Store joliet-related info in Ecma119Image target insted of Writer.

In fact, this is not a good decission, writer is a better place for 
writer dependent data, but for now I prefer to store anything in the 
target. Later we can improve Writer encapsulation.

src/ecma119.c

@@ -825,6 +825,7 @@ int ecma119_image_new(IsoImage *src, Ecma119WriteOpts *opts, Ecma119Image **img)
 
     target->iso_level = opts->level;
     target->rockridge = opts->rockridge;
+    target->joliet = 0; //TODO opts->joliet;
     target->ino = 0;
     target->omit_version_numbers = opts->omit_version_numbers;
     target->allow_deep_paths = opts->allow_deep_paths;

src/ecma119.h

@@ -20,6 +20,7 @@
 
 typedef struct ecma119_image Ecma119Image;
 typedef struct ecma119_node Ecma119Node;
+typedef struct joliet_node JolietNode;
 typedef struct Iso_File_Src IsoFileSrc;
 typedef struct Iso_Image_Writer IsoImageWriter;
 
@@ -32,6 +33,7 @@ struct ecma119_image
 
     /* extensions */
     unsigned int rockridge :1;
+    unsigned int joliet :1;
 
     /* relaxed constraints */
     unsigned int omit_version_numbers :1;
@@ -95,6 +97,11 @@ struct ecma119_image
     uint32_t path_table_size;
     uint32_t l_path_table_pos;
     uint32_t m_path_table_pos;
+    
+    /*
+     * Joliet related information
+     */
+    JolietNode *joliet_root;
 
     /*
      * Number of pad blocks that we need to write. Padding blocks are blocks

src/joliet.c

@@ -245,17 +245,14 @@ void sort_tree(JolietNode *root)
 }
 
 static
-int joliet_tree_create(IsoImageWriter *writer)
+int joliet_tree_create(Ecma119Image *t)
 {
     int ret;
     JolietNode *root;
-    Ecma119Image *t;
     
-    if (writer == NULL || writer->target == NULL) {
+    if (t == NULL) {
         return ISO_NULL_POINTER;
     }
-    
-    t = writer->target;
 
     ret = create_tree(t, (IsoNode*)t->image->root, &root, 0);
     if (ret <= 0) {
@@ -266,14 +263,14 @@ int joliet_tree_create(IsoImageWriter *writer)
         return ret;
     }
     
-    /* the Joliet tree is stored in the writer data field */
-    writer->data = root;
+    /* the Joliet tree is stored in Ecma119Image target */
+    t->joliet_root = root;
 
     iso_msg_debug(t->image->messenger, "Sorting the Joliet tree...");
     sort_tree(root);
 
     //iso_msg_debug(t->image->messenger, "Mangling Joliet names...");
-    // FIXME ret = mangle_tree(writer, 1);
+    // FIXME ret = mangle_tree(t, 1);
 
     return ISO_SUCCESS;
 }
@@ -303,7 +300,8 @@ static
 int joliet_writer_free_data(IsoImageWriter *writer)
 {
     /* free the Joliet tree */
-    joliet_node_free(writer->data);
+    Ecma119Image *t = writer->target;
+    joliet_node_free(t->joliet_root);
     return ISO_SUCCESS;
 }
 
@@ -326,7 +324,7 @@ int joliet_writer_create(Ecma119Image *target)
 
     iso_msg_debug(target->image->messenger, 
                   "Creating low level Joliet tree...");
-    ret = joliet_tree_create(writer);
+    ret = joliet_tree_create(target);
     if (ret < 0) {
         return ret;
     }

src/joliet.h

@@ -17,8 +17,6 @@
 #include "libisofs.h"
 #include "ecma119.h"
 
-typedef struct joliet_node JolietNode;
-
 enum joliet_node_type {
 	JOLIET_FILE,
 	JOLIET_DIR