1 // Copyright 2018 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "absl/hash/internal/hash.h"
16
17 namespace absl {
18 ABSL_NAMESPACE_BEGIN
19 namespace hash_internal {
20
CombineLargeContiguousImpl32(uint64_t state,const unsigned char * first,size_t len)21 uint64_t CityHashState::CombineLargeContiguousImpl32(uint64_t state,
22 const unsigned char* first,
23 size_t len) {
24 while (len >= PiecewiseChunkSize()) {
25 state =
26 Mix(state, absl::hash_internal::CityHash32(reinterpret_cast<const char*>(first),
27 PiecewiseChunkSize()));
28 len -= PiecewiseChunkSize();
29 first += PiecewiseChunkSize();
30 }
31 // Handle the remainder.
32 return CombineContiguousImpl(state, first, len,
33 std::integral_constant<int, 4>{});
34 }
35
CombineLargeContiguousImpl64(uint64_t state,const unsigned char * first,size_t len)36 uint64_t CityHashState::CombineLargeContiguousImpl64(uint64_t state,
37 const unsigned char* first,
38 size_t len) {
39 while (len >= PiecewiseChunkSize()) {
40 state =
41 Mix(state, absl::hash_internal::CityHash64(reinterpret_cast<const char*>(first),
42 PiecewiseChunkSize()));
43 len -= PiecewiseChunkSize();
44 first += PiecewiseChunkSize();
45 }
46 // Handle the remainder.
47 return CombineContiguousImpl(state, first, len,
48 std::integral_constant<int, 8>{});
49 }
50
51 ABSL_CONST_INIT const void* const CityHashState::kSeed = &kSeed;
52
53 } // namespace hash_internal
54 ABSL_NAMESPACE_END
55 } // namespace absl
56