/// <summary>
/// Decode an LBER encoded value into an Asn1Object from an InputStream.
/// This method also returns the total length of this encoded
/// Asn1Object (length of type + length of length + length of content)
/// in the parameter len. This information is helpful when decoding
/// structured types.
/// </summary>
public Asn1Object Decode(Stream inRenamed, int[] len)
{
_asn1Id.Reset(inRenamed);
_asn1Len.Reset(inRenamed);
var length = _asn1Len.Length;
len[0] = _asn1Id.EncodedLength + _asn1Len.EncodedLength + length;
if (_asn1Id.IsUniversal)
{
switch (_asn1Id.Tag)
{
case Asn1Sequence.Tag:
return(new Asn1Sequence(this, inRenamed, length));
case Asn1Set.Tag:
return(new Asn1Set(this, inRenamed, length));
case Asn1Boolean.Tag:
return(new Asn1Boolean(this, inRenamed, length));
case Asn1Integer.Tag:
return(new Asn1Integer(this, inRenamed, length));
case Asn1OctetString.Tag:
return(new Asn1OctetString(this, inRenamed, length));
case Asn1Enumerated.Tag:
return(new Asn1Enumerated(this, inRenamed, length));
case Asn1Null.Tag:
return(new Asn1Null()); // has no content to decode.
/* Asn1 TYPE NOT YET SUPPORTED
* case Asn1BitString.TAG:
* return new Asn1BitString(this, in, length);
* case Asn1ObjectIdentifier.TAG:
* return new Asn1ObjectIdentifier(this, in, length);
* case Asn1Real.TAG:
* return new Asn1Real(this, in, length);
* case Asn1NumericString.TAG:
* return new Asn1NumericString(this, in, length);
* case Asn1PrintableString.TAG:
* return new Asn1PrintableString(this, in, length);
* case Asn1TeletexString.TAG:
* return new Asn1TeletexString(this, in, length);
* case Asn1VideotexString.TAG:
* return new Asn1VideotexString(this, in, length);
* case Asn1IA5String.TAG:
* return new Asn1IA5String(this, in, length);
* case Asn1GraphicString.TAG:
* return new Asn1GraphicString(this, in, length);
* case Asn1VisibleString.TAG:
* return new Asn1VisibleString(this, in, length);
* case Asn1GeneralString.TAG:
* return new Asn1GeneralString(this, in, length);
*/
default:
throw new EndOfStreamException("Unknown tag"); // !!! need a better exception
}
}
// APPLICATION or CONTEXT-SPECIFIC tag
return(new Asn1Tagged(this, inRenamed, length, (Asn1Identifier)_asn1Id.Clone()));
}
/// <summary>
/// Decode an LBER encoded value into an Asn1Object from an InputStream.
/// This method also returns the total length of this encoded
/// Asn1Object (length of type + length of length + length of content)
/// in the parameter len. This information is helpful when decoding
/// structured types.
/// </summary>
public async ValueTask <Asn1Object> Decode(Stream inRenamed, int[] len, CancellationToken cancellationToken)
{
_asn1Id.Reset(inRenamed);
_asn1Len.Reset(inRenamed);
var length = _asn1Len.Length;
len[0] = _asn1Id.EncodedLength + _asn1Len.EncodedLength + length;
if (_asn1Id.IsUniversal)
{
switch (_asn1Id.Tag)
{
case Asn1Sequence.Tag:
return(new Asn1Sequence(await Asn1Structured.DecodeStructured(this, inRenamed, length, cancellationToken).ConfigureAwait(false)));
case Asn1Set.Tag:
return(new Asn1Set(await Asn1Structured.DecodeStructured(this, inRenamed, length, cancellationToken).ConfigureAwait(false)));
case Asn1Boolean.Tag:
return(new Asn1Boolean(await DecodeBoolean(inRenamed, length, cancellationToken).ConfigureAwait(false)));
case Asn1Integer.Tag:
return(new Asn1Integer(await DecodeNumeric(inRenamed, length, cancellationToken).ConfigureAwait(false)));
case Asn1OctetString.Tag:
return(new Asn1OctetString(length > 0 ? await DecodeOctetString(inRenamed, length, cancellationToken).ConfigureAwait(false) : new byte[0]));
case Asn1Enumerated.Tag:
return(new Asn1Enumerated(await DecodeNumeric(inRenamed, length, cancellationToken).ConfigureAwait(false)));
case Asn1Null.Tag:
return(new Asn1Null()); // has no content to decode.
/* Asn1 TYPE NOT YET SUPPORTED
* case Asn1BitString.TAG:
* return new Asn1BitString(this, in, length);
* case Asn1ObjectIdentifier.TAG:
* return new Asn1ObjectIdentifier(this, in, length);
* case Asn1Real.TAG:
* return new Asn1Real(this, in, length);
* case Asn1NumericString.TAG:
* return new Asn1NumericString(this, in, length);
* case Asn1PrintableString.TAG:
* return new Asn1PrintableString(this, in, length);
* case Asn1TeletexString.TAG:
* return new Asn1TeletexString(this, in, length);
* case Asn1VideotexString.TAG:
* return new Asn1VideotexString(this, in, length);
* case Asn1IA5String.TAG:
* return new Asn1IA5String(this, in, length);
* case Asn1GraphicString.TAG:
* return new Asn1GraphicString(this, in, length);
* case Asn1VisibleString.TAG:
* return new Asn1VisibleString(this, in, length);
* case Asn1GeneralString.TAG:
* return new Asn1GeneralString(this, in, length);
*/
default:
throw new EndOfStreamException("Unknown tag"); // !!! need a better exception
}
}
// APPLICATION or CONTEXT-SPECIFIC tag
return(new Asn1Tagged((Asn1Identifier)_asn1Id.Clone(), new Asn1OctetString(length > 0 ? await DecodeOctetString(inRenamed, length, cancellationToken).ConfigureAwait(false) : new byte[0])));
}