mlImageFormatFileAccess.h

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/*************************************************************************************
**
** Copyright 2016, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
#ifndef ML_IMAGE_FORMAT_FILE_ACCESS_H
#define ML_IMAGE_FORMAT_FILE_ACCESS_H
 
// Resolve platform dependencies.
#include "MLImageFormatBaseSystem.h"
 
#include <mlTypeDefs.h>
 
ML_START_NAMESPACE

  class MLIMAGEFORMATBASE_EXPORT MLImageFormatAbstractFileHandle
  {
  public:
    MLImageFormatAbstractFileHandle() {};

    virtual ~MLImageFormatAbstractFileHandle() {};

    MLuint8* read(MLuint startPosition, MLuint numBytes);

    virtual bool read(MLuint8* data, MLuint startPosition, MLuint numBytes) = 0;

    virtual MLErrorCode write(MLuint startPos, const MLuint8 *data, size_t length) = 0;

    virtual MLint64 getFileSize() = 0;

    virtual MLErrorCode close() = 0;
  };

  class MLIMAGEFORMATBASE_EXPORT MLImageFormatDiskFileHandle : public MLImageFormatAbstractFileHandle
  {
  public:
    MLImageFormatDiskFileHandle(int fd);

    ~MLImageFormatDiskFileHandle() override;

    bool read(MLuint8* data, MLuint startPosition, MLuint numBytes) override;

    MLErrorCode write(MLuint startPos, const MLuint8 *data, size_t length) override;

    MLint64 getFileSize() override;

    MLErrorCode close() override;
 
  private:
    int _fd;
  };
 
 
ML_END_NAMESPACE
 
#endif