From b38809b5d264e223bb1a99a06c1fb72e22ec1b4d Mon Sep 17 00:00:00 2001
From: Micah Lee <micah@micahflee.com>
Date: Thu, 22 May 2014 18:56:53 -0400
Subject: [PATCH] calculates sha1 checksum in chunks now. fixes #7

---
 onionshare.py | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/onionshare.py b/onionshare.py
index aa498e4c..e5e3fa0a 100755
--- a/onionshare.py
+++ b/onionshare.py
@@ -69,13 +69,15 @@ if __name__ == '__main__':
         sys.exit('{0} is not a file'.format(filename))
 
     # calculate filehash, file size
-    sha1 = hashlib.sha1()
-    f = open(filename, 'rb')
-    try:
-        sha1.update(f.read())
-    finally:
-        f.close()
-    filehash = sha1.hexdigest()
+    print 'Calculate sha1 checksum'
+    BLOCKSIZE = 65536
+    hasher = hashlib.sha1()
+    with open(filename, 'rb') as f:
+        buf = f.read(BLOCKSIZE)
+        while len(buf) > 0:
+            hasher.update(buf)
+            buf = f.read(BLOCKSIZE)
+    filehash = hasher.hexdigest()
     filesize = os.path.getsize(filename)
 
     # choose a port