// Copyright 2023 Google LLC
//
// 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.

/// Implementation compatible with Java's
/// [`Object.hashCode()`](https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html#hashCode()).
pub(crate) fn hash_code(input: &[u8]) -> i32 {
    input.iter().fold(1_i32, |acc, &byte| 31_i32.wrapping_mul(acc).wrapping_add(byte as i8 as i32))
}
