before_IDAT       380 contrib/libtests/pngunknown.c    png_uint_32 before_IDAT;
before_IDAT       551 contrib/libtests/pngunknown.c          d->before_IDAT |= flag;
before_IDAT       629 contrib/libtests/pngunknown.c       return d->before_IDAT;
before_IDAT       648 contrib/libtests/pngunknown.c    d->before_IDAT = 0;
before_IDAT       656 pngtest.c            location = what | before_IDAT;
before_IDAT      1355 pngtest.c         write_chunks(write_ptr, before_IDAT); /* after PLTE */