if (num_unknowns)
      {
         png_size_t i;
         png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
           num_unknowns);
         /* copy the locations from the read_info_ptr.  The automatically
            generated locations in write_end_info_ptr are wrong because we
            haven't written the end_info yet */
         for (i = 0; i < (png_size_t)num_unknowns; i++)
           png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
             unknowns[i].location);
      }
   }
#endif
#ifdef PNG_WRITE_SUPPORTED
   png_write_end(write_ptr, write_end_info_ptr);
#endif

#ifdef PNG_EASY_ACCESS_SUPPORTED
   if(verbose)
   {
      png_uint_32 iwidth, iheight;
      iwidth = png_get_image_width(write_ptr, write_info_ptr);
      iheight = png_get_image_height(write_ptr, write_info_ptr);
      fprintf(STDERR, "Image width = %lu, height = %lu\n",
         iwidth, iheight);
   }
#endif

   png_debug(0, "Destroying data structs\n");
#ifdef SINGLE_ROWBUF_ALLOC
   png_debug(1, "destroying row_buf for read_ptr\n");
   png_free(read_ptr, row_buf);
   row_buf=NULL;
#endif /* SINGLE_ROWBUF_ALLOC */
   png_debug(1, "destroying read_ptr, read_info_ptr, end_info_ptr\n");
   png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
#ifdef PNG_WRITE_SUPPORTED
   png_debug(1, "destroying write_end_info_ptr\n");
   png_destroy_info_struct(write_ptr, &write_end_info_ptr);
   png_debug(1, "destroying write_ptr, write_info_ptr\n");
   png_destroy_write_struct(&write_ptr, &write_info_ptr);
#endif
   png_debug(0, "Destruction complete.\n");

   FCLOSE(fpin);
   FCLOSE(fpout);

   png_debug(0, "Opening files for comparison\n");
#if defined(_WIN32_WCE)
   MultiByteToWideChar(CP_ACP, 0, inname, -1, path, MAX_PATH);
   if ((fpin = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
#else
   if ((fpin = fopen(inname, "rb")) == NULL)
#endif
   {
      fprintf(STDERR, "Could not find file %s\n", inname);
      return (1);
   }

#if defined(_WIN32_WCE)
   MultiByteToWideChar(CP_ACP, 0, outname, -1, path, MAX_PATH);
   if ((fpout = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
#else
   if ((fpout = fopen(outname, "rb")) == NULL)
#endif
   {
      fprintf(STDERR, "Could not find file %s\n", outname);
      FCLOSE(fpin);
      return (1);
   }

   for(;;)
   {
      png_size_t num_in, num_out;

      READFILE(fpin, inbuf, 1, num_in);
      READFILE(fpout, outbuf, 1, num_out);

      if (num_in != num_out)
      {
         fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
                 inname, outname);
         if(wrote_question == 0)
         {
            fprintf(STDERR,
         "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
              inname,PNG_ZBUF_SIZE);
            fprintf(STDERR,
              "\n   filtering heuristic (libpng default), compression");
            fprintf(STDERR,
              " level (zlib default),\n   and zlib version (%s)?\n\n",
              ZLIB_VERSION);
            wrote_question=1;
         }
         FCLOSE(fpin);
         FCLOSE(fpout);
         return (0);
      }

      if (!num_in)
         break;

      if (png_memcmp(inbuf, outbuf, num_in))
      {
         fprintf(STDERR, "\nFiles %s and %s are different\n", inname, outname);
         if(wrote_question == 0)
         {
            fprintf(STDERR,
         "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
                 inname,PNG_ZBUF_SIZE);
            fprintf(STDERR,
              "\n   filtering heuristic (libpng default), compression");
            fprintf(STDERR,
              " level (zlib default),\n   and zlib version (%s)?\n\n",
              ZLIB_VERSION);
            wrote_question=1;
         }
         FCLOSE(fpin);
         FCLOSE(fpout);
         return (0);
      }
   }

   FCLOSE(fpin);
   FCLOSE(fpout);

   return (0);
}

/* input and output filenames */
#ifdef RISCOS
static PNG_CONST char *inname = "pngtest/png";
static PNG_CONST char *outname = "pngout/png";
#else
static PNG_CONST char *inname = "pngtest.png";
static PNG_CONST char *outname = "pngout.png";
#endif

int
main(int argc, char *argv[])
{
   int multiple = 0;
   int ierror = 0;

   fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
   fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
   fprintf(STDERR,"%s",png_get_copyright(NULL));
   /* Show the version of libpng used in building the library */
   fprintf(STDERR," library (%lu):%s", png_access_version_number(),
      png_get_header_version(NULL));
   /* Show the version of libpng used in building the application */
   fprintf(STDERR," pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
      PNG_HEADER_VERSION_STRING);
   fprintf(STDERR," png_sizeof(png_struct)=%ld, png_sizeof(png_info)=%ld\n",
                    (long)png_sizeof(png_struct), (long)png_sizeof(png_info));

