Implemented in xorriso provisory 1 MB alignement for MBR enhanced ISO images

xorriso/xorrisoburn.c

@@ -821,6 +821,13 @@ no_track:;
      Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "NOTE", 0);
    }
  }
+ if(xorriso->alignment > 0) {
+   if(img_sectors > 0)
+     padding+= xorriso->alignment
+               - ((img_sectors + padding) % xorriso->alignment);
+   else if(padding < xorriso->alignment)
+     padding= xorriso->alignment;
+ }
  burn_track_define_data(tracks[0], 0, padding * 2048, 0, BURN_MODE1);
  Xorriso_process_msg_queues(xorriso,0);
 
@@ -890,6 +897,7 @@ int Xorriso_set_isolinux_options(struct XorrisO *xorriso,
  if(make_isohybrid_mbr) {
    sprintf(xorriso->info_text, "Will write isohybrid MBR.");
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "NOTE", 0);
+   xorriso->alignment= 512;
  }
 
  ret= el_torito_set_isolinux_options(bootimg, 1 | (make_isohybrid_mbr << 1),0);
@@ -982,6 +990,7 @@ int Xorriso_write_session(struct XorrisO *xorriso, int flag)
  }
  relax= isoburn_igopt_allow_deep_paths;
 
+ xorriso->alignment= 0;
  /* Activate, adjust or discard boot image */
  image= isoburn_get_attached_image(source_drive);
  /* >>> ??? move down to libisoburn ? */