/*
 * Transport.h
 * Copyright 1999-2000 Y.Takagi. All Rights Reserved.
 */

#ifndef __TRANSPORT_H
#define __TRANSPORT_H

#include <image.h>
#include <string>

class BDataIO;
class PrinterData;


using namespace std;


extern "C" {
        typedef BDataIO *(*PFN_init_transport)(BMessage *);
        typedef void (*PFN_exit_transport)(void);
}


class TransportException {
public:
                                        TransportException(const string &what_arg);
        const char*             What() const;

private:
        string fWhat;
};


class Transport {
public:
                                        Transport(const PrinterData* printerData);
                                        ~Transport();

        void                    Write(const void *buffer, size_t size)
                                                /* throw (TransportException) */;
        void                    Read(void *buffer, size_t size)
                                                /* throw (TransportException) */;
        bool                    CheckAbort() const;
        bool                    IsPrintToFileCanceled() const;
        const string&   LastError() const;

protected:
                                        Transport(const Transport& transport);
                                        Transport &operator=(const Transport& transport);

        void                    SetLastError(const char* message);

private:
        image_id                        fImage;
        PFN_init_transport      fInitTransport;
        PFN_exit_transport      fExitTransport;
        BDataIO*                        fDataStream;
        bool                            fAbort;
        string                          fLastErrorString;
};

#endif  // __TRANSPORT_H