/*************************************************************************
* Copyright (C) 2002 Intel Corporation
*
* Licensed under the Apache License,  Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* 	http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law  or agreed  to  in  writing,  software
* distributed under  the License  is  distributed  on  an  "AS IS"  BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the  specific  language  governing  permissions  and
* limitations under the License.
*************************************************************************/

/*
//               Intel(R) Cryptography Primitives Library
//
//  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);

    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;
}
