New API call iso_write_opts_set_will_cancel()

libisofs/ecma119.c

@@ -1412,7 +1412,9 @@ void *write_function(void *arg)
     target->eff_partition_offset = 0;
     if (res == ISO_CANCELED) {
         /* canceled */
-        iso_msg_submit(target->image->id, ISO_IMAGE_WRITE_CANCELED, 0, NULL);
+        if (!target->will_cancel)
+            iso_msg_submit(target->image->id, ISO_IMAGE_WRITE_CANCELED,
+                           0, NULL);
     } else {
         /* image write error */
         iso_msg_submit(target->image->id, ISO_WRITE_ERROR, res,
@@ -1565,6 +1567,7 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
     target->image = src;
     iso_image_ref(src);
 
+    target->will_cancel = opts->will_cancel;
     target->iso_level = opts->level;
     target->rockridge = opts->rockridge;
     target->joliet = opts->joliet;
@@ -2330,6 +2333,7 @@ int iso_write_opts_new(IsoWriteOpts **opts, int profile)
     for (i = 0; i < ISO_MAX_PARTITIONS; i++)
         wopts->appended_partitions[i] = NULL;
     wopts->ascii_disc_label[0] = 0;
+    wopts->will_cancel = 0;
 
     *opts = wopts;
     return ISO_SUCCESS;
@@ -2352,6 +2356,15 @@ void iso_write_opts_free(IsoWriteOpts *opts)
     free(opts);
 }
 
+int iso_write_opts_set_will_cancel(IsoWriteOpts *opts, int will_cancel)
+{
+    if (opts == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    opts->will_cancel = !!will_cancel;
+    return ISO_SUCCESS;
+}
+
 int iso_write_opts_set_iso_level(IsoWriteOpts *opts, int level)
 {
     if (opts == NULL) {

libisofs/ecma119.h

@@ -57,6 +57,8 @@
  */
 struct iso_write_opts {
 
+    int will_cancel;
+
     int level; /**< ISO level to write at. (ECMA-119, 10) */
 
     /** Which extensions to support. */
@@ -379,6 +381,8 @@ struct ecma119_image
     IsoImage *image;
     Ecma119Node *root;
 
+    int will_cancel :1;
+
     unsigned int iso_level :2;
 
     /* extensions */

libisofs/libisofs.h

@@ -1205,6 +1205,26 @@ int iso_write_opts_new(IsoWriteOpts **opts, int profile);
  */
 void iso_write_opts_free(IsoWriteOpts *opts);
 
+/**
+ * Announce that only the image size is desired and that the write thread
+ * will be cancelled by the .cancel() method of the struct burn_source that
+ * consumes the image output stream.
+ * This avoids to generate a MISHAP event when the effect of .cancel()
+ * reaches the image generator thread.
+ * 
+ * @param opts
+ *      The option set to be manipulated.
+ * @param will_cancel
+ *      0= normal image generation
+ *      1= prepare for being canceled before image stream output is completed
+ * @return
+ *      1 success, < 0 error
+ *
+ * @since 0.6.40
+ */
+int iso_write_opts_set_will_cancel(IsoWriteOpts *opts, int will_cancel);
+
+
 /**
  * Set the ISO-9960 level to write at.
  *

libisofs/libisofs.ver

@@ -293,6 +293,7 @@ iso_write_opts_set_scdbackup_tag;
 iso_write_opts_set_sort_files;
 iso_write_opts_set_system_area;
 iso_write_opts_set_tail_blocks;
+iso_write_opts_set_will_cancel;
 iso_zisofs_get_params;
 iso_zisofs_get_refcounts;
 iso_zisofs_set_params;