Пример #1
0
        public virtual IAsn1Convertible ReadObject()
        {
            int tag = _in.ReadByte();

            if (tag == -1)
            {
                return(null);
            }

            // turn of looking for "00" while we resolve the tag
            Set00Check(false);

            //
            // calculate tag number
            //
            int tagNo = Asn1InputStream.ReadTagNumber(_in, tag);

            bool isConstructed = (tag & Asn1Tags.Constructed) != 0;

            //
            // calculate length
            //
            int length = Asn1InputStream.ReadLength(_in, _limit);

            if (length < 0)             // indefinite length method
            {
                if (!isConstructed)
                {
                    throw new IOException("indefinite length primitive encoding encountered");
                }

                IndefiniteLengthInputStream indIn = new IndefiniteLengthInputStream(_in, _limit);
                Asn1StreamParser            sp    = new Asn1StreamParser(indIn, _limit);

                if ((tag & Asn1Tags.Application) != 0)
                {
                    return(new BerApplicationSpecificParser(tagNo, sp));
                }

                if ((tag & Asn1Tags.Tagged) != 0)
                {
                    return(new BerTaggedObjectParser(true, tagNo, sp));
                }

                return(sp.ReadIndef(tagNo));
            }
            else
            {
                DefiniteLengthInputStream defIn = new DefiniteLengthInputStream(_in, length);

                if ((tag & Asn1Tags.Application) != 0)
                {
                    return(new DerApplicationSpecific(isConstructed, tagNo, defIn.ToArray()));
                }

                if ((tag & Asn1Tags.Tagged) != 0)
                {
                    return(new BerTaggedObjectParser(isConstructed, tagNo, new Asn1StreamParser(defIn)));
                }

                if (isConstructed)
                {
                    // TODO There are other tags that may be constructed (e.g. BitString)
                    switch (tagNo)
                    {
                    case Asn1Tags.OctetString:
                        //
                        // yes, people actually do this...
                        //
                        return(new BerOctetStringParser(new Asn1StreamParser(defIn)));

                    case Asn1Tags.Sequence:
                        return(new DerSequenceParser(new Asn1StreamParser(defIn)));

                    case Asn1Tags.Set:
                        return(new DerSetParser(new Asn1StreamParser(defIn)));

                    case Asn1Tags.External:
                        return(new DerExternalParser(new Asn1StreamParser(defIn)));

                    default:
                        // TODO Add DerUnknownTagParser class?
                        return(new DerUnknownTag(true, tagNo, defIn.ToArray()));
                    }
                }

                // Some primitive encodings can be handled by parsers too...
                switch (tagNo)
                {
                case Asn1Tags.OctetString:
                    return(new DerOctetStringParser(defIn));
                }

                try
                {
                    return(Asn1InputStream.CreatePrimitiveDerObject(tagNo, defIn.ToArray()));
                }
                catch (ArgumentException e)
                {
                    throw new Asn1Exception("corrupted stream detected", e);
                }
            }
        }
Пример #2
0
		public Asn1Object ReadObject()
		{
			int tag = ReadByte();
			if (tag <= 0)
			{
				if (tag == 0)
					throw new IOException("unexpected end-of-contents marker");

				return null;
			}

			//
			// calculate tag number
			//
			int tagNo = ReadTagNumber(this, tag);

			bool isConstructed = (tag & Asn1Tags.Constructed) != 0;

			//
			// calculate length
			//
			int length = ReadLength(this, limit);

			if (length < 0) // indefinite length method
			{
				if (!isConstructed)
					throw new IOException("indefinite length primitive encoding encountered");

				IndefiniteLengthInputStream indIn = new IndefiniteLengthInputStream(this, limit);
            	Asn1StreamParser sp = new Asn1StreamParser(indIn, limit);

				if ((tag & Asn1Tags.Application) != 0)
				{
					return new BerApplicationSpecificParser(tagNo, sp).ToAsn1Object();
				}

				if ((tag & Asn1Tags.Tagged) != 0)
				{
					return new BerTaggedObjectParser(true, tagNo, sp).ToAsn1Object();
				}

				// TODO There are other tags that may be constructed (e.g. BitString)
				switch (tagNo)
				{
					case Asn1Tags.OctetString:
						return new BerOctetStringParser(sp).ToAsn1Object();
					case Asn1Tags.Sequence:
						return new BerSequenceParser(sp).ToAsn1Object();
					case Asn1Tags.Set:
						return new BerSetParser(sp).ToAsn1Object();
					case Asn1Tags.External:
						return new DerExternalParser(sp).ToAsn1Object();
					default:
						throw new IOException("unknown BER object encountered");
				}
			}
			else
			{
				try
				{
					return BuildObject(tag, tagNo, length);
				}
				catch (ArgumentException e)
				{
					throw new Asn1Exception("corrupted stream detected", e);
				}
			}
		}
Пример #3
0
        public Asn1Object ReadObject()
        {
            int tag = ReadByte();

            if (tag <= 0)
            {
                if (tag == 0)
                {
                    throw new IOException("unexpected end-of-contents marker");
                }

                return(null);
            }

            //
            // calculate tag number
            //
            int tagNo = ReadTagNumber(this, tag);

            bool isConstructed = (tag & Asn1Tags.Constructed) != 0;

