| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <crc_byte.h> |
| |
| uint8_t crc7_byte(uint8_t prev_crc, uint8_t data) |
| { |
| const uint8_t g = 0x89; |
| prev_crc ^= data; |
| for (int i = 0; i < 8; i++) { |
| if (prev_crc & 0x80) |
| prev_crc ^= g; |
| prev_crc <<= 1; |
| } |
| return prev_crc; |
| } |
| |
| uint16_t crc16_byte(uint16_t prev_crc, uint8_t data) |
| { |
| prev_crc = (uint8_t)(prev_crc >> 8)|(prev_crc << 8); |
| prev_crc ^= data; |
| prev_crc ^= (uint8_t)(prev_crc & 0xff) >> 4; |
| prev_crc ^= (prev_crc << 8) << 4; |
| prev_crc ^= ((prev_crc & 0xff) << 4) << 1; |
| return prev_crc; |
| } |
| |
| uint32_t crc32_byte(uint32_t prev_crc, uint8_t data) |
| { |
| prev_crc ^= (uint32_t)data << 24; |
| |
| for (int i = 0; i < 8; i++) { |
| if ((prev_crc & 0x80000000UL) != 0) |
| prev_crc = ((prev_crc << 1) ^ 0x04C11DB7UL); |
| else |
| prev_crc <<= 1; |
| } |
| |
| return prev_crc; |
| } |