ISeekableInputStream.h

#pragma once
 
#include "IInputStream.h"
 
 
enum class ASeekDir {
   BEGIN,

   CURRENT,

   END
};

class ISeekableInputStream: public IInputStream {
public:
   ~ISeekableInputStream() override = default;
   virtual void seek(std::streamoff offset, ASeekDir seekDir) = 0;

   [[nodiscard]] virtual std::streampos tell() noexcept = 0;

   virtual bool isEof() = 0;

   size_t fileSize() {
       auto current = tell();
       seek(0, ASeekDir::END);
       auto size = tell();
       seek(current, ASeekDir::BEGIN);
       return size;
   }
};

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