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/usr/include/bobcat/base64streambufbase is in libbobcat-dev 3.23.01-1.

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#ifndef INCLUDED_BOBCAT_BASE64STREAMBUFBASE_
#define INCLUDED_BOBCAT_BASE64STREAMBUFBASE_

#include <istream>
#include <string>

#include <bobcat/ifilterstreambuf>

namespace FBB
{

namespace IUO   // the facilities defined here are not further documented:
{               // the Base64StreambufBase class defined below should be
                // used by IBase64Streambuf only.

class Base64StreambufBase: public FBB::IFilterStreambuf
{
    std::istream &d_in;
    bool (Base64StreambufBase::*d_action)();
    size_t d_bufSize;
    std::string d_buffer;
    bool d_allDone = false;

    static std::string const s_tabStr;

    public:
        Base64StreambufBase(std::istream &in, size_t bufSize);

    protected:
        void doEncrypt();
        void doDecrypt();

    private:
        bool filter(char const **srcBegin, char const **srcEnd) override;
        bool encrypt(); // false means: don't call again, but there 
                        // may still be input waiting in d_buffer
        bool decrypt();

        template <int from, int size, int shl = 0>
        static int bits(int value);

        static size_t indexOf(int ch);

};

template <int from, int size, int shl>
inline int Base64StreambufBase::bits(int value)
{
    return value == EOF ? 0 :
            (value & ((1 << (from + size)) - 1)) >> from << shl;
}

}   // IUO
}   // FBB        

#endif