diff --git a/libisoburn/trunk/xorriso/xorriso.1 b/libisoburn/trunk/xorriso/xorriso.1
index 0a65ac26..056e7297 100644
--- a/libisoburn/trunk/xorriso/xorriso.1
+++ b/libisoburn/trunk/xorriso/xorriso.1
@@ -590,8 +590,8 @@ inherited from cp -r behavior. Its syntax resembles cp, though.
 Map a byte interval of a regular disk file into a regular file in the ISO
 image.
 This may be necessary if the disk file is larger than a single media, or if
-it exceeds the traditional limit of 2 GiB - 2 kiB for old operating systems,
-or the limit of 4 GiB - 2 kiB for newer ones.
+it exceeds the traditional limit of 2 GiB - 1 for old operating systems,
+or the limit of 4 GiB - 1 for newer ones.
 .br
 A clumsy remedy for this limit is to backup file pieces and to concatenate
 them at restore time. A well tested chopping size is 2047m.
@@ -621,7 +621,7 @@ A disk file gets mapped to an ISO directory containing its split parts
 as regular files. The parts have names which describe the splitting
 by 5 numbers which are separated by some non-numerical text:
 .br
-part_number, total_parts, byte_offset, byte_count, disk_path_size
+part_number, total_parts, byte_offset, byte_count, disk_file_size
 .br
 Scaling characters like "m" or "k" are taken into respect and may
 serve as separators as well. All digits are interpreted as decimal,
@@ -988,6 +988,16 @@ existing file types get treated with -rm before the new file gets added.
 Setting "on" allows automatic -rm_r. I.e. a non-directory can replace an
 existing directory and all its subordinates.
 .TP
+\fB\-split_size\fR number["k"|"m"]
+Set the threshold for automatic splitting of regular files. Such splitting
+maps a large disk file onto a ISO directory with several part files in it.
+This is necessary if the size of the disk file exceeds 4 GiB - 1.
+Older operating systems can handle files only if they are 2 GiB - 1.
+See also option -cut_out for more information about file parts.
+.br
+Default is 0 which will exclude files >= 4 GiB by a FAILURE event.
+A well tested -split_size is 2047m. Sizes of 4 GiB or more are not permissible.
+.TP                
 .B Settings for result writing:
 .TP
 Rock Ridge info will be generated by the program unconditionally.
diff --git a/libisoburn/trunk/xorriso/xorriso.c b/libisoburn/trunk/xorriso/xorriso.c
index 7b245666..a954b35d 100644
--- a/libisoburn/trunk/xorriso/xorriso.c
+++ b/libisoburn/trunk/xorriso/xorriso.c
@@ -2960,6 +2960,7 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  strcpy(m->wdx, m->initial_wdx);
  m->did_something_useful= 0;
  m->add_plainly= 0;
+ m->split_size= 0;
  m->do_joliet= 0;
  m->do_follow_pattern= 1;
  m->do_follow_param= 0;
@@ -4152,6 +4153,18 @@ int Xorriso_status(struct XorrisO *xorriso, char *filter, FILE *fp, int flag)
          (xorriso->wdx[0] ? Text_shellsafe(xorriso->wdx,sfe,0) : "'/'"));
  Xorriso_status_result(xorriso,filter,fp,flag&2);
 
+ is_default= (xorriso->split_size==0);
+ strcpy(line,"-split_size ");
+ if(xorriso->split_size % (1024*1024) || xorriso->split_size==0) {
+   Sfile_off_t_text(line+strlen(line), xorriso->split_size, 0);
+ } else {
+   Sfile_off_t_text(line+strlen(line), xorriso->split_size / (1024*1024), 0);
+   strcat(line, "m");
+ }
+ strcat(line, "\n");
+ if(!(is_default && no_defaults))
+   Xorriso_status_result(xorriso,filter,fp,flag&2);
+
  is_default= (xorriso->add_plainly==0);
  sprintf(line,"-add_plainly %s\n",
          (xorriso->add_plainly == 1 ? "unknown" : 
@@ -4679,7 +4692,7 @@ int Xorriso_compare_2_files(struct XorrisO *xorriso, char *disk_adr,
 
