Experiment for TOC on overwriteables: Keep a target_head copy of session #1

libisoburn/burn_wrap.c

@@ -213,7 +213,27 @@ int isoburn_libburn_req(int *major, int *minor, int *micro)
 }
 
 
-/** Examine the media and sets appropriate emulation if needed.
+int isoburn_is_intermediate_dvd_rw(struct burn_drive *d, int flag)
+{
+ int profile, ret= 0, format_status, num_formats;
+ char profile_name[80];
+ enum burn_disc_status s;
+ off_t format_size= -1;
+ unsigned bl_sas;
+
+ s= isoburn_disc_get_status(d);
+ ret= burn_disc_get_profile(d, &profile, profile_name);
+ if(ret>0 && profile==0x13)
+   ret= burn_disc_get_formats(d, &format_status, &format_size,
+                              &bl_sas, &num_formats);
+ if(ret>0 && profile==0x13 && s==BURN_DISC_BLANK &&
+    format_status==BURN_FORMAT_IS_UNKNOWN)
+   return(1);
+ return(0);
+}
+
+
+/** Examines the media and sets appropriate emulation if needed.
     @param flag bit0= pretent blank on overwriteable media
 */ 
 static int isoburn_welcome_media(struct isoburn **o, struct burn_drive *d,
@@ -238,9 +258,14 @@ static int isoburn_welcome_media(struct isoburn **o, struct burn_drive *d,
 
  if(caps->start_adr) {         /* set emulation to overwriteable */
    (*o)->emulation_mode= 1;
-
+   ret= isoburn_is_intermediate_dvd_rw(d, 0);
-   if(flag&1) {
+   if(ret>0) {
+     (*o)->min_start_byte= 0;
      (*o)->nwa= 0;
+     (*o)->zero_nwa= 0;
+   }
+   if(flag&1) {
+     (*o)->nwa= (*o)->zero_nwa;
      (*o)->fabricated_disc_status= BURN_DISC_BLANK;
    } else {
      ret= isoburn_start_emulation(*o, 0);
@@ -386,7 +411,7 @@ enum burn_disc_status isoburn_disc_get_status(struct burn_drive *drive)
  /* emulated status */
  if(o->emulation_mode==-1)
    return(BURN_DISC_UNSUITABLE);
- if(o->nwa>0)
+ if(o->nwa>o->zero_nwa)
    return(BURN_DISC_APPENDABLE);
  return(BURN_DISC_BLANK);
 }
@@ -520,6 +545,16 @@ void isoburn_disc_write(struct burn_write_opts *opts, struct burn_disc *disc)
  enum burn_write_types write_type;
  struct stat stbuf;
 
+#ifdef NIX
+ /* <<< now in isoburn_is_intermediate_dvd_rw()
+ */
+ int profile, format_status, num_formats;
+ unsigned bl_sas;
+ off_t format_size= -1;
+ char profile_name[80];
+ enum burn_disc_status s;
+#endif
+
  drive= burn_write_opts_get_drive(opts);
  ret= isoburn_find_emulator(&o, drive, 0);
  if(ret<0)
@@ -529,8 +564,52 @@ void isoburn_disc_write(struct burn_write_opts *opts, struct burn_disc *disc)
    if(o->emulation_mode!=0) {
      burn_write_opts_set_multi(opts, 0);
      if(o->emulation_mode>0 && o->nwa >= 0) {
-       burn_write_opts_set_start_byte(opts, ((off_t) o->nwa) * (off_t) 2048);
        nwa= o->nwa;
+
+       /* This caters for unwritten formatted DVD-RW. They need to be written
+          sequentially on the first use. Only written areas are random access.
+          If the first session is not written to LBA 0, then re-opening of
+          formatting and padding is needed. 
+          This can be done. But when the track gets closed after padding,
+          this lasts a long time. There is a high risk that an app will not
+          poll the message queue while waiting for  isoburn_disc_write()  to
+          return. The pacifier loop usually happens only afterwards.
+          So automatic formatting might cause a nervous clueless user.
+       */
+
+#ifdef NIX
+ /* <<< now in isoburn_is_intermediate_dvd_rw()
+ */
+       s= isoburn_disc_get_status(drive);
+       ret= burn_disc_get_profile(drive, &profile, profile_name);
+       if(ret>0 && profile==0x13)
+         ret= burn_disc_get_formats(drive, &format_status, &format_size,
+                                    &bl_sas, &num_formats);
+       if(ret>0 && profile==0x13 && s==BURN_DISC_BLANK && nwa>0 &&
+          nwa <= o->zero_nwa && format_status==BURN_FORMAT_IS_UNKNOWN) {
+
+#else
+
+       ret= isoburn_is_intermediate_dvd_rw(drive, 0);
+       if(ret>0 && nwa>0 && nwa <= o->zero_nwa) {
+
+#endif /* ! NIX */
+
+         /* actually this should not happen since such media get recognized
+            by isoburn_welcome_media and o->zero_nwa gets set to 0
+         */
+         sprintf(msg,
+        "DVD-RW insufficiently formatted. (Intermediate State, size unknown)");
+         burn_msgs_submit(0x00060000, msg, 0, "FAILURE", NULL);
+         sprintf(msg,
+                "It might help to first deformat it and then format it again");
+         burn_msgs_submit(0x00060000, msg, 0, "HINT", NULL);
+         burn_drive_cancel(drive); /* mark run as failure */
+         return;
+       }
+       /* end of DVD-RW oriented check */
+
+       burn_write_opts_set_start_byte(opts, nwa * (off_t) 2048);
      }
    }
  }
@@ -546,12 +625,11 @@ void isoburn_disc_write(struct burn_write_opts *opts, struct burn_disc *disc)
     return;
  }
 
