1 files changed, 107 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/DataSourceInputStream.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/DataSourceInputStream.java
new file mode 100644
index 0000000000..c25ba4c10a
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/DataSourceInputStream.java
@@ -0,0 +1,107 @@
+/*
+ * 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 androidx.annotation.NonNull;
+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.io.InputStream;
+
+/**
+ * Allows data corresponding to a given {@link DataSpec} to be read from a {@link DataSource} and
+ * consumed through an {@link InputStream}.
+ */
+public final class DataSourceInputStream extends InputStream {
+
+  private final DataSource dataSource;
+  private final DataSpec dataSpec;
+  private final byte[] singleByteArray;
+
+  private boolean opened = false;
+  private boolean closed = false;
+  private long totalBytesRead;
+
+  /**
+   * @param dataSource The {@link DataSource} from which the data should be read.
+   * @param dataSpec The {@link DataSpec} defining the data to be read from {@code dataSource}.
+   */
+  public DataSourceInputStream(DataSource dataSource, DataSpec dataSpec) {
+    this.dataSource = dataSource;
+    this.dataSpec = dataSpec;
+    singleByteArray = new byte[1];
+  }
+
+  /**
+   * Returns the total number of bytes that have been read or skipped.
+   */
+  public long bytesRead() {
+    return totalBytesRead;
+  }
+
+  /**
+   * Optional call to open the underlying {@link DataSource}.
+   * <p>
+   * Calling this method does nothing if the {@link DataSource} is already open. Calling this
+   * method is optional, since the read and skip methods will automatically open the underlying
+   * {@link DataSource} if it's not open already.
+   *
+   * @throws IOException If an error occurs opening the {@link DataSource}.
+   */
+  public void open() throws IOException {
+    checkOpened();
+  }
+
+  @Override
+  public int read() throws IOException {
+    int length = read(singleByteArray);
+    return length == -1 ? -1 : (singleByteArray[0] & 0xFF);
+  }
+
+  @Override
+  public int read(@NonNull byte[] buffer) throws IOException {
+    return read(buffer, 0, buffer.length);
+  }
+
+  @Override
+  public int read(@NonNull byte[] buffer, int offset, int length) throws IOException {
+    Assertions.checkState(!closed);
+    checkOpened();
+    int bytesRead = dataSource.read(buffer, offset, length);
+    if (bytesRead == C.RESULT_END_OF_INPUT) {
+      return -1;
+    } else {
+      totalBytesRead += bytesRead;
+      return bytesRead;
+    }
+  }
+
+  @Override
+  public void close() throws IOException {
+    if (!closed) {
+      dataSource.close();
+      closed = true;
+    }
+  }
+
+  private void checkOpened() throws IOException {
+    if (!opened) {
+      dataSource.open(dataSpec);
+      opened = true;
+    }
+  }
+
+}