io/CFileInputStream.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */
#pragma once
 
#include <mrpt/io/CStream.h>
#include <fstream>
 
namespace mrpt
{
namespace io
{
/** This CStream derived class allow using a file as a read-only, binary stream.
 *
 * \sa CStream, CFileStream, CFileGZInputStream
 * \ingroup mrpt_io_grp
 */
class CFileInputStream : public CStream
{
   private:
        /** The actual input file stream. */
        std::ifstream m_if;
 
   public:
        /** Constructor
         * \param fileName The file to be open in this stream
         * \exception std::exception On error trying to open the file.
         */
        CFileInputStream(const std::string& fileName);
        /** Default constructor */
        CFileInputStream();
 
        CFileInputStream(const CFileInputStream&) = delete;
        CFileInputStream& operator=(const CFileInputStream&) = delete;
 
        virtual ~CFileInputStream();
 
        /** Open a file for reading
         * \param fileName The file to be open in this stream
         * \return true on success.
         */
        bool open(const std::string& fileName);
        /** Close the stream */
        void close();
        /** Returns true if the file was open without errors. */
        bool fileOpenCorrectly() const;
        /** Returns true if the file was open without errors. */
        bool is_open() { return fileOpenCorrectly(); }
        /** Will be true if EOF has been already reached. */
        bool checkEOF();
        /** Resets stream error status bits (e.g. after an EOF) */
        void clearError();
 
        // See docs in base class
        uint64_t Seek(
                int64_t off, CStream::TSeekOrigin Origin = sFromBeginning) override;
        // See docs in base class
        uint64_t getTotalBytesCount() const override;
        // See docs in base class
        uint64_t getPosition() const override;
 
        /** Reads one string line from the file (until a new-line character)
          * \return true if a line has been read, false on EOF or error. */
        bool readLine(std::string& str);
 
        size_t Read(void* Buffer, size_t Count) override;
        size_t Write(const void* Buffer, size_t Count) override;
};  // End of class def.
}  // End of namespace
}  // end of namespace