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600bb5f29a
* introduce ZlibDeflatingWriteBuffer and ZlibInflatingReadBuffer * use them instead of Poco streams * seamlessly uncompress multiple concatenated gzip streams
41 lines
815 B
C++
41 lines
815 B
C++
#pragma once
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/BufferWithOwnMemory.h>
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#include <DB/IO/ZlibCompressionMethod.h>
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#include <zlib.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int ZLIB_INFLATE_FAILED;
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}
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/// Reads compressed data from ReadBuffer in_ and performs decompression using zlib library.
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/// This buffer is able to seamlessly decompress multiple concatenated zlib streams.
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class ZlibInflatingReadBuffer : public BufferWithOwnMemory<ReadBuffer>
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{
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public:
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ZlibInflatingReadBuffer(
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ReadBuffer & in_,
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ZlibCompressionMethod compression_method,
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size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
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char * existing_memory = nullptr,
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size_t alignment = 0);
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~ZlibInflatingReadBuffer() override;
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private:
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bool nextImpl() override;
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ReadBuffer & in;
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z_stream zstr;
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bool eof;
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};
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}
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