Merge pull request #632 from arrbee/win64-cleanup

Code clean up, including fixing warnings on Windows 64-bit build

include/git2/refs.h

@@ -32,6 +32,17 @@ GIT_BEGIN_DECL
  */
 GIT_EXTERN(int) git_reference_lookup(git_reference **reference_out, git_repository *repo, const char *name);
 
+/**
+ * Lookup a reference by name and resolve immediately to OID.
+ *
+ * @param oid Pointer to oid to be filled in
+ * @param repo The repository in which to look up the reference
+ * @param name The long name for the reference
+ * @return 0 on success, -1 if name could not be resolved
+ */
+GIT_EXTERN(int) git_reference_name_to_oid(
+	git_oid *out, git_repository *repo, const char *name);
+
 /**
  * Create a new symbolic reference.
  *
@@ -304,6 +315,15 @@ GIT_EXTERN(int) git_reference_reload(git_reference *ref);
  */
 GIT_EXTERN(void) git_reference_free(git_reference *ref);
 
+/**
+ * Compare two references.
+ *
+ * @param ref1 The first git_reference
+ * @param ref2 The second git_reference
+ * @return GIT_SUCCESS if the same, else a stable but meaningless ordering.
+ */
+GIT_EXTERN(int) git_reference_cmp(git_reference *ref1, git_reference *ref2);
+
 /** @} */
 GIT_END_DECL
 #endif