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* OpenVPN -- An application to securely tunnel IP networks
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* over a single UDP port, with support for SSL/TLS-based
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* session authentication and key exchange,
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* packet encryption, packet authentication, and
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* Copyright (C) 2002-2004 James Yonan <jim@yonan.net>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* Use LZO compress routine lzo1x_1_15_compress which is described
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* as faster but needs a bit more memory than the standard routine.
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* Use safe decompress (i.e. check for buffer overflows).
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* You may want to use the non-safe version
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* of decompress if speed is essential and if you know
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* that you will always be using a MAC to verify the
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* integrity of incoming packets.
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#define LZO_COMPRESS lzo1x_1_15_compress
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#define LZO_WORKSPACE LZO1X_1_15_MEM_COMPRESS
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#define LZO_DECOMPRESS lzo1x_decompress_safe
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#define LZO_EXTRA_BUFFER(len) ((len)/64 + 16 + 3) /* LZO worst case size expansion. */
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* Don't try to compress any packet smaller than this.
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#define COMPRESS_THRESHOLD 100
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* Adaptive compress parameters
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#define AC_SAMP_SEC 2 /* number of seconds in sample period */
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#define AC_MIN_BYTES 1000 /* sample period must have at least n bytes
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to be valid for testing */
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#define AC_SAVE_PCT 5 /* turn off compress if we didn't save at
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least this % during sample period */
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#define AC_OFF_SEC 60 /* if we turn off compression, don't do sample
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retest for n seconds */
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struct lzo_adaptive_compress {
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* Compress and Uncompress routines.
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struct lzo_compress_workspace
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struct lzo_adaptive_compress ac;
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counter_type pre_decompress;
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counter_type post_decompress;
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counter_type pre_compress;
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counter_type post_compress;
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void lzo_adjust_frame_parameters(struct frame *frame);
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void lzo_compress_init (struct lzo_compress_workspace *lzowork, bool adaptive);
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void lzo_compress_uninit (struct lzo_compress_workspace *lzowork);
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void lzo_compress (struct buffer *buf, struct buffer work,
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struct lzo_compress_workspace *lzowork,
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const struct frame* frame,
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const time_t current);
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void lzo_decompress (struct buffer *buf, struct buffer work,
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struct lzo_compress_workspace *lzowork,
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const struct frame* frame);
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void lzo_print_stats (struct lzo_compress_workspace *lzo_compwork);
added
removed
lzo.h
