Examples of javax.imageio.stream.ImageInputStream.mark()

Class javax.imageio.stream.ImageInputStream

Examples of javax.imageio.stream.ImageInputStream.mark()

javax.imageio.stream.ImageInputStream.mark()
Marks a position in the stream to be returned to by a subsequent call to reset. Unlike a standard InputStream, all ImageInputStreams support marking. Additionally, calls to mark and reset may be nested arbitrarily.
Unlike the mark methods declared by the Reader and InputStream interfaces, no readLimit parameter is used. An arbitrary amount of data may be read following the call to mark.
The bit position used by the readBits method is saved and restored by each pair of calls to mark and reset.
Note that it is valid for an ImageReader to call flushBefore as part of a read operation. Therefore, if an application calls mark prior to passing that stream to an ImageReader, the application should not assume that the marked position will remain valid after the read operation has completed.

    }


    @Override
    public boolean canDecodeInput(Object source) throws IOException {
        ImageInputStream iis = (ImageInputStream) source;
        iis.mark();
        try {
            int tag = iis.read()
                   | (iis.read()<<8)
                   | (iis.read()<<16)
                   | (iis.read()<<24);

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                // Perform mark/reset as a defensive measure
                // even though plug-ins are supposed to take
                // care of it.
                boolean canDecode = false;
                if (stream != null) {
                    stream.mark();
                }
                canDecode = spi.canDecodeInput(input);
                if (stream != null) {
                    stream.reset();
                }

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      if (!IMAGEIO_READER_FACTORY.canDecodeInput(inputStream))
        return false;
      reader = IMAGEIO_READER_FACTORY.createReaderInstance();
      


      inputStream.mark();
      reader.setInput(inputStream);
      final IIOMetadata metadata = reader.getImageMetadata(0);
      if(metadata==null)
        return false;
      //

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            if (inputStream == null) {
                if (LOGGER.isLoggable(Level.FINE))
                    LOGGER.fine("Unable to get an ImageInputStream");
                return false;
            }
            inputStream.mark();
            if (!SPI.canDecodeInput(inputStream)) {
                if (LOGGER.isLoggable(Level.FINE))
                    LOGGER.fine("Unable to decode the inputStream");
                return false;
            }

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                stream = inStreamSPI.createInputStreamInstance(source, ImageIO.getUseCache(), ImageIO.getCacheDirectory());
            }
            if (stream == null) {
                    throw new IllegalArgumentException("No input stream for the provided source");
            }
            stream.mark();
            reader = READER_SPI.createReaderInstance();
            reader.setInput(stream);
            final IIOMetadata iioMetadata = reader.getImageMetadata(0);
            metadata = new GeoTiffIIOMetadataDecoder(iioMetadata);
        } catch (IOException e) {

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            LOGGER.severe(message.toString());
          }
          fireEvent(message.toString(),overallProgress);
          break;
        }
        stream.mark();


  
        //
        // get a reader
        //

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          fireEvent(message.toString(),overallProgress);
          break;
        }
        final ImageReader reader = (ImageReader) it.next();
        stream.reset();
        stream.mark();
        // is it a geotiff reader or not?
        if(!reader.getFormatName().toLowerCase().startsWith("tif")){
                                    if (LOGGER.isLoggable(Level.INFO)) {
                                        LOGGER.info("Discarding input file "+files[fileBeingProcessed] + " since it is not a proper tif file.");
                                    }

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        if (LOGGER.isLoggable(Level.FINE))
          LOGGER.fine("Unable to get an ImageInputStream");
        return false;
      }
      // get a reader and check if it is a geotiff
      inputStream.mark();


      // tiff
      if (!readerSpi.canDecodeInput(inputStream)){
        return false;
      }

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                if (LOGGER.isLoggable(Level.FINE))
                    LOGGER.fine("Unable to get an ImageInputStream");
                return false;
            }


            inputStream.mark();


            if (!spi.canDecodeInput(inputStream))
                return false;
            return true;
        } catch (Throwable e) {

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            return false;
        }


        ImageInputStream stream = (ImageInputStream)input;
        byte[] b = new byte[6];
        stream.mark();
        stream.readFully(b);
        stream.reset();


        return b[0] == 'G' && b[1] == 'I' && b[2] == 'F' && b[3] == '8' &&
            (b[4] == '7' || b[4] == '9') && b[5] == 'a';

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