Function encodeBase64

include/engine/base64.hpp:44–69

Encodes a chunk of memory to Base64.

// Encodes a chunk of memory to Base64.
inline std::string encodeBase64(const unsigned char *first, std::size_t size)
{
    BOOST_ASSERT(size > 0);

    std::string encoded;
    encoded.reserve(((size + 2) / 3) * 4);

    auto padding = (3 - size % 3) % 3;

    BOOST_ASSERT(padding == 0 || padding == 1 || padding == 2);

    for (auto itr = detail::Base64FromBinary(first); itr != detail::Base64FromBinary(first + size);
         ++itr)
    {
        encoded.push_back(*itr);
    }

    for (size_t index = 0; index < padding; ++index)
    {
        encoded.push_back('=');
    }

    BOOST_ASSERT(encoded.size() == (size + 2) / 3 * 4);

    return encoded;
}

// C++11 standard 3.9.1/1: Plain char, signed char, and unsigned char are three distinct types