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https://issues.apache.org/jira/browse/IMAGING-134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14332359#comment-14332359
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Michael Groß edited comment on IMAGING-134 at 2/22/15 8:54 PM:
---------------------------------------------------------------
The exception is thrown from
*org.apache.commons.imaging.formats.jpeg.decoder.JpegInputStream.nextBit()*
when a marker called *b2* is not 220:
{noformat}
org.apache.commons.imaging.formats.jpeg.JpegConstants
public static final int DNL_MARKER = 0xFFdc;
org.apache.commons.imaging.formats.jpeg.decoder.JpegInputStream.nextBit()
if (b2 == (0xff & JpegConstants.DNL_MARKER)) {
throw new ImageReadException("DNL not yet supported");
}
throw new ImageReadException("Invalid marker found " + "in entropy data");
{noformat}
0xff & 0xffdc = 0xdc = 220 => if b2 is not 220 then throw an ImageReadException!
So I modified
*org.apache.commons.imaging.formats.jpeg.decoder.JpegInputStream.nextBit()* to
print *b2* before the exception is thrown and executed the same test for
image.jpeg from the issue and _DSC6099.jpg from IMAGING-97:
=== b2 is 208 ===
=== b2 is 208 ===
Both issues are caused by the same problem: *b2* is 208, not 220 as expected.
Whatever *b2* is - does someone know?
was (Author: mgmechanics):
The exception is thrown from
*org.apache.commons.imaging.formats.jpeg.decoder.JpegInputStream.nextBit()*
when a marker called *b2* is not 220:
{noformat}
org.apache.commons.imaging.formats.jpeg.JpegConstants
public static final int DNL_MARKER = 0xFFdc;
org.apache.commons.imaging.formats.jpeg.decoder.JpegInputStream.nextBit()
if (b2 == (0xff & JpegConstants.DNL_MARKER)) {
throw new ImageReadException("DNL not yet supported");
}
throw new ImageReadException("Invalid marker found " + "in entropy data");
{noformat}
0xff & 0xffdc = 0xdc = 220 => if b2 is not 220 then throw an ImageReadException!
So I modified
*org.apache.commons.imaging.formats.jpeg.decoder.JpegInputStream.nextBit()* to
print *b2* before the exception is thrown and executed the same test for
image.jpeg from the issue and _DSC6099.jpg from IMAGING-97:
=== b2 is 208 ===
=== b2 is 208 ===
Both issues seems to be caused by the same problem: *b2* is 208, not 220 as
expected. Whatever *b2* is - does someone know?
> Invalid marker found in entropy data
> ------------------------------------
>
> Key: IMAGING-134
> URL: https://issues.apache.org/jira/browse/IMAGING-134
> Project: Commons Imaging
> Issue Type: Bug
> Components: Format: JPEG
> Affects Versions: 1.0
> Reporter: John Hewson
> Fix For: Patch Needed
>
> Attachments: image.jpeg
>
>
> I'm getting the following exception when trying to read a JPEG:
> Exception in thread "main" org.apache.commons.imaging.ImageReadException:
> Invalid marker found in entropy data
> at
> org.apache.commons.imaging.formats.jpeg.decoder.JpegInputStream.nextBit(JpegInputStream.java:50)
> at
> org.apache.commons.imaging.formats.jpeg.decoder.JpegDecoder.decode(JpegDecoder.java:426)
> at
> org.apache.commons.imaging.formats.jpeg.decoder.JpegDecoder.readMCU(JpegDecoder.java:320)
> at
> org.apache.commons.imaging.formats.jpeg.decoder.JpegDecoder.visitSOS(JpegDecoder.java:124)
> at
> org.apache.commons.imaging.formats.jpeg.JpegUtils.traverseJFIF(JpegUtils.java:80)
> at
> org.apache.commons.imaging.formats.jpeg.decoder.JpegDecoder.decode(JpegDecoder.java:436)
> at
> org.apache.commons.imaging.formats.jpeg.JpegImageParser.getBufferedImage(JpegImageParser.java:98)
> at
> org.apache.commons.imaging.Imaging.getBufferedImage(Imaging.java:1378)
> at
> org.apache.commons.imaging.Imaging.getBufferedImage(Imaging.java:1341)
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