X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fsha1.h;h=7ec8456d20cee8cf633c51ef04617bfa1024cdf0;hp=e73b62a87881ad16f1ae19d1ce6cd0e33d6b5677;hb=751a849fe04a9230a661e38429ff4d971f74bdbf;hpb=f988d892c603e72d1c0a722c2b02b2418ff68c1e

diff --git a/src/sha1.h b/src/sha1.h
index e73b62a8..7ec8456d 100644
--- a/src/sha1.h
+++ b/src/sha1.h
@@ -4,6 +4,16 @@
 #include "config.h"
 #include <stdio.h>
 #include <stddef.h>
+#include "string.h"
+
+#define SHA1_HASH_SIZE 20
+
+extern const u8 empty_file_sha1sum[SHA1_HASH_SIZE];
+
+static inline bool is_empty_file_hash(const u8 hash[SHA1_HASH_SIZE])
+{
+	return memcmp(hash, empty_file_sha1sum, SHA1_HASH_SIZE) == 0;
+}
 
 /* Compute SHA1 message digest for bytes read from STREAM.  The
    resulting message digest number will be written into the 20 bytes