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#pragma once
#include <memory>
#include <streambuf>
namespace DB
{
class ReadBuffer;
class SeekableReadBuffer;
/// `std::streambuf`-compatible wrapper around a ReadBuffer.
class StdStreamBufFromReadBuffer : public std::streambuf
{
public:
using Base = std::streambuf;
explicit StdStreamBufFromReadBuffer(std::unique_ptr<ReadBuffer> read_buffer_, size_t size_);
explicit StdStreamBufFromReadBuffer(ReadBuffer & read_buffer_, size_t size_);
~StdStreamBufFromReadBuffer() override;
private:
int underflow() override;
std::streamsize showmanyc() override;
std::streamsize xsgetn(char* s, std::streamsize count) override;
std::streampos seekoff(std::streamoff off, std::ios_base::seekdir dir, std::ios_base::openmode which) override;
std::streampos seekpos(std::streampos pos, std::ios_base::openmode which) override;
std::streamsize xsputn(const char* s, std::streamsize n) override;
int overflow(int c) override;
std::streampos getCurrentPosition() const;
std::unique_ptr<ReadBuffer> read_buffer;
SeekableReadBuffer * seekable_read_buffer = nullptr;
size_t size;
};
}
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