[PDFBOX-2570] ClassCastException in PDCalGray: COSFloat cannot be cast to COSArray

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: Parsing
• Labels: CalGray CalRGB regression
• Assignee: Unassigned
• Reporter: Tilman Hausherr
• Created: 15/Dec/14 17:06
• Updated: 17/Mar/16 19:07
• Resolved: 17/Dec/14 21:25

Description

INFORMATION: Rendering: PDFBOX-1724.pdf
java.lang.ClassCastException: org.apache.pdfbox.cos.COSFloat cannot be cast to org.apache.pdfbox.cos.COSArray
	at org.apache.pdfbox.pdmodel.graphics.color.PDCalRGB.getGamma(PDCalRGB.java:158)
	at org.apache.pdfbox.pdmodel.graphics.color.PDCalRGB.toRGB(PDCalRGB.java:95)
	at org.apache.pdfbox.pdmodel.graphics.color.PDCalGray.toRGB(PDCalGray.java:81)
	at org.apache.pdfbox.pdmodel.graphics.color.PDCIEBasedColorSpace.toRGBImage(PDCIEBasedColorSpace.java:88)

The cause is that in one of the redesigns it was overseen that the Gamma is a single value for CalGray, and not an array like in CalRGB. Thus PDCalGray cannot be extended from PDCalRGB. The bug didn't have an effect because the gamma wasn't used before PDFBOX-2553. Instead I will extend it from PDCIEBasedColorSpace or from a new abstract class PDCalBasedColorSpace.