move badfiles to class, encoding is ONLY UTF-8 per BEP-3

https://www.bittorrent.org/beps/bep_0003.html

__init__.py

@@ -11,12 +11,14 @@ import sys
 import tempfile
 import unittest
 
+_encoding = 'utf-8'
+
 class Storage:
-	def __init__(self, rootpath, files, piecelen, encoding='us-ascii'):
+
+	def __init__(self, rootpath, files, piecelen):
 		self._rootpath = pathlib.Path(rootpath)
 		self._files = files
 		self._piecelen = piecelen
-		self._encoding = encoding
 
 		self._buildindex()
 
@@ -31,7 +33,7 @@ class Storage:
 
 		for curfile in self._files:
 			fname = pathlib.PurePath(
-			    *(x.decode(self._encoding) for x in
+			    *(x.decode(_encoding) for x in
 			    curfile['path']))
 			curfilepath = self._rootpath / fname
 
@@ -90,15 +92,9 @@ def validate(torrent, basedir):
 
 	basedir = pathlib.Path(basedir)
 
-	try:
-		encoding = torrent['encoding'].decode('us-ascii')
-	except KeyError:
-		encoding = 'us-ascii'
+	torrentdir = basedir / info['name'].decode(_encoding)
 
-	torrentdir = basedir / info['name'].decode(encoding)
-
-	stor = Storage(torrentdir, info['files'], info['piece length'],
-	    encoding)
+	stor = Storage(torrentdir, info['files'], info['piece length'])
 
 	pieces = info['pieces']
 	piecescnt = len(pieces) // 20
@@ -124,6 +120,8 @@ def validate(torrent, basedir):
 
 class _TestCases(unittest.TestCase):
 	dirname = 'somedir'
+
+	# file contents for somedir.torrent
 	origfiledata = {
 		'filea.txt':	b'foo\n',
 		'fileb.txt':	b'bar\n',
@@ -133,6 +131,13 @@ class _TestCases(unittest.TestCase):
 		'filef/filef.txt':	b'\n',
 	}
 
+	# some munging to make some files bad
+	badfiles = {
+		'filea.txt': b'',
+		'filec.txt': b'\x00\x00\x00\x00a\n',
+		'filee.txt': b'no',
+	}
+
 	def setUp(self):
 		d = pathlib.Path(tempfile.mkdtemp()).resolve()
 
@@ -196,13 +201,7 @@ class _TestCases(unittest.TestCase):
 
 		missingfiles = self.origfiledata.copy()
 
-		badfiles = {
-			'filea.txt': b'',
-			'filec.txt': b'\x00\x00\x00\x00a\n',
-			'filee.txt': b'no',
-		}
-
-		missingfiles.update(badfiles)
+		missingfiles.update(self.badfiles)
 
 		sd = self.basetempdir / self.dirname
 		sd.mkdir()
@@ -212,6 +211,6 @@ class _TestCases(unittest.TestCase):
 		val, inval = validate(self.torrent, self.basetempdir)
 
 		self.assertEqual(set(val), { sd / x for x in
-		    missingfiles.keys() if x not in badfiles })
+		    missingfiles.keys() if x not in self.badfiles })
 		self.assertEqual(set(inval), { sd / x for x in
-		    badfiles.keys() })
+		    self.badfiles.keys() })