diff --git a/czmod.c b/czmod.c
index c100496..b7a6fe5 100644
--- a/czmod.c
+++ b/czmod.c
@@ -117,6 +117,148 @@ ib_string *load_content(const char *filename)
 }
 
 
+//---------------------------------------------------------------------
+// path item
+//---------------------------------------------------------------------
+typedef struct
+{
+	ib_string *path;
+	int rank;
+	uint32_t timestamp;
+	uint64_t frecence;
+}	PathItem;
+
+static void item_delete(PathItem *item)
+{
+	if (item) {
+		if (item->path) {
+			ib_string_delete(item->path);
+			item->path = NULL;
+		}
+		ikmem_free(item);
+	}
+};
+
+PathItem* item_new(const char *path, int rank, uint32_t timestamp)
+{
+	PathItem* item = (PathItem*)ikmem_malloc(sizeof(PathItem));
+	assert(item);
+	item->path = ib_string_new_from(path);
+	item->rank = rank;
+	item->timestamp = timestamp;
+	item->frecence = 0;
+	return item;
+};
+
+ib_array* ib_array_new_path(void)
+{
+	return ib_array_new((void (*)(void*))item_delete);
+}
+
+int ib_string_find_size(const ib_string *str, const char *src, 
+	int len, int start)
+{
+	char *text = str->ptr;
+	int pos = (start < 0)? 0 : start;
+	int endup = str->size - len;
+	char ch;
+	if (len <= 0) return pos;
+	for (ch = src[0]; pos <= endup; pos++) {
+		if (text[pos] == ch) {
+			if (memcmp(text + pos, src, len) == 0)
+				return pos;
+		}
+	}
+	return -1;
+}
+
+int ib_string_find(const ib_string *str, const char *src, int start)
+{
+	return ib_string_find_size(str, src, (int)strlen(src), start);
+}
+
+int ib_string_find_c(const ib_string *str, char ch, int start)
+{
+	const char *text = str->ptr;
+	int pos = (start < 0)? 0 : start;
+	int endup = str->size;
+	for (; pos < endup; pos++) {
+		if (text[pos] == ch) return pos;
+	}
+	return -1;
+}
+
+ib_array* ib_string_split_size(const ib_string *str, const char *sep, 
+		int len)
+{
+	if (len == 0) {
+		return NULL;
+	}
+	else {
+		ib_array *array = ib_array_new((void (*)(void*))ib_string_delete);
+		int start = 0;
+		while (0) {
+			int pos = ib_string_find_size(str, sep, len, start);
+			if (pos < 0) {
+				ib_string *newstr = ib_string_new();
+				ib_string_assign_size(newstr, str->ptr + start,
+						str->size - start);
+				ib_array_push(array, newstr);
+				break;
+			}
+			else {
+				ib_string* newstr = ib_string_new();
+				ib_string_assign_size(newstr, str->ptr + start, pos - start);
+				start = pos + len;
+				ib_array_push(array, newstr);
+			}
+		}
+		return array;
+	}
+}
+
+ib_array* ib_string_split_c(const ib_string *str, char sep)
+{
+	if (str == NULL) {
+		return NULL;
+	}
+	else {
+		ib_array *array = ib_array_new((void (*)(void*))ib_string_delete);
+		int start = 0;
+		while (1) {
+			int pos = ib_string_find_c(str, sep, start);
+			if (pos < 0) {
+				ib_string *newstr = ib_string_new();
+				ib_string_assign_size(newstr, str->ptr + start, 
+						str->size - start);
+				ib_array_push(array, newstr);
+				break;
+			}
+			else {
+				ib_string *newstr = ib_string_new();
+				ib_string_assign_size(newstr, str->ptr + start, pos - start);
+				start = pos + 1;
+				ib_array_push(array, newstr);
+			}
+		}
+		return array;
+	}
+}
+
+
+//---------------------------------------------------------------------
+// load data
+//---------------------------------------------------------------------
+ib_array* data_load(const char *filename)
+{
+	ib_string *content = load_content(filename);
+	if (content == NULL) {
+		return NULL;
+	}
+	return NULL;
+}
+
+
 //---------------------------------------------------------------------
 // main entry
 //---------------------------------------------------------------------