Repo created

TMessagesProj/jni/voip/webrtc/absl/hash/internal/hash.cc

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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
+//
+//      https://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.
+
+#include "absl/hash/internal/hash.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <type_traits>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/hash/internal/low_level_hash.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace hash_internal {
+
+uint64_t MixingHashState::CombineLargeContiguousImpl32(
+    uint64_t state, const unsigned char* first, size_t len) {
+  while (len >= PiecewiseChunkSize()) {
+    state = Mix(
+        state ^ hash_internal::CityHash32(reinterpret_cast<const char*>(first),
+                                          PiecewiseChunkSize()),
+        kMul);
+    len -= PiecewiseChunkSize();
+    first += PiecewiseChunkSize();
+  }
+  // Handle the remainder.
+  return CombineContiguousImpl(state, first, len,
+                               std::integral_constant<int, 4>{});
+}
+
+uint64_t MixingHashState::CombineLargeContiguousImpl64(
+    uint64_t state, const unsigned char* first, size_t len) {
+  while (len >= PiecewiseChunkSize()) {
+    state = Mix(state ^ Hash64(first, PiecewiseChunkSize()), kMul);
+    len -= PiecewiseChunkSize();
+    first += PiecewiseChunkSize();
+  }
+  // Handle the remainder.
+  return CombineContiguousImpl(state, first, len,
+                               std::integral_constant<int, 8>{});
+}
+
+ABSL_CONST_INIT const void* const MixingHashState::kSeed = &kSeed;
+
+#ifdef ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL
+constexpr uint64_t MixingHashState::kStaticRandomData[];
+#endif
+
+uint64_t MixingHashState::LowLevelHashImpl(const unsigned char* data,
+                                           size_t len) {
+  return LowLevelHashLenGt16(data, len, Seed(), &kStaticRandomData[0]);
+}
+
+}  // namespace hash_internal
+ABSL_NAMESPACE_END
+}  // namespace absl