-/*
  sprintf(reasons, "%d", (int) write_type);
- fprintf(stderr, "isoburn_EXPERIMENTAL: write_type = %s\n",
+ sprintf(msg, "Write_type = %s\n",
               (write_type == BURN_WRITE_SAO ? "SAO" :
               (write_type == BURN_WRITE_TAO ? "TAO" : reasons)));
-*/
+ burn_msgs_submit(0x00060000, msg, 0, "DEBUG", NULL);
 
 #ifdef Hardcoded_cd_rW
  /* <<< A70929 : hardcoded CD-RW with fabricated -msinfo */
@@ -638,9 +716,10 @@ int isoburn_set_start_byte(struct isoburn *o, off_t value, int flag)
  if(value % caps->start_alignment)
    value+= caps->start_alignment - (value % caps->start_alignment);
  o->nwa= value/2048;
- /* If suitable for alignment, round up to full 16 sector addresses */
+ /* If suitable for media alignment, round up to Libisoburn_nwa_alignemenT */
- if((o->nwa%16) && ((16*2048) % caps->start_alignment)==0 )
+ if((o->nwa % Libisoburn_nwa_alignemenT) &&
-   o->nwa+= 16 - (o->nwa%16);
+     ((Libisoburn_nwa_alignemenT*2048) % caps->start_alignment)==0 )
+   o->nwa+= Libisoburn_nwa_alignemenT - (o->nwa % Libisoburn_nwa_alignemenT);
  ret= 1;
 ex:
  if(caps!=NULL)

libisoburn/isoburn.c

@@ -42,6 +42,51 @@
 #include "../version.h"
 */
 
+/* ----------------------- isoburn_toc_entry  ---------------------- */
+
+
+int isoburn_toc_entry_new(struct isoburn_toc_entry **objpt,
+                          struct isoburn_toc_entry *boss, int flag)
+{
+ struct isoburn_toc_entry *o, *s;
+
+ *objpt= o= (struct isoburn_toc_entry *)
+            malloc(sizeof(struct isoburn_toc_entry));
+ if(o==NULL) {
+   burn_msgs_submit(0x00060000,
+                    "Cannot allocate memory for isoburn toc entry",
+                    0, "FATAL", NULL);
+   return(-1);
+ }
+ o->session= 0;
+ o->track_no= 0;
+ o->start_lba= -1;
+ o->track_blocks= 0;
+ o->next= NULL;
+ if(boss!=NULL) {
+   for(s= boss; s->next!=NULL; s= s->next);
+   s->next= o;
+ }
+ return(1);
+}
+
+
+/* @param flag bit0= delete all subordinates too
+*/
+int isoburn_toc_entry_destroy(struct isoburn_toc_entry **o, int flag)
+{
+ if(*o==NULL)
+   return(0);
+ if(flag&1)
+   isoburn_toc_entry_destroy(&((*o)->next), flag);
+ free((char *) (*o));   
+ *o= NULL;
+ return(1);
+}
+
+
+/* --------------------- end isoburn_toc_entry  -------------------- */
+
 /* --------------------------  isoburn  ----------------------- */
 
 
@@ -67,8 +112,9 @@ int isoburn_new(struct isoburn **objpt, int flag)
 
  o->drive= NULL;
  o->emulation_mode= 0;
- o->min_start_byte= 0;
+ o->zero_nwa= Libisoburn_overwriteable_starT;
- o->nwa= 0;
+ o->min_start_byte= o->zero_nwa * 2048;
+ o->nwa= o->zero_nwa;
  o->truncate= 0;
 
 #ifdef Libisoburn_no_fifO
@@ -77,8 +123,9 @@ int isoburn_new(struct isoburn **objpt, int flag)
  o->fifo= NULL;
 #endif
 
- o->wrote_well= -1;
  o->fabricated_disc_status= BURN_DISC_UNREADY;
+ o->toc= NULL;
+ o->wrote_well= -1;
  for(i=0;i<65536;i++)
    o->target_iso_head[i]= 0;
  o->image= NULL;
@@ -121,6 +168,8 @@ int isoburn_destroy(struct isoburn **objpt, int flag)
  if(o->image!=NULL)
    iso_image_unref(o->image);
 