  /* Splitfile parts */
  if((S_ISREG(s1.st_mode) || S_ISBLK(s1.st_mode)) && S_ISDIR(s2.st_mode)) {
-   is_split= Xorriso_identify_split(xorriso, iso_adr, &split_parts,
+   is_split= Xorriso_identify_split(xorriso, iso_adr, NULL, &split_parts,
                                     &split_count, &s2, 0);
    if(is_split>0)
      (*result)|= (1<<17);
@@ -7620,9 +7633,6 @@ int Xorriso_update_interpreter(struct XorrisO *xorriso, void *boss_iter,
 
  if(compare_result&(8|64)) {
    /* file type, minor+major with device file */
-
-   /* <<< ??? SPLIT : cannot happen here ??? really ? */
-
    ret= Xorriso_rmi(xorriso, boss_iter, (off_t) 0, iso_rr_path, 1); /* rm_r */
    if(ret>0) {
      deleted= 1; 
@@ -7643,8 +7653,7 @@ delete:;
       content bytes differ */
 
    if(is_split) {
-     /* >>> SPLIT : differing content or size */;
-     ret= Xorriso_identify_split(xorriso, iso_rr_path,
+     ret= Xorriso_identify_split(xorriso, iso_rr_path, NULL,
                                  &split_parts, &split_count, &stbuf, 0);
      if(ret<=0)
        {ret= -1; goto ex;}  /* (should not happen) */
@@ -7709,7 +7718,7 @@ delete:;
    /* access permissions, user id, group id, mtime, atime, ctime */
 
    if(is_split) {
-     ret= Xorriso_identify_split(xorriso, iso_rr_path,
+     ret= Xorriso_identify_split(xorriso, iso_rr_path, NULL,
                                  &split_parts, &split_count, &stbuf, 0);
      if(ret<=0)
        {ret= -1; goto ex;}  /* (should not happen) */
@@ -8637,7 +8646,6 @@ ex:;
 
 
 /* SPLIT : proposed target format
-
    part_{partno}_of_{total_parts}_at_{offset}_with_{bytes}_of_{total_bytes}
 */
 
@@ -10554,6 +10562,25 @@ dvd_speed:;
 }
 
 
+/* Option -split_size */
+int Xorriso_option_split_size(struct XorrisO *xorriso, char *size, int flag)
+{
+ double num;
+ static off_t limit= ((off_t) 4) * ((off_t) 1024*1024*1024) - (off_t) 1;
+
+ num= Scanf_io_size(size, 0);
+ if(num > limit) {
+   sprintf(xorriso->info_text, "-split_size: too large %.f (allowed: %.f)",
+           num, (double) limit);
+   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
+   return(0);
+ } else if(num < 0)
+   num= 0.0;
+ xorriso->split_size= num;
+ return(1);
+}
+
+
 /* Option -status */
 int Xorriso_option_status(struct XorrisO *xorriso, char *mode, int flag)
 {
@@ -11220,6 +11247,10 @@ next_command:;
    (*idx)++;
    ret= Xorriso_option_speed(xorriso, arg1, 0);
 
+ } else if(strcmp(cmd,"split_size")==0) {
+   (*idx)++;
+   ret= Xorriso_option_split_size(xorriso, arg1, 0);
+
  } else if(strcmp(cmd,"status")==0) {
    (*idx)++;
    ret= Xorriso_option_status(xorriso, arg1, 0);
diff --git a/libisoburn/trunk/xorriso/xorriso.h b/libisoburn/trunk/xorriso/xorriso.h
index 44cf9aae..ddc0c29c 100644
--- a/libisoburn/trunk/xorriso/xorriso.h
+++ b/libisoburn/trunk/xorriso/xorriso.h
@@ -406,6 +406,9 @@ int Xorriso_option_rollback(struct XorrisO *xorriso, int flag);
 /* Option -speed */
 int Xorriso_option_speed(struct XorrisO *xorriso, char *speed, int flag);
 
