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44 lines
919 B
C++
44 lines
919 B
C++
#pragma once
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#include "coding/reader.hpp"
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#include <cstddef>
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#include <cstdint>
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#include <memory>
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#include <string>
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/// @TODO Add Windows support
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class MmapReader : public ModelReader
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{
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public:
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enum class Advice
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{
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Normal,
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Random,
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Sequential
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};
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explicit MmapReader(std::string const & fileName, Advice advice = Advice::Normal);
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uint64_t Size() const override;
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void Read(uint64_t pos, void * p, size_t size) const override;
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std::unique_ptr<Reader> CreateSubReader(uint64_t pos, uint64_t size) const override;
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/// Direct file/memory access
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uint8_t * Data() const;
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protected:
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// Used in special derived readers.
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void SetOffsetAndSize(uint64_t offset, uint64_t size);
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private:
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using base_type = ModelReader;
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class MmapData;
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MmapReader(MmapReader const & reader, uint64_t offset, uint64_t size);
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std::shared_ptr<MmapData> m_data;
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uint64_t m_offset;
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uint64_t m_size;
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};
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