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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hello All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Please review the following fix in JDK10 :<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Bug : <a href="https://bugs.openjdk.java.net/browse/JDK-8191431">https://bugs.openjdk.java.net/browse/JDK-8191431</a> <o:p></o:p></p><p class=MsoNormal>Webrev : <a href="http://cr.openjdk.java.net/~jdv/8191431/webrev.00/">http://cr.openjdk.java.net/~jdv/8191431/webrev.00/</a> <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Issue : When we try to read multiple PNG images with different IDAT chunk positions using the same PNGImageReader instance we get “IIOException: Error reading PNG image data”.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Root cause : Issue is happening because of changes present in <a href="https://bugs.openjdk.java.net/browse/JDK-8164971">JDK-8164971</a>.<o:p></o:p></p><p class=MsoNormal> Under <a href="https://bugs.openjdk.java.net/browse/JDK-8164971">JDK-8164971</a> we have made changes such that imageStartPosition for IDAT chunk will be updated only once for a given PNGImageReader instance while reading metadata.<o:p></o:p></p><p class=MsoNormal> case IDAT_TYPE:<o:p></o:p></p><p class=MsoNormal> // If chunk type is 'IDAT', we've reached the image data.<o:p></o:p></p><p class=MsoNormal> if (imageStartPosition == -1L) {<o:p></o:p></p><p class=MsoNormal> /*<o:p></o:p></p><p class=MsoNormal> * PNGs may contain multiple IDAT chunks containing<o:p></o:p></p><p class=MsoNormal> * a portion of image data. We store the position of<o:p></o:p></p><p class=MsoNormal> * the first IDAT chunk and continue with iteration<o:p></o:p></p><p class=MsoNormal> * of other chunks that follow image data.<o:p></o:p></p><p class=MsoNormal> */<o:p></o:p></p><p class=MsoNormal> imageStartPosition = stream.getStreamPosition() - 8;<o:p></o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> When we use same PNGImageReader instance to read another PNG image and if IDAT chunk position and length differs we will get IIOException.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Solution : We already have resetStreamSettings() method which we call when user tries to decode an image under ImageReader.setInput(). In resetStreamSettings() function if we initialize imageStartPosition to ‘-1L’ it will resolve this issue.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Jay<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>