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-/*
- * OpenVPN -- An application to securely tunnel IP networks
- * over a single TCP/UDP port, with support for SSL/TLS-based
- * session authentication and key exchange,
- * packet encryption, packet authentication, and
- * packet compression.
- *
- * Copyright (C) 2010 Fox Crypto B.V. <openvpn@fox-it.com>
- *
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
- *
- * 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 (see the file COPYING included with this
- * distribution); if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-/**
- * @file Data Channel Compression module documentation file.
- */
-
-/**
- * @defgroup compression Data Channel Compression module
- *
- * This module offers compression of data channel packets.
- *
- * @par State structures
- * The Data Channel Compression module stores its internal state in a \c
- * lzo_compress_workspace structure. This state includes flags which
- * control the module's behavior and preallocated working memory. One
- * such structure is present for each VPN tunnel, and is stored in the \c
- * context.c2.lzo_compwork of the \c context associated with that VPN
- * tunnel.
- *
- * @par Initialization and cleanup
- * Every time a new \c lzo_compress_workspace is needed, it must be
- * initialized using the \c lzo_compress_init() function. Similarly,
- * every time a \c lzo_compress_workspace is no longer needed, it must be
- * cleaned up using the \c lzo_compress_uninit() function. These
- * functions take care of the allocation and freeing of internal working
- * memory, but not of the \c lzo_compress_workspace structures themselves.
- *
- * @par
- * Because of the one-to-one relationship between \c
- * lzo_compress_workspace structures and VPN tunnels, the above-mentioned
- * initialization and cleanup functions are called directly from the \c
- * init_instance() and \c close_instance() functions, which control the
- * initialization and cleanup of VPN tunnel instances and their associated
- * \c context structures.
- *
- * @par Packet processing functions
- * This module receives data channel packets from the \link data_control
- * Data Channel Control module\endlink and processes them according to the
- * settings of the packet's VPN tunnel. The \link data_control Data
- * Channel Control module\endlink uses the following interface functions:
- * - For packets which will be sent to a remote OpenVPN peer: \c
- * lzo_compress()
- * - For packets which have been received from a remote OpenVPN peer: \c
- * lzo_decompress()
- *
- * @par Settings that control this module's activity
- * Whether or not the Data Channel Compression module is active depends on
- * the compile-time \c ENABLE_LZO preprocessor macro and the runtime flags
- * stored in \c lzo_compress_workspace.flags of the associated VPN tunnel.
- * The latter are initialized from \c options.lzo, which gets its value
- * from the process's configuration sources, such as its configuration
- * file or command line %options.
- *
- * @par Adaptive compression
- * The compression module supports adaptive compression. If this feature
- * is enabled, the compression routines monitor their own performance and
- * turn compression on or off depending on whether it is leading to
- * significantly reduced payload size.
- *
- * @par Compression algorithms
- * This module uses the Lempel-Ziv-Oberhumer (LZO) compression algorithms.
- * These offer lossless compression and are designed for high-performance
- * decompression. This module uses the external \c lzo library's
- * implementation of the algorithms.
- *
- * @par
- * For more information on the LZO library, see:\n
- * http://www.oberhumer.com/opensource/lzo/
- */