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/* Author : Rahul G rahul@smartbridges.com */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/* This function takes the oid in dot format ( 1.3.6.1.4.410.... ) and encodes
* the oid using ber rules. oid_out should be allocated by the application..
* encode_oid returns the length of the encoded buffer.
*/
int encode_oid(char* oid, unsigned char* oid_out)
{
char* ptr;
int count=0, oct_count=2;
int num_val=0, oct1=0;
char val[32];
int last=0,len=0;
oid_out[0]=0x06 ; /* 00000110 */
while(( (ptr=strchr(oid,'.')) != 0) || last == 0 )
{
if(ptr != 0)
len=ptr-oid;
else
len=strlen(oid);
strncpy(val,oid,len);
val[len]='\0';
num_val=atoi(val);
/*get the first two sub id's*/
if(count == 0)
{
oct1=40* num_val;
count++;
oid=ptr+1;
continue;
}
if(count == 1)
{
oct1+=num_val;
oid_out[oct_count]=oct1;
oct_count++;
oid=ptr+1;
count++;
continue;
}
else
{
int i, loop, j;
for(i=31;i>= 0; i--)
{
unsigned int mask= (num_val>>(i)) & ~(~0x0000<<1);
if(mask)
{
i++;
break;
}
}
loop= i/ 7;
for(j=loop; j>= 0; j--)
{
oid_out[oct_count]= (num_val >> (j*7)) & ~(~0x0000 << 7);
oid_out[oct_count] |= 0x80; /* turn the msb to 1 */
oct_count++;
}
oid_out[oct_count - 1] &= 0x7f; /* turn the msb back to zero for the last octect */
}
if(ptr != 0)
{
oid=ptr+1;
}
else
{
last=1;
}
}
//Insert the octect length
oid_out[1]=oct_count-2;
return oct_count;
}
/*
int main()
{
unsigned char oid_ut[512];
int k,ret;
// ret=encode_oid("1.3.6.1.4.1.410.1.1.1.1.0",oid_ut);
ret=encode_oid("1.2.840.113549.1",oid_ut);
for(k=0; k< ret; k++)
printf("%.2x ",oid_ut[k]);
printf("\n");
return 0;
}
*/
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