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sfmemcap.c
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sfmemcap.c
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/****************************************************************************
*
* Copyright (C) 2003-2009 Sourcefire, Inc.
*
* 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. You may not use, modify or
* distribute this program under any other version of the GNU General
* Public License.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
****************************************************************************/
/*
sfmemcap.c
These functions wrap the alloc & free functions. They enforce a memory cap using
the MEMCAP structure. The MEMCAP structure tracks memory usage. Each allocation
has 4 bytes added to it so we can store the allocation size. This allows us to
free a block and accurately track how much memory was recovered.
Marc Norton
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "sfmemcap.h"
#include "util.h"
/*
* Set max # bytes & init other variables.
*/
void sfmemcap_init( MEMCAP * mc, unsigned int nbytes )
{
mc->memcap = nbytes;
mc->memused= 0;
mc->nblocks= 0;
}
/*
* Create and Init a MEMCAP - use free to release it
*/
MEMCAP * sfmemcap_new( unsigned int nbytes )
{
MEMCAP * mc;
mc = (MEMCAP*)calloc(1,sizeof(MEMCAP));
if( mc ) sfmemcap_init( mc, nbytes );
return mc;
}
/*
* Release the memcap structure
*/
void sfmemcap_delete( MEMCAP * p )
{
if(p)free( p );
}
/*
* Allocate some memory
*/
void * sfmemcap_alloc( MEMCAP * mc, unsigned int nbytes )
{
long * data;
//printf("sfmemcap_alloc: %d bytes requested, memcap=%d, used=%d\n",nbytes,mc->memcap,mc->memused);
nbytes += sizeof(long);
/* Check if we are limiting memory use */
if( mc->memcap > 0 )
{
/* Check if we've maxed out our memory - if we are tracking memory */
if( (mc->memused + nbytes) > mc->memcap )
{
return 0;
}
}
//data = (long *) malloc( nbytes );
data = (long *)SnortAlloc( nbytes );
if( data == NULL )
{
return 0;
}
*data++ = (long)nbytes;
mc->memused += nbytes;
mc->nblocks++;
return data;
}
/*
* Free some memory
*/
void sfmemcap_free( MEMCAP * mc, void * p )
{
long * q;
q = (long*)p;
q--;
mc->memused -= (unsigned int)(*q);
mc->nblocks--;
free(q);
}
/*
* For debugging.
*/
void sfmemcap_showmem( MEMCAP * mc )
{
fprintf(stderr, "memcap: memcap = %u bytes,",mc->memcap);
fprintf(stderr, " memused= %u bytes,",mc->memused);
fprintf(stderr, " nblocks= %d blocks\n",mc->nblocks);
}
/*
* String Dup Some memory.
*/
char * sfmemcap_strdup( MEMCAP * mc, const char *str )
{
char *data = NULL;
int data_size;
data_size = strlen(str) + 1;
data = (char *)sfmemcap_alloc(mc, data_size);
if(data == NULL)
{
return 0 ;
}
SnortStrncpy(data, str, data_size);
return data;
}
/*
* Dup Some memory.
*/
void * sfmemcap_dupmem( MEMCAP * mc, void * src, int n )
{
void * data = (char *)sfmemcap_alloc( mc, n );
if(data == NULL)
{
return 0;
}
memcpy( data, src, n );
return data;
}