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-rw-r--r--lzo.c275
1 files changed, 0 insertions, 275 deletions
diff --git a/lzo.c b/lzo.c
deleted file mode 100644
index 6ea0d03..0000000
--- a/lzo.c
+++ /dev/null
@@ -1,275 +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
- */
-
-#include "syshead.h"
-
-#ifdef USE_LZO
-
-#include "lzo.h"
-#include "error.h"
-#include "otime.h"
-
-#include "memdbg.h"
-
-static bool
-lzo_adaptive_compress_test (struct lzo_adaptive_compress *ac)
-{
- const bool save = ac->compress_state;
- const time_t local_now = now;
-
- if (!ac->compress_state)
- {
- if (local_now >= ac->next)
- {
- if (ac->n_total > AC_MIN_BYTES
- && (ac->n_total - ac->n_comp) < (ac->n_total / (100 / AC_SAVE_PCT)))
- {
- ac->compress_state = true;
- ac->next = local_now + AC_OFF_SEC;
- }
- else
- {
- ac->next = local_now + AC_SAMP_SEC;
- }
- dmsg (D_COMP, "lzo_adaptive_compress_test: comp=%d total=%d", ac->n_comp, ac->n_total);
- ac->n_total = ac->n_comp = 0;
- }
- }
- else
- {
- if (local_now >= ac->next)
- {
- ac->next = local_now + AC_SAMP_SEC;
- ac->n_total = ac->n_comp = 0;
- ac->compress_state = false;
- }
- }
-
- if (ac->compress_state != save)
- dmsg (D_COMP_LOW, "Adaptive compression state %s", (ac->compress_state ? "OFF" : "ON"));
-
- return !ac->compress_state;
-}
-
-static inline void
-lzo_adaptive_compress_data (struct lzo_adaptive_compress *ac, int n_total, int n_comp)
-{
- ac->n_total += n_total;
- ac->n_comp += n_comp;
-}
-
-void lzo_adjust_frame_parameters (struct frame *frame)
-{
- /* Leave room for our one-byte compressed/didn't-compress prefix byte. */
- frame_add_to_extra_frame (frame, LZO_PREFIX_LEN);
-
- /* Leave room for compression buffer to expand in worst case scenario
- where data is totally uncompressible */
- frame_add_to_extra_buffer (frame, LZO_EXTRA_BUFFER (EXPANDED_SIZE(frame)));
-}
-
-void
-lzo_compress_init (struct lzo_compress_workspace *lzowork, unsigned int flags)
-{
- CLEAR (*lzowork);
-
- lzowork->wmem_size = LZO_WORKSPACE;
- lzowork->flags = flags;
-
- if (lzo_init () != LZO_E_OK)
- msg (M_FATAL, "Cannot initialize LZO compression library");
- lzowork->wmem = (lzo_voidp) lzo_malloc (lzowork->wmem_size);
- check_malloc_return (lzowork->wmem);
- msg (M_INFO, "LZO compression initialized");
- lzowork->defined = true;
-}
-
-void
-lzo_compress_uninit (struct lzo_compress_workspace *lzowork)
-{
- if (lzowork)
- {
- ASSERT (lzowork->defined);
- lzo_free (lzowork->wmem);
- lzowork->wmem = NULL;
- lzowork->defined = false;
- }
-}
-
-static inline bool
-lzo_compression_enabled (struct lzo_compress_workspace *lzowork)
-{
- if ((lzowork->flags & (LZO_SELECTED|LZO_ON)) == (LZO_SELECTED|LZO_ON))
- {
- if (lzowork->flags & LZO_ADAPTIVE)
- return lzo_adaptive_compress_test (&lzowork->ac);
- else
- return true;
- }
- return false;
-}
-
-/* Magic numbers to tell our peer if we compressed or not */
-#define YES_COMPRESS 0x66
-#define NO_COMPRESS 0xFA
-
-void
-lzo_compress (struct buffer *buf, struct buffer work,
- struct lzo_compress_workspace *lzowork,
- const struct frame* frame)
-{
- lzo_uint zlen = 0;
- int err;
- bool compressed = false;
-
- ASSERT (lzowork->defined);
-
- if (buf->len <= 0)
- return;
-
- /*
- * In order to attempt compression, length must be at least COMPRESS_THRESHOLD,
- * and our adaptive level must give the OK.
