1 files changed, 54 insertions, 0 deletions
diff --git a/src/java_tools/singlejar/java/com/google/devtools/build/zip/CountingOutputStream.java b/src/java_tools/singlejar/java/com/google/devtools/build/zip/CountingOutputStream.java
new file mode 100644
index 0000000000..a08159ff14
--- /dev/null
+++ b/src/java_tools/singlejar/java/com/google/devtools/build/zip/CountingOutputStream.java
@@ -0,0 +1,54 @@
+// Copyright 2015 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.zip;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/** An OutputStream that counts the number of bytes written. */
+final class CountingOutputStream extends FilterOutputStream {
+
+  private long count;
+
+  /**
+   * Wraps another output stream, counting the number of bytes written.
+   *
+   * @param out the output stream to be wrapped
+   */
+  public CountingOutputStream(OutputStream out) {
+    super(out);
+  }
+
+  /** Returns the number of bytes written. */
+  public long getCount() {
+    return count;
+  }
+
+  @Override public void write(int b) throws IOException {
+    out.write(b);
+    count++;
+  }
+
+  @Override public void write(byte[] b) throws IOException {
+    out.write(b);
+    count += b.length;
+  }
+
+  @Override public void write(byte[] b, int off, int len) throws IOException {
+    out.write(b, off, len);
+    count += len;
+  }
+}
+\ No newline at end of file