Implement function to get node from path on image. Little unit test too.

src/libisofs.h

@@ -638,6 +638,21 @@ int iso_tree_add_new_special(IsoDir *parent, const char *name, mode_t mode,
 int iso_tree_add_node(IsoImage *image, IsoDir *parent, const char *path, 
                       IsoNode **node);
 
+/**
+ * Locate a node by its path on image.
+ * 
+ * @param node
+ *     Location for a pointer to the node, it will filled with NULL if the 
+ *     given path does not exists on image.
+ *     The node will be owned by the image and shouldn't be unref(). Just call
+ *     iso_node_ref() to get your own reference to the node.
+ *     Note that you can pass NULL is the only thing you want to do is check
+ *     if a node with such path really exists.
+ * @return
+ *      1 found, 0 not found, < 0 error
+ */
+int iso_tree_path_to_node(IsoImage *image, const char *path, IsoNode **node);
+
 #define ISO_MSGS_MESSAGE_LEN 4096
 
 /** 

src/tree.c

@@ -441,3 +441,52 @@ int iso_tree_add_node(IsoImage *image, IsoDir *parent, const char *path,
     result = iso_tree_add_node_builder(parent, file, image->builder, node);
     return result;
 }
+
+int iso_tree_path_to_node(IsoImage *image, const char *path, IsoNode **node)
+{
+    int result;
+    IsoNode *n;
+    IsoDir *dir;
+    char *ptr, *brk_info, *component;
+
+    if (image == NULL || path == NULL) {
+        return ISO_NULL_POINTER;
+    }
+
+    /* get the first child at the root of the image that is "/" */
+    dir = image->root;
+    n = (IsoNode *)dir;
+    if (!strcmp(path, "/")) {
+        if (node) {
+            *node = n;
+        }
+        return ISO_SUCCESS;
+    }
+
+    ptr = strdup(path);
+    result = 0;
+    
+    /* get the first component of the path */
+    component = strtok_r(ptr, "/", &brk_info);
+    while (component) {
+        if (n->type != LIBISO_DIR) {
+            n = NULL;
+            break;
+        }
+        dir = (IsoDir *)n;
+
+        result = iso_dir_get_node(dir, component, &n);
+        if (result != 1) {
+            n = NULL;
+            break;
+        }
+
+        component = strtok_r(NULL, "/", &brk_info);
+    }
+
+    free(ptr);
+    if (node) {
+        *node = n;
+    }
+    return result;
+}

test/test_tree.c

@@ -396,7 +396,7 @@ void test_iso_tree_add_node_link()
 {
     int result;
     IsoDir *root;
-    IsoNode *node1, *node2, *node3, *node4;
+    IsoNode *node1, *node2, *node3;
     IsoImage *image;
     IsoFilesystem *fs;
     struct stat info;
@@ -498,6 +498,57 @@ void test_iso_tree_add_node_link()
     iso_image_unref(image);
 }
 
+static
+void test_iso_tree_path_to_node()
+{
+    int result;
+    IsoDir *root;
+    IsoDir *node1, *node2, *node11;
+    IsoNode *node;
+    IsoImage *image;
+    IsoFilesystem *fs;
+    struct stat info;
+    
+    result = iso_image_new("volume_id", &image);
+    CU_ASSERT_EQUAL(result, 1);
+    root = iso_image_get_root(image);
+    CU_ASSERT_PTR_NOT_NULL(root);
+    
+    /* replace image filesystem with out mockep one */
+    iso_filesystem_unref(image->fs);
+    result = test_mocked_filesystem_new(&fs);
+    CU_ASSERT_EQUAL(result, 1);
+    image->fs = fs;
+    
+    /* add some files */
+    result = iso_tree_add_new_dir(root, "Dir1", &node1);
+    CU_ASSERT_EQUAL(result, 1);
+    result = iso_tree_add_new_dir(root, "Dir2", (IsoDir**)&node2);
+    CU_ASSERT_EQUAL(result, 2);
+    result = iso_tree_add_new_dir((IsoDir*)node1, "Dir11", (IsoDir**)&node11);
+    CU_ASSERT_EQUAL(result, 1);
+    
+    /* retrive some items */
+    result = iso_tree_path_to_node(image, "/", &node);
+    CU_ASSERT_EQUAL(result, 1);
+    CU_ASSERT_PTR_EQUAL(node, root);
+    result = iso_tree_path_to_node(image, "/Dir1", &node);
+    CU_ASSERT_EQUAL(result, 1);
+    CU_ASSERT_PTR_EQUAL(node, node1);
+    result = iso_tree_path_to_node(image, "/Dir2", &node);
+    CU_ASSERT_EQUAL(result, 1);
+    CU_ASSERT_PTR_EQUAL(node, node2);
+    result = iso_tree_path_to_node(image, "/Dir1/Dir11", &node);
+    CU_ASSERT_EQUAL(result, 1);
+    CU_ASSERT_PTR_EQUAL(node, node11);
+    
+    /* some failtures */
+    result = iso_tree_path_to_node(image, "/Dir2/Dir11", &node);
+    CU_ASSERT_EQUAL(result, 0);
+    CU_ASSERT_PTR_NULL(node);
+    
+    iso_image_unref(image);
+}
 
 void add_tree_suite()
 {
@@ -508,5 +559,6 @@ void add_tree_suite()
     CU_add_test(pSuite, "iso_tree_add_new_special()", test_iso_tree_add_new_special);
     CU_add_test(pSuite, "iso_tree_add_node() [1. dir]", test_iso_tree_add_node_dir);
     CU_add_test(pSuite, "iso_tree_add_node() [2. symlink]", test_iso_tree_add_node_link);
+    CU_add_test(pSuite, "iso_tree_path_to_node()", test_iso_tree_path_to_node);
     
 }