fix: Indexing bytes produces int on python3 for pssh-box.py (sh…

…aka-project#1228)

Fixes shaka-project#1227

packager/tools/pssh/pssh-box.py

@@ -20,6 +20,17 @@
 import struct
 import sys
 
+
+def to_code_point(value):
+  """
+  Return the unicode code point with `int` passthrough
+  """
+  if isinstance(value, int):
+    return value
+
+  return ord(value)
+
+
 _script_dir = os.path.dirname(os.path.realpath(__file__))
 _proto_path = os.path.join(_script_dir, 'pyproto')
 _widevine_proto_path = os.path.join(_proto_path, 'packager/media/base')
@@ -64,9 +75,9 @@ def read_int(self, size):
     ret = 0
     for i in range(0, size):
       if self.little_endian:
-        ret |= (ord(data[i]) << (8 * i))
+        ret |= (to_code_point(data[i]) << (8 * i))
       else:
-        ret |= (ord(data[i]) << (8 * (size - i - 1)))
+        ret |= (to_code_point(data[i]) << (8 * (size - i - 1)))
     return ret