Ability to emulate a featured bug with mkisofs -C : read 16 block too early

libisoburn/burn_wrap.c

@@ -1427,6 +1427,8 @@ int isoburn_drive_set_msgs_submit(struct burn_drive *d,
 }
 
  
+/* @param flag bit0= with adr_mode 3: adr_value might be 16 blocks too high
+*/
 int isoburn_set_msc1(struct burn_drive *d, int adr_mode, char *adr_value,
                      int flag)
 {
@@ -1498,7 +1500,14 @@ not_found:;
 
  } else if(adr_mode==3) {
    o->fabricated_msc1= adr_num;
+   if((flag & 1) && o->fabricated_msc1 >= 16) {
 
+     /* MULTI : adr_num is possibly 16 blocks too high */;
+
+     ret= isoburn_read_iso_head(d, o->fabricated_msc1, &size,volid, 1|(1<<14));
+     if(ret==2)
+       o->fabricated_msc1-= 16;
+   }
  } else if(adr_mode==4) {
    /* search for volume id that is equal to adr_value */
    best_lba= -1;

libisoburn/libisoburn.h

@@ -433,7 +433,7 @@ int isoburn_disc_erasable(struct burn_drive *d);
 void isoburn_disc_erase(struct burn_drive *drive, int fast);
 
 
-/** Program isoburn_disc_get_msc1() to return a fabricated value.
+/** Set up isoburn_disc_get_msc1() to return a fabricated value.
     This makes only sense between aquiring the drive and reading the
     image. After isoburn_read_image() it will confuse the coordination
     of libisoburn and libisofs.
@@ -450,7 +450,11 @@ void isoburn_disc_erase(struct burn_drive *drive, int fast);
                     4= start lba of last session with volume id
                        given by adr_value
     @parm adr_value A string describing the value to be eventually used.
-    @param flag Bitfield for control purposes. Unused yet. Submit 0.
+    @param flag Bitfield for control purposes.
+                bit0= @since 0.2.2
+                      with adr_mode 3: adr_value might be 16 blocks too high
+                      (e.g. -C stemming from growisofs). Probe for ISO head
+                      at adr_value-16 and eventually adjust setting. 
 */
 int isoburn_set_msc1(struct burn_drive *d, int adr_mode, char *adr_value,
                      int flag);
@@ -570,7 +574,7 @@ void isoburn_toc_track_get_entry(struct isoburn_toc_track *t,
 void isoburn_toc_disc_free(struct isoburn_toc_disc *disc);
 
 
-/** Try whether at the data at the given address look like a ISO 9660
+/** Try whether the data at the given address look like a ISO 9660
     image header and obtain its alleged size. Depending on the info mode
     one other string of text information can be retrieved too.
     @since 0.1.6
@@ -588,7 +592,7 @@ void isoburn_toc_disc_free(struct isoburn_toc_disc *disc);
                 bit14= check both half buffers (not only second)
                        return 2 if found in first block
                 bit15= return-1 on read error
-    @return 1 seems to be a valid ISO image , 0 format not recognized, <0 error
+    @return >0 seems to be a valid ISO image, 0 format not recognized, <0 error
 */
 int isoburn_read_iso_head(struct burn_drive *d, int lba,
                           int *image_blocks, char *info, int flag);
@@ -1050,6 +1054,9 @@ off_t isoburn_disc_available_space(struct burn_drive *d,
     case of random access media this will always be 0. Succesfull return is
     not a guarantee that there is a ISO-9660 image at all. The call will fail,
     nevertheless,if isoburn_disc_get_status() returns not BURN_DISC_APPENDABLE.
+    Note: The result of this call may be fabricated by a previous call of
+    isoburn_set_msc1() which can override the rule to load the most recent
+    session.
     Wrapper for: burn_disc_get_msc1()
     @since 0.1.0
     @param d         The drive to inquire

xorriso/xorriso_timestamp.h

@@ -1 +1 @@
-#define Xorriso_timestamP "2008.07.16.140043"
+#define Xorriso_timestamP "2008.07.17.110812"