Enhanced option -extract_cut for handling filtered files

libisoburn/trunk/xorriso/xorriso.1

@@ -2,7 +2,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH XORRISO 1 "May 09, 2009"
+.TH XORRISO 1 "May 14, 2009"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -1138,7 +1138,7 @@ Examples:
 .br
                   /usr/bin/bzip2 --
 .br
- -external_filter bunzip2 suffix=.bz2:remove_suffix:if_nonempty \\
+ -external_filter bunzip2 suffix=.bz2:remove_suffix \\
 .br
                   /usr/bin/bunzip2 --
 .TP
@@ -2131,7 +2131,8 @@ With occasion "file_extraction" there are three behaviors:
 .br
 "delete" removes files which encountered errors during content extraction.
 .br
-"best_effort" starts a revovery attempt by means of -extract_cut.
+"best_effort" starts a revovery attempt by means of -extract_cut if the
+file content stems from the loaded ISO image and is not filtered.
 .TP
 .B Dialog mode control:
 .TP
@@ -2633,17 +2634,15 @@ composed from iso_rr_path by replacing iso_rr_prefix by disk_prefix.
 \fB\-extract_cut\fR iso_rr_path byte_offset byte_count disk_path
 Copy a byte interval from a data file out of an ISO image into a newly created
 disk file.
-Two restrictions apply:
+The main purpose for this is to allow handling of large files if they
+are not supported by mount -t iso9660 and if the reading system is unable
+to buffer them as a whole.
 .br
-The data bytes of iso_rr_path need to be already stored in the loaded ISO image
+If the data bytes of iso_rr_path are stored in the loaded ISO image,
-and byte_offset must be a multiple of 2048, e.g. an integer with suffix
+and no filter is applied,
-s, m, or g.
+and byte_offset is a multiple of 2048, then a special run of -check_media
-.br
+is performed. It may be quicker and more rugged than the general reading
-This option is implemented by a special run of -check_media and governed by
+method.
-most of the options which can be set by -check_media_defaults.
-Its main purpose is to allow handling of large files if they are not supported
-by mount -t iso9660 and if the reading system is unable to buffer them as
-a whole.
 .TP
 \fB\-cpx\fR iso_rr_path [***] disk_path
 Extract single leaf file objects from the ISO image and store them under

libisoburn/trunk/xorriso/xorriso.c

@@ -14693,8 +14693,8 @@ int Xorriso_option_extract_cut(struct XorrisO *xorriso, char *iso_rr_path,
  bytecount= num;
  sprintf(xorriso->info_text, 
          "-extract_cut from %s , byte %.f to %.f, and store as %s",
-         disk_path, (double) startbyte, (double) (startbyte+bytecount),
+         iso_rr_path, (double) startbyte, (double) (startbyte+bytecount),
-         iso_rr_path);
+         disk_path);
  Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "DEBUG", 0);
 
  ret= Xorriso_extract_cut(xorriso, iso_rr_path, disk_path,

libisoburn/trunk/xorriso/xorriso_timestamp.h

@@ -1 +1 @@
-#define Xorriso_timestamP "2009.05.09.201742"
+#define Xorriso_timestamP "2009.05.14.082045"

libisoburn/trunk/xorriso/xorrisoburn.c

@@ -3159,8 +3159,25 @@ int Xorriso_restore_implicit_properties(struct XorrisO *xorriso,
 }
 
