/// <summary>
/// Generate node text header. This method is used by GetNodeText to put heading.
/// </summary>
/// <param name="lineLen">Line length.</param>
/// <returns>Header string.</returns>
static public string GetNodeTextHeader(int lineLen)
{
string header = String.Format("Offset| Len |LenByte|\r\n");
header += "======+======+=======+" + Asn1Util.GenStr(lineLen + 10, '=') + "\r\n";
return(header);
}
/// <summary>
/// Encode single OID value.
/// </summary>
/// <param name="bt">output stream.</param>
/// <param name="v">source value.</param>
protected void EncodeValue(Stream bt, ulong v)
{
for (int i = (Asn1Util.BitPrecision(v) - 1) / 7; i > 0; i--)
{
bt.WriteByte((byte)(0x80 | ((v >> (i * 7)) & 0x7f)));
}
bt.WriteByte((byte)(v & 0x7f));
}
/// <summary>
/// Retrieve PEM file heading.
/// </summary>
/// <param name="fileName">source file name.</param>
/// <returns>heading string.</returns>
public static string GetPemFileHeader(string fileName)
{
try
{
FileStream fs = new FileStream(fileName, FileMode.Open);
byte[] data = new byte[fs.Length];
fs.Read(data, 0, data.Length);
fs.Close();
string dataStr = Asn1Util.BytesToString(data);
return(GetPemHeader(dataStr));
}
catch
{
return("");
}
}
/// <summary>
/// Check if a file is PEM formated.
/// </summary>
/// <param name="fileName">source file name.</param>
/// <returns>true:Yes, false:No.</returns>
public static bool IsPemFormatedFile(string fileName)
{
bool retval = false;
try
{
FileStream fs = new FileStream(fileName, System.IO.FileMode.Open);
byte[] data = new byte[fs.Length];
fs.Read(data, 0, data.Length);
fs.Close();
string dataStr = Asn1Util.BytesToString(data);
retval = IsPemFormated(dataStr);
}
catch
{
retval = false;
}
return(retval);
}
/// <summary>
/// Load PEM formated file.
/// </summary>
/// <param name="fileName">PEM file name.</param>
public void LoadPemData(string fileName)
{
FileStream fs = new FileStream(fileName, FileMode.Open);
byte[] data = new byte[fs.Length];
fs.Read(data, 0, data.Length);
fs.Close();
string dataStr = Asn1Util.BytesToString(data);
if (Asn1Util.IsPemFormated(dataStr))
{
Stream ms = Asn1Util.PemToStream(dataStr);
ms.Position = 0;
LoadData(ms);
}
else
{
throw new Exception("It is a invalid PEM file: " + fileName);
}
}
