1 files changed, 150 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/AssetDataSource.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/AssetDataSource.java
new file mode 100644
index 0000000000..70cd1de8fe
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/AssetDataSource.java
@@ -0,0 +1,150 @@
+/*
+ * 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 static org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util.castNonNull;
+
+import android.content.Context;
+import android.content.res.AssetManager;
+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.EOFException;
+import java.io.IOException;
+import java.io.InputStream;
+
+/** A {@link DataSource} for reading from a local asset. */
+public final class AssetDataSource extends BaseDataSource {
+
+  /**
+   * Thrown when an {@link IOException} is encountered reading a local asset.
+   */
+  public static final class AssetDataSourceException extends IOException {
+
+    public AssetDataSourceException(IOException cause) {
+      super(cause);
+    }
+
+  }
+
+  private final AssetManager assetManager;
+
+  @Nullable private Uri uri;
+  @Nullable private InputStream inputStream;
+  private long bytesRemaining;
+  private boolean opened;
+
+  /** @param context A context. */
+  public AssetDataSource(Context context) {
+    super(/* isNetwork= */ false);
+    this.assetManager = context.getAssets();
+  }
+
+  @Override
+  public long open(DataSpec dataSpec) throws AssetDataSourceException {
+    try {
+      uri = dataSpec.uri;
+      String path = Assertions.checkNotNull(uri.getPath());
+      if (path.startsWith("/android_asset/")) {
+        path = path.substring(15);
+      } else if (path.startsWith("/")) {
+        path = path.substring(1);
+      }
+      transferInitializing(dataSpec);
+      inputStream = assetManager.open(path, AssetManager.ACCESS_RANDOM);
+      long skipped = inputStream.skip(dataSpec.position);
+      if (skipped < dataSpec.position) {
+        // assetManager.open() returns an AssetInputStream, whose skip() implementation only skips
+        // fewer bytes than requested if the skip is beyond the end of the asset's data.
+        throw new EOFException();
+      }
+      if (dataSpec.length != C.LENGTH_UNSET) {
+        bytesRemaining = dataSpec.length;
+      } else {
+        bytesRemaining = inputStream.available();
+        if (bytesRemaining == Integer.MAX_VALUE) {
+          // assetManager.open() returns an AssetInputStream, whose available() implementation
+          // returns Integer.MAX_VALUE if the remaining length is greater than (or equal to)
+          // Integer.MAX_VALUE. We don't know the true length in this case, so treat as unbounded.
+          bytesRemaining = C.LENGTH_UNSET;
+        }
+      }
+    } catch (IOException e) {
+      throw new AssetDataSourceException(e);
+    }
+
+    opened = true;
+    transferStarted(dataSpec);
+    return bytesRemaining;
+  }
+
+  @Override
+  public int read(byte[] buffer, int offset, int readLength) throws AssetDataSourceException {
+    if (readLength == 0) {
+      return 0;
+    } else if (bytesRemaining == 0) {
+      return C.RESULT_END_OF_INPUT;
+    }
+
+    int bytesRead;
+    try {
+      int bytesToRead = bytesRemaining == C.LENGTH_UNSET ? readLength
+          : (int) Math.min(bytesRemaining, readLength);
+      bytesRead = castNonNull(inputStream).read(buffer, offset, bytesToRead);
+    } catch (IOException e) {
+      throw new AssetDataSourceException(e);
+    }
+
+    if (bytesRead == -1) {
+      if (bytesRemaining != C.LENGTH_UNSET) {
+        // End of stream reached having not read sufficient data.
+        throw new AssetDataSourceException(new EOFException());
+      }
+      return C.RESULT_END_OF_INPUT;
+    }
+    if (bytesRemaining != C.LENGTH_UNSET) {
+      bytesRemaining -= bytesRead;
+    }
+    bytesTransferred(bytesRead);
+    return bytesRead;
+  }
+
+  @Override
+  @Nullable
+  public Uri getUri() {
+    return uri;
+  }
+
+  @Override
+  public void close() throws AssetDataSourceException {
+    uri = null;
+    try {
+      if (inputStream != null) {
+        inputStream.close();
+      }
+    } catch (IOException e) {
+      throw new AssetDataSourceException(e);
+    } finally {
+      inputStream = null;
+      if (opened) {
+        opened = false;
+        transferEnded();
+      }
+    }
+  }
+
+}