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/* ****************************************************************************

*

* Copyright (c) Microsoft Corporation.

*

* This source code is subject to terms and conditions of the Apache License, Version 2.0. A

* copy of the license can be found in the License.html file at the root of this distribution. If

* you cannot locate the Apache License, Version 2.0, please send an email to

* ironpy@microsoft.com. By using this source code in any fashion, you are agreeing to be bound

* by the terms of the Apache License, Version 2.0.

*

* You must not remove this notice, or any other, from this software.

*

*

* ***************************************************************************/

#if CLR2

using Microsoft.Scripting.Math;

#else

using System.Numerics;

using Microsoft.Scripting.Utils;

#endif

namespace IronPythonTest {

public static class System_Scripting_Math {

public static BigInteger CreateBigInteger(int sign, params uint[] data) {

#if CLR2

return new BigInteger(sign, data);

#else

ContractUtils.RequiresNotNull(data, "data");

ContractUtils.Requires(sign >= -1 && sign <= +1, "sign");

int length = data.Length - 1;

while (length >= 0 && data[length] == 0) length--;

length++;

ContractUtils.Requires(length == 0 || sign != 0, "sign");

if (length == 0) {

return BigInteger.Zero;

}

bool highest = (data[length - 1] & 0x80000000) != 0;

byte[] dataBytes = new byte[length * 4 + (highest ? 1 : 0)];

int j = 0;

for (int i = 0; i < length; i++) {

ulong w = data[i];

dataBytes[j++] = (byte)(w & 0xff);

dataBytes[j++] = (byte)((w >> 8) & 0xff);

dataBytes[j++] = (byte)((w >> 16) & 0xff);

dataBytes[j++] = (byte)((w >> 24) & 0xff);

}

BigInteger res = new BigInteger(dataBytes);

return sign < 0 ? -res : res;

#endif

}

}

}