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Diffstat (limited to 'main/openvpn/src/openvpn/lzo.h')
| -rw-r--r-- | main/openvpn/src/openvpn/lzo.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/main/openvpn/src/openvpn/lzo.h b/main/openvpn/src/openvpn/lzo.h new file mode 100644 index 00000000..f33e587a --- /dev/null +++ b/main/openvpn/src/openvpn/lzo.h @@ -0,0 +1,131 @@ +/* + * OpenVPN -- An application to securely tunnel IP networks + * over a single UDP port, with support for SSL/TLS-based + * session authentication and key exchange, + * packet encryption, packet authentication, and + * packet compression. + * + * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net> + * + * 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 + */ + +#ifndef OPENVPN_LZO_H +#define OPENVPN_LZO_H + + +/** + * @file + * Data Channel Compression module header file. + */ + + +#if defined(ENABLE_LZO) + +/** + * @addtogroup compression + * @{ + */ + +#if defined(HAVE_LZO_LZOUTIL_H) +#include "lzo/lzoutil.h" +#elif defined(HAVE_LZOUTIL_H) +#include "lzoutil.h" +#endif +#if defined(HAVE_LZO_LZO1X_H) +#include "lzo/lzo1x.h" +#elif defined(HAVE_LZO1X_H) +#include "lzo1x.h" +#endif + +#include "buffer.h" +#include "mtu.h" +#include "common.h" +#include "status.h" + +extern const struct compress_alg lzo_alg; + +/**************************************************************************/ +/** @name LZO library interface defines *//** @{ *//***********************/ +#define LZO_COMPRESS lzo1x_1_15_compress + /**< LZO library compression function. + * + * Use \c lzo1x_1_15_compress because it + * is described as faster than the + * standard routine, although it does + * need a bit more memory. */ +#define LZO_WORKSPACE LZO1X_1_15_MEM_COMPRESS + /**< The size in bytes of the memory + * %buffer required by the LZO library + * compression algorithm. */ +#define LZO_DECOMPRESS lzo1x_decompress_safe + /**< LZO library decompression function. + * + * Use safe decompress because it + * includes checks for possible %buffer + * overflows. If speed is essential and + * you will always be using a MAC to + * verify the integrity of incoming + * packets, you might want to consider + * using the non-safe version. */ +/** @} name LZO library interface *//**************************************/ + + +/**************************************************************************/ +/** @name Adaptive compression defines *//** @{ *//************************/ +#define AC_SAMP_SEC 2 /**< Number of seconds in a sample period. */ +#define AC_MIN_BYTES 1000 /**< Minimum number of bytes a sample + * period must contain for it to be + * evaluated. */ +#define AC_SAVE_PCT 5 /**< Minimum size reduction percentage + * below which compression will be + * turned off. */ +#define AC_OFF_SEC 60 /**< Seconds to wait after compression has + * been turned off before retesting. */ +/** @} name Adaptive compression defines *//*******************************/ + +/** + * Adaptive compression state. + */ +struct lzo_adaptive_compress { + bool compress_state; + time_t next; + int n_total; + int n_comp; +}; + + +/** + * State for the compression and decompression routines. + * + * This structure contains compression module state, such as whether + * compression is enabled and the status of the adaptive compression + * routines. It also contains an allocated working buffer. + * + * One of these compression workspace structures is maintained for each + * VPN tunnel. + */ +struct lzo_compress_workspace +{ + lzo_voidp wmem; + int wmem_size; + struct lzo_adaptive_compress ac; +}; + +/** @} addtogroup compression */ + + +#endif /* ENABLE_LZO && USE_COMP */ +#endif |