ssldump/common/lib/r_bitfield.c

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2015-01-31 09:13:33 +00:00
/**
r_bitfield.c
Copyright (C) 2001 RTFM, Inc.
All Rights Reserved.
ekr@rtfm.com Wed Oct 3 11:15:23 2001
*/
#include <r_common.h>
#include "r_bitfield.h"
int r_bitfield_create(setp,size)
r_bitfield **setp;
UINT4 size;
{
r_bitfield *set=0;
int _status;
int num_words=size/32+!!(size%32);
if(!(set=(r_bitfield *)RMALLOC(sizeof(r_bitfield))))
ABORT(R_NO_MEMORY);
if(!(set->data=(UINT4 *)RMALLOC(num_words*4)))
ABORT(R_NO_MEMORY);
memset(set->data,0,4*num_words);
set->base=0;
set->len=num_words;
*setp=set;
_status=0;
abort:
if(_status){
r_bitfield_destroy(&set);
}
return(_status);
}
int r_bitfield_destroy(setp)
r_bitfield **setp;
{
r_bitfield *set;
if(!setp || !*setp)
return(0);
set=*setp;
RFREE(set->data);
RFREE(set);
*setp=0;
return(0);
}
int r_bitfield_set(set,bit)
r_bitfield *set;
int bit;
{
int word=(bit-set->base)/32;
int bbit=(bit-set->base)%32;
int _status;
/* Resize? */
if(word>set->len){
UINT4 newlen=set->len;
UINT4 *tmp;
while(newlen<word)
newlen*=2;
if(!(tmp=(UINT4 *)RMALLOC(newlen)))
ABORT(R_NO_MEMORY);
memcpy(tmp,set->data,set->len*4);
memset(tmp+set->len*4,0,(newlen-set->len)*4);
RFREE(set->data);
set->data=tmp;
}
set->data[word]|=1<<bbit;
_status=0;
abort:
return(_status);
}
int r_bitfield_isset(set,bit)
r_bitfield *set;
int bit;
{
int word=(bit-set->base)/32;
int bbit=(bit-set->base)%32;
int _status;
if(bit<set->base)
return(0);
/* Resize? */
if(word>set->len)
return(0);
return(set->data[word]&(1<<bbit));
}