Fix some compiler warnings

[wimlib] / src / lookup_table.h

diff --git a/src/lookup_table.h b/src/lookup_table.h
index 5620e678e865c2f3859e35bf60821273eb543f05..91684c4319ab3fcaaacfc945e9cca2916ac44516 100644 (file)
--- a/src/lookup_table.h
+++ b/src/lookup_table.h
@@ -35,8 +35,17 @@ struct lookup_table_entry {
        /* Number of times this lookup table entry is referenced by dentries. */
        u32 refcnt;
 
-       /* SHA1 hash of the file resource pointed to by this lookup table entry */
-       u8  hash[WIM_HASH_SIZE];
+       union {
+               /* SHA1 hash of the file resource pointed to by this lookup
+                * table entry */
+               u8  hash[WIM_HASH_SIZE];
+
+               /* First 4 or 8 bytes of the SHA1 hash, used for inserting the
+                * entry into the hash table.  Since the SHA1 hashes can be
+                * considered random, we don't really need the full 20 byte hash
+                * just to insert the entry in a hash table. */
+               size_t hash_short;
+       };
 
        /* If @file_on_disk != NULL, the file resource indicated by this lookup
         * table entry is not in the WIM file, but rather a file on disk; this