From 0715cc5f94438d58e2fc59c065a0afbd3dbb525a Mon Sep 17 00:00:00 2001
From: Helmut Grohne <helmut@subdivi.de>
Date: Sat, 16 Apr 2016 11:22:18 +0200
Subject: add a validate method to HashedStream

---
 dedup/hashing.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'dedup')

diff --git a/dedup/hashing.py b/dedup/hashing.py
index 1419811..2a83929 100644
--- a/dedup/hashing.py
+++ b/dedup/hashing.py
@@ -183,3 +183,13 @@ class HashedStream(object):
 
     def hexdigest(self):
         return self.hashobj.hexdigest()
+
+    def validate(self, hexdigest):
+        """Soak up any remaining input and validate the read data using the
+        given hexdigest.
+        @raises ValueError: when the hash does not match
+        """
+        while self.read(65536):
+            pass
+        if self.hexdigest() != hexdigest:
+            raise ValueError("hash sum mismatch")
-- 
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