 
+int Xorriso_is_plain_image_file(struct XorrisO *xorriso, IsoNode *node,
+                                int flag)
+{
+ int ret, lba;
+ IsoStream *stream;
+
+ ret= Xorriso__file_start_lba(node, &lba, 0);
+ if(ret > 0) { /* Stream source is from loaded image */
+   stream= iso_file_get_stream((IsoFile *) node);
+   if(stream != NULL)
+     if(iso_stream_get_input_stream(stream, 0) == NULL)
+       return(1);
+ }
+ return(0);
+}
+
+
 /* @param flag bit0= Minimal transfer: access permissions only
-               bit1= offset and bytes is valid for writing to regular file
+               bit1= *_offset and bytes are valid for writing to regular file
                bit2= This is not a parameter. Do not report if ignored
                bit3= do not restore properties
                bit4= issue pacifier messages with long lasting copying
@@ -3168,15 +3185,16 @@ int Xorriso_restore_implicit_properties(struct XorrisO *xorriso,
            2 regularly not installed (disallowed device, UNIX domain socket)
 */
 int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
-                              char *img_path, char *disk_path,
+                              char *img_path, off_t img_offset,
-                              off_t offset, off_t bytes, int flag)
+                              char *disk_path, off_t disk_offset, off_t bytes,
+                              int flag)
 {
  int ret= 0, write_fd= -1, wanted, wret, open_flags, l_errno= 0;
  int target_deleted= 0;
  char *what= "[unknown filetype]", sfe[5*SfileadrL], sfe2[5*SfileadrL];
- char buf[32*1024], type_text[5], temp_path[SfileadrL];
+ char buf[32*1024], type_text[5], temp_path[SfileadrL], *buf_pt;
  char *link_target, *open_path_pt= NULL;
- off_t todo= 0, size, seek_ret, last_p_count= 0, already_done;
+ off_t todo= 0, size, seek_ret, last_p_count= 0, already_done, read_count= 0;
  void *data_stream= NULL;
  mode_t mode;
  dev_t dev= 0;
@@ -3228,7 +3246,7 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
    }
    if(write_fd==-1) {
      open_flags= O_WRONLY|O_CREAT;
-     if(offset==0 || !(flag&2))
+     if(disk_offset==0 || !(flag&2))
        open_flags|= O_EXCL;
      write_fd= open(open_path_pt, open_flags, S_IRUSR|S_IWUSR);
      l_errno= errno;
@@ -3239,12 +3257,12 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
    if(flag&2) {
      if(bytes<size)
        todo= size= bytes;
-     seek_ret= lseek(write_fd, offset, SEEK_SET);
+     seek_ret= lseek(write_fd, disk_offset, SEEK_SET);
      l_errno= errno;
      if(seek_ret == -1) {
        sprintf(xorriso->info_text,
                "Cannot address byte %.f in filesystem path %s",
-               (double) offset, Text_shellsafe(open_path_pt, sfe, 0));
+               (double) disk_offset, Text_shellsafe(open_path_pt, sfe, 0));
        Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE",0);
        goto cannot_restore;
      }
@@ -3255,7 +3273,8 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
        wanted= todo;
      ret= Xorriso_iso_file_read(xorriso, data_stream, buf, wanted, 0);
      if(ret<=0) {
-       if(xorriso->extract_error_mode == 0) {
+       if(xorriso->extract_error_mode == 0 &&
+          Xorriso_is_plain_image_file(xorriso, node, 0)) {
          close(write_fd);
          write_fd= -1;
          already_done= (size - todo) / (off_t) 2048;
@@ -3280,7 +3299,18 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
        }
    break;
      }
-     wret= write(write_fd, buf, ret);
+     read_count+= ret;
+     buf_pt= buf;
+
+     if(img_offset > read_count - ret) {
+       /* skip the desired amount of bytes */
+       if(read_count <= img_offset)
+   continue;
+       buf_pt= buf + (img_offset - (read_count - ret));
+       ret= read_count - img_offset;
+     }
+
+     wret= write(write_fd, buf_pt, ret);
      if(wret>=0) {
        todo-= wret;
        xorriso->pacifier_byte_count+= wret;
@@ -3509,8 +3539,8 @@ int Xorriso_restore_disk_object(struct XorrisO *xorriso,
        first_part_node= part_node;
      if(offset+bytes>total_bytes)
              bytes= total_bytes-offset;
-     ret= Xorriso_tree_restore_node(xorriso, part_node, part_path, disk_path,
+     ret= Xorriso_tree_restore_node(xorriso, part_node, part_path, (off_t) 0,
-                         offset, bytes,
+                         disk_path, offset, bytes,
                          (!!(flag&64)) | 2 | (flag&4) | 8 | ( 16 * !(flag&2)));
      if(ret<=0)
        goto restoring_failed;
@@ -3534,8 +3564,8 @@ int Xorriso_restore_disk_object(struct XorrisO *xorriso,
 
    img_path_pt= img_path;
 
