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/usr/include/bobcat/hmacbuf is in libbobcat-dev 3.19.01-1ubuntu1.

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#ifndef INCLUDED_HMACBUF_
#define INCLUDED_HMACBUF_

#include <iosfwd>
#include <streambuf>

namespace FBB
{

struct HMacBufImp;

class HMacBuf: public std::streambuf
{
    friend std::ostream &operator<<(std::ostream &out, 
                                    HMacBuf const &hmacbuf);

    HMacBufImp *d_pimpl;

    public:
        HMacBuf(std::string const &key, 
                char const *type, size_t bufsize = 1024);

        virtual ~HMacBuf();

        void open();
        void close();

        std::string const &hash() const;

    private:
        virtual int overflow(int c);
};

std::ostream &operator<<(std::ostream &out, HMacBuf const &hmacbuf);

}   // FBB
        
#endif