hashmap: factor out getting a hash code from a SHA1

diff --git a/hashmap.h b/hashmap.h
index a816ad47b14d2d377ba0e03a3f401ed36a56efa8..c51fd0abf78c98a7b74b719ba2d18ec77507d41e 100644 (file)
--- a/hashmap.h
+++ b/hashmap.h
@@ -13,6 +13,17 @@ extern unsigned int strihash(const char *buf);
 extern unsigned int memhash(const void *buf, size_t len);
 extern unsigned int memihash(const void *buf, size_t len);
 
+static inline unsigned int sha1hash(const unsigned char *sha1)
+{
+       /*
+        * Equivalent to 'return *(unsigned int *)sha1;', but safe on
+        * platforms that don't support unaligned reads.
+        */
+       unsigned int hash;
+       memcpy(&hash, sha1, sizeof(hash));
+       return hash;
+}
+
 /* data structures */
 
 struct hashmap_entry {