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#pragma once 
 
#include <library/cpp/openssl/holders/bio.h>
 
namespace NOpenSSL { 
 
class TAbstractIO { 
public: 
    TAbstractIO(); 
    virtual ~TAbstractIO(); 
 
    virtual int Write(const char* data, size_t dlen, size_t* written) = 0; 
    virtual int Read(char* data, size_t dlen, size_t* readbytes) = 0; 
    virtual int Puts(const char* buf) = 0; 
    virtual int Gets(char* buf, int size) = 0; 
 
    virtual long Ctrl(int cmd, long larg, void* parg); 
    virtual void Flush() = 0; 
 
    int WriteOld(const char* data, int dlen); 
    int ReadOld(char* data, int dlen); 
 
    inline operator BIO* () noexcept { 
        return Bio; 
    } 
 
private: 
    BIO* Bio; 
}; 
 
} // namespace NOpenSSL