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#pragma once
#include <IO/WriteBuffer.h>
#include <IO/BufferWithOwnMemory.h>
#include <IO/CompressionMethod.h>
#include <IO/WriteBufferDecorator.h>
#include <zlib.h>
namespace DB
{
/// Performs compression using zlib library and writes compressed data to out_ WriteBuffer.
class ZlibDeflatingWriteBuffer : public WriteBufferWithOwnMemoryDecorator
{
public:
ZlibDeflatingWriteBuffer(
std::unique_ptr<WriteBuffer> out_,
CompressionMethod compression_method,
int compression_level,
size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
char * existing_memory = nullptr,
size_t alignment = 0);
~ZlibDeflatingWriteBuffer() override;
private:
void nextImpl() override;
/// Flush all pending data and write zlib footer to the underlying buffer.
/// After the first call to this function, subsequent calls will have no effect and
/// an attempt to write to this buffer will result in exception.
virtual void finalizeBefore() override;
virtual void finalizeAfter() override;
z_stream zstr;
};
}
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