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69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
#ifndef DBMS_COMMON_COMPRESSED_READBUFFER_H
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#define DBMS_COMMON_COMPRESSED_READBUFFER_H
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#include <vector>
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#include <city.h>
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#include <quicklz/quicklz_level1.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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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/CompressedStream.h>
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namespace DB
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{
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class CompressedReadBuffer : public BufferWithOwnMemory<ReadBuffer>
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{
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private:
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ReadBuffer & in;
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std::vector<char> compressed_buffer;
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char scratch[QLZ_SCRATCH_DECOMPRESS];
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bool nextImpl()
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{
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if (in.eof())
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return false;
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uint128 checksum;
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in.readStrict(reinterpret_cast<char *>(&checksum), sizeof(checksum));
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in.readStrict(&compressed_buffer[0], QUICKLZ_HEADER_SIZE);
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size_t size_compressed = qlz_size_compressed(&compressed_buffer[0]);
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if (size_compressed > DBMS_MAX_COMPRESSED_SIZE)
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throw Exception("Too large size_compressed. Most likely corrupted data.", ErrorCodes::TOO_LARGE_SIZE_COMPRESSED);
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size_t size_decompressed = qlz_size_decompressed(&compressed_buffer[0]);
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compressed_buffer.resize(size_compressed);
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memory.resize(size_decompressed);
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internal_buffer.resize(size_decompressed);
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working_buffer.resize(size_decompressed);
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in.readStrict(&compressed_buffer[QUICKLZ_HEADER_SIZE], size_compressed - QUICKLZ_HEADER_SIZE);
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if (checksum != CityHash128(&compressed_buffer[0], size_compressed))
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throw Exception("Checksum doesnt match: corrupted data.", ErrorCodes::CHECKSUM_DOESNT_MATCH);
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qlz_decompress(&compressed_buffer[0], working_buffer.begin(), scratch);
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return true;
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}
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public:
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CompressedReadBuffer(ReadBuffer & in_)
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: in(in_),
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compressed_buffer(QUICKLZ_HEADER_SIZE)
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{
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}
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};
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}
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#endif
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