32       png_image image;  in main()  local
35       memset(&image, 0, sizeof image);  in main()
36       image.version = PNG_IMAGE_VERSION;  in main()
38       if (png_image_begin_read_from_file(&image, argv[1]))  in main()
45          image.format = PNG_FORMAT_RGBA;  in main()
47          buffer = malloc(PNG_IMAGE_SIZE(image));  in main()
51             if (png_image_finish_read(&image, NULL/*background*/, buffer,  in main()
54                if (png_image_write_to_file(&image, argv[2],  in main()
61                       image.message);  in main()
69                    image.message);  in main()
75                png_image_free(&image);  in main()
81                (unsigned long)PNG_IMAGE_SIZE(image));  in main()
86          fprintf(stderr, "pngtopng: %s: %s\n", argv[1], image.message);  in main()