png_image_begin_read_from_stdio 3072 contrib/libtests/pngstest.c          if (!png_image_begin_read_from_stdio(&image->image, image->input_file))
png_image_begin_read_from_stdio 3106 png.h          PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image,