ftrandom.c

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    struct dirent*  ent;

    int             i, max;
    char            buffer[1025];
    struct stat     statb;


    max  = 0;
    fcnt = 0;

    for ( i = 0; fontdirs[i] != NULL; ++i )
    {
      examples = opendir( fontdirs[i] );
      if ( examples == NULL )
      {
        fprintf( stderr,
                 "Can't open example font directory `%s'\n",
                 fontdirs[i] );
        exit( 1 );
      }

      while ( ( ent = readdir( examples ) ) != NULL )
      {
        snprintf( buffer, sizeof ( buffer ),
                  "%s/%s", fontdirs[i], ent->d_name );
        if ( stat( buffer, &statb ) == -1 || S_ISDIR( statb.st_mode ) )
          continue;
        if ( extensions == NULL || extmatch( buffer, extensions ) )
        {
          if ( fcnt >= max )
          {
            max += 100;
            fontlist = realloc( fontlist, max * sizeof ( struct fontlist ) );
            if ( fontlist == NULL )
            {
              fprintf( stderr, "Can't allocate memory\n" );
              exit( 1 );
            }
          }

          fontlist[fcnt].name = strdup( buffer );
          fontlist[fcnt].len  = statb.st_size;

          figurefiletype( &fontlist[fcnt] );
          ++fcnt;
        }
      }

      closedir( examples );
    }

    if ( fcnt == 0 )
    {
      fprintf( stderr, "Can't find matching font files.\n" );
      exit( 1 );
    }

    fontlist[fcnt].name = NULL;
  }


  static int
  getErrorCnt( struct fontlist*  item )
  {
    if ( error_count == 0 && error_fraction == 0 )
      return 0;

    return error_count + ceil( error_fraction * item->len );
  }


  static int
  getRandom( int  low,
             int  high )
  {
    if ( low - high < 0x10000L )
      return low + ( ( random() >> 8 ) % ( high + 1 - low ) );

    return low + ( random() % ( high + 1 - low ) );
  }


  static int
  copyfont( struct fontlist*  item,
            char*             newfont )
  {
    static char  buffer[8096];
    FILE         *good, *new;
    int          len;
    int          i, err_cnt;


    good = fopen( item->name, "r" );
    if ( good == NULL )
    {
      fprintf( stderr, "Can't open `%s'\n", item->name );
      return false;
    }

    new = fopen( newfont, "w+" );
    if ( new == NULL )
    {
      fprintf( stderr, "Can't create temporary output file `%s'\n",
               newfont );
      exit( 1 );
    }

    while ( ( len = fread( buffer, 1, sizeof ( buffer ), good ) ) > 0 )
      fwrite( buffer, 1, len, new );

    fclose( good );

    err_cnt = getErrorCnt( item );
    for ( i = 0; i < err_cnt; ++i )
    {
      fseek( new, getRandom( 0, item->len - 1 ), SEEK_SET );

      if ( item->isbinary )
        putc( getRandom( 0, 0xff ), new );
      else if ( item->isascii )
        putc( getRandom( 0x20, 0x7e ), new );
      else
      {
        int  hex = getRandom( 0, 15 );


        if ( hex < 10 )
          hex += '0';
        else
          hex += 'A' - 10;

        putc( hex, new );
      }
    }

    if ( ferror( new ) )
    {
      fclose( new );
      unlink( newfont );
      return false;
    }

    fclose( new );

    return true;
  }


  static int  child_pid;

  static void
  abort_test( int  sig )
  {
    /* If a time-out happens, then kill the child */
    kill( child_pid, SIGFPE );
    write( 2, "Timeout... ", 11 );
  }


  static void
  do_test( void )
  {
    int         i        = getRandom( 0, fcnt - 1 );
    static int  test_num = 0;
    char        buffer[1024];


    sprintf( buffer, "%s/test%d", results_dir, test_num++ );

    if ( copyfont ( &fontlist[i], buffer ) )
    {
      signal( SIGALRM, abort_test );
      /* Anything that takes more than 20 seconds */
      /* to parse and/or rasterize is an error.   */
      alarm( 20 );
      if ( ( child_pid = fork() ) == 0 )
        ExecuteTest( buffer );
      else if ( child_pid != -1 )
      {
        int  status;


        waitpid( child_pid, &status, 0 );
        alarm( 0 );
        if ( WIFSIGNALED ( status ) )
          printf( "Error found in file `%s'\n", buffer );
        else
          unlink( buffer );
      }
      else
      {
        fprintf( stderr, "Can't fork test case.\n" );
        exit( 1 );
      }
      alarm( 0 );
    }
  }


