'Replace fields with supplemental information from a previous
pax extended or global header.'

def _apply_pax_info(self, pax_headers, encoding, errors):

    for (keyword, value) in pax_headers.items():
        if (keyword == 'GNU.sparse.name'):
            setattr(self, 'path', value)
        elif (keyword == 'GNU.sparse.size'):
            setattr(self, 'size', int(value))
        elif (keyword == 'GNU.sparse.realsize'):
            setattr(self, 'size', int(value))
        elif (keyword in PAX_FIELDS):
            if (keyword in PAX_NUMBER_FIELDS):
                try:
                    value = PAX_NUMBER_FIELDS[keyword](value)
                except ValueError:
                    value = 0
            if (keyword == 'path'):
                value = value.rstrip('/')
            setattr(self, keyword, value)
    self.pax_headers = pax_headers.copy()
