Compile time check of libisoburn. Enforced minimum track size of 300 sectors.

xorriso/xorriso_timestamp.h

@@ -1 +1 @@
-#define Xorriso_timestamP "2008.02.02.131903"
+#define Xorriso_timestamP "2008.02.02.181200"

xorriso/xorrisoburn.c

@@ -71,6 +71,9 @@ int Xorriso_pacifier_loop(struct XorrisO *xorriso, struct burn_drive *drive,
                              S_ISSOCK(iso_node_get_mode(node)))
 
 
+#define Xorriso_min_track_sizE 300
+
+
 /* ------------------------------------------------------------------------ */
 
 
@@ -80,6 +83,49 @@ int Xorriso_startup_libraries(struct XorrisO *xorriso, int flag)
  char *handler_prefix= NULL;
  char *queue_sev, *print_sev, reason[1024];
 
+
+/* First an ugly compile time check for header version compatibility.
+   If everthing matches, then no C code is produced. In case of mismatch,
+   intentionally faulty C code will be inserted.
+*/
+
+/* The minimum requirement of xorriso towards the libisoburn header
+   at compile time is defined in xorriso/xorrisoburn.h 
+     xorriso_libisoburn_req_major
+     xorriso_libisoburn_req_minor
+     xorriso_libisoburn_req_micro
+   It gets compared against the version macros in libburn/libburn.h :
+     isoburn_header_version_major
+     isoburn_header_version_minor
+     isoburn_header_version_micro
+   If the header is too old then the following code shall cause failure of
+   cdrskin compilation rather than to allow production of a program with
+   unpredictable bugs or memory corruption.
+   The compiler messages supposed to appear in this case are:
+      error: 'LIBISOBURN_MISCONFIGURATION' undeclared (first use in this function)
+      error: 'INTENTIONAL_ABORT_OF_COMPILATION__HEADERFILE_libisoburn_dot_h_TOO_OLD__SEE_xorrisoburn_dot_c' undeclared (first use in this function)
+      error: 'LIBISOBURN_MISCONFIGURATION_' undeclared (first use in this function)
+*/
+/* The indendation is an advise of man gcc to help old compilers ignoring */
+ #if xorriso_libisoburn_req_major > isoburn_header_version_major
+ #define Isoburn_libisoburn_dot_h_too_olD 1
+ #endif
+ #if xorriso_libisoburn_req_major == isoburn_header_version_major && xorriso_libisoburn_req_minor > isoburn_header_version_minor
+ #define Isoburn_libisoburn_dot_h_too_olD 1
+ #endif
+ #if xorriso_libisoburn_req_minor == isoburn_header_version_minor && xorriso_libisoburn_req_micro > isoburn_header_version_micro
+ #define Isoburn_libisoburn_dot_h_too_olD 1
+ #endif
+
+#ifdef Isoburn_libisoburn_dot_h_too_olD
+LIBISOBURN_MISCONFIGURATION = 0;
+INTENTIONAL_ABORT_OF_COMPILATION__HEADERFILE_libisoburn_dot_h_TOO_OLD__SEE_xorrisoburn_dot_c = 0;
+LIBISOBURN_MISCONFIGURATION_ = 0;
+#endif
+
+/* End of ugly compile time test (scroll up for explanation) */
+
+
  sprintf(xorriso->info_text, "Starting up libraries ...\n");
  Xorriso_info(xorriso, 0);
 
@@ -546,7 +592,7 @@ int Xorriso_make_write_options(
 */
 int Xorriso_write_session(struct XorrisO *xorriso, int flag)
 {
- int ret, media_space;
+ int ret, media_space, img_sectors;
  struct isoburn_imgen_opts *sopts= NULL;
  struct burn_drive_info *dinfo, *source_dinfo;
  struct burn_drive *drive, *source_drive;
@@ -635,19 +681,42 @@ int Xorriso_write_session(struct XorrisO *xorriso, int flag)
  if(ret<=0)
    goto ex;
 
- ret= burn_disc_get_sectors(disc);
+ ret= img_sectors= burn_disc_get_sectors(disc);
  if(flag&1)
    goto ex;
 
  media_space= burn_disc_available_space(drive, burn_options) / (off_t) 2048;
- if(media_space < ret) {
+ if(media_space < img_sectors || media_space < Xorriso_min_track_sizE) {
    Xorriso_process_msg_queues(xorriso,0);
    sprintf(xorriso->info_text,"Image size %ds exceeds free space on media %ds",
-           ret, media_space);
+          (img_sectors < Xorriso_min_track_sizE ? Xorriso_min_track_sizE
+                                                : img_sectors ),
+           media_space);
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "SORRY", 0);
    {ret= 0; goto ex;}
  }
 
+ if(img_sectors < Xorriso_min_track_sizE) {
+    sessions= burn_disc_get_sessions(disc, &num_sessions);
+    if(sessions==NULL || num_sessions < 1) {
+no_track:;
+      Xorriso_process_msg_queues(xorriso,0);
+      sprintf(xorriso->info_text,"Program error : no track in prepared disc");
+      Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FATAL", 0);
+      {ret= -1; goto ex;}
+    }
+    tracks= burn_session_get_tracks(sessions[0], &num_tracks);
+    if(tracks==NULL || num_tracks < 1)
+      goto no_track;
+    burn_track_define_data(tracks[0], 0, 
+                           (Xorriso_min_track_sizE - img_sectors) * 2048,
+                           0, BURN_MODE1);
+    Xorriso_process_msg_queues(xorriso,0);
+    sprintf(xorriso->info_text, "Expanded track to minimum size of %d sectors",
+            Xorriso_min_track_sizE);
+    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "NOTE", 0);
+ }
+
  isoburn_disc_write(burn_options, disc);
  burn_write_opts_free(burn_options);