Encode binary file base64

echo_base64_encode

inline char* base64_encode(const unsigned char* data, int input_length, int* output_length)
{
    static char encoding_table[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
                                    'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
                                    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
                                    'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
                                    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
                                    'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
                                    'w', 'x', 'y', 'z', '0', '1', '2', '3',
                                    '4', '5', '6', '7', '8', '9', '+', '/'
                                   };

    static int mod_table[] = {0, 2, 1};


    *output_length = (size_t)(4.0 * ceil((double) input_length / 3.0));
    char* encoded_data = malloc(*output_length);

    for(int i = 0, j = 0; i < input_length;)
    {
        uint32_t octet_a = i < input_length ? data[i++] : 0;
        uint32_t octet_b = i < input_length ? data[i++] : 0;
        uint32_t octet_c = i < input_length ? data[i++] : 0;

        uint32_t triple = (octet_a << 0x10) + (octet_b << 0x08) + octet_c;

        encoded_data[j++] = encoding_table[(triple >> 3 * 6) & 0x3F];
        encoded_data[j++] = encoding_table[(triple >> 2 * 6) & 0x3F];
        encoded_data[j++] = encoding_table[(triple >> 1 * 6) & 0x3F];
        encoded_data[j++] = encoding_table[(triple >> 0 * 6) & 0x3F];
    }

    for(int i = 0; i < mod_table[input_length % 3]; i++)
        encoded_data[*output_length - 1 - i] = '=';
    return encoded_data;
}

inline void echo_base64_encode(const char*, const char* path, void* app_, node<message*>** errors)
{
    int size;
    unsigned char* buffer = load_binary(path, &size, errors);
    if(*errors)
    {
        push_message(errors, 0, 0, 1, __FILE__, __FUNCTION__, __LINE__, "bad path: %s", path);
        return;
    }

    int len;
    char* str = base64_encode(buffer, size, &len);

    char ch[LARGE_TEXT_BUFFER];
    strncpy(ch, str, len);
    ch[len] = '\0';
    fprintf(stdout, "imageObj.src = \"data:image/png;base64,%s\"\n", ch);

    free(str);
    free(buffer);
}