerialization.java
new file mode 100644
index 0000000000..68a0fd4309
--- /dev/null
+++ b/gerrit-patch-jgit/src/main/java/org/eclipse/jgit/lib/ObjectIdSerialization.java
@@ -0,0 +1,58 @@
+// Copyright (C) 2009 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package org.eclipse.jgit.lib;
+
+import org.eclipse.jgit.util.NB;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class ObjectIdSerialization {
+  public static void writeCanBeNull(final OutputStream out, final AnyObjectId id)
+      throws IOException {
+    if (id != null) {
+      out.write((byte)1);
+      writeNotNull(out, id);
+    } else {
+      out.write((byte)0);
+    }
+  }
+
+  public static void writeNotNull(final OutputStream out, final AnyObjectId id)
+      throws IOException {
+    id.copyRawTo(out);
+  }
+
+  public static ObjectId readCanBeNull(final InputStream in) throws IOException {
+    switch (in.read()) {
+      case 0:
+        return null;
+      case 1:
+        return readNotNull(in);
+      default:
+        throw new IOException("Invalid flag before ObjectId");
+    }
+  }
+
+  public static ObjectId readNotNull(final InputStream in) throws IOException {
+    final byte[] b = new byte[20];
+    NB.readFully(in, b, 0, 20);
+    return ObjectId.fromRaw(b);
+  }
+
+  private ObjectIdSerialization() {
+  }
+}