+ if(o->toc!=NULL)
+   isoburn_toc_entry_destroy(&(o->toc), 1); /* all */
 #ifdef Libisoburn_no_fifO
  if(o->iso_source!=NULL)
    burn_source_free(o->iso_source);
@@ -339,8 +388,9 @@ int isoburn_prepare_disc_aux(struct burn_drive *d, struct burn_disc **disc,
    }
    if (nwa == 0 && state == BURN_DISC_APPENDABLE) {
      /* invalid nwa */
-     burn_msgs_submit(0x00060000, "Encountered 0 as next writeable address", 0,
+     burn_msgs_submit(0x00060000,
-                      "FAILURE", NULL);
+                      "Encountered 0 as next writeable address of appendable",
+                      0, "FAILURE", NULL);
      {ret= -4; goto ex;}
    }
    iso_write_opts_set_ms_block(wopts, nwa);

libisoburn/isoburn.h

@@ -17,6 +17,18 @@
 /* for uint8_t */
 #include <stdint.h>
 
+/* For emulated TOC of overwriteable media.
+   Provides minimal info for faking a struct burn_toc_entry.
+*/
+struct isoburn_toc_entry {
+ int session;
+ int track_no; /* point */
+ int start_lba;
+ int track_blocks;
+
+ struct isoburn_toc_entry *next;
+};
+
 
 struct isoburn {
 
@@ -36,6 +48,11 @@ struct isoburn {
  struct isoburn *next;
 
 
+ /* The nwa to be used for a first session on the present kind of overwriteable
+    media (usually Libisoburn_overwriteable_starT, but might be forced to 0)
+  */
+ int zero_nwa;
+
  /* Start address as given by image examination (bytes, not blocks) */
  off_t min_start_byte;
 
@@ -51,6 +68,11 @@ struct isoburn {
  */
  enum burn_disc_status fabricated_disc_status;
 
+ /* Eventual emulated table of content read from the chain of ISO headers
+    on overwriteable media.
+ */ 
+ struct isoburn_toc_entry *toc;
+
 #ifndef Libisoburn_no_fifO
  /* The fifo which is installed between track and libisofs burn_source
  */
@@ -328,5 +350,34 @@ struct isoburn_imgen_opts {
     int effective_lba;
 };
 
+
+/* Alignment for session starts on overwriteable media.
+   (Increased from 16 to 32 blocks for aligning to BD-RE clusters.)
+*/
+#define Libisoburn_nwa_alignemenT 32
+
+/* Size of target_iso_head which is to be written during
+   isoburn_activate_session()
+*/
+#define Libisoburn_target_head_sizE (32*2048)
+
+/* >>> Experiment to create a chain of image headers which form a TOC:
+
+   The header of the first session is written after the LBA 0 header.
+   So it persists and can give the end of its session. By help of
+   Libisoburn_nwa_alignemenT it should be possible to predict the start
+   of the next session header.
+   The LBA 0 header is written by isoburn_activate_session() already
+   with the first session. So the media is mountable.
+   A problem arises with DVD-RW in Intermediate State. They cannot be
+   written by random access before they were written sequentially.
+   In this case, no copy of the session  1 header is maintained and no TOC
+   will be possible. Thus writing begins sequentially at LBA 0.
+*/
+#define Libisoburn_overwriteable_starT \
+                                   ((off_t) (Libisoburn_target_head_sizE/2048))
+
+
+
 #endif /* Isoburn_includeD */
 

libisoburn/isofs_wrap.c

@@ -26,7 +26,6 @@
 
 #endif /* Xorriso_standalonE */
 
-
 #include "isoburn.h"
 #include "libisoburn.h"
 
@@ -281,11 +280,13 @@ int isoburn_activate_session(struct burn_drive *drive)
  if (o->emulation_mode != 1)
    return 1; /* don't need to activate session */
  
- if (o->fabricated_disc_status != BURN_DISC_APPENDABLE)
+ if (!(o->fabricated_disc_status == BURN_DISC_APPENDABLE ||
+       (o->fabricated_disc_status == BURN_DISC_BLANK &&
+        o->zero_nwa > 0)))
    return 1;
  
  ret = burn_random_access_write(drive, 0, (char*)o->target_iso_head, 
-                                32*2048, 1);
+                                Libisoburn_target_head_sizE, 1);
 
  return ret;
 }
@@ -356,7 +357,7 @@ int isoburn_start_emulation(struct isoburn *o, int flag)
  } else if (!strncmp((char*)pvm->std_identifier, "CDXX1", 5)) {
 
    /* empty image */
-   isoburn_set_start_byte(o, (off_t) 0, 0);
+   isoburn_set_start_byte(o, o->zero_nwa * 2048, 0);
    o->fabricated_disc_status= BURN_DISC_BLANK;
  } else {
    /* treat any disc in an unknown format as full */

xorriso/xorriso_timestamp.h

@@ -1 +1 @@
-#define Xorriso_timestamP "2008.05.06.084439"
+#define Xorriso_timestamP "2008.05.06.144606"