  static void
  usage( FILE*  out,
         char*  name )
  {
    fprintf( out, "%s [options] -- Generate random erroneous fonts\n"
                  "  and attempt to parse them with FreeType.\n\n", name );

    fprintf( out, "  --all                    All non-directory files are assumed to be fonts.\n" );
    fprintf( out, "  --check-outlines         Make sure we can parse the outlines of each glyph.\n" );
    fprintf( out, "  --dir <path>             Append <path> to list of font search directories.\n" );
    fprintf( out, "  --error-count <cnt>      Introduce <cnt> single byte errors into each font.\n" );
    fprintf( out, "  --error-fraction <frac>  Introduce <frac>*filesize single byte errors\n"
                  "                           into each font.\n" );
    fprintf( out, "  --ext <ext>              Add <ext> to list of extensions indicating fonts.\n" );
    fprintf( out, "  --help                   Print this.\n" );
    fprintf( out, "  --nohints                Turn off hinting.\n" );
    fprintf( out, "  --rasterize              Attempt to rasterize each glyph.\n" );
    fprintf( out, "  --results <dir>          Directory in which to place the test fonts.\n" );
    fprintf( out, "  --size <float>           Use the given font size for the tests.\n" );
    fprintf( out, "  --test <file>            Run a single test on an already existing file.\n" );
  }


  int
  main( int     argc,
        char**  argv )
  {
    char    **dirs, **exts;
    char    *pt, *end;
    int     dcnt = 0, ecnt = 0, rset = false, allexts = false;
    int     i;
    time_t  now;
    char*   testfile = NULL;


    dirs = calloc( argc + 1, sizeof ( char ** ) );
    exts = calloc( argc + 1, sizeof ( char ** ) );

    for ( i = 1; i < argc; ++i )
    {
      pt = argv[i];
      if ( pt[0] == '-' && pt[1] == '-' )
        ++pt;

      if ( strcmp( pt, "-all" ) == 0 )
        allexts = true;
      else if ( strcmp( pt, "-check-outlines" ) == 0 )
        check_outlines = true;
      else if ( strcmp( pt, "-dir" ) == 0 )
        dirs[dcnt++] = argv[++i];
      else if ( strcmp( pt, "-error-count" ) == 0 )
      {
        if ( !rset )
          error_fraction = 0;
        rset = true;
        error_count = strtol( argv[++i], &end, 10 );
        if ( *end != '\0' )
        {
          fprintf( stderr, "Bad value for error-count: %s\n", argv[i] );
          exit( 1 );
        }
      }
      else if ( strcmp( pt, "-error-fraction" ) == 0 )
      {
        if ( !rset )
          error_count = 0;
        rset = true;
        error_fraction = strtod( argv[++i], &end );
        if ( *end != '\0' )
        {
          fprintf( stderr, "Bad value for error-fraction: %s\n", argv[i] );
          exit( 1 );
        }
      }
      else if ( strcmp( pt, "-ext" ) == 0 )
        exts[ecnt++] = argv[++i];
      else if ( strcmp( pt, "-help" ) == 0 )
      {
        usage( stdout, argv[0] );
        exit( 0 );
      }
      else if ( strcmp( pt, "-nohints" ) == 0 )
        nohints = true;
      else if ( strcmp( pt, "-rasterize" ) == 0 )
        rasterize = true;
      else if ( strcmp( pt, "-results" ) == 0 )
        results_dir = argv[++i];
      else if ( strcmp( pt, "-size" ) == 0 )
      {
        font_size = (FT_F26Dot6)( strtod( argv[++i], &end ) * 64 );
        if ( *end != '\0' || font_size < 64 )
        {
          fprintf( stderr, "Bad value for size: %s\n", argv[i] );
          exit( 1 );
        }
      }
      else if ( strcmp( pt, "-test" ) == 0 )
        testfile = argv[++i];
      else
      {
        usage( stderr, argv[0] );
        exit( 1 );
      }
    }

    if ( allexts )
      exts = NULL;
    else if ( ecnt == 0 )
      exts = default_ext_list;

    if ( dcnt == 0 )
      dirs = default_dir_list;

    if ( testfile != NULL )
      ExecuteTest( testfile );         /* This should never return */

    time( &now );
    srandom( now );

    FindFonts( dirs, exts );
    mkdir( results_dir, 0755 );

    forever
      do_test();

    return 0;
  }


/* EOF */