def open(self, filepath, mode):
        """Opens an hpss file"""
        #want to close any open files first
        try:
            if self._file:
                self.close()
        except ArchiveInterfaceError as ex:
            err_str = "Can't close previous hpss file before "\
                      "opening new one with error: " + str(ex)
            raise ArchiveInterfaceError(err_str)

        #try to open file
        try:
            fpath = un_abs_path(filepath)
            filename = os.path.join(self._prefix, path_info_munge(fpath))
            self._filepath = filename
            hpss = HpssExtended(self._filepath, self._latency)
            hpss.ping_core()
            hpss_fopen = self._hpsslib.hpss_Fopen
            hpss_fopen.restype = c_void_p
            self._file = hpss_fopen(filename, mode)
            if self._file < 0:
                err_str = "Failed opening Hpss File, code: " + str(self._file)
                raise ArchiveInterfaceError(err_str)
            return self
        except Exception as ex:
            err_str = "Can't open hpss file with error: " + str(ex)
            raise ArchiveInterfaceError(err_str)
    def open(self, filepath, mode):
        """Opens an hpss file"""
        #want to close any open files first
        try:
            if self._file:
                self.close()
        except ArchiveInterfaceError as ex:
            err_str = "Can't close previous hpss file before "\
                      "opening new one with error: " + str(ex)
            raise ArchiveInterfaceError(err_str)

        #try to open file
        try:
            fpath = un_abs_path(filepath)
            filename = os.path.join(self._prefix, path_info_munge(fpath))
            self._filepath = filename
            hpss = HpssExtended(self._filepath, self._latency)
            hpss.ping_core()
            hpss_fopen = self._hpsslib.hpss_Fopen
            hpss_fopen.restype = c_void_p
            self._file = hpss_fopen(filename, mode)
            if self._file < 0:
                err_str = "Failed opening Hpss File, code: " + str(self._file)
                raise ArchiveInterfaceError(err_str)
            return self
        except Exception as ex:
            err_str = "Can't open hpss file with error: " + str(ex)
            raise ArchiveInterfaceError(err_str)
 def set_mod_time(self, mod_time):
     """Set the mod time for an hpss archive file """
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             hpss.set_mod_time(mod_time)
     except Exception as ex:
         err_str = "Can't set hpss file mod time with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def status(self):
     """Get the status of a file in the hpss archive """
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             return hpss.status()
     except Exception as ex:
         err_str = "Can't get hpss status with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def stage(self):
     """Stage an hpss file to the top level drive """
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             hpss.stage()
     except Exception as ex:
         err_str = "Can't stage hpss file with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def set_mod_time(self, mod_time):
     """Set the mod time for an hpss archive file """
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             hpss.set_mod_time(mod_time)
     except Exception as ex:
         err_str = "Can't set hpss file mod time with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def status(self):
     """Get the status of a file in the hpss archive """
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             return hpss.status()
     except Exception as ex:
         err_str = "Can't get hpss status with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def stage(self):
     """Stage an hpss file to the top level drive """
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             hpss.stage()
     except Exception as ex:
         err_str = "Can't stage hpss file with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def close(self):
     """Close an HPSS File"""
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             rcode = self._hpsslib.hpss_Fclose(self._file)
             if rcode < 0:
                 err_str = "Failed to close hpss file with code: "+str(rcode)
                 raise ArchiveInterfaceError(err_str)
             self._file = None
     except Exception as ex:
         err_str = "Can't close hpss file with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def write(self, buf):
     """Write a file to the hpss archive"""
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             buf_char_p = cast(buf, c_char_p)
             rcode = self._hpsslib.hpss_Fwrite(buf_char_p, 1, len(buf),
                                               self._file)
             if rcode != len(buf):
                 raise ArchiveInterfaceError("Short write for hpss file")
     except Exception as ex:
         err_str = "Can't write hpss file with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def write(self, buf):
     """Write a file to the hpss archive"""
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             buf_char_p = cast(buf, c_char_p)
             rcode = self._hpsslib.hpss_Fwrite(
                 buf_char_p, 1, len(buf), self._file
             )
             if rcode != len(buf):
                 raise ArchiveInterfaceError("Short write for hpss file")
     except Exception as ex:
         err_str = "Can't write hpss file with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def close(self):
     """Close an HPSS File"""
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             rcode = self._hpsslib.hpss_Fclose(self._file)
             if rcode < 0:
                 err_str = "Failed to close hpss file with code: " + str(
                     rcode)
                 raise ArchiveInterfaceError(err_str)
             self._file = None
     except Exception as ex:
         err_str = "Can't close hpss file with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def read(self, blocksize):
     """Read a file from the hpss archive"""
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             buf = create_string_buffer('\000'*blocksize)
             rcode = self._hpsslib.hpss_Fread(buf, 1, blocksize, self._file)
             if rcode < 0:
                 err_str = "Failed During HPSS Fread,"\
                           "return value is: " + str(rcode)
                 raise ArchiveInterfaceError(err_str)
             return buf.value
     except Exception as ex:
         err_str = "Can't read hpss file with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)
 def read(self, blocksize):
     """Read a file from the hpss archive"""
     try:
         if self._file:
             hpss = HpssExtended(self._filepath, self._latency)
             hpss.ping_core()
             buf = create_string_buffer('\000' * blocksize)
             rcode = self._hpsslib.hpss_Fread(buf, 1, blocksize, self._file)
             if rcode < 0:
                 err_str = "Failed During HPSS Fread,"\
                           "return value is: " + str(rcode)
                 raise ArchiveInterfaceError(err_str)
             return buf.value
     except Exception as ex:
         err_str = "Can't read hpss file with error: " + str(ex)
         raise ArchiveInterfaceError(err_str)