Fix pdfminer's name2unicode function

    Font cids that are mapped to names of the form /g123 seem to be, by convention
    characters with no corresponding Unicode entry. These can be subsetted fonts
    or symbolic fonts. There seems to be no way to map /g123 fonts to Unicode,
    barring a ToUnicode data structure.

def name2unicode(name):
    """Fix pdfminer's name2unicode function

    Font cids that are mapped to names of the form /g123 seem to be, by convention
    characters with no corresponding Unicode entry. These can be subsetted fonts
    or symbolic fonts. There seems to be no way to map /g123 fonts to Unicode,
    barring a ToUnicode data structure.
    """
    if name in glyphname2unicode:
        return glyphname2unicode[name]
    if name.startswith('g') or name.startswith('a'):
        raise KeyError(name)
    if name.startswith('uni'):
        try:
            return chr(int(name[3:], 16))
        except ValueError:  # Not hexadecimal
            raise KeyError(name)
    m = STRIP_NAME.search(name)
    if not m:
        raise KeyError(name)
    return chr(int(m.group(0)))