/* * SPDX-License-Identifier: MIT * * Copyright (C) 2025 OpenMV, LLC. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "omv_crc.h" static const uint16_t crc16_table[256] = { 0x0000, 0xBAAD, 0xCFF7, 0x755A, 0x2543, 0x9FEE, 0xEAB4, 0x5019, 0x4A86, 0xF02B, 0x8571, 0x3FDC, 0x6FC5, 0xD568, 0xA032, 0x1A9F, 0x950C, 0x2FA1, 0x5AFB, 0xE056, 0xB04F, 0x0AE2, 0x7FB8, 0xC515, 0xDF8A, 0x6527, 0x107D, 0xAAD0, 0xFAC9, 0x4064, 0x353E, 0x8F93, 0x90B5, 0x2A18, 0x5F42, 0xE5EF, 0xB5F6, 0x0F5B, 0x7A01, 0xC0AC, 0xDA33, 0x609E, 0x15C4, 0xAF69, 0xFF70, 0x45DD, 0x3087, 0x8A2A, 0x05B9, 0xBF14, 0xCA4E, 0x70E3, 0x20FA, 0x9A57, 0xEF0D, 0x55A0, 0x4F3F, 0xF592, 0x80C8, 0x3A65, 0x6A7C, 0xD0D1, 0xA58B, 0x1F26, 0x9BC7, 0x216A, 0x5430, 0xEE9D, 0xBE84, 0x0429, 0x7173, 0xCBDE, 0xD141, 0x6BEC, 0x1EB6, 0xA41B, 0xF402, 0x4EAF, 0x3BF5, 0x8158, 0x0ECB, 0xB466, 0xC13C, 0x7B91, 0x2B88, 0x9125, 0xE47F, 0x5ED2, 0x444D, 0xFEE0, 0x8BBA, 0x3117, 0x610E, 0xDBA3, 0xAEF9, 0x1454, 0x0B72, 0xB1DF, 0xC485, 0x7E28, 0x2E31, 0x949C, 0xE1C6, 0x5B6B, 0x41F4, 0xFB59, 0x8E03, 0x34AE, 0x64B7, 0xDE1A, 0xAB40, 0x11ED, 0x9E7E, 0x24D3, 0x5189, 0xEB24, 0xBB3D, 0x0190, 0x74CA, 0xCE67, 0xD4F8, 0x6E55, 0x1B0F, 0xA1A2, 0xF1BB, 0x4B16, 0x3E4C, 0x84E1, 0x8D23, 0x378E, 0x42D4, 0xF879, 0xA860, 0x12CD, 0x6797, 0xDD3A, 0xC7A5, 0x7D08, 0x0852, 0xB2FF, 0xE2E6, 0x584B, 0x2D11, 0x97BC, 0x182F, 0xA282, 0xD7D8, 0x6D75, 0x3D6C, 0x87C1, 0xF29B, 0x4836, 0x52A9, 0xE804, 0x9D5E, 0x27F3, 0x77EA, 0xCD47, 0xB81D, 0x02B0, 0x1D96, 0xA73B, 0xD261, 0x68CC, 0x38D5, 0x8278, 0xF722, 0x4D8F, 0x5710, 0xEDBD, 0x98E7, 0x224A, 0x7253, 0xC8FE, 0xBDA4, 0x0709, 0x889A, 0x3237, 0x476D, 0xFDC0, 0xADD9, 0x1774, 0x622E, 0xD883, 0xC21C, 0x78B1, 0x0DEB, 0xB746, 0xE75F, 0x5DF2, 0x28A8, 0x9205, 0x16E4, 0xAC49, 0xD913, 0x63BE, 0x33A7, 0x890A, 0xFC50, 0x46FD, 0x5C62, 0xE6CF, 0x9395, 0x2938, 0x7921, 0xC38C, 0xB6D6, 0x0C7B, 0x83E8, 0x3945, 0x4C1F, 0xF6B2, 0xA6AB, 0x1C06, 0x695C, 0xD3F1, 0xC96E, 0x73C3, 0x0699, 0xBC34, 0xEC2D, 0x5680, 0x23DA, 0x9977, 0x8651, 0x3CFC, 0x49A6, 0xF30B, 0xA312, 0x19BF, 0x6CE5, 0xD648, 0xCCD7, 0x767A, 0x0320, 0xB98D, 0xE994, 0x5339, 0x2663, 0x9CCE, 0x135D, 0xA9F0, 0xDCAA, 0x6607, 0x361E, 0x8CB3, 0xF9E9, 0x4344, 0x59DB, 0xE376, 0x962C, 0x2C81, 0x7C98, 0xC635, 0xB36F, 0x09C2 }; __attribute__((weak)) void omv_crc_init(void) { } __attribute__((weak)) omv_crc_t omv_crc_start(const void *buf, size_t size) { const uint8_t *data = (const uint8_t *)buf; omv_crc_t crc = OMV_CRC_INIT; for (size_t i = 0; i < size; i++) { uint8_t index = (crc >> 8) ^ data[i]; crc = (crc << 8) ^ crc16_table[index]; } return crc; } __attribute__((weak)) omv_crc_t omv_crc_update(omv_crc_t crc, const void *buf, size_t size) { const uint8_t *data = (const uint8_t *)buf; for (size_t i = 0; i < size; i++) { uint8_t index = (crc >> 8) ^ data[i]; crc = (crc << 8) ^ crc16_table[index]; } return crc; }