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#ifndef MARISA_ALPHA_READER_H_
#define MARISA_ALPHA_READER_H_
#include <cstdio>
#include <iostream>
#include "base.h"
namespace marisa_alpha {
class Reader {
public:
Reader();
explicit Reader(std::FILE *file);
explicit Reader(int fd);
explicit Reader(std::istream *stream);
~Reader();
void open(const char *filename, long offset = 0, int whence = SEEK_SET);
template <typename T>
void read(T *obj) {
MARISA_ALPHA_THROW_IF(obj == NULL, MARISA_ALPHA_PARAM_ERROR);
read_data(obj, sizeof(T));
}
template <typename T>
void read(T *objs, std::size_t num_objs) {
MARISA_ALPHA_THROW_IF((objs == NULL) && (num_objs != 0),
MARISA_ALPHA_PARAM_ERROR);
MARISA_ALPHA_THROW_IF(num_objs > (MARISA_ALPHA_UINT32_MAX / sizeof(T)),
MARISA_ALPHA_SIZE_ERROR);
if (num_objs != 0) {
read_data(objs, sizeof(T) * num_objs);
}
}
bool is_open() const {
return (file_ != NULL) || (fd_ != -1) || (stream_ != NULL);
}
void clear();
void swap(Reader *rhs);
private:
std::FILE *file_;
int fd_;
std::istream *stream_;
bool needs_fclose_;
void read_data(void *buf, std::size_t size);
// Disallows copy and assignment.
Reader(const Reader &);
Reader &operator=(const Reader &);
};
} // namespace marisa_alpha
#endif // MARISA_ALPHA_READER_H_
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