public static byte[] Encode(ulong integer)
{
int requiredBytes;
if (integer <= byte.MaxValue >> 2) /* 63 */
{
requiredBytes = 1;
}
else if (integer <= ushort.MaxValue >> 2) /* 16383 */
{
requiredBytes = 2;
}
else if (integer <= uint.MaxValue >> 2) /* 1073741823 */
{
requiredBytes = 4;
}
else if (integer <= ulong.MaxValue >> 2) /* 4611686018427387903 */
{
requiredBytes = 8;
}
else
{
throw new ArgumentOutOfRangeException(nameof(integer),
"Value is larger than VariableInteger.MaxValue.");
}
var offset = 8 - requiredBytes;
var uInt64Bytes = ByteUtilities.GetBytes(integer);
var first = uInt64Bytes[offset];
first = (byte)(first | ((requiredBytes / 2) << 6));
uInt64Bytes[offset] = first;
var result = new byte[requiredBytes];
Buffer.BlockCopy(uInt64Bytes, offset, result, 0, requiredBytes);
return(result);
}
public static byte[] Encode(UInt64 integer)
{
int requiredBytes = 0;
if (integer <= byte.MaxValue >> 2) /* 63 */
{
requiredBytes = 1;
}
else if (integer <= UInt16.MaxValue >> 2) /* 16383 */
{
requiredBytes = 2;
}
else if (integer <= UInt32.MaxValue >> 2) /* 1073741823 */
{
requiredBytes = 4;
}
else if (integer <= UInt64.MaxValue >> 2) /* 4611686018427387903 */
{
requiredBytes = 8;
}
else
{
throw new ArgumentOutOfRangeException("Value is larger than VariableInteger.MaxValue.");
}
int offset = 8 - requiredBytes;
byte[] uInt64Bytes = ByteUtilities.GetBytes(integer);
byte first = uInt64Bytes[offset];
first = (byte)(first | (requiredBytes / 2) << 6);
uInt64Bytes[offset] = first;
byte[] result = new byte[requiredBytes];
Buffer.BlockCopy(uInt64Bytes, offset, result, 0, requiredBytes);
return(result);
}
public uint ReadUInt32()
{
return(ByteUtilities.ToUInt32(ReadBytes(4)));
}
public ushort ReadUInt16()
{
var bytes = ReadBytes(2);
return(ByteUtilities.ToUInt16(bytes));
}