1 files changed, 173 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/ContentDataSource.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/ContentDataSource.java
new file mode 100644
index 0000000000..b73d9d6375
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/ContentDataSource.java
@@ -0,0 +1,173 @@
+/*
+ * 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.ContentResolver;
+import android.content.Context;
+import android.content.res.AssetFileDescriptor;
+import android.net.Uri;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import java.io.EOFException;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+
+/** A {@link DataSource} for reading from a content URI. */
+public final class ContentDataSource extends BaseDataSource {
+
+  /**
+   * Thrown when an {@link IOException} is encountered reading from a content URI.
+   */
+  public static class ContentDataSourceException extends IOException {
+
+    public ContentDataSourceException(IOException cause) {
+      super(cause);
+    }
+
+  }
+
+  private final ContentResolver resolver;
+
+  @Nullable private Uri uri;
+  @Nullable private AssetFileDescriptor assetFileDescriptor;
+  @Nullable private FileInputStream inputStream;
+  private long bytesRemaining;
+  private boolean opened;
+
+  /**
+   * @param context A context.
+   */
+  public ContentDataSource(Context context) {
+    super(/* isNetwork= */ false);
+    this.resolver = context.getContentResolver();
+  }
+
+  @Override
+  public long open(DataSpec dataSpec) throws ContentDataSourceException {
+    try {
+      Uri uri = dataSpec.uri;
+      this.uri = uri;
+
+      transferInitializing(dataSpec);
+      AssetFileDescriptor assetFileDescriptor = resolver.openAssetFileDescriptor(uri, "r");
+      this.assetFileDescriptor = assetFileDescriptor;
+      if (assetFileDescriptor == null) {
+        throw new FileNotFoundException("Could not open file descriptor for: " + uri);
+      }
+      FileInputStream inputStream = new FileInputStream(assetFileDescriptor.getFileDescriptor());
+      this.inputStream = inputStream;
+
+      long assetStartOffset = assetFileDescriptor.getStartOffset();
+      long skipped = inputStream.skip(assetStartOffset + dataSpec.position) - assetStartOffset;
+      if (skipped != dataSpec.position) {
+        // We expect the skip to be satisfied in full. If it isn't then we're probably trying to
+        // skip beyond the end of the data.
+        throw new EOFException();
+      }
+      if (dataSpec.length != C.LENGTH_UNSET) {
+        bytesRemaining = dataSpec.length;
+      } else {
+        long assetFileDescriptorLength = assetFileDescriptor.getLength();
+        if (assetFileDescriptorLength == AssetFileDescriptor.UNKNOWN_LENGTH) {
+          // The asset must extend to the end of the file. If FileInputStream.getChannel().size()
+          // returns 0 then the remaining length cannot be determined.
+          FileChannel channel = inputStream.getChannel();
+          long channelSize = channel.size();
+          bytesRemaining = channelSize == 0 ? C.LENGTH_UNSET : channelSize - channel.position();
+        } else {
+          bytesRemaining = assetFileDescriptorLength - skipped;
+        }
+      }
+    } catch (IOException e) {
+      throw new ContentDataSourceException(e);
+    }
+
+    opened = true;
+    transferStarted(dataSpec);
+
+    return bytesRemaining;
+  }
+
+  @Override
+  public int read(byte[] buffer, int offset, int readLength) throws ContentDataSourceException {
+    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 ContentDataSourceException(e);
+    }
+
+    if (bytesRead == -1) {
+      if (bytesRemaining != C.LENGTH_UNSET) {
+        // End of stream reached having not read sufficient data.
+        throw new ContentDataSourceException(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;
+  }
+
+  @SuppressWarnings("Finally")
+  @Override
+  public void close() throws ContentDataSourceException {
+    uri = null;
+    try {
+      if (inputStream != null) {
+        inputStream.close();
+      }
+    } catch (IOException e) {
+      throw new ContentDataSourceException(e);
+    } finally {
+      inputStream = null;
+      try {
+        if (assetFileDescriptor != null) {
+          assetFileDescriptor.close();
+        }
+      } catch (IOException e) {
+        throw new ContentDataSourceException(e);
+      } finally {
+        assetFileDescriptor = null;
+        if (opened) {
+          opened = false;
+          transferEnded();
+        }
+      }
+    }
+  }
+
+}