// File Menu
public void OnFileNew (object sender, EventArgs args)
{
currentfile = null;
savename = null;
asn = null;
pp = null;
appbar1.Default = String.Empty;
UpdateDisplay ();
findfwd = textview1.Buffer.StartIter;
findbck = textview1.Buffer.EndIter;
findstart = -1;
findend = -1;
OnFindEntryChange (sender, args);
}
// 0x1D CHARACTER STRING
private void PrintCharacterString (StringBuilder sb, int level, ASN1Element asn)
{
PrintToDo ("CHARACTER STRING", sb, level, asn);
}
// Print non universal data (application, context, private)
private void PrintOtherData (StringBuilder sb, int level, ASN1Element asn)
{
byte tag = asn.Tag;
if (tag < 0x40 && !asn.IsConstructed) {
PrintToDo ("UNKNOWN", sb, level, asn);
return;
}
string type = null;
if (tag >= 0xC0) {
tag -= 0xC0;
type = "PRIVATE";
}
if (tag >= 0x80) {
tag -= 0x80;
type = "CONTEXT";
}
if (tag >= 0x40) {
tag -= 0x40;
type = "APPLICATION";
}
byte[] value = asn.Value;
sb.Append ("[");
if (_options.ShowTagClass)
sb.AppendFormat ("{0} ", type);
if (asn.IsConstructed) {
sb.AppendFormat ("{0}] {1}", (tag - 0x20), "{");
// constructed data is automatically printed elsewhere
} else {
sb.AppendFormat ("{0}]", tag);
PrintData (sb, level, value, 0, value.Length);
}
}
// 0x16 IA5 STRING
private void PrintIA5String (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("IA5String"); // ASCII
PrintString (sb, level, Encoding.ASCII.GetString (asn.Value));
}
// 0x1A VISIBLE STRING
private void PrintVisibleString (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("VisibleString"); // ASCII subset
PrintString (sb, level, Encoding.ASCII.GetString (asn.Value));
}
// 0x0B EMBEDDED PDV (PRESENTATION DATA VALUE)
private void PrintEmbeddedPDV (StringBuilder sb, int level, ASN1Element asn)
{
PrintToDo ("EMBEDDED PDV", sb, level, asn);
}
// 0x0D RELATIVE-OID
private void PrintRelativeOid (StringBuilder sb, int level, ASN1Element asn)
{
PrintToDo ("RELATIVE-OID", sb, level, asn);
}
private void PrintToDo (string s, StringBuilder sb, int level, ASN1Element asn)
{
sb.AppendFormat ("{0} (TODO)", s);
byte[] value = asn.Value;
PrintData (sb, level, value, 0, value.Length);
}
// 0x01 BOOLEAN
private void PrintBoolean (StringBuilder sb, int level, ASN1Element asn)
{
byte[] value = asn.Value;
sb.AppendFormat ("BOOLEAN {0}", (value [0] == 1) ? "FALSE" : "TRUE");
}
private void GetTagName (StringBuilder sb, int level, ASN1Element asn)
{
switch (asn.Tag) {
case 0x01:
PrintBoolean (sb, level, asn);
break;
case 0x02:
PrintInteger (sb, level, asn);
break;
case 0x03:
PrintBitString (sb, level, asn);
break;
case 0x04:
PrintOctetString (sb, level, asn);
break;
case 0x05:
PrintNull (sb, level, asn);
break;
case 0x06:
PrintOID (sb, level, asn);
break;
case 0x07:
PrintObjectDescriptor (sb, level, asn);
break;
case 0x08:
PrintExternal (sb, level, asn);
break;
case 0x09:
PrintReal (sb, level, asn);
break;
case 0x0A:
PrintEnumerated (sb, level, asn);
break;
case 0x0B:
PrintEmbeddedPDV (sb, level, asn);
break;
case 0x0C:
PrintUtf8String (sb, level, asn);
break;
case 0x0D:
PrintRelativeOid (sb, level, asn);
break;
// 0x0E RFU
// 0x0F RFU
case 0x10:
sb.Append ("SEQUENCE"); // non-constructed version
break;
case 0x11:
sb.Append ("SET"); // non-constructed version
break;
case 0x12:
PrintNumericString (sb, level, asn);
break;
case 0x13:
PrintPrintableString (sb, level, asn);
break;
case 0x14:
