| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * 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 |
| * |
| * http://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. |
| */ |
| #ifndef NOS_TRANSPORT_CRC16_H |
| #define NOS_TRANSPORT_CRC16_H |
| |
| #include <stdint.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * Calculate the CRC-16 of the data. |
| * |
| * This uses the CRC-16-IBM variant: 0x8005 (x^16 + x^15 + x^2 + 1) |
| */ |
| uint16_t crc16(const void *buf, uint32_t len); |
| |
| /** |
| * Calculates the CRC-16 of the data to extend the given crc. |
| * |
| * CRC is a linear function so crc16( x | y ) == crc16(x, crc16(y)). |
| * |
| * This uses the CRC-16-IBM variant: 0x8005 (x^16 + x^15 + x^2 + 1) |
| */ |
| uint16_t crc16_update(const void *buf, uint32_t len, uint16_t crc); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* NOS_TRANSPORT_CRC16_H */ |