+/* Option -split_size */
+int Xorriso_option_split_size(struct XorrisO *xorriso, char *s, int flag);
+
 /* Option -status */
 int Xorriso_option_status(struct XorrisO *xorriso, char *mode, int flag);
 
diff --git a/libisoburn/trunk/xorriso/xorriso_private.h b/libisoburn/trunk/xorriso/xorriso_private.h
index 3c3e6b9d..caa388f3 100644
--- a/libisoburn/trunk/xorriso/xorriso_private.h
+++ b/libisoburn/trunk/xorriso/xorriso_private.h
@@ -77,6 +77,7 @@ struct XorrisO { /* the global context of xorriso */
  int did_something_useful;
 
  int add_plainly;
+ off_t split_size;
 
  /* >>> put libisofs aspects here <<< */
 
@@ -444,5 +445,9 @@ int Splitparts_get(struct SplitparT *o, int idx, char **name, int *partno,
 int Splitpart__parse(char *name, int *partno, int *total_parts,
                     off_t *offset, off_t *bytes, off_t *total_bytes, int flag);
 
+int Splitpart__compose(char *adr, int partno, int total_parts,
+                       off_t offset, off_t bytes, off_t total_bytes, int flag);
+
+
 #endif /* Xorriso_private_includeD */
 
diff --git a/libisoburn/trunk/xorriso/xorriso_timestamp.h b/libisoburn/trunk/xorriso/xorriso_timestamp.h
index 5e9762f1..c91c8a77 100644
--- a/libisoburn/trunk/xorriso/xorriso_timestamp.h
+++ b/libisoburn/trunk/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2008.03.27.103344"
+#define Xorriso_timestamP "2008.03.29.164038"
diff --git a/libisoburn/trunk/xorriso/xorrisoburn.c b/libisoburn/trunk/xorriso/xorrisoburn.c
index a3d37f6d..a490e0d8 100644
--- a/libisoburn/trunk/xorriso/xorrisoburn.c
+++ b/libisoburn/trunk/xorriso/xorrisoburn.c
@@ -56,12 +56,20 @@
 
 #endif /* Xorriso_standalonE */
 
-
+/* Some private in advance declarations */
 int  Xorriso_pacifier_loop(struct XorrisO *xorriso, struct burn_drive *drive,
                           int flag);
 
 int Xorriso__read_pacifier(IsoImage *image, IsoFileSource *filesource);
 
+int Xorriso_tree_graft_node(struct XorrisO *xorriso, IsoImage *volume,
+                            IsoDir *dir, char *disk_path, char *img_name,
+                            char *nominal_source, char *nominal_target,
+                            off_t offset, off_t cut_size,
+                            IsoNode **node, int flag);
+
+int Xorriso_is_split(struct XorrisO *xorriso, IsoNode *node, int flag);
+
 
 #define LIBISO_ISDIR(node) (iso_node_get_type(node) == LIBISO_DIR)
 #define LIBISO_ISREG(node) (iso_node_get_type(node) == LIBISO_FILE)
@@ -1384,6 +1392,45 @@ int Xorriso_transfer_properties(struct XorrisO *xorriso, struct stat *stbuf,
 }
 
 
+int Xorriso_graft_split(struct XorrisO *xorriso, IsoImage *volume,
+                        IsoDir *dir, char *disk_path, char *img_name,
+                        char *nominal_source, char *nominal_target,
+                        off_t size, IsoNode **node, int flag)
+{
+ int ret;
+ IsoDir *new_dir= NULL;
+ IsoNode *part_node;
+ int partno, total_parts;
+ off_t offset;
+ char part_name[SfileadrL], sfe[5*SfileadrL];
+
+ ret= iso_tree_add_new_dir(dir, img_name, &new_dir);
+ if(ret<0)
+   return(ret);
+ *node= (IsoNode *) new_dir;
+
+ total_parts= size / xorriso->split_size;
+ if(size % xorriso->split_size)
+   total_parts++;
+ for(partno= 1; partno<=total_parts; partno++) {
+   offset = xorriso->split_size * (off_t) (partno-1);
+   Splitpart__compose(part_name, partno, total_parts, offset,
+                      xorriso->split_size, size, 0);
+   ret= Xorriso_tree_graft_node(xorriso, volume,
+                                new_dir, disk_path, part_name,
+                                nominal_source, nominal_target,
+                                offset, xorriso->split_size,
+                                &part_node, 8);
+   if(ret<=0)
+     return(0);
+ }
+ sprintf(xorriso->info_text, "Split into %d parts: %s",
+         total_parts, Text_shellsafe(nominal_target, sfe, 0));
+ Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "NOTE", 0);
+ return(1);
+}
+
+
 /* 
    @param flag bit3= cut_out_node: offset and size are valid
 */
@@ -1394,13 +1441,48 @@ int Xorriso_tree_graft_node(struct XorrisO *xorriso, IsoImage *volume,
                             IsoNode **node, int flag)
 {
  int ret;
+ struct stat stbuf;
+ char sfe[5*SfileadrL];
+ off_t size= 0;
+ static off_t limit= ((off_t) 4) * ((off_t) 1024*1024*1024) - (off_t) 1;
 