PrintT61String (sb, level, asn);
break;
case 0x15:
PrintVideotexString (sb, level, asn);
break;
case 0x16:
PrintIA5String (sb, level, asn);
break;
case 0x17:
PrintUtcTime (sb, level, asn);
break;
case 0x18:
PrintGeneralizedTime (sb, level, asn);
break;
case 0x19:
PrintGraphicString (sb, level, asn);
break;
case 0x1A:
PrintVisibleString (sb, level, asn);
break;
case 0x1B:
PrintGeneralString (sb, level, asn);
break;
case 0x1C:
PrintUniversalString (sb, level, asn);
break;
case 0x1D:
PrintCharacterString (sb, level, asn);
break;
case 0x1E:
PrintBMPString (sb, level, asn);
break;
case 0x30:
sb.Append ("SEQUENCE {");
break;
case 0x31:
sb.Append ("SET {");
break;
default:
PrintOtherData (sb, level, asn);
break;
}
}
private void PrintEncapsulated (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append (", encapsulates {");
sb.Append (Environment.NewLine);
PrintElement (sb, level + 1, asn);
Header (sb, null);
Indent (sb, level);
sb.Append ("}");
}
private void PrintElement (StringBuilder sb, int level, ASN1Element asn)
{
// used in undefined length encoding
if (asn.Tag == 0x00)
return;
Header (sb, asn);
Indent (sb, level);
GetTagName (sb, level, asn);
if (asn.Count > 0) {
sb.Append (Environment.NewLine);
for (int i = 0; i < asn.Count; i++)
PrintElement (sb, level + 1, asn [i]);
}
if (asn.IsConstructed) {
if (asn.Count > 0) {
Header (sb, null);
Indent (sb, level);
}
sb.Append ("}");
}
sb.Append (Environment.NewLine);
}
// TODO > 9999 (dec) or FFFF (hex)
private void Header (StringBuilder sb, ASN1Element asn)
{
if (asn == null) {
if (_options.IsHeader ()) {
if (_options.ViewPosition)
sb.Append (" ");
if (_options.ViewTag)
sb.Append (" ");
if (_options.ViewLength)
sb.Append (" ");
sb.Append (": ");
}
} else {
// _prefix is used for encapsulated data
if (_options.ViewPosition)
sb.AppendFormat ("{0} ", (_prefix + asn.Position).ToString ("D4"));
if (_options.ViewTag)
sb.AppendFormat ("{0} ", asn.Tag.ToString ("X2"));
if (_options.ViewLength)
sb.AppendFormat ("{0} ", (asn.IsUndefinedLength) ? "NDEF" : asn.Length.ToString ("D4"));
if (_options.IsHeader ())
sb.Append (": ");
}
}
public PrettyPrinter (ASN1Element asn)
{
_asn = asn;
_options.Copy (_defaults);
}
// 0x09 REAL
private void PrintReal (StringBuilder sb, int level, ASN1Element asn)
{
PrintToDo ("REAL", sb, level, asn);
}
// 0x02 INTEGER
private void PrintInteger (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("INTEGER ");
byte[] value = asn.Value;
// case 1 - it fits into a ulong (8 bytes)
if (value.Length <= 8) {
ulong integer = 0;
for (int i=0; i < value.Length; i++)
integer = (integer << 8) + value [i];
sb.Append (integer);
} else {
// TODO: Use BigInteger class to display the beast
PrintBinaryData (sb, level, value, 0, value.Length);
}
}
// 0x0A ENUMERATED
private void PrintEnumerated (StringBuilder sb, int level, ASN1Element asn)
{
PrintToDo ("ENUMERATED", sb, level, asn);
}
// 0x03 BIT STRING
private void PrintBitString (StringBuilder sb, int level, ASN1Element asn)
{
byte[] value = asn.Value;
bool printed = false;
sb.AppendFormat ("BIT STRING ({0} unused bits)", value [0]);
if (_options.IncludeEncapsulated) {
try {
ASN1Element enc = new ASN1Element (value, 1);
if ((enc.Tag <= 0x31) && (enc.Length < asn.Length)) {
_prefix = asn.ValuePosition;
PrintEncapsulated (sb, level, enc);
printed = true;
}
}
catch {
// it may not be ASN.1 !
