Fix Convert::NativeToInt64 for multiple base conversions

[MatthiasJentsch]

Description

A few tweaks for fixing issue #412: Convert::NativeToInt64 with SUPPORT_ANY_BASE_CONVERSION delivers incorrect results

Motivation and Context

• Fixes Convert::NativeToInt64 with SUPPORT_ANY_BASE_CONVERSION delivers incorrect results Home#412

How Has This Been Tested?

Tested with various Convert.Toxxx calls. All deliver the correct results. Here is the test code:

using System;

namespace NFApp2
{
	public class Program
	{
		public static void Main()
		{
			// -42
			// binary
			sbyte b1 = Convert.ToSByte("11010110", 2);
			// octal
			sbyte b2 = Convert.ToSByte("326", 8);
			// decimal
			sbyte b3 = Convert.ToSByte("-42");
			// hexadecimal
			sbyte b4 = Convert.ToSByte("D6", 16);

			// -17078
			// binary
			short x1 = Convert.ToInt16("1011110101001010", 2);
			// octal
			short x2 = Convert.ToInt16("136512", 8);
			// decimal
			short x3 = Convert.ToInt16("-17078");
			// hexadecimal
			short x4 = Convert.ToInt16("BD4A", 16);

			// -1234567890
			// binary
			int i1 = Convert.ToInt32("10110110011010011111110100101110", 2);
			// octal
			int i2 = Convert.ToInt32("26632376456", 8);
			// decimal
			int i3 = Convert.ToInt32("-1234567890");
			// hexadecimal
			int i4 = Convert.ToInt32("B669FD2E", 16);

			// -4446419168141639693
			// binary
			long l1 = Convert.ToInt64("1100001001001011001001010101001100100000011011011111111111110011", 2);
			// octal
			long l2 = Convert.ToInt64("1411131125144033377763", 8);
			// decimal
			long l3 = Convert.ToInt64("-4446419168141639693");
			// hexadecimal
			long l4 = Convert.ToInt64("C24B2553206DFFF3", 16);

			// 14000324905567911923
			// binary
			ulong u1 = Convert.ToUInt64("1100001001001011001001010101001100100000011011011111111111110011", 2);
			// octal
			ulong u2 = Convert.ToUInt64("1411131125144033377763", 8);
			// decimal
			ulong u3 = Convert.ToUInt64("14000324905567911923");
			// hexadecimal
			ulong u4 = Convert.ToUInt64("C24B2553206DFFF3", 16);
		}
	}
}

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: Matthias Jentsch info@matthias-jentsch.de

[nfbot]

Hi @MatthiasJentsch,

I'm nanoFramework bot.
Thank you for your contribution!

A human will be reviewing it shortly. 😉

[josesimoes]

LGTM