decode() публичный абстрактный Метод

Decodes the ASN.1 buffer and sets the values in the AsnType object.
public abstract decode ( byte buffer, int offset ) : int
buffer byte The encoded data buffer
offset int The offset of the first valid byte.
Результат int
Пример #1
1
        /// <summary>Decode BER encoded variable binding.
        /// </summary>
        /// <param name="buffer">BER encoded buffer
        /// </param>
        /// <param name="offset">Offset in the data buffer from where to start decoding. Offset is
        /// passed by reference and will contain the offset of the byte immediately after the parsed
        /// variable binding.
        /// </param>
        /// <returns>Buffer position after the decoded value</returns>
        public override int decode(byte[] buffer, int offset)
        {
            int headerLength;
            byte asnType = ParseHeader(buffer, ref offset, out headerLength);

            if (asnType != Type)
                throw new SnmpException(string.Format("Invalid ASN.1 type. Expected 0x{0:x2} received 0x{1:x2}", Type, asnType));

            // verify the length
            if ((buffer.Length - offset) < headerLength)
                throw new OverflowException("Buffer underflow error");

            _oid = new Oid();
            offset = _oid.decode(buffer, offset);
            int saveOffset = offset;
            // Look ahead in the header to see the data type we need to parse
            asnType = ParseHeader(buffer, ref saveOffset, out headerLength);
            _value = SnmpConstants.GetSyntaxObject(asnType);
            if (_value == null)
                throw new SnmpDecodingException(String.Format("Invalid ASN.1 type encountered 0x{0:x2}. Unable to continue decoding.", asnType));
            offset = _value.decode(buffer, offset);
            return offset;
        }
Пример #2
0
        /// <summary>Decode BER encoded variable binding.
        /// </summary>
        /// <param name="buffer">BER encoded buffer
        /// </param>
        /// <param name="offset">Offset in the data buffer from where to start decoding. Offset is
        /// passed by reference and will contain the offset of the byte immediately after the parsed
        /// variable binding.
        /// </param>
        /// <returns>Buffer position after the decoded value</returns>
        public override int decode(byte[] buffer, int offset)
        {
            int  headerLength;
            byte asnType = ParseHeader(buffer, ref offset, out headerLength);

            if (asnType != Type)
            {
                throw new SnmpException(string.Format("Invalid ASN.1 type. Expected 0x{0:x2} received 0x{1:x2}", Type, asnType));
            }

            // verify the length
            if ((buffer.Length - offset) < headerLength)
            {
                throw new OverflowException("Buffer underflow error");
            }

            _oid   = new Oid();
            offset = _oid.decode(buffer, offset);
            int saveOffset = offset;

            // Look ahead in the header to see the data type we need to parse
            asnType = ParseHeader(buffer, ref saveOffset, out headerLength);
            _value  = SnmpConstants.GetSyntaxObject(asnType);
            if (_value == null)
            {
                throw new SnmpDecodingException(String.Format("Invalid ASN.1 type encountered 0x{0:x2}. Unable to continue decoding.", asnType));
            }
            offset = _value.decode(buffer, offset);
            return(offset);
        }