1 files changed, 41 insertions, 0 deletions
diff --git a/absl/hash/internal/city_crc.h b/absl/hash/internal/city_crc.h
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+++ b/absl/hash/internal/city_crc.h
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+// Copyright 2018 The Abseil Authors.
+//
+// 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.
+//
+// This file declares the subset of the CityHash functions that require
+// _mm_crc32_u64().  See the CityHash README for details.
+//
+// Functions in the CityHash family are not suitable for cryptography.
+
+#ifndef ABSL_HASH_INTERNAL_CITY_CRC_H_
+#define ABSL_HASH_INTERNAL_CITY_CRC_H_
+
+#include "absl/hash/internal/city.h"
+
+namespace absl {
+namespace hash_internal {
+
+// Hash function for a byte array.
+uint128 CityHashCrc128(const char *s, size_t len);
+
+// Hash function for a byte array.  For convenience, a 128-bit seed is also
+// hashed into the result.
+uint128 CityHashCrc128WithSeed(const char *s, size_t len, uint128 seed);
+
+// Hash function for a byte array.  Sets result[0] ... result[3].
+void CityHashCrc256(const char *s, size_t len, uint64_t *result);
+
+}  // namespace hash_internal
+}  // namespace absl
+
+#endif  // ABSL_HASH_INTERNAL_CITY_CRC_H_