Added error for ambiguous oid prefixes. Added methods to compare the first nth hexadecimal characters (i.e. packets of 4 bits) of OIDs.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/oid.c b/src/oid.c
index 5c5238bb1..f743da8ac 100644
--- a/src/oid.c
+++ b/src/oid.c
@@ -173,6 +173,26 @@ int git_oid_cmp(const git_oid *a, const git_oid *b)
 }
 
 
+int git_oid_match_raw(unsigned int len, const unsigned char *a, const unsigned char *b)
+{
+        do {
+                if (*a != *b)
+                        return 0;
+                a++;
+                b++;
+                len -= 2;
+        } while (len > 1);
+        if (len)
+                if ((*a ^ *b) & 0xf0)
+                        return 0;
+        return 1;
+}
+
+int gid_oid_match(unsigned int len, git_oid *a, git_oid *b)
+{
+	return git_oid_match_raw(len, a->id, b->id);
+}
+
 typedef short node_index;
 
 typedef union {