Exemplo n.º 1
0
        /**
         * Reads the header information from the passed in stream and returns it. It also returns
         * a BinaryReader that is endian-appropriate for the data stream.
         *
         * @param	ParserStream		source stream of data to read from
         * @param	BinaryStream [out]	binary reader used for reading from stream
         * @return	serialized header
         */
        public static StreamHeader ReadHeader(Stream ParserStream, out BinaryReader BinaryStream)
        {
            // Create a binary stream for data, we might toss this later for are an endian swapping one.
            BinaryStream = new BinaryReader(ParserStream, System.Text.Encoding.ASCII);

            // Serialize header.
            StreamHeader Header = new StreamHeader(BinaryStream);

            // Determine whether read file has magic header. If no, try again byteswapped.
            if (Header.Magic != StreamHeader.ExpectedMagic)
            {
                // Seek back to beginning of stream before we retry.
                ParserStream.Seek(0, SeekOrigin.Begin);

                // Use big endian reader. It transparently endian swaps data on read.
                BinaryStream = new BinaryReaderBigEndian(ParserStream);

                // Serialize header a second time.
                Header = new StreamHeader(BinaryStream);
            }

            // At this point we should have a valid header. If no, throw an exception.
            if (Header.Magic != StreamHeader.ExpectedMagic)
            {
                ShowDialog("Error", "Unrecognized file");
                throw new InvalidDataException();
            }

            if (Header.Version != StreamHeader.ExpectedVersion)
            {
                ShowDialog("Error", "Invalid version");
                throw new InvalidDataException();
            }

            return(Header);
        }
Exemplo n.º 2
0
		/**
		 * Reads the header information from the passed in stream and returns it. It also returns
		 * a BinaryReader that is endian-appropriate for the data stream. 
		 *
		 * @param	ParserStream		source stream of data to read from
		 * @param	BinaryStream [out]	binary reader used for reading from stream
		 * @return	serialized header
		 */
		public static StreamHeader ReadHeader( Stream ParserStream, out BinaryReader BinaryStream  )
		{
			// Create a binary stream for data, we might toss this later for are an endian swapping one.
			BinaryStream = new BinaryReader(ParserStream,System.Text.Encoding.ASCII);

			// Serialize header.
			StreamHeader Header = new StreamHeader(BinaryStream);

			// Determine whether read file has magic header. If no, try again byteswapped.
			if(Header.Magic != StreamHeader.ExpectedMagic)
			{
				// Seek back to beginning of stream before we retry.
				ParserStream.Seek(0,SeekOrigin.Begin);

				// Use big endian reader. It transparently endian swaps data on read.
				BinaryStream = new BinaryReaderBigEndian(ParserStream);
				
				// Serialize header a second time.
				Header = new StreamHeader(BinaryStream);
			}

			// At this point we should have a valid header. If no, throw an exception.
			if( Header.Magic != StreamHeader.ExpectedMagic )
			{
				ShowDialog( "Error", "Unrecognized file" );
				throw new InvalidDataException();
			}

			if ( Header.Version != StreamHeader.ExpectedVersion )
			{
				ShowDialog( "Error", "Invalid version" );
				throw new InvalidDataException();
			}

			return Header;
		}