ClickHouse/dbms/src/IO/ZlibInflatingReadBuffer.h

41 lines
872 B
C++

#pragma once
#include <IO/ReadBuffer.h>
#include <IO/BufferWithOwnMemory.h>
#include <IO/ZlibCompressionMethod.h>
#include <zlib.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ZLIB_INFLATE_FAILED;
}
/// 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(
ReadBuffer & in_,
ZlibCompressionMethod compression_method,
size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
char * existing_memory = nullptr,
size_t alignment = 0);
~ZlibInflatingReadBuffer() override;
private:
bool nextImpl() override;
ReadBuffer & in;
z_stream zstr;
bool eof;
};
}