public async Task <VInt> ParseNextVInt()
{
const int byteSize = 8;
const int vintDataSizePerByte = byteSize - 1;
var buffer = new byte[byteSize];
await DataAccessor.ReadAsync(buffer, 0, 1).ConfigureAwait(false);
if (buffer[0] == 0)
{
throw new FileNotLoadedException($"VInt at position {DataAccessor.Position - 1:X} was not initialized");
}
var vintWidth = vintDataSizePerByte - buffer[0].GetMostSignificantBit();
// Validate range. It actually can't be outside this range, therefore its just a temporary assert
Debug.Assert(vintWidth <= vintDataSizePerByte && vintWidth >= 0, "Invalid Vint Width");
await DataAccessor.ReadAsync(buffer, 1, vintWidth).ConfigureAwait(false);
if (buffer.All(x => x == 0))
{
throw new FileNotLoadedException($"VInt at position {DataAccessor.Position - 1 - vintWidth:X} was not initialized");
}
buffer = Utility.ConvertEndiannes(buffer, vintWidth + 1);
var value = BitConverter.ToInt64(buffer, 0);
return(VInt.FromValue(value));
}