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 28 uint32 Crc32::GetInitialCrc32() { 29 static const uint32 kCrcInitZero = crc32(0L, nullptr, 0); 30 return kCrcInitZero; 31 } 32 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
