[OpenJDK 2D-Dev] [15] RFR JDK-8242557: Add length limit for strings in PNGImageWriter

[Jayathirth D v]

Hello All,

Please review the following fix for JDK 15:

Bug : https://bugs.openjdk.java.net/browse/JDK-8242557 <https://bugs.openjdk.java.net/browse/JDK-8242557> 
Webrev : http://cr.openjdk.java.net/~jdv/8242557/webrev.00/ <http://cr.openjdk.java.net/~jdv/8242557/webrev.00/> 

Issue : PNG specification restricts length of strings in some chunks to 79(http://www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html <http://www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html> ) excluding null termination. But our writer implementation has no such check.
Solution : Add checks in different chunks where there must be restrictions.

Thanks,
Jay
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