1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "lang_id/common/math/checksum.h"
18
19 // Though we use the same zlib header on all platforms, the implementation used
20 // is from NDK on android and from third_party/zlib on iOS/linux. See BUILD
21 // rule.
22 #include <zlib.h>
23
24 namespace libtextclassifier3 {
25 namespace mobile {
26
27 // static
GetInitialCrc32()28 uint32 Crc32::GetInitialCrc32() {
29 static const uint32 kCrcInitZero = crc32(0L, nullptr, 0);
30 return kCrcInitZero;
31 }
32
Update(const char * str,int len)33 void Crc32::Update(const char *str, int len) {
34 if (str == nullptr || len == 0) {
35 return;
36 }
37 current_ = crc32(current_,
38 reinterpret_cast<const unsigned char *>(str),
39 len);
40 }
41
42 } // namespace mobile
43 } // namespace nlp_saft
44