/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, 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 Microsoft Public License.
*
* 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
}
}
}
|