JAI: Reading bad JPEGs

Here is the code I use:
    public int getImage(String fileName) {
        try{
            if (!fileName.toUpperCase().endsWith(".JPG") && !fileName.toUpperCase().endsWith(".JPEG")){
                return 0;
            }
          RenderedOp image = JAI.create("fileload", fileName);
            try{
                System.out.println(image.getParameters());
                System.out.println(image.getBounds());
            }catch (Exception e){
                return 0;
            }
            return 1;
        }catch (Exception e){
            e.printStackTrace();
            return 0;
        }
    }

All is fine, the create operation is ok. But when reading bad JPEGs (0 bytes ones or things that are not JPEGS at all) , the invoking of the methods on the image object is throwing an Exception (getParameters() seems to be the only one working)
All the others throw:
Error: IOException occurs when search for propriate codecs.

Occurs in: com.sun.media.jai.codec.ImageCodec

java.io.EOFException
      at com.sun.media.jai.codec.SeekableStream.readFully(SeekableStream.java:329)
      at com.sun.media.jai.codec.SeekableStream.readFully(SeekableStream.java:306)
      at com.sun.media.jai.codec.ImageCodec.getDecoderNames(ImageCodec.java:274)
      at com.sun.media.jai.opimage.StreamRIF.create(StreamRIF.java:80)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at javax.media.jai.FactoryCache.invoke(FactoryCache.java:130)
      at javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1682)
      at javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperationRegistry.java:481)
      at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:340)
      at com.sun.media.jai.opimage.FileLoadRIF.create(FileLoadRIF.java:122)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at javax.media.jai.FactoryCache.invoke(FactoryCache.java:130)
      at javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1682)
      at javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperationRegistry.java:481)
      at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:340)
      at javax.media.jai.RenderedOp.createInstance(RenderedOp.java:830)
      at javax.media.jai.RenderedOp.createRendering(RenderedOp.java:878)
      at javax.media.jai.RenderedOp.getColorModel(RenderedOp.java:2253)
      at myclass.getImage(ReadCMYKJPG.java:131)
      at myclass.main(ReadCMYKJPG.java:151)
And this happens a few times in a row.

Line 131 is                
System.out.println(image.getBounds());

Any idea how to check the RenderedOp so that I do not call the methids if it is not ok?

Thanks in advance
Venabili
LVL 20
VenabiliAsked:
Who is Participating?
 
CEHJConnect With a Mentor Commented:
>>(0 bytes ones or things that are not JPEGS at all)

Try this:

      public static boolean isJPEG(File jpgFile) {
            long length = jpgFile.length();
            if (length < 1) {
                  return false;
            }
            FileInputStream in = null;
            final int HEAD_LENGTH = 10;
            byte[] header = new byte[HEAD_LENGTH];
            try {
                  in = new FileInputStream(jpgFile);
                  in.read(header);
                  return "JFIF".equals(new String(header, 6, 4));
            }
            catch (IOException e) {
                  e.printStackTrace();
                  return false;
            }
            finally {
                  try {
                        if (in != null) {
                              in.close();
                        }
                  }
                  catch(IOException e) {
                        /* ignore */
                  }
            }
      }
0
 
VenabiliAuthor Commented:
It does not recognise a valid CMYK JPEG.
The part for the empty file is ok but the second part does not recognise the JPEG :)

Venabili
0
 
CEHJCommented:
Can you post a link to the image?
0
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VenabiliAuthor Commented:
It's a little copyrighted and just now I have no software to produce another:(
But I think I solved it - once I handle correctly the 0 bytes ones, the JAI takes care for the others :)
So this works:

    public static boolean isJPEG(File jpgFile) {
        long length = jpgFile.length();
        if (length < 1) {
            return false;
        }
        return true;
    }
    public static BufferedImage getImage(String fileName) {
        try{
            if (!fileName.toUpperCase().endsWith(".JPG") && !fileName.toUpperCase().endsWith(".JPEG")){
                return null;
            }
            RenderedOp image = JAI.create("fileload", fileName);
            BufferedImage result = null;
            try {
                if (isJPEG(new File(fileName))) {
                    if (image.getColorModel().getNumComponents() == 4) {
                        result = convertCMYKtoRGB(image);
                    }
                } else {
                    return null;
                }
            } catch (Exception e) {
                return null;
            }
            return result;
        }catch (Exception e){
            return null;
        }
    }

I need sleep :( and you just earned easy points:) Thanks for the help :)
0
 
CEHJCommented:
:-) Make sure it still works when you rename X.gif to X.jpg ;-)
0
 
VenabiliAuthor Commented:
Seems to be ok :)
0
 
CEHJCommented:
Well you might just get back a BufferedImage containing a gif without complaint ;-)
0
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