160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/*
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VTun - Virtual Tunnel over TCP/IP network.
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Copyright (C) 1998-2000 Maxim Krasnyansky <max_mk@yahoo.com>
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VTun has been derived from VPPP package by Maxim Krasnyansky.
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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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*/
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/*
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* $Id: lfd_lzo.c,v 1.5.2.2 2007/06/29 05:26:06 mtbishop Exp $
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*/
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/* LZO compression module */
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#include "config.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include "vtun.h"
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#include "linkfd.h"
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#include "lib.h"
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#ifdef HAVE_LZO
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#include "lzo1x.h"
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#include "lzoutil.h"
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static lzo_byte *zbuf;
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static lzo_voidp wmem;
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static int zbuf_size = VTUN_FRAME_SIZE * VTUN_FRAME_SIZE / 64 + 16 + 3;
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/* Pointer to compress function */
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int (*lzo1x_compress)(const lzo_byte *src, lzo_uint src_len,
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lzo_byte *dst, lzo_uint *dst_len,
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lzo_voidp wrkmem);
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/*
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* Initialize compressor/decompressor.
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* Allocate the buffers.
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*/
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int alloc_lzo(struct vtun_host *host)
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{
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int zlevel = host->zlevel ? host->zlevel : 1;
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int mem;
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switch( zlevel ){
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case 9:
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lzo1x_compress = lzo1x_999_compress;
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mem = LZO1X_999_MEM_COMPRESS;
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break;
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default:
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lzo1x_compress = lzo1x_1_15_compress;
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mem = LZO1X_1_15_MEM_COMPRESS;
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break;
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}
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if( lzo_init() != LZO_E_OK ){
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vtun_syslog(LOG_ERR,"Can't initialize compressor");
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return 1;
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}
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if( !(zbuf = lfd_alloc(zbuf_size)) ){
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vtun_syslog(LOG_ERR,"Can't allocate buffer for the compressor");
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return 1;
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}
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if( !(wmem = lzo_malloc(mem)) ){
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vtun_syslog(LOG_ERR,"Can't allocate buffer for the compressor");
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return 1;
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}
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vtun_syslog(LOG_INFO, "LZO compression[level %d] initialized", zlevel);
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return 0;
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}
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/*
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* Deinitialize compressor/decompressor.
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* Free the buffer.
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*/
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int free_lzo()
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{
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lfd_free(zbuf); zbuf = NULL;
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lzo_free(wmem); wmem = NULL;
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return 0;
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}
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/*
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* This functions _MUST_ consume all incoming bytes in one pass,
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* that's why we expand buffer dynamicly.
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*/
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int comp_lzo(int len, char *in, char **out)
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{
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unsigned int zlen = 0;
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int err;
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if( (err=lzo1x_compress((void *)in,len,zbuf,&zlen,wmem)) != LZO_E_OK ){
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vtun_syslog(LOG_ERR,"Compress error %d",err);
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return -1;
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}
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*out = (void *)zbuf;
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return zlen;
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}
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int decomp_lzo(int len, char *in, char **out)
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{
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unsigned int zlen = 0;
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int err;
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if( (err=lzo1x_decompress((void *)in,len,zbuf,&zlen,wmem)) != LZO_E_OK ){
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vtun_syslog(LOG_ERR,"Decompress error %d",err);
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return -1;
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}
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*out = (void *) zbuf;
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return zlen;
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}
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struct lfd_mod lfd_lzo = {
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"LZO",
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alloc_lzo,
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comp_lzo,
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NULL,
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decomp_lzo,
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NULL,
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free_lzo,
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NULL,
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NULL
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};
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#else /* HAVE_LZO */
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int no_lzo(struct vtun_host *host)
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{
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vtun_syslog(LOG_INFO, "LZO compression is not supported");
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return -1;
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}
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struct lfd_mod lfd_lzo = {
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"LZO",
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no_lzo, NULL, NULL, NULL, NULL, NULL, NULL, NULL
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};
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#endif /* HAVE_LZO */
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