Function string_base64_encode

string/std_string.c:3065–3107

* @brief Encodes a String object into Base64 format. * * This function takes a String object and encodes its content into Base64 format. * The encoded result is returned as a new String object. If the input String object * or its dataStr is NULL, the function returns NULL and logs an error. * * @param input The String object to encode. Must not be NULL. * * @return A new String object co

 * @return A new String object containing the Base64-encoded data, or NULL if an error occurs.
 */
String* string_base64_encode(const String *input) {
    STRING_LOG("[string_base64_encode]: Function start.");
    
    if (input == NULL) {
        STRING_LOG("[string_base64_encode]: Error - The String object is NULL.");
        return NULL;
    }
    if (input->dataStr == NULL) {
        STRING_LOG("[string_base64_encode]: Error - The dataStr of String object is NULL.");
        return NULL;
    }

    String *encoded = string_create("");
    if (encoded == NULL) {
        STRING_LOG("[string_base64_encode]: Error - Failed to create encoded String object.");
        return NULL;
    }

    int val = 0, valb = -6;
    size_t i;
    for (i = 0; i < input->size; i++) {
        unsigned char c = input->dataStr[i];
        val = (val << 8) + c;
        valb += 8;
        while (valb >= 0) {
            string_push_back(encoded, base64_chars[(val >> valb) & 0x3F]);
            valb -= 6;
        }
    }

    if (valb > -6) {
        string_push_back(encoded, base64_chars[((val << 8) >> (valb + 8)) & 0x3F]);
    }

    while (encoded->size % 4) {
        string_push_back(encoded, '=');
    }

    STRING_LOG("[string_base64_encode]: Successfully encoded input.");
    STRING_LOG("[string_base64_encode]: Function end.");
    
    return encoded;
}


/**