png_oFFs          114 contrib/libtests/pngunknown.c #define png_oFFs PNG_U32(111,  70,  70, 115)
png_oFFs          123 contrib/tools/pngfix.c #define png_oFFs PNG_U32(111,  70,  70, 115)
png_oFFs          766 pngpriv.h      #define png_oFFs PNG_U32(111,  70,  70, 115)