- */
- if (buf->len >= COMPRESS_THRESHOLD && lzo_compression_enabled (lzowork))
- {
- ASSERT (buf_init (&work, FRAME_HEADROOM (frame)));
- ASSERT (buf_safe (&work, LZO_EXTRA_BUFFER (PAYLOAD_SIZE (frame))));
-
- if (!(buf->len <= PAYLOAD_SIZE (frame)))
- {
- dmsg (D_COMP_ERRORS, "LZO compression buffer overflow");
- buf->len = 0;
- return;
- }
-
- err = LZO_COMPRESS (BPTR (buf), BLEN (buf), BPTR (&work), &zlen, lzowork->wmem);
- if (err != LZO_E_OK)
- {
- dmsg (D_COMP_ERRORS, "LZO compression error: %d", err);
- buf->len = 0;
- return;
- }
-
- ASSERT (buf_safe (&work, zlen));
- work.len = zlen;
- compressed = true;
-
- dmsg (D_COMP, "compress %d -> %d", buf->len, work.len);
- lzowork->pre_compress += buf->len;
- lzowork->post_compress += work.len;
-
- /* tell adaptive level about our success or lack thereof in getting any size reduction */
- if (lzowork->flags & LZO_ADAPTIVE)
- lzo_adaptive_compress_data (&lzowork->ac, buf->len, work.len);
- }
-
- /* did compression save us anything ? */
- if (compressed && work.len < buf->len)
- {
- uint8_t *header = buf_prepend (&work, 1);
- *header = YES_COMPRESS;
- *buf = work;
- }
- else
- {
- uint8_t *header = buf_prepend (buf, 1);
- *header = NO_COMPRESS;
- }
-}
-
-void
-lzo_decompress (struct buffer *buf, struct buffer work,
- struct lzo_compress_workspace *lzowork,
- const struct frame* frame)
-{
- lzo_uint zlen = EXPANDED_SIZE (frame);
- uint8_t c; /* flag indicating whether or not our peer compressed */
- int err;
-
- ASSERT (lzowork->defined);
-
- if (buf->len <= 0)
- return;
-
- ASSERT (buf_init (&work, FRAME_HEADROOM (frame)));
-
- c = *BPTR (buf);
- ASSERT (buf_advance (buf, 1));
-
- if (c == YES_COMPRESS) /* packet was compressed */
- {
- ASSERT (buf_safe (&work, zlen));
- err = LZO_DECOMPRESS (BPTR (buf), BLEN (buf), BPTR (&work), &zlen,
- lzowork->wmem);
- if (err != LZO_E_OK)
- {
- dmsg (D_COMP_ERRORS, "LZO decompression error: %d", err);
- buf->len = 0;
- return;
- }
-
- ASSERT (buf_safe (&work, zlen));
- work.len = zlen;
-
- dmsg (D_COMP, "decompress %d -> %d", buf->len, work.len);
- lzowork->pre_decompress += buf->len;
- lzowork->post_decompress += work.len;
-
- *buf = work;
- }
- else if (c == NO_COMPRESS) /* packet was not compressed */
- {
- ;
- }
- else
- {
- dmsg (D_COMP_ERRORS, "Bad LZO decompression header byte: %d", c);
- buf->len = 0;
- }
-}
-
-void
-lzo_modify_flags (struct lzo_compress_workspace *lzowork, unsigned int flags)
-{
- ASSERT (lzowork->defined);
- lzowork->flags = flags;
-}
-
-/*
- * Print statistics
- */
-void lzo_print_stats (const struct lzo_compress_workspace *lzo_compwork, struct status_output *so)
-{
- ASSERT (lzo_compwork->defined);
-
- status_printf (so, "pre-compress bytes," counter_format, lzo_compwork->pre_compress);
- status_printf (so, "post-compress bytes," counter_format, lzo_compwork->post_compress);
- status_printf (so, "pre-decompress bytes," counter_format, lzo_compwork->pre_decompress);
- status_printf (so, "post-decompress bytes," counter_format, lzo_compwork->post_decompress);
-}
-
-#else
-static void dummy(void) {}
-#endif /* USE_LZO */
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