mirror of https://github.com/libAthena/athena.git
31 lines
946 B
C++
31 lines
946 B
C++
#pragma once
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#include <map>
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#include <deque>
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#include <vector>
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#include <cstdint>
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#include <athena/Types.hpp>
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struct LZLengthOffset {
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atUint32 length; // The number of bytes compressed
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atUint16 offset; // How far back in sliding window where bytes that match the lookAheadBuffer is located
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bool compare_equal(const LZLengthOffset& lo_pair) { return length == lo_pair.length && offset == lo_pair.offset; }
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};
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class LZLookupTable {
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public:
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LZLookupTable();
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LZLookupTable(atInt32 minimumMatch, atInt32 slidingWindow = 4096, atInt32 lookAheadWindow = 18);
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~LZLookupTable();
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LZLengthOffset search(atUint8* curPos, const atUint8* dataBegin, const atUint8* dataEnd);
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void setLookAheadWindow(atInt32 lookAheadWindow);
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private:
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typedef std::multimap<std::vector<uint8_t>, int32_t> LookupTable;
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LookupTable table;
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atInt32 m_minimumMatch;
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atInt32 m_slidingWindow;
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atInt32 m_lookAheadWindow;
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std::vector<uint8_t> m_buffer;
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};
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