New -boot_image bootspecs hfsplus_block_size= and apm_block_size=

xorriso/xorriso_private.h

@@ -424,6 +424,11 @@ struct XorrisO { /* the global context of xorriso */
  */
  uint8_t hfsp_serial_number[8];
 
+ /* Allocation block size of HFS+  and APM : 0= auto , 512, or 2048
+ */
+ int hfsp_block_size;
+ int apm_block_size;
+
  /* User settable PVD time stamps */
  time_t vol_creation_time;
  time_t vol_modification_time;