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#pragma once
#include <IO/SeekableReadBuffer.h>
#include <vector>
namespace DB
{
/// Reads from the concatenation of multiple SeekableReadBuffer's
class ConcatSeekableReadBuffer : public SeekableReadBuffer, public WithFileSize
{
public:
ConcatSeekableReadBuffer() : SeekableReadBuffer(nullptr, 0) { }
ConcatSeekableReadBuffer(std::unique_ptr<SeekableReadBuffer> buf1, size_t size1, std::unique_ptr<SeekableReadBuffer> buf2, size_t size2);
ConcatSeekableReadBuffer(SeekableReadBuffer & buf1, size_t size1, SeekableReadBuffer & buf2, size_t size2);
void appendBuffer(std::unique_ptr<SeekableReadBuffer> buffer, size_t size);
void appendBuffer(SeekableReadBuffer & buffer, size_t size);
off_t seek(off_t off, int whence) override;
off_t getPosition() override;
size_t getFileSize() override { return total_size; }
private:
bool nextImpl() override;
void appendBuffer(SeekableReadBuffer * buffer, bool own, size_t size);
struct BufferInfo
{
BufferInfo() = default;
BufferInfo(BufferInfo && src) noexcept;
~BufferInfo();
SeekableReadBuffer * in = nullptr;
bool own_in = false;
size_t size = 0;
};
std::vector<BufferInfo> buffers;
size_t total_size = 0;
size_t current = 0;
size_t current_start_pos = 0; /// Position of the current buffer's begin.
};
}
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