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-/*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-/** \file
- *
- * This is a library which manages reference counted buffers.
- */
-
-#ifndef MPD_PAGE_HXX
-#define MPD_PAGE_HXX
-
-#include "util/RefCount.hxx"
-
-#include <algorithm>
-
-#include <stddef.h>
-
-/**
- * A dynamically allocated buffer which keeps track of its reference
- * count. This is useful for passing buffers around, when several
- * instances hold references to one buffer.
- */
-class Page {
- /**
- * The number of references to this buffer. This library uses
- * atomic functions to access it, i.e. no locks are required.
- * As soon as this attribute reaches zero, the buffer is
- * freed.
- */
- RefCount ref;
-
-public:
- /**
- * The size of this buffer in bytes.
- */
- const size_t size;
-
- /**
- * Dynamic array containing the buffer data.
- */
- unsigned char data[sizeof(long)];
-
-protected:
- Page(size_t _size):size(_size) {}
- ~Page() = default;
-
- /**
- * Allocates a new #Page object, without filling the data
- * element.
- */
- static Page *Create(size_t size);
-
-public:
- /**
- * Creates a new #page object, and copies data from the
- * specified buffer. It is initialized with a reference count
- * of 1.
- *
- * @param data the source buffer
- * @param size the size of the source buffer
- */
- static Page *Copy(const void *data, size_t size);
-
- /**
- * Concatenates two pages to a new page.
- *
- * @param a the first page
- * @param b the second page, which is appended
- */
- static Page *Concat(const Page &a, const Page &b);
-
- /**
- * Increases the reference counter.
- */
- void Ref() {
- ref.Increment();
- }
-
- /**
- * Decreases the reference counter. If it reaches zero, the #page is
- * freed.
- *
- * @return true if the #page has been freed
- */
- bool Unref();
-};
-
-#endif