- ret= Xorriso_tree_restore_node(xorriso, node, img_path_pt, disk_path,
+ ret= Xorriso_tree_restore_node(xorriso, node, img_path_pt, (off_t) 0,
-             offset, bytes,
+             disk_path, offset, bytes,
              (flag&(4|8)) | (!!(flag&64)) | ((flag&1)<<1) | ( 16 * !(flag&2)));
  if(ret>0 && (flag&8))
    ret= Xorriso_restore_properties(xorriso, disk_path, node, 2 | !!(flag&64));
@@ -7848,6 +7878,12 @@ int Xorriso_iso_file_open(struct XorrisO *xorriso, char *pathname,
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
    return(0);
  }
+ if(!iso_stream_is_repeatable(iso_stream)) {
+   sprintf(xorriso->info_text,
+           "The data production of the file in the image is one-time only");
+   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
+   return(0);
+ }
  ret= iso_stream_open(iso_stream);
  if(ret<0) {
    sprintf(xorriso->info_text,
@@ -7855,13 +7891,6 @@ int Xorriso_iso_file_open(struct XorrisO *xorriso, char *pathname,
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
    return(0);
  }
- if(!iso_stream_is_repeatable(iso_stream)) {
-   sprintf(xorriso->info_text,
-           "The data production of the file in the image is one-time only");
-   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
-   iso_stream_close(iso_stream);
-   return(0);
- }
  Xorriso_process_msg_queues(xorriso,0);
  *stream= iso_stream;
 
@@ -8669,9 +8698,9 @@ int Xorriso_extract_cut(struct XorrisO *xorriso,
                         char *img_path, char *disk_path,
                         off_t img_offset, off_t bytes, int flag)
 {
- int ret, stbuf_ret;
+ int ret, stbuf_ret, read_raw;
  double mem_lut= 0.0;
- char eff_img_path[SfileadrL], eff_disk_path[SfileadrL];
+ char eff_img_path[SfileadrL], eff_disk_path[SfileadrL], sfe[SfileadrL*5];
  IsoImage *volume;
  IsoNode *node;
 
@@ -8696,10 +8725,36 @@ int Xorriso_extract_cut(struct XorrisO *xorriso,
                                disk_path, &stbuf_ret, 0);
  if(ret<=0 || ret==3)
    return(0);
+
+ /* If it is a non-filtered stream from the ISO image
+    and img_offset is a multiple of 2048
+    then use Xorriso_read_file_data() for random access offset.
+ */
+ if(!LIBISO_ISREG(node)) {
+   Xorriso_msgs_submit(xorriso, 0, eff_disk_path, 0, "ERRFILE", 0);
+   sprintf(xorriso->info_text, "-extract_cut: ISO file %s is not a data file",
+           Text_shellsafe(eff_img_path, sfe, 0));
+   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
+   return(0);
+ }
+ read_raw= 0;
+ if((img_offset % 2048) == 0) {
+   ret= Xorriso_is_plain_image_file(xorriso, node, 0);
+   if(ret > 0)
+     read_raw= 1;
+ }
+ if (read_raw) {
    ret= Xorriso_read_file_data(xorriso, node, eff_img_path, eff_disk_path,
                                img_offset, (off_t) 0, bytes, 0);
    if(ret<=0)
      return(ret);
+ } else {
+   ret= Xorriso_tree_restore_node(xorriso, node, eff_img_path, img_offset,
+                                  eff_disk_path, (off_t) 0, bytes, 2 | 8);
+   if(ret<=0)
+     return(ret);
+ }
+
  ret= Xorriso_restore_properties(xorriso, eff_disk_path, node, 0);
  if(ret<=0)
    return(ret);