1 files changed, 105 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/TeeDataSource.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/TeeDataSource.java
new file mode 100644
index 0000000000..c6063b916f
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/TeeDataSource.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2016 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.mozilla.thirdparty.com.google.android.exoplayer2.upstream;
+
+import android.net.Uri;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Tees data into a {@link DataSink} as the data is read.
+ */
+public final class TeeDataSource implements DataSource {
+
+  private final DataSource upstream;
+  private final DataSink dataSink;
+
+  private boolean dataSinkNeedsClosing;
+  private long bytesRemaining;
+
+  /**
+   * @param upstream The upstream {@link DataSource}.
+   * @param dataSink The {@link DataSink} into which data is written.
+   */
+  public TeeDataSource(DataSource upstream, DataSink dataSink) {
+    this.upstream = Assertions.checkNotNull(upstream);
+    this.dataSink = Assertions.checkNotNull(dataSink);
+  }
+
+  @Override
+  public void addTransferListener(TransferListener transferListener) {
+    upstream.addTransferListener(transferListener);
+  }
+
+  @Override
+  public long open(DataSpec dataSpec) throws IOException {
+    bytesRemaining = upstream.open(dataSpec);
+    if (bytesRemaining == 0) {
+      return 0;
+    }
+    if (dataSpec.length == C.LENGTH_UNSET && bytesRemaining != C.LENGTH_UNSET) {
+      // Reconstruct dataSpec in order to provide the resolved length to the sink.
+      dataSpec = dataSpec.subrange(0, bytesRemaining);
+    }
+    dataSinkNeedsClosing = true;
+    dataSink.open(dataSpec);
+    return bytesRemaining;
+  }
+
+  @Override
+  public int read(byte[] buffer, int offset, int max) throws IOException {
+    if (bytesRemaining == 0) {
+      return C.RESULT_END_OF_INPUT;
+    }
+    int bytesRead = upstream.read(buffer, offset, max);
+    if (bytesRead > 0) {
+      // TODO: Consider continuing even if writes to the sink fail.
+      dataSink.write(buffer, offset, bytesRead);
+      if (bytesRemaining != C.LENGTH_UNSET) {
+        bytesRemaining -= bytesRead;
+      }
+    }
+    return bytesRead;
+  }
+
+  @Override
+  @Nullable
+  public Uri getUri() {
+    return upstream.getUri();
+  }
+
+  @Override
+  public Map<String, List<String>> getResponseHeaders() {
+    return upstream.getResponseHeaders();
+  }
+
+  @Override
+  public void close() throws IOException {
+    try {
+      upstream.close();
+    } finally {
+      if (dataSinkNeedsClosing) {
+        dataSinkNeedsClosing = false;
+        dataSink.close();
+      }
+    }
+  }
+
+}