Solved

JAI: Reading bad JPEGs

Posted on 2004-09-30
7
1,657 Views
Last Modified: 2012-06-27
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
0
Comment
Question by:Venabili
  • 4
  • 3
7 Comments
 
LVL 86

Accepted Solution

by:
CEHJ earned 500 total points
ID: 12192647
>>(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
 
LVL 20

Author Comment

by:Venabili
ID: 12192867
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
 
LVL 86

Expert Comment

by:CEHJ
ID: 12192933
Can you post a link to the image?
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 20

Author Comment

by:Venabili
ID: 12193005
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
 
LVL 86

Expert Comment

by:CEHJ
ID: 12193147
:-) Make sure it still works when you rename X.gif to X.jpg ;-)
0
 
LVL 20

Author Comment

by:Venabili
ID: 12193217
Seems to be ok :)
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12193263
Well you might just get back a BufferedImage containing a gif without complaint ;-)
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