public static BERNode Create(Stream strm)
{
BERNode ret = null;
Tag tg = BER.DecodeTag(strm);
uint lenght = 0;
bool indefiniteForm;
BER.DecodeLength(strm, out lenght, out indefiniteForm);
if (tg.isPrimitive)
{
byte[] data = new byte[lenght];
if (strm.Read(data, 0, (int)lenght) != lenght)
throw new LengthMismatchException();
ret = new BERNodePrimitive(tg, data);
}
else
{
BERNodeConstructed retCon = new BERNodeConstructed(tg);
ret = retCon;
// if (lenght == 0 && (strm.Position != strm.Length))
if (indefiniteForm)
{
while (!BER.AreNextTwoBytesZeros(strm))
{
retCon.m_children.Add(Create(strm));
}
BER.DecodeTwoZeros(strm);
}
else
{
long initPos = strm.Position;
while (strm.Position < initPos + lenght)
{
retCon.m_children.Add(Create(strm));
}
if (strm.Position != initPos + lenght)
throw new LengthMismatchException();
}
}
return ret;
}
public static IEnumerable<BERNode> GetNodes(Stream strm)
{
BERNode ret = null;
Tag tg = BER.DecodeTag(strm);
uint lenght = 0;
bool indefiniteForm;
BER.DecodeLength(strm, out lenght, out indefiniteForm);
if (tg.isPrimitive)
{
byte[] data = new byte[lenght];
if (strm.Read(data, 0, (int)lenght) != lenght)
throw new LengthMismatchException();
ret = new BERNodePrimitive(tg, data);
yield return ret;
}
else
{
yield return new BERNodeConstructed(tg);
if (indefiniteForm)
{
while (!BER.AreNextTwoBytesZeros(strm))
{
foreach(BERNode n in GetNodes(strm))
yield return n;
}
BER.DecodeTwoZeros(strm);
}
else
{
long initPos = strm.Position;
while (strm.Position < initPos + lenght)
{
foreach (BERNode n in GetNodes(strm))
yield return n;
}
if (strm.Position != initPos + lenght)
throw new LengthMismatchException();
}
}
}
