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src/Source/LibPNG/pngtest.c  view on Meta::CPAN

      {
         static int wrote_question = 0;
         png_size_t num_in, num_out;
         char inbuf[256], outbuf[256];

         num_in = fread(inbuf, 1, sizeof inbuf, fpin);
         num_out = fread(outbuf, 1, sizeof outbuf, fpout);

         if (num_in != num_out)
         {
            fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
                    inname, outname);

            if (wrote_question == 0 && unsupported_chunks == 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);

            if (strict != 0 && unsupported_chunks == 0)
              return (1);

            else
              return (0);
         }

         if (num_in == 0)
            break;

         if (memcmp(inbuf, outbuf, num_in))
         {
            fprintf(STDERR, "\nFiles %s and %s are different\n", inname,
               outname);

            if (wrote_question == 0 && unsupported_chunks == 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);

            /* NOTE: the unsupported_chunks escape is permitted here because
             * unsupported text chunk compression will result in the compression
             * mode being changed (to NONE) yet, in the test case, the result
             * can be exactly the same size!
             */
            if (strict != 0 && unsupported_chunks == 0)
              return (1);

            else
              return (0);
         }
      }
   }
#endif /* WRITE */

   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, "\n 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",
      (unsigned long)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);

   /* 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