1 /* 2 * Copyright (C) 2020 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 #ifndef CHPP_CRC_H_ 18 #define CHPP_CRC_H_ 19 20 #include <stddef.h> 21 #include <stdint.h> 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 /** 28 * Calculates IEEE CRC-32, initialized to (~crc), on an input data buffer. 29 * 30 * It is expected that the implementation be optimized based on individual 31 * platforms, e.g. by reusing HW/SW optimized CRC functionality. 32 * 33 * @param crc CRC initialization value. This may be used to calculate a CRC on 34 * daisy-chained input data. Otherwise, it can be set to zero to initialize to 35 * 0xFFFFFFFF. 36 * @param buf Input data. 37 * @param len Input data length in bytes. 38 * 39 * @return Calculated CRC-32. 40 */ 41 uint32_t chppCrc32(uint32_t crc, const uint8_t *buf, size_t len); 42 43 #ifdef __cplusplus 44 } 45 #endif 46 47 #endif // CHPP_CRC_H_ 48