Enabled multi-session with partition offset

libisoburn/libisoburn.h

@@ -1361,6 +1361,24 @@ int isoburn_set_read_pacifier(struct burn_drive *drive,
                               int (*read_pacifier)(IsoImage*, IsoFileSource*),
                               void *app_handle);
 
+/** TWINTREE:
+    Inquire the partition offset of the loaded image. The first 512 bytes of
+    the image get examined whether they bear an MBR signature and a first
+    partition table entry which matches the size of the image. In this case
+    the start address is recorded as partition offset and internal buffers
+    get adjusted.
+    See also isoburn_igopt_set_part_offset().
+    @since 0.6.2
+    @param drive           The drive with the loaded image
+    @param block_offset_2k returns the recognized partition offset
+    @return <0 = error
+             0 = no partition offset recognized
+             1 = acceptable non-zero offset, buffers are adjusted
+             2 = offset is credible but not acceptable for buffer size
+*/ 
+int isoburn_get_img_partition_offset(struct burn_drive *drive,
+                                     uint32_t *block_offset_2k);
+
 
 /** Set the IsoImage to be used with a drive. This eventually releases
     the reference to the old IsoImage attached to the drive.
@@ -1659,3 +1677,7 @@ void isoburn_finish(void);
 int isoburn_needs_emulation(struct burn_drive *d);
  
 
+/* ---------------------------- Test area ----------------------------- */
+
+/* no tests active, currently */
+