public static UInt64 ReadVarInt(this BinaryReader reader, ref byte[] bytes, ref int offset)
{
DataDecoder.SizeAtLeast(ref bytes, offset + 1);
reader.ReadExactly(bytes, offset, 1);
UInt64 value = bytes[offset];
offset += 1;
if (value < 0xFD)
{
return(value);
}
else if (value == 0xFD)
{
DataDecoder.SizeAtLeast(ref bytes, offset + 2);
reader.ReadExactly(bytes, offset, 2);
value = Bits.ToUInt16(bytes, offset);
offset += 2;
return(value);
}
else if (value == 0xFE)
{
DataDecoder.SizeAtLeast(ref bytes, offset + 4);
reader.ReadExactly(bytes, offset, 4);
value = Bits.ToUInt32(bytes, offset);
offset += 4;
return(value);
}
else if (value == 0xFF)
{
DataDecoder.SizeAtLeast(ref bytes, offset + 8);
reader.ReadExactly(bytes, offset, 8);
value = Bits.ToUInt64(bytes, offset);
offset += 8;
return(value);
}
else
{
throw new Exception();
}
}
