Function crc32File

src/core/sd_functions.cpp:456–469

}

String crc32File(FS &fs, String filepath) {
    if (!fs.exists(filepath)) return "";
    String txt = readSmallFile(fs, filepath);
    // derived from
    // https://techoverflow.net/2022/08/05/how-to-compute-crc32-with-ethernet-polynomial-0x04c11db7-on-esp32-crc-h/
    uint32_t romCRC =
        (~esp_rom_crc32_le((uint32_t)~(0xffffffff), (const uint8_t *)txt.c_str(), txt.length())) ^ 0xffffffff;

    char s[18] = {0};
    char crcBytes[4] = {0};
    memcpy(crcBytes, &romCRC, sizeof(uint32_t));
    snprintf(s, sizeof(s), "%02X%02X%02X%02X\n", crcBytes[3], crcBytes[2], crcBytes[1], crcBytes[0]);
    return (String(s));
}

/***************************************************************************************
** Function name: sortList