ClickHouse/src/IO/ZlibInflatingReadBuffer.h
2020-04-03 18:14:31 +03:00

40 lines
852 B
C++

#pragma once
#include <IO/ReadBuffer.h>
#include <IO/BufferWithOwnMemory.h>
#include <IO/CompressionMethod.h>
#include <zlib.h>
namespace DB
{
namespace ErrorCodes
{
}
/// Reads compressed data from ReadBuffer in_ and performs decompression using zlib library.
/// This buffer is able to seamlessly decompress multiple concatenated zlib streams.
class ZlibInflatingReadBuffer : public BufferWithOwnMemory<ReadBuffer>
{
public:
ZlibInflatingReadBuffer(
std::unique_ptr<ReadBuffer> in_,
CompressionMethod compression_method,
size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
char * existing_memory = nullptr,
size_t alignment = 0);
~ZlibInflatingReadBuffer() override;
private:
bool nextImpl() override;
std::unique_ptr<ReadBuffer> in;
z_stream zstr;
bool eof;
};
}