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#pragma once
#include <IO/BufferWithOwnMemory.h>
#include <IO/WriteBuffer.h>
#include <IO/WriteBufferDecorator.h>
#include <lzma.h>
namespace DB
{
/// Performs compression using lzma library and writes compressed data to out_ WriteBuffer.
class LZMADeflatingWriteBuffer : public WriteBufferWithOwnMemoryDecorator
{
public:
LZMADeflatingWriteBuffer(
std::unique_ptr<WriteBuffer> out_,
int compression_level,
size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
char * existing_memory = nullptr,
size_t alignment = 0);
~LZMADeflatingWriteBuffer() override;
private:
void nextImpl() override;
void finalizeBefore() override;
void finalizeAfter() override;
lzma_stream lstr;
};
}
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