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#pragma once
#include "coding/reader.hpp"
#include "base/base.hpp"
#include "std/shared_ptr.hpp"
// 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
{
using BaseType = ModelReader;
public:
explicit FileReader(string const & fileName,
bool withExceptions = false,
uint32_t logPageSize = 10,
uint32_t logPageCount = 4);
class FileReaderData;
uint64_t Size() const override;
void Read(uint64_t pos, void * p, size_t size) const override;
FileReader SubReader(uint64_t pos, uint64_t size) const;
unique_ptr<Reader> CreateSubReader(uint64_t pos, uint64_t size) const override;
inline uint64_t GetOffset() const { return m_offset; }
protected:
void CheckPosAndSize(uint64_t pos, uint64_t size) const;
/// Make assertion that pos + size in FileReader bounds.
bool AssertPosAndSize(uint64_t pos, uint64_t size) const;
/// Used in special derived readers.
void SetOffsetAndSize(uint64_t offset, uint64_t size);
private:
FileReader(FileReader const & reader, uint64_t offset, uint64_t size);
shared_ptr<FileReaderData> m_fileData;
uint64_t m_offset;
uint64_t m_size;
bool m_withExceptions;
};
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