From 88adf3f7f2e9c6f1ea3c722ead41a5579b3292bf Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 5 Oct 2019 08:30:00 +0200
Subject: Add sha{1,256}::empty()

---
 libbutl/sha256.mxx | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'libbutl/sha256.mxx')

diff --git a/libbutl/sha256.mxx b/libbutl/sha256.mxx
index fca8b91..2bb58b3 100644
--- a/libbutl/sha256.mxx
+++ b/libbutl/sha256.mxx
@@ -108,6 +108,11 @@ LIBBUTL_MODEXPORT namespace butl
     explicit
     sha256 (ifdstream& i): sha256 () {append (i);}
 
+    // Check if any data has been hashed.
+    //
+    bool
+    empty () const {return empty_;}
+
     // Extract result.
     //
     // It can be obtained as either a 32-byte binary digest or as a 64-
@@ -143,6 +148,7 @@ LIBBUTL_MODEXPORT namespace butl
 
     mutable digest_type bin_;
     mutable bool done_;
+    bool empty_;
   };
 
   // Convert a SHA256 string representation (64 hex digits) to the fingerprint
-- 
cgit v1.1