- if(flag&8) 
+ if(flag&8)  {
+   if(cut_size > limit) {
+     sprintf(xorriso->info_text,
+             "File piece exceeds size limit of %.f bytes: %.f from %s\n",
+             (double) limit, (double) cut_size,
+             Text_shellsafe(disk_path, sfe, 0));
+     Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
+     return(0);
+   }
    ret= iso_tree_add_new_cut_out_node(volume, dir, img_name, disk_path,
                                       offset, cut_size, node);
- else
-   ret= iso_tree_add_new_node(volume, dir, img_name, disk_path, node);
+   if(ret<0)
+     goto ex;
+ } else {
 
+   if(stat(disk_path, &stbuf)!=-1)
+     if(S_ISREG(stbuf.st_mode))
+       size= stbuf.st_size;
+   if(xorriso->split_size > 0 && size > xorriso->split_size) {
+     ret= Xorriso_graft_split(xorriso, volume, dir, disk_path, img_name,
+                              nominal_source, nominal_target, size,
+                              node, 0);
+     if(ret<=0)
+       goto ex;
+     return(1);
+   } else if(size > limit) {
+     sprintf(xorriso->info_text,
+             "File exceeds size limit of %.f bytes: %s\n",
+             (double) limit, Text_shellsafe(disk_path, sfe, 0));
+     Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
+     return(0);
+   }
+   ret= iso_tree_add_new_node(volume, dir, img_name, disk_path, node);
+   if(ret<0)
+     goto ex;
+ }
+ex:;
  if(ret<0) {
    Xorriso_process_msg_queues(xorriso,0);
    Xorriso_report_iso_error(xorriso, nominal_source, ret,
@@ -1422,7 +1504,7 @@ int Xorriso_add_tree(struct XorrisO *xorriso, IsoDir *dir,
  IsoNode *node;
  IsoSymlink *iso_symlink;
  int ret, target_is_dir, source_is_dir, source_is_link, fret, was_failure= 0;
- int do_not_dive;
+ int do_not_dive, target_is_split= 0;
  struct DirseQ *dirseq= NULL;
  char *name, *img_name, *srcpt, *stbuf_src= "";
  struct stat stbuf, hstbuf;
@@ -1561,12 +1643,16 @@ cannot_lstat:;
    ret= Xorriso_node_from_path(xorriso, volume, img_path, &node, 1);
    if(ret>0) {
      target_is_dir= LIBISO_ISDIR(node);
-     if(!(target_is_dir && source_is_dir)) {
+     target_is_split= 0;
+     if(target_is_dir)
+       target_is_split= Xorriso_is_split(xorriso, node, 0);
+
+     if(!((target_is_dir && !target_is_split) && source_is_dir)) {
        Xorriso_process_msg_queues(xorriso,0);
 
        /* handle overwrite situation */;
        if(xorriso->do_overwrite==1 ||
-          (xorriso->do_overwrite==2 && !target_is_dir)) {
+          (xorriso->do_overwrite==2 && !(target_is_dir && !target_is_split))) {
          ret= Xorriso_rmi(xorriso, NULL, (off_t) 0, img_path, 1|8);
          if(ret<=0)
            goto was_problem;
@@ -1778,6 +1864,7 @@ int Xorriso_graft_in(struct XorrisO *xorriso, void *boss_iter,
  IsoDir *dir, *hdir;
  IsoNode *node;
  int done= 0, is_dir= 0, l, ret, target_is_dir, source_is_dir, resolve_link= 0;
+ int target_is_split;
  struct stat stbuf;
 
