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FileDescriptorDevice.h

/*****************************************************************************
 * Author:   Valient Gough <vgough@pobox.com>
 *
 *****************************************************************************
 * Copyright (c) 2001, Valient Gough
 *
 * This library is free software; you can distribute it and/or modify it under
 * the terms of the GNU Lesser General Public License (LGPL), as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the LGPL in the file COPYING for more
 * details.
 *
 */

#ifndef _FileDescriptorDevice_incl_
#define _FileDescriptorDevice_incl_

#include <rel/IODevice.h>
#include <rel/SmartPtr.h>

#include <stdio.h> // for FILE

namespace rel
{

    class FileDescriptorDevice : public IODevice
    {
    public:
        // The file descriptors are kept as smart pointers so that the caller
        // can decide wether they should be destroyed or not when this class is
        // destroyed.
        FileDescriptorDevice(const SmartPtr<int> &inputFD, 
                const SmartPtr<int> &outputFD);
        virtual ~FileDescriptorDevice();

        // for use in case both input and output are not known at construction
        // time.  This allows setting the input or output descriptor later.
        // Should be used only when descriptor was given as null in
        // constructor.
        virtual bool setInputDescriptor(const SmartPtr<int> &inputFD);
        virtual bool setOutputDescriptor(const SmartPtr<int> &outputFD);


        virtual int getReadDescriptor() const;

        virtual bool isDirectAccess() const;
        virtual size_type at() const;
        virtual bool at(size_type offset);

        virtual bool atEnd() const;

        virtual size_type writeBytes(const char *data, size_type len);
        virtual void flush();

        virtual size_type readBytes(char *data, size_type maxLen) const;

        //virtual std::string print();

    private:
        FileDescriptorDevice(const FileDescriptorDevice &);
        FileDescriptorDevice &operator=(const FileDescriptorDevice &);

        FILE *in;
        FILE *out;

        SmartPtr<int> inputFD;
        SmartPtr<int> outputFD;

        unsigned long inputSize;
    };

    void fileCloseDestructor(int descriptor);
    void fileCloseDestructor(int *descriptor);

} // namespace rel

#endif

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