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75 lines
1.6 KiB
75 lines
1.6 KiB
#ifndef _MAP_H
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#define _MAP_H
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#ifdef __cplusplus
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extern "C" {
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#define restrict __restrict__
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#endif
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#include <stddef.h>
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typedef struct mmap {
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int fd;
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void* ptr;
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size_t len;
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} mmap_t;
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int open_and_map(const char* file, mmap_t* restrict ptr);
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int unmap_and_close(mmap_t map);
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typedef void* (*map_cb)(mmap_t map, void* user);
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void* map_and_then(const char* file, map_cb callback, void* user);
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#ifdef __cplusplus
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}
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#include <panic.h>
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#include "reinterpret.h"
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#include <cstdint>
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namespace mm {
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struct mmap {
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inline static mmap_t create_raw(const char* file)
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{
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mmap_t map;
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if (!open_and_map(file, &map)) panic("Failed to map file");
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return map;
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}
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inline mmap(mmap_t raw) :inner(raw){}
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inline mmap(const char* file)
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: inner(create_raw(file)) {}
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inline mmap(mmap&& move) : inner(move.inner)
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{
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auto other = const_cast<mmap_t*>(&move.inner);
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other->ptr = nullptr;
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}
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inline mmap(const mmap& copt) = delete;
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inline ~mmap()
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{
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if (inner.ptr) {
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::unmap_and_close(inner);
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}
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}
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inline const span<const unsigned char> as_span() const { return span(as_ptr(), size()); }
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inline span<unsigned char> as_span() { return span(as_ptr(), size()); }
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inline const std::uint8_t* as_ptr() const { return (const std::uint8_t*)inner.ptr; }
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inline std::uint8_t* as_ptr() { return (std::uint8_t*)inner.ptr; }
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inline std::size_t size() const { return inner.len; }
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inline int as_fd() const { return inner.fd; }
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inline const mmap_t& as_raw() const { return inner; }
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private:
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const mmap_t inner;
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};
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}
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#undef restrict
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#endif
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#endif /* _MAP_H */
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