fix issue w/ calculating size of last piece...

ui/medashare/btv/__init__.py

@@ -47,7 +47,10 @@ class Storage:
 			# get length
 			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) ]
+			self._pieceindex = [ [ dict(file=self._rootpath,
+			    offset=x * piecelen, size=piecelen if
+			    x < piececnt - 1 else sz - x * piecelen) ] for x in
+			    range(piececnt) ]
 		else:
 			self._buildindex()
 
@@ -391,6 +394,18 @@ class _TestCases(unittest.TestCase):
 		self.assertFalse(good)
 		self.assertEqual(hashes, {})
 
+		shutil.copy(self.fixtures / '40plus1.txt.torrent', self.basetempdir)
+		tor = self.basetempdir / '40plus1.txt.torrent'
+
+		with open(sd / '40plus1.txt', 'w') as fp:
+			fp.write('w')
+
+		good, bad, hashes = validate_file(tor, with_file_hashes=sha512)
+
+		self.assertEqual(bad, { sd / '40plus1.txt' })
+		self.assertFalse(good)
+		self.assertEqual(hashes, {})
+
 	def test_verification(self):
 		# Testing for "missing" files
 		# piece size 2 (aka 4 bytes)

ui/medashare/btv/fixtures/40plus1.txt.torrent

@@ -0,0 +1 @@
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