67 lines
1.3 KiB
C++
67 lines
1.3 KiB
C++
#ifndef MARISA_GRIMOIRE_IO_READER_H_
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#define MARISA_GRIMOIRE_IO_READER_H_
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#include <cstdio>
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#include <iostream>
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#include "marisa/base.h"
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namespace marisa {
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namespace grimoire {
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namespace io {
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class Reader {
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public:
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Reader();
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~Reader();
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void open(const char *filename);
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void open(std::FILE *file);
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void open(int fd);
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void open(std::istream &stream);
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template <typename T>
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void read(T *obj) {
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MARISA_THROW_IF(obj == NULL, MARISA_NULL_ERROR);
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read_data(obj, sizeof(T));
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}
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template <typename T>
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void read(T *objs, std::size_t num_objs) {
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MARISA_THROW_IF((objs == NULL) && (num_objs != 0), MARISA_NULL_ERROR);
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MARISA_THROW_IF(num_objs > (MARISA_SIZE_MAX / sizeof(T)),
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MARISA_SIZE_ERROR);
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read_data(objs, sizeof(T) * num_objs);
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}
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void seek(std::size_t size);
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bool is_open() const;
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void clear();
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void swap(Reader &rhs);
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private:
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std::FILE *file_;
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int fd_;
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std::istream *stream_;
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bool needs_fclose_;
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void open_(const char *filename);
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void open_(std::FILE *file);
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void open_(int fd);
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void open_(std::istream &stream);
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void read_data(void *buf, std::size_t size);
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// Disallows copy and assignment.
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Reader(const Reader &);
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Reader &operator=(const Reader &);
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};
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} // namespace io
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} // namespace grimoire
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} // namespace marisa
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#endif // MARISA_GRIMOIRE_IO_READER_H_
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