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#pragma once
#ifndef MARISA_GRIMOIRE_IO_MAPPER_H_
#define MARISA_GRIMOIRE_IO_MAPPER_H_
#include <cstdio>
#include "../../base.h"
namespace marisa {
namespace grimoire {
namespace io {
class Mapper {
public:
Mapper();
~Mapper();
void open(const char *filename);
void open(const void *ptr, std::size_t size);
template <typename T>
void map(T *obj) {
MARISA_THROW_IF(obj == NULL, MARISA_NULL_ERROR);
*obj = *static_cast<const T *>(map_data(sizeof(T)));
}
template <typename T>
void map(const T **objs, std::size_t num_objs) {
MARISA_THROW_IF((objs == NULL) && (num_objs != 0), MARISA_NULL_ERROR);
MARISA_THROW_IF(num_objs > (MARISA_SIZE_MAX / sizeof(T)),
MARISA_SIZE_ERROR);
*objs = static_cast<const T *>(map_data(sizeof(T) * num_objs));
}
void seek(std::size_t size);
bool is_open() const;
void clear();
void swap(Mapper &rhs);
private:
const void *ptr_;
void *origin_;
std::size_t avail_;
std::size_t size_;
#if (defined _WIN32) || (defined _WIN64)
void *file_;
void *map_;
#else // (defined _WIN32) || (defined _WIN64)
int fd_;
#endif // (defined _WIN32) || (defined _WIN64)
void open_(const char *filename);
void open_(const void *ptr, std::size_t size);
const void *map_data(std::size_t size);
// Disallows copy and assignment.
Mapper(const Mapper &);
Mapper &operator=(const Mapper &);
};
} // namespace io
} // namespace grimoire
} // namespace marisa
#endif // MARISA_GRIMOIRE_IO_MAPPER_H_
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