}
finally {
_prefix = 0;
}
}
if (!printed) {
// special case for small data (e.g. bitmask)
if (value.Length == 2) {
sb.Append (Environment.NewLine);
Header (sb, null);
Indent (sb, level + 1);
byte b = value [1];
// skip the unused bits
for (int i = 0; i < value [0]; i++)
b >>= 1;
// and show the remaining bits
sb.Append ("'");
for (int i = value [0]; i < 8; i++) {
sb.Append (((b & 1) == 1) ? "1" : "0");
b >>= 1;
}
sb.Append ("'B");
} else {
PrintData (sb, level, value, 1, value.Length - 1);
}
}
}
// 0x0C UTF8 STRING
private void PrintUtf8String (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("UTF8String");
PrintString (sb, level, Encoding.UTF8.GetString (asn.Value));
}
// 0x04 OCTET STRING
private void PrintOctetString (StringBuilder sb, int level, ASN1Element asn)
{
byte[] value = asn.Value;
bool printed = false;
sb.Append ("OCTET STRING");
if (_options.IncludeEncapsulated) {
try {
ASN1Element enc = new ASN1Element (value, 0);
if ((enc.Tag <= 0x31) && (enc.Length < asn.Length)) {
_prefix = asn.ValuePosition;
PrintEncapsulated (sb, level, enc);
printed = true;
}
}
catch {
// it may not be ASN.1 !
}
finally {
_prefix = 0;
}
}
if (!printed) {
PrintData (sb, level, value, 0, value.Length);
}
}
// 0x12 NUMERIC STRING
private void PrintNumericString (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("NumericString");
// FIXME: should contain only ' ' and '0' to '9'
PrintString (sb, level, Encoding.ASCII.GetString (asn.Value));
}
// 0x05 NULL
private void PrintNull (StringBuilder sb, int level, ASN1Element asn)
{
// FIXME: report errors if length != 0 (in ASNElement ?)
sb.Append ("NULL");
}
// 0x18 GENERALIZED TIME
private void PrintGeneralizedTime (StringBuilder sb, int level, ASN1Element asn)
{
sb.AppendFormat ("GeneralizedTime '{0}'", Encoding.ASCII.GetString (asn.Value));
// TODO: option to show as local time ?
}
// 0x06 OBJECT IDENTIFIER
private void PrintOID (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("OBJECT IDENTIFIER ");
string oid = DecodeOid (asn.Value);
string name = ResolveOid (oid);
if (name.Length > 0)
sb.AppendFormat ("{0} ", name);
switch (_options.OidFormat) {
case OidFormat.ITU:
sb.AppendFormat ("({0})", oid.Replace ('.', ' '));
break; // 0x0C UTF8 STRING
case OidFormat.URN:
sb.AppendFormat ("(urn:oid:{0})", oid);
break;
default:
sb.AppendFormat ("({0})", oid);
break;
}
}
// 0x1C UNIVERSAL STRING
private void PrintUniversalString (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("UniversalString");
PrintString (sb, level, Encoding.ASCII.GetString (asn.Value));
}
// 0x07 OBJECT DESCRIPTOR
private void PrintObjectDescriptor (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("ObjectDescriptor");
PrintString (sb, level, Encoding.ASCII.GetString (asn.Value));
}
// 0x1E BMP STRING
private void PrintBMPString (StringBuilder sb, int level, ASN1Element asn)
{
sb.Append ("BMPString"); // Unicode
PrintString (sb, level, Encoding.BigEndianUnicode.GetString (asn.Value));
}
// 0x08 EXTERNAL
private void PrintExternal (StringBuilder sb, int level, ASN1Element asn)
{
PrintToDo ("EXTERNAL", sb, level, asn);
}
private void DecodeChilds ()
{
_childs = new ArrayList ();
int childpos = _valuePosition;
int end = childpos + _valueLength;
while ((_valueLength == -1) || (childpos < end)) {
ASN1Element el = new ASN1Element (_data, childpos);
_childs.Add (el);
childpos += el.TotalLength;
// exit condition for undefined length (_valueLength == -1)
if ((el.Tag == 0x00) && (el.Length == 0))
break;
}
}
private void FileLoad (string filename)
{
try {
byte[] buffer = Load (filename);
appbar1.ProgressPercentage = 0.25f;
asn = Decode (buffer);
appbar1.ProgressPercentage = 0.75f;
UpdateDisplay ();
appbar1.ProgressPercentage = 1.0f;
currentfile = Path.GetFullPath (filename);
appbar1.Default = currentfile;
findfwd = textview1.Buffer.StartIter;
findbck = textview1.Buffer.EndIter;
}
catch (Exception e) {
currentfile = null;
asn = null;
textview1.Buffer.Text = e.ToString ();
appbar1.Default = "Error loading file " + filename;
Console.Error.WriteLine (e);
}
}
