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/*
* 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;
}
}
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