/// <summary>
/// Decodes a tag to a label.
/// </summary>
private string ReadLabel()
{
// by Pedro Martins
string label = "";
uint tag = 0;
// get tag bytes
byte[] tagBytes = new byte[3];
_stream.Read(tagBytes, 0, 3);
// resize tag byte array (add an empty byte)
Array.Resize(ref tagBytes, 4);
// read tag value (as uint32) from tag byte array
tag = BitConverter.ToUInt32(tagBytes, 0);
// convert to little endian
tag = Utils.SwapBytes(tag) >> 8;
// convert tag to label
label += Convert.ToChar((((tag >> 18) & 0x3F) & 0x1F) | 64);
label += Convert.ToChar((((tag >> 12) & 0x3F) & 0x1F) | 64);
label += Convert.ToChar((((tag >> 6) & 0x3F) & 0x1F) | 64);
label += Convert.ToChar(((tag & 0x3F) & 0x1F) | 64);
// clean label
label = Regex.Replace(label, "[^A-Z]+", "");
return(label);
}
/// <summary>
/// Encodes a label to tag.
/// </summary>
/// <param name="label">Label to write.</param>
private void WriteLabel(string label)
{
// by Pedro Martins
int tag = 0;
for (int i = 0; i < label.Length; i++)
{
tag |= (0x20 | (label[i] & 0x1F)) << (3 - i) * 6;
}
uint sTag = Utils.SwapBytes(Convert.ToUInt32(tag)) >> 8;
// hackhackhack
// FIXME
MemoryStream hehStream = new MemoryStream();
BinaryWriter hehWriter = new BinaryWriter(hehStream);
hehWriter.Write(sTag);
_stream.Write(hehStream.GetBuffer().Take(3).ToArray(), 0, 3);
}
