COLLECTION Functions to deal with hash

The hashing logic was internal to the collection item.
But if someone wants to effectively deal with
the items and compare the property to a string
he should compare hashes first. But it was not possible
without the provided functions. As a result some
of the ELAPI modules had to take advantage of
knowledge of the item structure. This is bad.
So this patch lays foundation for refactoring
of the ELAPI code that was using internals of the item
directly (file_util.c mostly).
Also patch adds a unit test that was required for
testing new functionality and for ticket #83

1 files changed, 10 insertions, 0 deletions

diff --git a/common/collection/collection.h b/common/collection/collection.h
index 1ff038e15..dc59ea2f9 100644
--- a/common/collection/collection.h
+++ b/common/collection/collection.h
@@ -22,6 +22,8 @@
 #ifndef COLLECTION_H
 #define COLLECTION_H
 
+#include <stdint.h>
+
 #ifndef EOK
 #define EOK 0
 #endif
@@ -490,6 +492,14 @@ const char *col_get_item_property(struct collection_item *ci, int *property_len)
 int col_get_item_type(struct collection_item *ci);
 int col_get_item_length(struct collection_item *ci);
 void *col_get_item_data(struct collection_item *ci);
+uint64_t col_get_item_hash(struct collection_item *ci);
+
+/* Calculates hash of the string using internal hashing
+ * algorithm. Populates "length" with length
+ * of the string not counting 0.
+ * Length argument can be NULL.
+ */
+uint64_t col_make_hash(const char *string, int *length);
 
 /* If you want to modify the item that you got as a result of iterating through collection
  * or by calling col_get_item(). If you want to rename item provide a new name in the property