Imported Upstream version 2.2.1upstream/2.2.1

1 files changed, 136 insertions, 0 deletions

diff --git a/lzo.h b/lzo.h
new file mode 100644
index 0000000..bb15753
--- /dev/null
+++ b/lzo.h
@@ -0,0 +1,136 @@
+/*
+ *  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