summaryrefslogtreecommitdiff
path: root/portato/eix/parser.py
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--portato/eix/parser.py86
1 files changed, 86 insertions, 0 deletions
diff --git a/portato/eix/parser.py b/portato/eix/parser.py
new file mode 100644
index 0000000..e89bffe
--- /dev/null
+++ b/portato/eix/parser.py
@@ -0,0 +1,86 @@
+# -*- coding: utf-8 -*-
+#
+# File: portato/eix/parser.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 <necoro@necoro.net>
+
+from __future__ import absolute_import, with_statement
+
+import os
+import struct
+
+from .helper import debug
+
+from . import exceptions as ex
+
+def _get_bytes (file, length, expect_list = False):
+ s = file.read(length)
+
+ if len(s) != length:
+ raise EndOfFileException, file.name
+
+ 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)
+
+def number (file):
+ n = _get_bytes(file, 1)
+
+ if n < 0xFF:
+ value = n
+ else:
+ count = 0
+
+ while (n == 0xFF):
+ count += 1
+ n = _get_bytes(file, 1)
+
+ if n == 0:
+ n = 0xFF # 0xFF is encoded as 0xFF 0x00
+ count -= 1
+
+ value = n << (count*8)
+
+ if count > 0:
+ rest = _get_bytes(file, count, expect_list = True)
+
+ for i, r in enumerate(rest):
+ value += r << ((count - i - 1)*8)
+
+ return value
+
+def vector (file, get_type, skip = False):
+ nelems = number(file)
+
+ if skip:
+ for i in range(nelems):
+ get_type(file, skip = True)
+ else:
+ return (get_type(file) for i in range(nelems))
+
+def string (file, skip = False):
+ nelems = number(file)
+
+ if skip:
+ file.seek(nelems, os.SEEK_CUR)
+ else:
+ s = file.read(nelems)
+
+ if len(s) != nelems:
+ raise EndOfFileException, file.name
+
+ return s
+
+def overlay (file, skip = False):
+ if skip:
+ string(file, skip = True) # path
+ string(file, skip = True) # label
+ else:
+ return (string(file), string(file))