diff --git a/ui/medashare/btv/__init__.py b/ui/medashare/btv/__init__.py
index 5f878a3..c8931f2 100644
--- a/ui/medashare/btv/__init__.py
+++ b/ui/medashare/btv/__init__.py
@@ -30,7 +30,7 @@ class Storage:
 	'''A class to help read pieces of a torrent.
 	'''
 
-	def __init__(self, rootpath, files, piecelen):
+	def __init__(self, rootpath, files, length, piecelen):
 		'''
 		rootpath - path to the dir of torrent files are in
 		files - the files dictionary from the torrent info key
@@ -45,7 +45,7 @@ class Storage:
 
 		if files is None:
 			# get length
-			sz = self._rootpath.stat().st_size
+			sz = length
 			piececnt = roundup(sz, piecelen)
 			self._pieceindex = [ [ dict(file=self._rootpath, offset=x * piecelen, size=piecelen if x < piececnt - 1 else sz - piececnt * x) ] for x in range(piececnt) ]
 		else:
@@ -186,7 +186,8 @@ def validate(torrent, basedir, with_file_hashes=None):
 	torrentdir = basedir / info['name'].decode(_encoding)
 
 	files = info.get('files', None)
-	stor = Storage(torrentdir, files, info['piece length'])
+	length = info.get('length', None)
+	stor = Storage(torrentdir, files, length, info['piece length'])
 
 	file_hashes = dict()
 
@@ -382,7 +383,7 @@ class _TestCases(unittest.TestCase):
 		self.assertEqual(hashes, { sd / 'filed.txt': bytes.fromhex('7831bd05e23877e08a97362bab2ad7bcc7d08d8f841f42e8dee545781792b987aa7637f12cec399e261f798c10d3475add0db7de2643af86a346b6b451a69ec4'), })
 
 		with open(sd / 'filed.txt', 'w') as fp:
-			fp.write('weoifj')
+			fp.write('w')
 
 		good, bad, hashes = validate_file(tor, with_file_hashes=sha512)