Stream.Limited.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "Stream.hpp"
 
namespace CeresEngine {
 
    class LimitedInputStream final : public IDataStream {
    private:
        InputStream mStream;
        std::size_t mLimit = 0;
        std::size_t mPosition = 0;
 
    public:
        LimitedInputStream(InputStream stream, const std::size_t limit) : mStream(std::move(stream)), mLimit(limit) {}
 
    public: // Seeking & Telling
        [[nodiscard]] bool isSeekable(Seek mode = Seek::Start) const noexcept override { return false; }
 
        void seek(std::streamsize position, Seek mode = Seek::Start) override {}
 
        [[nodiscard]] bool isTellable() const noexcept override { return false; }
 
        [[nodiscard]] size_t tell() override { return mPosition; }
 
        [[nodiscard]] bool isSizeKnown() const noexcept override { return mStream->isSizeKnown(); }
 
        [[nodiscard]] size_t size() override { return std::min(mLimit, mStream->size()); }
 
    public: // Reading
        [[nodiscard]] bool isReadable() const noexcept override { return mStream->isReadable(); }
 
        [[nodiscard]] size_t read(void* data, size_t n) override;
    };
 
} // namespace CeresEngine