            //
            // calculate length
            //
            int length = ReadLength(this, limit);

            if (length < 0)             // indefinite length method
            {
                if (!isConstructed)
                {
                    throw new IOException("indefinite length primitive encoding encountered");
                }

                IndefiniteLengthInputStream indIn = new IndefiniteLengthInputStream(this, limit);
                Asn1StreamParser            sp    = new Asn1StreamParser(indIn, limit);

                if ((tag & Asn1Tags.Application) != 0)
                {
                    return(new BerApplicationSpecificParser(tagNo, sp).ToAsn1Object());
                }

                if ((tag & Asn1Tags.Tagged) != 0)
                {
                    return(new BerTaggedObjectParser(true, tagNo, sp).ToAsn1Object());
                }

                // TODO There are other tags that may be constructed (e.g. BitString)
                switch (tagNo)
                {
                case Asn1Tags.OctetString:
                    return(new BerOctetStringParser(sp).ToAsn1Object());

                case Asn1Tags.Sequence:
                    return(new BerSequenceParser(sp).ToAsn1Object());

                case Asn1Tags.Set:
                    return(new BerSetParser(sp).ToAsn1Object());

                case Asn1Tags.External:
                    return(new DerExternalParser(sp).ToAsn1Object());

                default:
                    throw new IOException("unknown BER object encountered");
                }
            }
            else
            {
                try
                {
                    return(BuildObject(tag, tagNo, length));
                }
                catch (ArgumentException e)
                {
                    throw new Asn1Exception("corrupted stream detected", e);
                }
            }
        }
Пример #4
0
		public virtual IAsn1Convertible ReadObject()
		{
			int tag = _in.ReadByte();
			if (tag == -1)
				return null;

			// turn of looking for "00" while we resolve the tag
			Set00Check(false);

			//
			// calculate tag number
			//
			int tagNo = Asn1InputStream.ReadTagNumber(_in, tag);

			bool isConstructed = (tag & Asn1Tags.Constructed) != 0;

			//
			// calculate length
			//
			int length = Asn1InputStream.ReadLength(_in, _limit);

			if (length < 0) // indefinite length method
			{
				if (!isConstructed)
					throw new IOException("indefinite length primitive encoding encountered");

				IndefiniteLengthInputStream indIn = new IndefiniteLengthInputStream(_in, _limit);
				Asn1StreamParser sp = new Asn1StreamParser(indIn, _limit);

				if ((tag & Asn1Tags.Application) != 0)
				{
					return new BerApplicationSpecificParser(tagNo, sp);
				}

				if ((tag & Asn1Tags.Tagged) != 0)
				{
					return new BerTaggedObjectParser(true, tagNo, sp);
				}

				return sp.ReadIndef(tagNo);
			}
			else
			{
				DefiniteLengthInputStream defIn = new DefiniteLengthInputStream(_in, length);

				if ((tag & Asn1Tags.Application) != 0)
				{
					return new DerApplicationSpecific(isConstructed, tagNo, defIn.ToArray());
				}

				if ((tag & Asn1Tags.Tagged) != 0)
				{
					return new BerTaggedObjectParser(isConstructed, tagNo, new Asn1StreamParser(defIn));
				}

				if (isConstructed)
				{
					// TODO There are other tags that may be constructed (e.g. BitString)
					switch (tagNo)
					{
						case Asn1Tags.OctetString:
							//
							// yes, people actually do this...
							//
							return new BerOctetStringParser(new Asn1StreamParser(defIn));
						case Asn1Tags.Sequence:
							return new DerSequenceParser(new Asn1StreamParser(defIn));
						case Asn1Tags.Set:
							return new DerSetParser(new Asn1StreamParser(defIn));
						case Asn1Tags.External:
							return new DerExternalParser(new Asn1StreamParser(defIn));
						default:
							// TODO Add DerUnknownTagParser class?
							return new DerUnknownTag(true, tagNo, defIn.ToArray());
					}
				}

				// Some primitive encodings can be handled by parsers too...
				switch (tagNo)
				{
					case Asn1Tags.OctetString:
						return new DerOctetStringParser(defIn);
				}

				try
				{
					return Asn1InputStream.CreatePrimitiveDerObject(tagNo, defIn.ToArray());
				}
				catch (ArgumentException e)
				{
					throw new Asn1Exception("corrupted stream detected", e);
				}
			}
		}