1 files changed, 199 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/RawResourceDataSource.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/RawResourceDataSource.java
new file mode 100644
index 0000000000..ec5263d8ac
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/RawResourceDataSource.java
@@ -0,0 +1,199 @@
+/*
+ * 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.AssetFileDescriptor;
+import android.content.res.Resources;
+import android.net.Uri;
+import android.text.TextUtils;
+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.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * A {@link DataSource} for reading a raw resource inside the APK.
+ *
+ * <p>URIs supported by this source are of the form {@code rawresource:///rawResourceId}, where
+ * rawResourceId is the integer identifier of a raw resource. {@link #buildRawResourceUri(int)} can
+ * be used to build {@link Uri}s in this format.
+ */
+public final class RawResourceDataSource extends BaseDataSource {
+
+  /**
+   * Thrown when an {@link IOException} is encountered reading from a raw resource.
+   */
+  public static class RawResourceDataSourceException extends IOException {
+    public RawResourceDataSourceException(String message) {
+      super(message);
+    }
+
+    public RawResourceDataSourceException(IOException e) {
+      super(e);
+    }
+  }
+
+  /**
+   * Builds a {@link Uri} for the specified raw resource identifier.
+   *
+   * @param rawResourceId A raw resource identifier (i.e. a constant defined in {@code R.raw}).
+   * @return The corresponding {@link Uri}.
+   */
+  public static Uri buildRawResourceUri(int rawResourceId) {
+    return Uri.parse(RAW_RESOURCE_SCHEME + ":///" + rawResourceId);
+  }
+
+  /** The scheme part of a raw resource URI. */
+  public static final String RAW_RESOURCE_SCHEME = "rawresource";
+
+  private final Resources resources;
+
+  @Nullable private Uri uri;
+  @Nullable private AssetFileDescriptor assetFileDescriptor;
+  @Nullable private InputStream inputStream;
+  private long bytesRemaining;
+  private boolean opened;
+
+  /**
+   * @param context A context.
+   */
+  public RawResourceDataSource(Context context) {
+    super(/* isNetwork= */ false);
+    this.resources = context.getResources();
+  }
+
+  @Override
+  public long open(DataSpec dataSpec) throws RawResourceDataSourceException {
+    try {
+      Uri uri = dataSpec.uri;
+      this.uri = uri;
+      if (!TextUtils.equals(RAW_RESOURCE_SCHEME, uri.getScheme())) {
+        throw new RawResourceDataSourceException("URI must use scheme " + RAW_RESOURCE_SCHEME);
+      }
+
+      int resourceId;
+      try {
+        resourceId = Integer.parseInt(Assertions.checkNotNull(uri.getLastPathSegment()));
+      } catch (NumberFormatException e) {
+        throw new RawResourceDataSourceException("Resource identifier must be an integer.");
+      }
+
+      transferInitializing(dataSpec);
+      AssetFileDescriptor assetFileDescriptor = resources.openRawResourceFd(resourceId);
+      this.assetFileDescriptor = assetFileDescriptor;
+      if (assetFileDescriptor == null) {
+        throw new RawResourceDataSourceException("Resource is compressed: " + uri);
+      }
+      FileInputStream inputStream = new FileInputStream(assetFileDescriptor.getFileDescriptor());
+      this.inputStream = inputStream;
+
+      inputStream.skip(assetFileDescriptor.getStartOffset());
+      long skipped = inputStream.skip(dataSpec.position);
+      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 the length is UNKNOWN_LENGTH then the asset extends to the end of the file.
+        bytesRemaining = assetFileDescriptorLength == AssetFileDescriptor.UNKNOWN_LENGTH
+            ? C.LENGTH_UNSET : (assetFileDescriptorLength - dataSpec.position);
+      }
+    } catch (IOException e) {
+      throw new RawResourceDataSourceException(e);
+    }
+
+    opened = true;
+    transferStarted(dataSpec);
+
+    return bytesRemaining;
+  }
+
+  @Override
+  public int read(byte[] buffer, int offset, int readLength) throws RawResourceDataSourceException {
+    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 RawResourceDataSourceException(e);
+    }
+
+    if (bytesRead == -1) {
+      if (bytesRemaining != C.LENGTH_UNSET) {
+        // End of stream reached having not read sufficient data.
+        throw new RawResourceDataSourceException(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 RawResourceDataSourceException {
+    uri = null;
+    try {
+      if (inputStream != null) {
+        inputStream.close();
+      }
+    } catch (IOException e) {
+      throw new RawResourceDataSourceException(e);
+    } finally {
+      inputStream = null;
+      try {
+        if (assetFileDescriptor != null) {
+          assetFileDescriptor.close();
+        }
+      } catch (IOException e) {
+        throw new RawResourceDataSourceException(e);
+      } finally {
+        assetFileDescriptor = null;
+        if (opened) {
+          opened = false;
+          transferEnded();
+        }
+      }
+    }
+  }
+
+}