X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Fsha1.h;h=8573c5435bed079b83db967eabec52224e9afe35;hb=868f9905359573d33f06c19106523535b309273b;hp=5c1436170f8b2b79b6beb3098dd44bf36d737002;hpb=db046c7191d39535dfb49e9b9bdfc0751a8c17b4;p=wimlib

diff --git a/src/sha1.h b/src/sha1.h
index 5c143617..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])
 {
@@ -25,13 +27,32 @@ 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[])
+static inline void print_hash(const u8 hash[SHA1_HASH_SIZE])
 {
 	print_byte_field(hash, SHA1_HASH_SIZE);
 }
 
+static inline bool is_zero_hash(const u8 hash[SHA1_HASH_SIZE])
+{
+	if (hash)
+		for (u8 i = 0; i < SHA1_HASH_SIZE / 4; i++)
+			if (((u32*)hash)[i])
+				return false;
+	return true;
+}
+
+static inline void zero_out_hash(u8 hash[SHA1_HASH_SIZE])
+{
+	memset(hash, 0, SHA1_HASH_SIZE);
+}
+
 
 #ifdef WITH_LIBCRYPTO