internal OpenPgpPacketHeader(byte firstByte, Stream inputStream)
{
if ((firstByte & NewHeaderHighBits) != NewHeaderHighBits)
{
throw new ArgumentException();
}
_TagId = firstByte & ~NewHeaderHighBits;
// See 4.2.2.1: "A one-octet Body Length header encodes a length of 0 to 191 octets."
int firstLengthByte = inputStream.ReadByte();
if (firstLengthByte < 0)
{
throw new EndOfStreamException();
}
if (firstLengthByte < 192)
{
Length = firstLengthByte;
return;
}
// See 4.2.2.2: "A two-octet Body Length header encodes a length of 192 to 8383 octets."
if ((firstLengthByte >= 192) && (firstLengthByte <= 223))
{
int secondLengthByte = inputStream.ReadByte();
if (secondLengthByte < 0)
{
throw new EndOfStreamException();
}
Length = ((firstLengthByte - 192) << 8) + secondLengthByte + 192;
return;
}
// 4.2.2.3: "A five-octet Body Length header consists of a single octet holding the value 255, followed by a four-octet scalar."
if (firstLengthByte != 255)
{
throw new InvalidDataException();
}
Length = OpenPgpScalarNumber.Read(inputStream, 4);
}
public virtual void WriteTo(Stream outputStream)
{
outputStream.WriteByte((byte)(NewHeaderHighBits | TagId));
if (Length <= 191)
{
outputStream.WriteByte((byte)Length);
}
else if (Length <= 8383)
{
int bodyLenRemainder = (int)(Length - 192);
byte secondLengthByte = (byte)(bodyLenRemainder & 0xFF);
bodyLenRemainder >>= 8;
byte firstLengthByte = (byte)(bodyLenRemainder + 192);
outputStream.WriteByte(firstLengthByte);
outputStream.WriteByte(secondLengthByte);
}
else
{
outputStream.WriteByte(0xFF);
OpenPgpScalarNumber.WriteTo((uint)Length, outputStream);
}
}
public void WriteTo(Stream outputStream)
{
OpenPgpScalarNumber.WriteTo((uint)(Date - Epoch).TotalSeconds, outputStream);
}
public static OpenPgpTimeField Read(Stream inputStream)
{
return(new OpenPgpTimeField(OpenPgpScalarNumber.Read(inputStream, 4)));
}
