62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
#ifndef MARISA_MAPPER_H_
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#define MARISA_MAPPER_H_
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#include <cstdio>
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#include "base.h"
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namespace marisa {
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class Mapper {
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public:
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Mapper();
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Mapper(const void *ptr, std::size_t size);
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~Mapper();
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void open(const char *filename, long offset = 0, int whence = SEEK_SET);
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template <typename T>
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void map(T *obj) {
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MARISA_THROW_IF(obj == NULL, MARISA_PARAM_ERROR);
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*obj = *static_cast<const T *>(map_data(sizeof(T)));
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}
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template <typename T>
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void map(const T **objs, std::size_t num_objs) {
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MARISA_THROW_IF((objs == NULL) && (num_objs != 0), MARISA_PARAM_ERROR);
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MARISA_THROW_IF(num_objs > (MARISA_UINT32_MAX / sizeof(T)),
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MARISA_SIZE_ERROR);
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*objs = static_cast<const T *>(map_data(sizeof(T) * num_objs));
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}
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bool is_open() const {
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return ptr_ != NULL;
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}
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void clear();
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void swap(Mapper *rhs);
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private:
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const void *ptr_;
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void *origin_;
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std::size_t avail_;
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std::size_t size_;
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#if defined _WIN32 || defined _WIN64
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void *file_;
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void *map_;
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#else // defined _WIN32 || defined _WIN64
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int fd_;
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#endif // defined _WIN32 || defined _WIN64
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void seek(long offset, int whence);
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const void *map_data(std::size_t size);
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// Disallows copy and assignment.
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Mapper(const Mapper &);
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Mapper &operator=(const Mapper &);
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};
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} // namespace marisa
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#endif // MARISA_MAPPER_H_
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