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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef Mappable_h
+#define Mappable_h
+
+#include <optional>
+#include "mozilla/RefCounted.h"
+#include "Utils.h"
+
+/**
+ * Helper class to mmap plain files.
+ */
+class Mappable : public mozilla::RefCounted<Mappable> {
+ public:
+ MOZ_DECLARE_REFCOUNTED_TYPENAME(Mappable)
+ ~Mappable() {}
+
+ MemoryRange mmap(const void* addr, size_t length, int prot, int flags,
+ off_t offset);
+
+ private:
+ void munmap(void* addr, size_t length) { ::munmap(addr, length); }
+ /* Limit use of Mappable::munmap to classes that keep track of the address
+ * and size of the mapping. This allows to ignore ::munmap return value. */
+ friend class Mappable1stPagePtr;
+ friend class LibHandle;
+
+ public:
+ /**
+ * Indicate to a Mappable instance that no further mmap is going to happen.
+ */
+ void finalize();
+
+ /**
+ * Returns the maximum length that can be mapped from this Mappable for
+ * offset = 0.
+ */
+ size_t GetLength() const;
+
+ /**
+ * Create a Mappable instance for the given file path.
+ */
+ static Mappable* Create(const char* path);
+
+ protected:
+ explicit Mappable(int fd) : fd(fd) {}
+
+ private:
+ /* File descriptor */
+ std::optional<AutoCloseFD> fd;
+};
+
+#endif /* Mappable_h */