asked on

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

ASKER CERTIFIED SOLUTION

CEHJ

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Venabili

ASKER

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

CEHJ

Can you post a link to the image?

Venabili

ASKER

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 :)

CEHJ

:-) Make sure it still works when you rename X.gif to X.jpg ;-)

Venabili

ASKER

Seems to be ok :)

CEHJ

Well you might just get back a BufferedImage containing a gif without complaint ;-)