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::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.
}