  for(cpt= img_path; 1; cpt++) {
@@ -1880,12 +1967,17 @@ int Xorriso_graft_in(struct XorrisO *xorriso, void *boss_iter,
    ret= Xorriso_node_from_path(xorriso, volume, path, &node, 1);
    if(ret>0) {
      target_is_dir= LIBISO_ISDIR(node);
-     if(!(target_is_dir && source_is_dir)) {
+
+     target_is_split= 0;
+     if(target_is_dir) 
+       target_is_split= Xorriso_is_split(xorriso, node, 0);
+
+     if(!((target_is_dir && !target_is_split) && source_is_dir)) {
        Xorriso_process_msg_queues(xorriso,0);
 
        /* handle overwrite situation */;
        if(xorriso->do_overwrite==1 ||
-          (xorriso->do_overwrite==2 && !target_is_dir)) {
+          (xorriso->do_overwrite==2 && !(target_is_dir && !target_is_split))) {
          ret= Xorriso_rmi(xorriso, boss_iter, (off_t) 0, path, 1|8);
          if(ret<=0)
            return(ret);
@@ -4692,13 +4784,17 @@ int Xorriso_iso_file_close(struct XorrisO *xorriso, void **stream, int flag)
 }
 
 
+/* @param flag bit0= in_node is valid, do not resolve iso_adr
+*/
 int Xorriso_identify_split(struct XorrisO *xorriso, char *iso_adr,
+                           void *in_node,
                            struct SplitparT **parts, int *count,
                            struct stat *total_stbuf,  int flag)
 {
  int ret, i;
  int partno, total_parts, first_total_parts= -1;
- off_t offset, bytes, total_bytes, first_total_bytes= -1, first_bytes, size;
+ off_t offset, bytes, total_bytes, first_total_bytes= -1, first_bytes= -1;
+ off_t size;
  IsoImage *volume;
  IsoDir *dir_node;
  IsoDirIter *iter= NULL;
@@ -4709,12 +4805,16 @@ int Xorriso_identify_split(struct XorrisO *xorriso, char *iso_adr,
  *count= 0;
  *parts= NULL;
 
- ret= Xorriso_get_volume(xorriso, &volume, 0);
- if(ret<=0)
-   return(-1);
- ret= Xorriso_node_from_path(xorriso, volume, iso_adr, &node, 1);
- if(ret<=0)
-   return(-1);
+ if(flag&1) {
+   node= (IsoNode *) in_node;
+ } else {
+   ret= Xorriso_get_volume(xorriso, &volume, 0);
+   if(ret<=0)
+     return(-1);
+   ret= Xorriso_node_from_path(xorriso, volume, iso_adr, &node, 1);
+   if(ret<=0)
+     return(-1);
+ }
  if(!LIBISO_ISDIR(node))
    return(0);
  dir_node= (IsoDir *) node;
@@ -4797,3 +4897,17 @@ ex:;
  return(ret);
 }
 
+
+int Xorriso_is_split(struct XorrisO *xorriso, IsoNode *node, int flag)
+{
+ struct SplitparT *split_parts= NULL;
+ int split_count= 0, ret;
+ struct stat stbuf;
+
+ ret= Xorriso_identify_split(xorriso, "", (void *) node, &split_parts,
+                             &split_count, &stbuf, 1);
+ if(split_parts!=NULL)
+   Splitparts_destroy(&split_parts, split_count, 0);
+ return(ret>0);
+}
+
diff --git a/libisoburn/trunk/xorriso/xorrisoburn.h b/libisoburn/trunk/xorriso/xorrisoburn.h
index 2a58a314..9a28a4ca 100644
--- a/libisoburn/trunk/xorriso/xorrisoburn.h
+++ b/libisoburn/trunk/xorriso/xorrisoburn.h
@@ -197,7 +197,10 @@ int Xorriso_cut_out(struct XorrisO *xorriso, char *disk_path,
 
 struct SplitparT;
 
+/* @param flag bit0= in_node is valid, do not resolve iso_adr
+*/
 int Xorriso_identify_split(struct XorrisO *xorriso, char *iso_adr,
+                           void *in_node,
                            struct SplitparT **parts, int *count,
                            struct stat *total_stbuf, int flag);