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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/searchlib/bitcompression/countcompression.h>
#include <limits>
namespace search::diskindex {
class ThreeLevelCountWriteBuffers
{
public:
using EC = search::bitcompression::PostingListCountFileEncodeContext;
EC &_sse;
EC &_spe;
EC &_pe;
ComprFileWriteContext _wcsse;
ComprFileWriteContext _wcspe;
ComprFileWriteContext _wcpe;
uint32_t _ssHeaderLen; // Length of header for sparse sparse file (bytes)
uint32_t _spHeaderLen; // Length of header for sparse page file (bytes)
uint32_t _pHeaderLen; // Length of header for page file (bytes)
uint64_t _ssFileBitSize;
uint64_t _spFileBitSize;
uint64_t _pFileBitSize;
ThreeLevelCountWriteBuffers(EC &sse, EC &spe, EC &pe);
~ThreeLevelCountWriteBuffers();
void flush();
// unit test method. Just pads without writing proper header
void startPad(uint32_t ssHeaderLen, uint32_t spHeaderLen, uint32_t pHeaderLen);
};
class ThreeLevelCountReadBuffers
{
public:
using EC = search::bitcompression::PostingListCountFileEncodeContext;
using DC = search::bitcompression::PostingListCountFileDecodeContext;
DC &_ssd;
DC &_spd;
DC &_pd;
ComprFileReadContext _rcssd;
ComprFileReadContext _rcspd;
ComprFileReadContext _rcpd;
uint32_t _ssHeaderLen;
uint32_t _spHeaderLen;
uint32_t _pHeaderLen;
uint64_t _ssFileBitSize;
uint64_t _spFileBitSize;
uint64_t _pFileBitSize;
// Unit test usage constructor.
ThreeLevelCountReadBuffers(DC &ssd, DC &spd, DC &pd, ThreeLevelCountWriteBuffers &wb);
// Normal usage constructor
ThreeLevelCountReadBuffers(DC &ssd, DC &spd, DC &pd);
~ThreeLevelCountReadBuffers();
};
}
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