ClickHouse/dbms/include/DB/IO/ReadBufferFromFileBase.h

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#pragma once
#include <string>
#include <fcntl.h>
#include <DB/IO/ReadBuffer.h>
#include <DB/IO/BufferWithOwnMemory.h>
namespace DB
{
class ReadBufferFromFileBase : public BufferWithOwnMemory<ReadBuffer>
{
public:
ReadBufferFromFileBase(size_t buf_size, char * existing_memory, size_t alignment);
virtual ~ReadBufferFromFileBase();
off_t seek(off_t off, int whence = SEEK_SET);
virtual off_t getPositionInFile() = 0;
virtual std::string getFileName() const = 0;
virtual int getFD() const = 0;
protected:
virtual off_t doSeek(off_t off, int whence) = 0;
};
}