From 3f70553a078aafbb029782ec092c8d037d9ea45f Mon Sep 17 00:00:00 2001 From: René 'Necoro' Neumann Date: Mon, 27 Jul 2009 23:25:21 +0200 Subject: Moved eix stuff to its own module. Also make all the parsing stuff being functions -- will be easier to deal with for the LazyElements --- portato/eix.py | 146 --------------------------------------------------------- 1 file changed, 146 deletions(-) delete mode 100644 portato/eix.py (limited to 'portato/eix.py') diff --git a/portato/eix.py b/portato/eix.py deleted file mode 100644 index 5262bf2..0000000 --- a/portato/eix.py +++ /dev/null @@ -1,146 +0,0 @@ -# -*- coding: utf-8 -*- -# -# File: portato/eix.py -# This file is part of the Portato-Project, a graphical portage-frontend. -# -# Copyright (C) 2006-2009 René 'Necoro' Neumann -# This is free software. You may redistribute copies of it under the terms of -# the GNU General Public License version 2. -# There is NO WARRANTY, to the extent permitted by law. -# -# Written by René 'Necoro' Neumann - -from __future__ import absolute_import, with_statement - -import os -import struct -from functools import wraps - -from .helper import debug - -class EixError (Exception): - message = "Unknown error." - - def __str__ (self): - return self.message - -class EndOfFileException (EixError): - - def __init__ (self, filename): - self.message = "End of file reached though it was not expected: '%s'" % filename - -class EixReaderClosed (EixError): - message = "EixReader is already closed." - -class UnsupportedVersionError (EixError): - - def __init__ (self, version): - self.message = "Version '%s' is not supported." % version - -class EixReader (object): - supported_versions = (28, ) - - def __init__ (self, filename): - self.filename = filename - self.file = open(filename, "r") - self.closed = 0 - - try: - self.version = self.number() - - if self.version not in self.supported_versions: - raise UnsupportedVersionError(self.version) - - debug("Started EixReader for version %s.", self.version) - except: - self.close() - raise - - def check_closed (f): - @wraps(f) - def wrapper (self, *args, **kwargs): - if self.closed: - raise EixReaderClosed - - return f(self, *args, **kwargs) - return wrapper - - @check_closed - def number (self): - n = self._get_bytes(1) - - if n < 0xFF: - value = n - else: - count = 0 - - while (n == 0xFF): - count += 1 - n = self._get_bytes(1) - - if n == 0: - n = 0xFF # 0xFF is encoded as 0xFF 0x00 - count -= 1 - - value = n << (count*8) - - if count > 0: - rest = self._get_bytes(count, expect_list = True) - - for i, r in enumerate(rest): - value += r << ((count - i - 1)*8) - - return value - - @check_closed - def vector (self, get_type, skip = False): - nelems = self.number() - - if skip: - for i in range(nelems): - get_type(skip = True) - else: - return (get_type() for i in range(nelems)) - - @check_closed - def string (self, skip = False): - nelems = self.number() - - if skip: - self.file.seek(nelems, os.SEEK_CUR) - else: - s = self.file.read(nelems) - - if len(s) != nelems: - raise EndOfFileException, self.filename - - return s - - @check_closed - def overlay (self, skip = False): - if skip: - self.file.seek(self.number(), os.SEEK_CUR) # path - self.file.seek(self.number(), os.SEEK_CUR) # label - else: - return (self.string(), self.string()) - - def _get_bytes (self, length, expect_list = False): - s = self.file.read(length) - - if len(s) != length: - raise EndOfFileException, self.filename - - if length == 1 and not expect_list: - return ord(s) # is faster than unpack and we have a scalar - else: - return struct.unpack("%sB" % length, s) - - @check_closed - def close (self): - if self.closed: - raise EixReaderClosed - - self.file.close() - self.closed = 1 - - debug("EixReader closed.") -- cgit v1.2.3-70-g09d2