1 files changed, 46 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/crypto/CryptoUtil.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/crypto/CryptoUtil.java
new file mode 100644
index 0000000000..a4904b9285
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/crypto/CryptoUtil.java
@@ -0,0 +1,46 @@
+/*
+ * 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.crypto;
+
+import androidx.annotation.Nullable;
+
+/**
+ * Utility functions for the crypto package.
+ */
+/* package */ final class CryptoUtil {
+
+  private CryptoUtil() {}
+
+  /**
+   * Returns the hash value of the input as a long using the 64 bit FNV-1a hash function. The hash
+   * values produced by this function are less likely to collide than those produced by {@link
+   * #hashCode()}.
+   */
+  public static long getFNV64Hash(@Nullable String input) {
+    if (input == null) {
+      return 0;
+    }
+
+    long hash = 0;
+    for (int i = 0; i < input.length(); i++) {
+      hash ^= input.charAt(i);
+      // This is equivalent to hash *= 0x100000001b3 (the FNV magic prime number).
+      hash += (hash << 1) + (hash << 4) + (hash << 5) + (hash << 7) + (hash << 8) + (hash << 40);
+    }
+    return hash;
+  }
+
+}