signed-vs-unsigned.linq

<Query Kind="Program" />

void Main()
{
	Console.WriteLine($" {"value"} {"short",cs} {"ushort->short",cs} {"short->int",cs} {"ushort",cs} {"short->ushort",cs} {"ushort->int",cs}  notes");
	PrintShort(new byte[] { 0x00, 0x00 });
	PrintShort(new byte[] { 0x00, 0x01 });
	PrintShort(new byte[] { 0x7f, 0xfe });
	PrintShort(new byte[] { 0x7f, 0xff });
	PrintShort(new byte[] { 0x80, 0x00 });
	PrintShort(new byte[] { 0x80, 0x01 });
	PrintShort(new byte[] { 0xff, 0xfe });
	PrintShort(new byte[] { 0xff, 0xff });
	
	//  value          short  ushort->short     short->int         ushort  short->ushort    ushort->int  notes
	// 0x0000              0              0              0              0              0              0  ushort.MinValue
	// 0x0001              1              1              1              1              1              1  
	// 0x7FFE          32766          32766          32766          32766          32766          32766  
	// 0x7FFF          32767          32767          32767          32767          32767          32767  short.MaxValue
	// 0x8000         -32768         -32768         -32768          32768          32768          32768  short.MinValue
	// 0x8001         -32767         -32767         -32767          32769          32769          32769  
	// 0xFFFE             -2             -2             -2          65534          65534          65534  
	// 0xFFFF             -1             -1             -1          65535          65535          65535  ushort.MaxValue
}

const int cs = 14;

void PrintShort(byte[] val)
{
	if (BitConverter.IsLittleEndian)
		Array.Reverse(val);

	var notes = new List<string>();
	
	var int16 = BitConverter.ToInt16(val, 0);
	if (int16 == short.MinValue)
		notes.Add("short.MinValue");
	if (int16 == short.MaxValue)
		notes.Add("short.MaxValue");

	var uint16 = BitConverter.ToUInt16(val, 0);
	if (uint16 == ushort.MinValue)
		notes.Add("ushort.MinValue");
	if (uint16 == ushort.MaxValue)
		notes.Add("ushort.MaxValue");
	
	Console.WriteLine($"0x{uint16:X4} {int16,cs} {(short)uint16,cs} {(int)int16,cs} {uint16,cs} {(ushort)int16,cs} {(int)uint16,cs}  {string.Join(", ", notes)}");
}