Add get_size() method for local files.

doc/changelog.txt

@@ -14,6 +14,9 @@ Changes:
 - logging: Use more memory-efficient wire-format for UrlBase,
   using __slots__.
   Closes: SF bug #2976995
+- checking: Get size from Content-Length HTTP header, from stat(2)
+  for local files so size information is available without downloading
+  the content data.
 
 Features:
 - ftp: Detect and support UTF-8 filename encoding capability of FTP

linkcheck/fileutil.py

@@ -138,6 +138,14 @@ def get_mtime (filename):
         return 0
 
 
+def get_size (filename):
+    """Return file size in Bytes, or -1 on error."""
+    try:
+        return os.stat(filename)[stat.ST_SIZE]
+    except os.error:
+        return -1
+
+
 # http://developer.gnome.org/doc/API/2.0/glib/glib-running.html
 if "G_FILENAME_ENCODING" in os.environ:
     FSCODING = os.environ["G_FILENAME_ENCODING"].split(",")[0]

tests/test_fileutil.py

@@ -0,0 +1,38 @@
+# -*- coding: iso-8859-1 -*-
+# Copyright (C) 2010 Bastian Kleineidam
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+"""
+Test file utility functions.
+"""
+
+import unittest
+import linkcheck.fileutil
+
+file_existing = __file__
+file_non_existing = "XXX.i_dont_exist"
+
+class TestFileutil (unittest.TestCase):
+    """Test file utility functions."""
+
+    def test_size (self):
+        self.assertTrue(linkcheck.fileutil.get_size(file_existing) > 0)
+        self.assertEqual(linkcheck.fileutil.get_size(file_non_existing), -1)
+
+
+    def test_mtime (self):
+        filename = __file__
+        self.assertTrue(linkcheck.fileutil.get_mtime(file_existing) > 0)
+        self.assertEqual(linkcheck.fileutil.get_mtime(file_non_existing), 0)