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/* 
//               Intel(R) Integrated Performance Primitives
//                   Cryptographic Primitives (ippcp)
// 
//  Contents:
//     ippsCmpZero_BN()
// 
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpbn.h"
#include "pcptool.h"


/*F*
//    Name: ippsCmpZero_BN
//
// Purpose: Compare BigNum value with zero.
//
// Returns:                Reason:
//    ippStsNullPtrErr        pBN == NULL
//                            pResult == NULL
//    ippStsContextMatchErr   !BN_VALID_ID(pBN)
//    ippStsNoErr             no errors
//
// Parameters:
//    pBN      BigNum ctx
//    pResult  result of comparison
//
*F*/
IPPFUN(IppStatus, ippsCmpZero_BN, (const IppsBigNumState* pBN, Ipp32u* pResult))
{
   IPP_BAD_PTR2_RET(pBN, pResult);

   pBN = (IppsBigNumState*)( IPP_ALIGNED_PTR(pBN, BN_ALIGNMENT) );
   IPP_BADARG_RET(!BN_VALID_ID(pBN), ippStsContextMatchErr);

   if(BN_SIZE(pBN)==1 && BN_NUMBER(pBN)[0]==0)
      *pResult = IS_ZERO;
   else if (BN_SIGN(pBN)==ippBigNumPOS)
      *pResult = GREATER_THAN_ZERO;
   else if (BN_SIGN(pBN)==ippBigNumNEG)
      *pResult = LESS_THAN_ZERO;

   return ippStsNoErr;
}