public static EcmaValue ToBigUIntN(EcmaValue value, int bits)
{
value = value.ToBigInt();
if (bits <= 0)
{
return(value0n);
}
if (bits == 64)
{
return(ToBigUInt64(value));
}
if (EcmaValue.GetNumberCoercion(value) == EcmaNumberType.BigInt64)
{
if (bits > 64)
{
return(ToBigInt(unchecked ((ulong)value.ToInt64())));
}
long v = value.ToInt64();
long mask = (1 << bits) - 1;
return(ToBigInt(unchecked ((ulong)(v & mask))));
}
BigInteger u = ToBigInteger(value);
BigInteger bitsm0 = BigInteger.Pow(2, bits);
BigInteger rem = BigInteger.Remainder(u, bitsm0);
return(ToBigInt(rem < 0 ? rem + bitsm0 : rem));
}
public static EcmaValue ToBigIntN(EcmaValue value, int bits)
{
value = value.ToBigInt();
if (bits <= 0)
{
return(value0n);
}
if (bits == 64)
{
return(ToBigInt64(value));
}
if (EcmaValue.GetNumberCoercion(value) == EcmaNumberType.BigInt64)
{
if (bits > 64)
{
return(value);
}
long r = 1 << bits;
long m = 1 << (bits - 1);
long v = value.ToInt64() % r;
return(ToBigInt(v < -m ? v + r : v >= m ? v - r : v));
}
BigInteger u = ToBigInteger(value);
BigInteger bitsm0 = BigInteger.Pow(2, bits);
BigInteger bitsm1 = BigInteger.Pow(2, bits - 1);
BigInteger rem = BigInteger.Remainder(u, bitsm0);
return(ToBigInt(rem < -bitsm1 ? rem + bitsm1 : rem >= bitsm1 ? rem - bitsm0 : rem));
}
public static EcmaValue ToBigInt64(this EcmaValue value)
{
value = value.ToBigInt();
if (EcmaValue.GetNumberCoercion(value) == EcmaNumberType.BigInt64)
{
return(value);
}
byte[] byteArray = ((BigInteger)value.GetUnderlyingObject()).ToByteArray();
return(ToBigInt(BitConverter.ToInt64(byteArray, 0)));
}
public static EcmaValue ToBigUInt64(this EcmaValue value)
{
value = value.ToBigInt();
if (EcmaValue.GetNumberCoercion(value) == EcmaNumberType.BigInt64)
{
long v = value.ToInt64();
return(v >= mod63?ToBigInt(new BigInteger(unchecked ((ulong)v))) : value);
}
BigInteger rem = BigInteger.Remainder((BigInteger)value.GetUnderlyingObject(), mod64);
return(ToBigInt(rem < 0 ? rem + mod64 : rem));
}
