Major Description
I get this with the file PDFBOX-2376-087731.pdf:
java.lang.NullPointerException PDFBOX-2376-179204-EMC.pdf at org.apache.pdfbox.preflight.xobject.XObjImageValidator.checkColorSpaceAndImageMask(XObjImageValidator.java:132) at org.apache.pdfbox.preflight.xobject.XObjImageValidator.validate(XObjImageValidator.java:183) at org.apache.pdfbox.preflight.process.reflect.GraphicObjectPageValidationProcess.validate(GraphicObjectPageValidationProcess.java:70) at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:73) at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:52) at org.apache.pdfbox.preflight.process.reflect.ResourcesValidationProcess.validateXObjects(ResourcesValidationProcess.java:288) at org.apache.pdfbox.preflight.process.reflect.ResourcesValidationProcess.validate(ResourcesValidationProcess.java:80) at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:73) at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:52) at org.apache.pdfbox.preflight.process.reflect.SinglePageValidationProcess.validateResources(SinglePageValidationProcess.java:167) at org.apache.pdfbox.preflight.process.reflect.SinglePageValidationProcess.validate(SinglePageValidationProcess.java:82) at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:73) at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:52) at org.apache.pdfbox.preflight.process.PageTreeValidationProcess.validatePage(PageTreeValidationProcess.java:56) at org.apache.pdfbox.preflight.process.PageTreeValidationProcess.validate(PageTreeValidationProcess.java:45) at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:73) at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:88) at org.apache.pdfbox.preflight.PreflightDocument.validate(PreflightDocument.java:168) at pdfboxpageimageextraction.PreflightTest.main(PreflightTest.java:47)
The cause is this piece of code:
Integer bitsPerCompValue = COSUtils.getAsInteger(bitsPerComp, cosDocument); if (bitsPerCompValue != 1)
which fails on this input:
44 0 obj<</Length 289/Filter/CCITTFaxDecode/DecodeParms<</K -1/Columns 282/Rows 40>>/Width 282/Height 40/ImageMask true/Subtype/Image>>
That segment is called only for image masks. The spec does not require BitsPerComponent for image masks, but if it is there, it must be 1. So all I have to do is to add a null check.