Exemplo n.º 1
0
        public Record(byte[] data, int pointer, bool isQuestion = false)
        {
            var previousePointer = pointer;

            Name  = GetName(data, ref pointer);
            QType = MyBitConverter.ToUInt16(data, ref pointer);
            if (!availableTypes.Contains(QType))
            {
                throw new Exception($"Incorrect type {QType}");
            }
            QClass = MyBitConverter.ToUInt16(data, ref pointer);
            if (isQuestion)
            {
                LengthRecord = pointer - previousePointer;
                Pointer      = pointer;
                return;
            }

            Ttl           = MyBitConverter.ToUInt32(data, ref pointer);
            DataLenght    = MyBitConverter.ToUInt16(data, ref pointer);
            PointerToData = (ushort)pointer;
            Data          = data.Skip(pointer).Take(DataLenght);
            Pointer       = pointer + DataLenght;
            LengthRecord  = Pointer - previousePointer;
        }
Exemplo n.º 2
0
        /// <summary>
        /// Loads TIFF header from stream.
        /// </summary>
        /// <param name="stream">Fully formatted TIFF image.</param>
        /// <returns>Length of header.</returns>
        protected override long Load(Stream stream)
        {
            base.Load(stream);
            byte[] temp = stream.ReadBytes(8);

            if (!CheckIdentifier(temp))
            {
                throw new FormatException("Stream is not a recognised TIFF image.");
            }

            // Change byte order if required.
            if (temp[0] == 'M')
            {
                endianness = MyBitConverter.Endianness.BigEndian;
            }

            // Header
            FirstImageOffset = MyBitConverter.ToUInt32(temp, 4, endianness);
            stream.Seek(FirstImageOffset, SeekOrigin.Begin);
            var IFD = new ImageFileDirectory(stream, endianness);

            Pages = new List <ImageFileDirectory>()
            {
                IFD
            };

            // Add mipmaps if they exist
            while (IFD.NextIFDOffset != 0)
            {
                IFD = new ImageFileDirectory(stream, endianness);
                Pages.Add(IFD);
            }

            return(0); // No sensible return value since header is not contiguous (right?)
        }