context_manager.h

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/*
 * Copyright (C) 2025 Mark Roszko <[email protected]>
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 * Copyright (C) 2007 Ecma International (original Java source)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * License info found here:
 * https://www.loc.gov/preservation/digital/formats/fdd/fdd000491.shtml
 */
 
#pragma once
 
#include <cstdint>
#include <vector>
#include <exporters/u3d/constants.h>
 
namespace U3D
{
class CONTEXT_MANAGER
{
public:
    CONTEXT_MANAGER();

    void AddSymbol( uint32_t aContext, uint32_t aSymbol );

    uint32_t GetSymbolFrequency( uint32_t aContext, uint32_t aSymbol );

    uint32_t GetCumulativeSymbolFrequency( uint32_t aContext, uint32_t aSymbol );

    uint32_t GetTotalSymbolFrequency( uint32_t aContext );

    uint32_t GetSymbolFromFrequency( uint32_t aContext, uint32_t symbolFrequency );
 
private:
    std::vector<std::vector<std::uint32_t>> m_symbolCount;
    std::vector<std::vector<std::uint32_t>> m_cumulativeCount;

    const uint32_t m_elephant;
    const uint32_t m_maximumSymbolInHistogram;
    const uint32_t m_arraySizeIncr;
};
 
} // namespace U3D