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lfd_lzo.c
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lfd_lzo.c
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/*
vtrunkd - Virtual Tunnel Trunking over TCP/IP network.
Copyright (C) 2011 Andrew Gryaznov <realgrandrew@gmail.com>
Vtrunkd has been derived from VTUN package by Maxim Krasnyansky.
vtun Copyright (C) 1998-2000 Maxim Krasnyansky <max_mk@yahoo.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
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.
*/
/*
* lfd_lzo.c,v 1.1.1.2.2.7.2.1 2006/11/16 04:03:00 mtbishop Exp
*/
/* LZO compression module */
#include "config.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <syslog.h>
#include "vtun.h"
#include "linkfd.h"
#include "lib.h"
#ifdef HAVE_LZO
#include "lzo1x.h"
#include "lzoutil.h"
static lzo_byte *zbuf;
static lzo_voidp wmem;
static int zbuf_size = VTUN_FRAME_SIZE * VTUN_FRAME_SIZE / 64 + 16 + 3;
/* Pointer to compress function */
int (*lzo1x_compress)(const lzo_byte *src, lzo_uint src_len,
lzo_byte *dst, lzo_uint *dst_len,
lzo_voidp wrkmem);
/*
* Initialize compressor/decompressor.
* Allocate the buffers.
*/
int alloc_lzo(struct vtun_host *host)
{
int zlevel = host->zlevel ? host->zlevel : 1;
int mem;
switch( zlevel ){
case 9:
lzo1x_compress = lzo1x_999_compress;
mem = LZO1X_999_MEM_COMPRESS;
break;
default:
lzo1x_compress = lzo1x_1_15_compress;
mem = LZO1X_1_15_MEM_COMPRESS;
break;
}
if( lzo_init() != LZO_E_OK ){
vtun_syslog(LOG_ERR,"Can't initialize compressor");
return 1;
}
if( !(zbuf = lfd_alloc(zbuf_size)) ){
vtun_syslog(LOG_ERR,"Can't allocate buffer for the compressor");
return 1;
}
if( !(wmem = lzo_malloc(mem)) ){
vtun_syslog(LOG_ERR,"Can't allocate buffer for the compressor");
return 1;
}
vtun_syslog(LOG_INFO, "LZO compression[level %d] initialized", zlevel);
return 0;
}
/*
* Deinitialize compressor/decompressor.
* Free the buffer.
*/
int free_lzo()
{
lfd_free(zbuf); zbuf = NULL;
lzo_free(wmem); wmem = NULL;
return 0;
}
/*
* This functions _MUST_ consume all incoming bytes in one pass,
* that's why we expand buffer dynamicly.
*/
int comp_lzo(int len, char *in, char **out)
{
unsigned int zlen = 0;
int err;
if( (err=lzo1x_compress((void *)in,len,zbuf,&zlen,wmem)) != LZO_E_OK ){
vtun_syslog(LOG_ERR,"Compress error %d",err);
return -1;
}
*out = (void *)zbuf;
return zlen;
}
int decomp_lzo(int len, char *in, char **out)
{
unsigned int zlen = 0;
int err;
if( (err=lzo1x_decompress((void *)in,len,zbuf,&zlen,wmem)) != LZO_E_OK ){
vtun_syslog(LOG_ERR,"Decompress error %d",err);
return -1;
}
*out = (void *) zbuf;
return zlen;
}
struct lfd_mod lfd_lzo = {
"LZO",
alloc_lzo,
comp_lzo,
NULL,
decomp_lzo,
NULL,
free_lzo,
NULL,
NULL
};
#else /* HAVE_LZO */
int no_lzo(struct vtun_host *host)
{
vtun_syslog(LOG_INFO, "LZO compression is not supported");
return -1;
}
struct lfd_mod lfd_lzo = {
"LZO",
no_lzo, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
#endif /* HAVE_LZO */