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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
{
typedef ModelReader base_type;
public:
explicit FileReader(string const & fileName,
uint32_t logPageSize = 10,
uint32_t logPageCount = 4);
class FileReaderData;
uint64_t Size() const;
void Read(uint64_t pos, void * p, size_t size) const;
FileReader SubReader(uint64_t pos, uint64_t size) const;
FileReader * CreateSubReader(uint64_t pos, uint64_t size) const;
protected:
/// 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_pFileData;
uint64_t m_Offset;
uint64_t m_Size;
};
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