Ebook-viewer: Handle non-ascii CSS files when doing font substituitions

src/calibre/ebooks/oeb/iterator.py

@@ -152,13 +152,17 @@ class EbookIterator(object):
                         prints('Substituting font family: %s -> %s'%(bad, good))
                         return match.group().replace(bad, '"%s"'%good)
 
+            from calibre.ebooks.chardet import force_encoding
             for csspath in css_files:
                 with open(csspath, 'r+b') as f:
                     css = f.read()
-                    css = font_family_pat.sub(prepend_embedded_font, css)
-                    f.seek(0)
-                    f.truncate()
-                    f.write(css)
+                    enc = force_encoding(css, False)
+                    css = css.decode(enc, 'replace')
+                    ncss = font_family_pat.sub(prepend_embedded_font, css)
+                    if ncss != css:
+                        f.seek(0)
+                        f.truncate()
+                        f.write(ncss.encode(enc))
 
     def __enter__(self, processed=False):
         self.delete_on_exit = []

src/calibre/utils/network.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
+from __future__ import with_statement
+
+__license__   = 'GPL v3'
+__copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
+__docformat__ = 'restructuredtext en'
+
+from calibre.constants import iswindows, islinux, isfreebsd
+
+class LinuxNetworkStatus(object):
+
+    def __init__(self):
+        try:
+            import dbus
+            bus = dbus.SystemBus()
+            proxy = bus.get_object("org.freedesktop.NetworkManager",
+                        "/org/freedesktop/NetworkManager")
+            self.manager = dbus.Interface(proxy, "org.freedesktop.DBus.Properties")
+        except:
+            self.manager = None
+
+    def __call__(self):
+        if self.manager is None:
+            return True
+        try:
+            connections = self.manager.Get("org.freedesktop.NetworkManager",
+                        "ActiveConnections")
+            return len(connections) > 0
+        except:
+            return True
+
+class WindowsNetworkStatus(object):
+
+    def __init__(self):
+        from calibre.constants import plugins
+        self.winutil = plugins['winutil'][0]
+
+    def __call__(self):
+        if self.winutil is None:
+            return True
+        return self.winutil.internet_connected()
+
+class DummyNetworkStatus(object):
+
+    def __call__(self):
+        return True
+
+_network_status = WindowsNetworkStatus() if iswindows else \
+        LinuxNetworkStatus() if (islinux or isfreebsd) else \
+        DummyNetworkStatus()
+
+def internet_connected():
+    return _network_status()