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#pragma once
#ifndef MARISA_GRIMOIRE_IO_READER_H_
#define MARISA_GRIMOIRE_IO_READER_H_
#include <cstdio>
#include <iostream>
#include "../../base.h"
namespace marisa {
namespace grimoire {
namespace io {
class Reader {
public:
Reader();
~Reader();
void open(const char *filename);
void open(std::FILE *file);
void open(int fd);
void open(std::istream &stream);
template <typename T>
void read(T *obj) {
MARISA_THROW_IF(obj == NULL, MARISA_NULL_ERROR);
read_data(obj, sizeof(T));
}
template <typename T>
void read(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);
read_data(objs, sizeof(T) * num_objs);
}
void seek(std::size_t size);
bool is_open() const;
void clear();
void swap(Reader &rhs);
private:
std::FILE *file_;
int fd_;
std::istream *stream_;
bool needs_fclose_;
void open_(const char *filename);
void open_(std::FILE *file);
void open_(int fd);
void open_(std::istream &stream);
void read_data(void *buf, std::size_t size);
// Disallows copy and assignment.
Reader(const Reader &);
Reader &operator=(const Reader &);
};
} // namespace io
} // namespace grimoire
} // namespace marisa
#endif // MARISA_GRIMOIRE_IO_READER_H_
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