1 files changed, 39 insertions, 0 deletions
diff --git a/src/java_tools/singlejar/java/com/google/devtools/build/singlejar/JarUtils.java b/src/java_tools/singlejar/java/com/google/devtools/build/singlejar/JarUtils.java
new file mode 100644
index 0000000000..a9c8ee3f65
--- /dev/null
+++ b/src/java_tools/singlejar/java/com/google/devtools/build/singlejar/JarUtils.java
@@ -0,0 +1,39 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// 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 com.google.devtools.build.singlejar;
+
+import java.io.IOException;
+import java.util.Date;
+
+/**
+ * Provides utilities for using ZipCombiner to pack up Jar files.
+ */
+public final class JarUtils {
+  private static final String MANIFEST_DIRECTORY = "META-INF/";
+  private static final short MAGIC_JAR_ID = (short) 0xCAFE;
+  private static final ExtraData[] MAGIC_JAR_ID_EXTRA_ENTRIES =
+      new ExtraData[] { new ExtraData(MAGIC_JAR_ID, new byte[0]) };
+
+  /**
+   * Adds META-INF directory through ZipCombiner with the given date and the
+   * magic jar ID.
+   *
+   * @throws IOException if {@link ZipCombiner#addDirectory(String, Date, ExtraData[])}
+   *                     throws an IOException.
+   */
+  public static void addMetaInf(ZipCombiner combiner, Date date) throws IOException {
+    combiner.addDirectory(MANIFEST_DIRECTORY, date, MAGIC_JAR_ID_EXTRA_ENTRIES);
+  }
+}