Taken from upstream PR#5 (https://github.com/asciidoc/asciidoc-py3/pull/5)

6469317 Remove unnecessary decode in a2x (Matthew Peveler)

684913e Fix decoding of file that specifies encoding in header tag in a2x (Matthew Peveler)

8369a97 re-add --nonet option (Matthew Peveler)

diff --git c/a2x.py w/a2x.py

index 55eb57e..c015079 100755

--- c/a2x.py

+++ w/a2x.py

@@ -254,15 +254,11 @@ def find_resources(files, tagname, attrname, filter=None):

         if OPTIONS.dry_run:

             continue

         parser = FindResources()

-        # HTMLParser has problems with non-ASCII strings.

-        # See http://bugs.python.org/issue3932

-        contents = read_file(filename)

-        mo = re.search(r'\A<\?xml.* encoding="(.*?)"', contents)

-        if mo:

-            encoding = mo.group(1)

-            parser.feed(contents.decode(encoding))

-        else:

-            parser.feed(contents)

+        with open(filename, 'rb') as open_file:

+            contents = open_file.read()

+        mo = re.search(b'\A<\?xml.* encoding="(.*?)"', contents)

+        contents = contents.decode(mo.group(1).decode('utf-8') if mo else 'utf-8')

+        parser.feed(contents)

         parser.close()

     result = list(set(result))   # Drop duplicate values.

     result.sort()

@@ -337,7 +333,7 @@ def get_source_options(asciidoc_file):

     result = []

     if os.path.isfile(asciidoc_file):

         options = ''

-        with open(asciidoc_file) as f:

+        with open(asciidoc_file, encoding='utf-8') as f:

             for line in f:

                 mo = re.search(r'^//\s*a2x:', line)

                 if mo: