1 files changed, 67 insertions, 0 deletions
diff --git a/lib/marisa/grimoire/io/mapper.h b/lib/marisa/grimoire/io/mapper.h
new file mode 100644
index 0000000..f701c94
--- /dev/null
+++ b/lib/marisa/grimoire/io/mapper.h
@@ -0,0 +1,67 @@
+#ifndef MARISA_GRIMOIRE_IO_MAPPER_H_
+#define MARISA_GRIMOIRE_IO_MAPPER_H_
+
+#include <cstdio>
+
+#include "marisa/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_