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internal struct (png_transform_control) to replace row_info and uses that to implement affirms correctly. The change also adds checks on the rowbytes calculation and additional checks on most transform implementations. Added png_uint_16 range checking, pngvalid tRNS, fixed png_uint_16: review of previous checks, removal of some where SAFE. pngvalid: add testing of tRNS for better code coverage pngvalid: correct rgb-to-gray error calculations. Code coverage is still incomplete: see /*UNTESTED*/ in pngrtran.c