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Copy pathIronMath.cs
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38 lines (32 loc) · 1.4 KB
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
using System.Numerics;
using Microsoft.Scripting.Utils;
namespace IronPythonTest {
public static class System_Scripting_Math {
public static BigInteger CreateBigInteger(int sign, params uint[] data) {
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;
}
}
}