Function hashFile

FluidNC/src/HashFS.cpp:15–53

}

static Error hashFile(const std::filesystem::path& ipath, std::string& str) {  // No ESP command
    uint8_t shaResult[32];

    try {
        FileStream inFile { ipath.string(), "r" };
        uint8_t    buf[512];
        size_t     len;

#ifdef WITH_MBEDTLS
        mbedtls_md_context_t ctx;

        mbedtls_md_init(&ctx);
        mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 0);
        mbedtls_md_starts(&ctx);
        while ((len = inFile.read(buf, 512)) > 0) {
            mbedtls_md_update(&ctx, buf, len);
            feed_watchdog();
        }
        mbedtls_md_finish(&ctx, shaResult);
        mbedtls_md_free(&ctx);
#else
        // Use the first 32 bytes of the file as a not-very-good "hash"
        inFile.read(shaResult, 32);
#endif
    } catch (const Error err) {
        log_debug("Cannot hash file " << ipath.string());
        return Error::FsFailedOpenFile;
    }

    str = '"';
    for (int i = 0; i < 32; i++) {
        uint8_t b = shaResult[i];
        str += hexNibble(b >> 4);
        str += hexNibble(b);
    }
    str += '"';

    return Error::Ok;
}

void HashFS::report_change() {
    log_msg("Files changed");