SobekCM.Resource_Object.Divisions.SobekCM_File_Info.get_attributes_from_jpeg2000 C# (CSharp) Method

        private bool get_attributes_from_jpeg2000(string File)
        {
            try
            {
                // Get the height and width of this JPEG file
                FileStream reader = new FileStream(File, FileMode.Open, FileAccess.Read);
                int[] previousValues = {0, 0, 0, 0};
                int bytevalue = reader.ReadByte();
                int count = 1;
                while (bytevalue != -1)
                {
                    // Move this value into the array
                    previousValues[0] = previousValues[1];
                    previousValues[1] = previousValues[2];
                    previousValues[2] = previousValues[3];
                    previousValues[3] = bytevalue;

                    // Is this IHDR?
                    if ((previousValues[0] == 105) && (previousValues[1] == 104) &&
                        (previousValues[2] == 100) && (previousValues[3] == 114))
                    {
                        break;
                    }

                    // Is this the first four bytes and does it match the output from Kakadu 3-2?
                    if ((count == 4) && (previousValues[0] == 255) && (previousValues[1] == 79) &&
                        (previousValues[2] == 255) && (previousValues[3] == 81))
                    {
                        reader.ReadByte();
                        reader.ReadByte();
                        reader.ReadByte();
                        reader.ReadByte();
                        break;
                    }

                    // Read the next byte
                    bytevalue = reader.ReadByte();
                    count++;
                }

                // Now, read ahead for the height and width
                Height = (ushort) ((((((reader.ReadByte()*256) + reader.ReadByte())*256) + reader.ReadByte())*256) + reader.ReadByte());
                Width = (ushort) ((((((reader.ReadByte()*256) + reader.ReadByte())*256) + reader.ReadByte())*256) + reader.ReadByte());
                reader.Close();

                return true;
            }
            catch
            {
                return false;
            }
        }