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coding/file_reader.hpp
50 строк
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Maxim Pimenov
Review fixes.
21 июн 2018, 15:05
21 июн 2018, 15:05
b6fc1f7
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#pragma once #include "coding/reader.hpp" #include "base/base.hpp" #include <cstddef> #include <cstdint> #include <memory> #include <string> // FileReader, cheap to copy, not thread safe. // It is assumed that file is not modified during FireReader lifetime, // because of caching and assumption that Size() is constant. class FileReader : public ModelReader { public: static uint32_t const kDefaultLogPageSize; static uint32_t const kDefaultLogPageCount; explicit FileReader(std::string const & fileName); FileReader(std::string const & fileName, uint32_t logPageSize, uint32_t logPageCount); // Reader overrides: uint64_t Size() const override { return m_size; } void Read(uint64_t pos, void * p, size_t size) const override; std::unique_ptr<Reader> CreateSubReader(uint64_t pos, uint64_t size) const override; FileReader SubReader(uint64_t pos, uint64_t size) const; uint64_t GetOffset() const { return m_offset; } protected: // Used in special derived readers. void SetOffsetAndSize(uint64_t offset, uint64_t size); private: class FileReaderData; FileReader(FileReader const & reader, uint64_t offset, uint64_t size, uint32_t logPageSize, uint32_t logPageCount); // Throws an exception if a (pos, size) read would result in an out-of-bounds access. void CheckPosAndSize(uint64_t pos, uint64_t size) const; uint32_t m_logPageSize; uint32_t m_logPageCount; std::shared_ptr<FileReaderData> m_fileData; uint64_t m_offset; uint64_t m_size; };