/* 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; }