data_stream.h

/*********************************************************************************************************************************************/
/*  DocWire SDK: Award-winning modern data processing in C++20. SourceForge Community Choice & Microsoft support. AI-driven processing.      */
/*  Supports nearly 100 data formats, including email boxes and OCR. Boost efficiency in text extraction, web data extraction, data mining,  */
/*  document analysis. Offline processing possible for security and confidentiality                                                          */
/*                                                                                                                                           */
/*  Copyright (c) SILVERCODERS Ltd, http://silvercoders.com                                                                                  */
/*  Project homepage: https://github.com/docwire/docwire                                                                                     */
/*                                                                                                                                           */
/*  SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-DocWire-Commercial                                                                  */
/*********************************************************************************************************************************************/
 
#ifndef DOCWIRE_DATA_STREAM_H
#define DOCWIRE_DATA_STREAM_H
 
#include "core_export.h"
#include <stdio.h>
#include <string>
#include "pimpl.h"
 
namespace docwire
{
 
class data_stream
{
    public:
        virtual ~data_stream(){}
        virtual bool open() = 0;
        virtual bool close() = 0;
        virtual bool read(void* data, int element_size, size_t elements_num) = 0;
        virtual bool seek(int offset, int whence) = 0;
        virtual bool eof() = 0;
        virtual int getc() = 0;
        virtual bool unGetc(int ch) = 0;
        virtual size_t size() = 0;
        virtual size_t tell() = 0;
        virtual std::string name() = 0;
        virtual data_stream* clone() = 0;
};
 
class DOCWIRE_CORE_EXPORT file_stream : public data_stream, public with_pimpl<file_stream>
{
    public:
        file_stream(const std::string& file_name);
        ~file_stream();
        bool open();
        bool close();
        bool read(void* data, int element_size, size_t elements_num);
        bool seek(int offset, int whence);
        bool eof();
        int getc();
        bool unGetc(int ch);
        size_t size();
        size_t tell();
        std::string name();
        data_stream* clone();
};
 
class DOCWIRE_CORE_EXPORT buffer_stream : public data_stream, public with_pimpl<buffer_stream>
{
    public:
        buffer_stream(const char* buffer, size_t size);
        bool open();
        bool close();
        bool read(void* data, int element_size, size_t elements_num);
        bool seek(int offset, int whence);
        bool eof();
        int getc();
        bool unGetc(int ch);
        size_t size();
        size_t tell();
        std::string name();
        data_stream* clone();
};
 
} // namespace docwire
 
#endif  //DOCWIRE_DATA_STREAM_H