code: public static function map($color, $palette, $version)
      {
          if ($color <= 0x07 || $color >= 0x40) {
              // special built-in color
              return Color\BuiltIn::lookup($color);
          } elseif (isset($palette, $palette[$color - 8])) {
              // palette color, color index 0x08 maps to pallete index 0
              return $palette[$color - 8];
          }
  
          // default color table
          if ($version == Xls::XLS_BIFF8) {
              return Color\BIFF8::lookup($color);
          }
  
          // BIFF5
          return Color\BIFF5::lookup($color);
      }
docs: Read color.
  
  @param int $color Indexed color
  @param array $palette Color palette
  @param int $version
  
  @return array RGB color value, example: ['rgb' => 'FF0000']