   /* Do some consistency checking on the memory allocation settings, I'm
      not sure this matters, but it is nice to know, the first of these
      tests should be impossible because of the way the macros are set
      in pngconf.h */
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
      fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
#endif
   /* I think the following can happen. */
#if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
      fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
#endif

   if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
   {
      fprintf(STDERR,
         "Warning: versions are different between png.h and png.c\n");
      fprintf(STDERR, "  png.h version: %s\n", PNG_LIBPNG_VER_STRING);
      fprintf(STDERR, "  png.c version: %s\n\n", png_libpng_ver);
      ++ierror;
   }

   if (argc > 1)
   {
      if (strcmp(argv[1], "-m") == 0)
      {
         multiple = 1;
         status_dots_requested = 0;
      }
      else if (strcmp(argv[1], "-mv") == 0 ||
               strcmp(argv[1], "-vm") == 0 )
      {
         multiple = 1;
         verbose = 1;
         status_dots_requested = 1;
      }
      else if (strcmp(argv[1], "-v") == 0)
      {
         verbose = 1;
         status_dots_requested = 1;
         inname = argv[2];
      }
      else
      {
         inname = argv[1];
         status_dots_requested = 0;
      }
   }

   if (!multiple && argc == 3+verbose)
     outname = argv[2+verbose];

   if ((!multiple && argc > 3+verbose) || (multiple && argc < 2))
   {
     fprintf(STDERR,
       "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
        argv[0], argv[0]);
     fprintf(STDERR,
       "  reads/writes one PNG file (without -m) or multiple files (-m)\n");
     fprintf(STDERR,
       "  with -m %s is used as a temporary file\n", outname);
     exit(1);
   }

   if (multiple)
   {
      int i;
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
      int allocation_now = current_allocation;
#endif
      for (i=2; i<argc; ++i)
      {
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
         int k;
#endif
         int kerror;
         fprintf(STDERR, "Testing %s:",argv[i]);
         kerror = test_one_file(argv[i], outname);
         if (kerror == 0)
         {
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
            fprintf(STDERR, "\n PASS (%lu zero samples)\n",zero_samples);
#else
            fprintf(STDERR, " PASS\n");
#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
            for (k=0; k<256; k++)
               if(filters_used[k])
                  fprintf(STDERR, " Filter %d was used %lu times\n",
                     k,filters_used[k]);
#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
         if(tIME_chunk_present != 0)
            fprintf(STDERR, " tIME = %s\n",tIME_string);
         tIME_chunk_present = 0;
#endif /* PNG_TIME_RFC1123_SUPPORTED */
         }
         else
         {
            fprintf(STDERR, " FAIL\n");
            ierror += kerror;
         }
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
         if (allocation_now != current_allocation)
            fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
               current_allocation-allocation_now);
         if (current_allocation != 0)
         {
            memory_infop pinfo = pinformation;

            fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
               current_allocation);
            while (pinfo != NULL)
            {
               fprintf(STDERR, " %lu bytes at %x\n", pinfo->size, 
                 (unsigned int) pinfo->pointer);
               pinfo = pinfo->next;
            }
         }
#endif
      }
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
         fprintf(STDERR, " Current memory allocation: %10d bytes\n",
            current_allocation);
         fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
            maximum_allocation);
         fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
            total_allocation);
         fprintf(STDERR, "     Number of allocations: %10d\n",
            num_allocations);
#endif
   }
   else
   {
      int i;
      for (i=0; i<3; ++i)
      {
         int kerror;
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
         int allocation_now = current_allocation;
#endif
         if (i == 1) status_dots_requested = 1;
         else if(verbose == 0)status_dots_requested = 0;
         if (i == 0 || verbose == 1 || ierror != 0)
            fprintf(STDERR, "Testing %s:",inname);
         kerror = test_one_file(inname, outname);
         if(kerror == 0)
         {
            if(verbose == 1 || i == 2)
            {
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
                int k;
#endif
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
                fprintf(STDERR, "\n PASS (%lu zero samples)\n",zero_samples);
#else
                fprintf(STDERR, " PASS\n");
#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
                for (k=0; k<256; k++)
                   if(filters_used[k])
                      fprintf(STDERR, " Filter %d was used %lu times\n",
                         k,filters_used[k]);
#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
             if(tIME_chunk_present != 0)
                fprintf(STDERR, " tIME = %s\n",tIME_string);
#endif /* PNG_TIME_RFC1123_SUPPORTED */
            }
         }
         else
         {
            if(verbose == 0 && i != 2)
               fprintf(STDERR, "Testing %s:",inname);
            fprintf(STDERR, " FAIL\n");
            ierror += kerror;
         }
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
         if (allocation_now != current_allocation)
             fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
               current_allocation-allocation_now);
         if (current_allocation != 0)
         {
             memory_infop pinfo = pinformation;

             fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
                current_allocation);
             while (pinfo != NULL)
             {
                fprintf(STDERR," %lu bytes at %x\n",
                   pinfo->size, (unsigned int)pinfo->pointer);
                pinfo = pinfo->next;
             }
          }
#endif
       }
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
       fprintf(STDERR, " Current memory allocation: %10d bytes\n",
          current_allocation);
       fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
          maximum_allocation);
       fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
          total_allocation);
       fprintf(STDERR, "     Number of allocations: %10d\n",
            num_allocations);
#endif
   }

#ifdef PNGTEST_TIMING
   t_stop = (float)clock();
   t_misc += (t_stop - t_start);
   t_start = t_stop;
   fprintf(STDERR," CPU time used = %.3f seconds",
      (t_misc+t_decode+t_encode)/(float)CLOCKS_PER_SEC);
   fprintf(STDERR," (decoding %.3f,\n",
      t_decode/(float)CLOCKS_PER_SEC);
   fprintf(STDERR,"        encoding %.3f ,",
      t_encode/(float)CLOCKS_PER_SEC);
   fprintf(STDERR," other %.3f seconds)\n\n",
      t_misc/(float)CLOCKS_PER_SEC);
#endif

   if (ierror == 0)
      fprintf(STDERR, "libpng passes test\n");
   else
      fprintf(STDERR, "libpng FAILS test\n");
   return (int)(ierror != 0);
}

/* Generate a compiler error if there is an old png.h in the search path. */
typedef version_1_2_7 your_png_h_is_not_version_1_2_7;