CSJ2K.j2k.image.input.ImgReaderPGX.ImgReaderPGX C# (CSharp) Метод

        public ImgReaderPGX(System.IO.Stream in_Renamed)
        {
            System.String header;

            //Opens the given file
            this.in_Renamed = in_Renamed;
            try
            {
                System.IO.StreamReader in_reader = new System.IO.StreamReader(this.in_Renamed);
                //UPGRADE_ISSUE: Method 'java.io.RandomAccessFile.readLine' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javaioRandomAccessFilereadLine'"
                header = in_reader.ReadLine();
            }
            catch (System.IO.IOException e)
            {
                throw new System.IO.IOException("Not a PGX file");
            }
            if (header == null)
            {
                throw new System.IO.IOException("Empty file");
            }
            offset = (header.Length + 1);

            //Get informations from header
            SupportClass.Tokenizer st = new SupportClass.Tokenizer(header);
            try
            {
                int nTokens = st.Count;

                // Magic Number
                if (!(st.NextToken()).Equals("PG"))
                    throw new System.IO.IOException("Not a PGX file");

                // Endianess
                System.String tmp = st.NextToken();
                if (tmp.Equals("LM"))
                    byteOrder = CSJ2K.j2k.io.EndianType_Fields.LITTLE_ENDIAN;
                else if (tmp.Equals("ML"))
                    byteOrder = CSJ2K.j2k.io.EndianType_Fields.BIG_ENDIAN;
                else
                    throw new System.IO.IOException("Not a PGX file");

                // Unsigned/signed if present in the header
                if (nTokens == 6)
                {
                    tmp = st.NextToken();
                    if (tmp.Equals("+"))
                        isSigned = false;
                    else if (tmp.Equals("-"))
                        isSigned = true;
                    else
                        throw new System.IO.IOException("Not a PGX file");
                }

                // bit-depth, width, height
                try
                {
                    bitDepth = (System.Int32.Parse(st.NextToken()));
                    // bitDepth must be between 1 and 31
                    if ((bitDepth <= 0) || (bitDepth > 31))
                        throw new System.IO.IOException("Not a PGX file");

                    w = (System.Int32.Parse(st.NextToken()));
                    h = (System.Int32.Parse(st.NextToken()));
                }
                catch (System.FormatException e)
                {
                    throw new System.IO.IOException("Not a PGX file");
                }
            }
            catch (System.ArgumentOutOfRangeException e)
            {
                throw new System.IO.IOException("Not a PGX file");
            }

            // Number of component
            nc = 1;

            // Number of bytes per data
            if (bitDepth <= 8)
                packBytes = 1;
            else if (bitDepth <= 16)
                packBytes = 2;
            // <= 31
            else
                packBytes = 4;
        }