Method base64Encode

src/jlsrtp.cpp:907–963

}

std::string JLSRTP::base64Encode(std::vector<unsigned char> const& s)
{
    int i = 0;
    int j = 0;
    unsigned char char_array_3[3];
    unsigned char char_array_4[4];
    unsigned char const* bytes_to_encode = &s.front();
    unsigned int in_len = s.size();
    std::string ret;
    // Reserve enough space in 'ret' to avoid multiple allocations.
    // In Base64, every 3 bytes of binary data become 4 bytes of ASCII text.
    // Round up for potential padding.
    ret.reserve(((in_len + 2) / 3) * 4);

    while (in_len--)
    {
        char_array_3[i++] = *(bytes_to_encode++);
        if (i == 3)
        {
            char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
            char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
            char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
            char_array_4[3] = char_array_3[2] & 0x3f;

            for(i = 0; (i <4) ; i++)
            {
                ret += base64Chars[char_array_4[i]];
            }
            i = 0;
        }
    }

    if (i)
    {
        for(j = i; j < 3; j++)
        {
            char_array_3[j] = '\0';
        }

        char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
        char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
        char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
        char_array_4[3] = char_array_3[2] & 0x3f;

        for (j = 0; (j < i + 1); j++)
        {
            ret += base64Chars[char_array_4[j]];
        }

        while((i++ < 3))
        {
            ret += '=';
        }
    }

    return ret;
}