X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fsha1.h;h=8573c5435bed079b83db967eabec52224e9afe35;hp=c44b9f40f76ce46cd78d7c12eec3c86a17d28498;hb=7acdc3aecd7ce546727ae8239e0d942c2a00db43;hpb=774e09230145ee2d8ba58868573213da84a348eb

diff --git a/src/sha1.h b/src/sha1.h
index c44b9f40..8573c543 100644
--- a/src/sha1.h
+++ b/src/sha1.h
@@ -9,6 +9,8 @@
 
 #define SHA1_HASH_SIZE 20
 
+extern const u8 zero_hash[SHA1_HASH_SIZE];
+
 static inline void copy_hash(u8 dest[SHA1_HASH_SIZE],
 			     const u8 src[SHA1_HASH_SIZE])
 {
@@ -25,6 +27,11 @@ static inline bool hashes_equal(const u8 h1[SHA1_HASH_SIZE],
 {
 	return memcmp(h1, h2, SHA1_HASH_SIZE) == 0;
 }
+static inline int hashes_cmp(const u8 h1[SHA1_HASH_SIZE],
+			     const u8 h2[SHA1_HASH_SIZE])
+{
+	return memcmp(h1, h2, SHA1_HASH_SIZE);
+}
 
 /* Prints a hash code field. */
 static inline void print_hash(const u8 hash[SHA1_HASH_SIZE])
@@ -34,13 +41,14 @@ static inline void print_hash(const u8 hash[SHA1_HASH_SIZE])
 
 static inline bool is_zero_hash(const u8 hash[SHA1_HASH_SIZE])
 {
-	for (u8 i = 0; i < SHA1_HASH_SIZE / 4; i++)
-		if (((u32*)hash)[i])
-			return false;
+	if (hash)
+		for (u8 i = 0; i < SHA1_HASH_SIZE / 4; i++)
+			if (((u32*)hash)[i])
+				return false;
 	return true;
 }
 
-static void zero_hash(u8 hash[SHA1_HASH_SIZE])
+static inline void zero_out_hash(u8 hash[SHA1_HASH_SIZE])
 {
 	memset(hash, 0, SHA1_HASH_SIZE);
 }