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Diffstat (limited to 'lzo.h')
| -rw-r--r-- | lzo.h | 136 |
1 files changed, 0 insertions, 136 deletions
@@ -1,136 +0,0 @@ -/* - * 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 - -#ifdef USE_LZO - -#ifdef LZO_HEADER_DIR -#include "lzo/lzoutil.h" -#include "lzo/lzo1x.h" -#else -#include "lzoutil.h" -#include "lzo1x.h" -#endif - -#include "buffer.h" -#include "mtu.h" -#include "common.h" -#include "status.h" - -/* LZO flags */ -#define LZO_SELECTED (1<<0) -#define LZO_ON (1<<1) -#define LZO_ADAPTIVE (1<<2) - -/* - * Use LZO compress routine lzo1x_1_15_compress which is described - * as faster but needs a bit more memory than the standard routine. - * Use safe decompress (i.e. check for buffer overflows). - * You may want to use the non-safe version - * of decompress if speed is essential and if you know - * that you will always be using a MAC to verify the - * integrity of incoming packets. - */ -#define LZO_COMPRESS lzo1x_1_15_compress -#define LZO_WORKSPACE LZO1X_1_15_MEM_COMPRESS -#define LZO_DECOMPRESS lzo1x_decompress_safe - -#define LZO_EXTRA_BUFFER(len) ((len)/8 + 128 + 3) /* LZO 2.0 worst case size expansion. */ - -/* - * Don't try to compress any packet smaller than this. - */ -#define COMPRESS_THRESHOLD 100 - -/* - * Length of prepended prefix on LZO packets - */ -#define LZO_PREFIX_LEN 1 - -/* - * Adaptive compress parameters - */ -#define AC_SAMP_SEC 2 /* number of seconds in sample period */ -#define AC_MIN_BYTES 1000 /* sample period must have at least n bytes - to be valid for testing */ -#define AC_SAVE_PCT 5 /* turn off compress if we didn't save at - least this % during sample period */ -#define AC_OFF_SEC 60 /* if we turn off compression, don't do sample - retest for n seconds */ - -struct lzo_adaptive_compress { - bool compress_state; - time_t next; - int n_total; - int n_comp; -}; - -/* - * Compress and Uncompress routines. - */ - -struct lzo_compress_workspace -{ - lzo_voidp wmem; - int wmem_size; - struct lzo_adaptive_compress ac; - unsigned int flags; - bool defined; - - /* statistics */ - counter_type pre_decompress; - counter_type post_decompress; - counter_type pre_compress; - counter_type post_compress; -}; - -void lzo_adjust_frame_parameters(struct frame *frame); - -void lzo_compress_init (struct lzo_compress_workspace *lzowork, unsigned int flags); - -void lzo_compress_uninit (struct lzo_compress_workspace *lzowork); - -void lzo_modify_flags (struct lzo_compress_workspace *lzowork, unsigned int flags); - -void lzo_compress (struct buffer *buf, struct buffer work, - struct lzo_compress_workspace *lzowork, - const struct frame* frame); - -void lzo_decompress (struct buffer *buf, struct buffer work, - struct lzo_compress_workspace *lzowork, - const struct frame* frame); - -void lzo_print_stats (const struct lzo_compress_workspace *lzo_compwork, struct status_output *so); - -static inline bool -lzo_defined (const struct lzo_compress_workspace *lzowork) -{ - return lzowork->defined; -} - - -#endif /* USE_LZO */ -#endif |