premiere-libtorrent/include/libtorrent/storage_defs.hpp

/*

Copyright (c) 2003-2015, Arvid Norberg
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the distribution.
    * Neither the name of the author nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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*/

#ifndef TORRENT_STORAGE_DEFS_HPP_INCLUDE
#define TORRENT_STORAGE_DEFS_HPP_INCLUDE

#include "libtorrent/config.hpp"
#include <boost/function.hpp>
#include <string>
#include <vector>

namespace libtorrent
{
	struct storage_interface;
	class file_storage;
	struct file_pool;
	class torrent_info;

	// types of storage allocation used for add_torrent_params::storage_mode.
	enum storage_mode_t
	{
		// All pieces will be written to their final position, all files will be
		// allocated in full when the torrent is first started. This is done with
		// ``fallocate()`` and similar calls. This mode minimizes fragmentation.
		storage_mode_allocate,

		// All pieces will be written to the place where they belong and sparse files
		// will be used. This is the recommended, and default mode.
		storage_mode_sparse,

		// internal
		internal_storage_mode_compact_deprecated
#ifndef TORRENT_NO_DEPRECATE
		, // comma here to avoid compiler warning
		storage_mode_compact = internal_storage_mode_compact_deprecated
#endif
	};

	// see default_storage::default_storage()
	struct TORRENT_EXPORT storage_params
	{
		storage_params(): files(NULL), mapped_files(NULL), pool(NULL)
			, mode(storage_mode_sparse), priorities(NULL), info(NULL) {}
		file_storage const* files;
		file_storage const* mapped_files; // optional
		std::string path;
		file_pool* pool;
		storage_mode_t mode;
		std::vector<boost::uint8_t> const* priorities; // optional
		torrent_info const* info; // optional
	};
	
	typedef boost::function<storage_interface*(storage_params const& params)> storage_constructor_type;

	// the constructor function for the regular file storage. This is the
	// default value for add_torrent_params::storage.
	TORRENT_EXPORT storage_interface* default_storage_constructor(storage_params const&);

	// the constructor function for the disabled storage. This can be used for
	// testing and benchmarking. It will throw away any data written to
	// it and return garbage for anything read from it.
	TORRENT_EXPORT storage_interface* disabled_storage_constructor(storage_params const&);

	TORRENT_EXPORT storage_interface* zero_storage_constructor(storage_params const&);
}

#endif