--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/python-2.6.1/Lib/test/test_largefile.py Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,177 @@
+"""Test largefile support on system where this makes sense.
+"""
+
+import os
+import stat
+import sys
+import unittest
+from test.test_support import run_unittest, TESTFN, verbose, requires, \
+ TestSkipped, unlink
+
+try:
+ import signal
+ # The default handler for SIGXFSZ is to abort the process.
+ # By ignoring it, system calls exceeding the file size resource
+ # limit will raise IOError instead of crashing the interpreter.
+ oldhandler = signal.signal(signal.SIGXFSZ, signal.SIG_IGN)
+except (ImportError, AttributeError):
+ pass
+
+# create >2GB file (2GB = 2147483648 bytes)
+size = 2500000000L
+
+
+class TestCase(unittest.TestCase):
+ """Test that each file function works as expected for a large
+ (i.e. > 2GB, do we have to check > 4GB) files.
+
+ NOTE: the order of execution of the test methods is important! test_seek
+ must run first to create the test file. File cleanup must also be handled
+ outside the test instances because of this.
+
+ """
+
+ def test_seek(self):
+ if verbose:
+ print 'create large file via seek (may be sparse file) ...'
+ with open(TESTFN, 'wb') as f:
+ f.write('z')
+ f.seek(0)
+ f.seek(size)
+ f.write('a')
+ f.flush()
+ if verbose:
+ print 'check file size with os.fstat'
+ self.assertEqual(os.fstat(f.fileno())[stat.ST_SIZE], size+1)
+
+ def test_osstat(self):
+ if verbose:
+ print 'check file size with os.stat'
+ self.assertEqual(os.stat(TESTFN)[stat.ST_SIZE], size+1)
+
+ def test_seek_read(self):
+ if verbose:
+ print 'play around with seek() and read() with the built largefile'
+ with open(TESTFN, 'rb') as f:
+ self.assertEqual(f.tell(), 0)
+ self.assertEqual(f.read(1), 'z')
+ self.assertEqual(f.tell(), 1)
+ f.seek(0)
+ self.assertEqual(f.tell(), 0)
+ f.seek(0, 0)
+ self.assertEqual(f.tell(), 0)
+ f.seek(42)
+ self.assertEqual(f.tell(), 42)
+ f.seek(42, 0)
+ self.assertEqual(f.tell(), 42)
+ f.seek(42, 1)
+ self.assertEqual(f.tell(), 84)
+ f.seek(0, 1)
+ self.assertEqual(f.tell(), 84)
+ f.seek(0, 2) # seek from the end
+ self.assertEqual(f.tell(), size + 1 + 0)
+ f.seek(-10, 2)
+ self.assertEqual(f.tell(), size + 1 - 10)
+ f.seek(-size-1, 2)
+ self.assertEqual(f.tell(), 0)
+ f.seek(size)
+ self.assertEqual(f.tell(), size)
+ # the 'a' that was written at the end of file above
+ self.assertEqual(f.read(1), 'a')
+ f.seek(-size-1, 1)
+ self.assertEqual(f.read(1), 'z')
+ self.assertEqual(f.tell(), 1)
+
+ def test_lseek(self):
+ if verbose:
+ print 'play around with os.lseek() with the built largefile'
+ with open(TESTFN, 'rb') as f:
+ self.assertEqual(os.lseek(f.fileno(), 0, 0), 0)
+ self.assertEqual(os.lseek(f.fileno(), 42, 0), 42)
+ self.assertEqual(os.lseek(f.fileno(), 42, 1), 84)
+ self.assertEqual(os.lseek(f.fileno(), 0, 1), 84)
+ self.assertEqual(os.lseek(f.fileno(), 0, 2), size+1+0)
+ self.assertEqual(os.lseek(f.fileno(), -10, 2), size+1-10)
+ self.assertEqual(os.lseek(f.fileno(), -size-1, 2), 0)
+ self.assertEqual(os.lseek(f.fileno(), size, 0), size)
+ # the 'a' that was written at the end of file above
+ self.assertEqual(f.read(1), 'a')
+
+ def test_truncate(self):
+ if verbose:
+ print 'try truncate'
+ with open(TESTFN, 'r+b') as f:
+ # this is already decided before start running the test suite
+ # but we do it anyway for extra protection
+ if not hasattr(f, 'truncate'):
+ raise TestSkipped, "open().truncate() not available on this system"
+ f.seek(0, 2)
+ # else we've lost track of the true size
+ self.assertEqual(f.tell(), size+1)
+ # Cut it back via seek + truncate with no argument.
+ newsize = size - 10
+ f.seek(newsize)
+ f.truncate()
+ self.assertEqual(f.tell(), newsize) # else pointer moved
+ f.seek(0, 2)
+ self.assertEqual(f.tell(), newsize) # else wasn't truncated
+ # Ensure that truncate(smaller than true size) shrinks
+ # the file.
+ newsize -= 1
+ f.seek(42)
+ f.truncate(newsize)
+ self.assertEqual(f.tell(), 42) # else pointer moved
+ f.seek(0, 2)
+ self.assertEqual(f.tell(), newsize) # else wasn't truncated
+
+ # XXX truncate(larger than true size) is ill-defined
+ # across platform; cut it waaaaay back
+ f.seek(0)
+ f.truncate(1)
+ self.assertEqual(f.tell(), 0) # else pointer moved
+ self.assertEqual(len(f.read()), 1) # else wasn't truncated
+
+
+def test_main():
+ # On Windows and Mac OSX this test comsumes large resources; It
+ # takes a long time to build the >2GB file and takes >2GB of disk
+ # space therefore the resource must be enabled to run this test.
+ # If not, nothing after this line stanza will be executed.
+ if sys.platform[:3] == 'win' or sys.platform == 'darwin':
+ requires('largefile',
+ 'test requires %s bytes and a long time to run' % str(size))
+ else:
+ # Only run if the current filesystem supports large files.
+ # (Skip this test on Windows, since we now always support
+ # large files.)
+ f = open(TESTFN, 'wb')
+ try:
+ # 2**31 == 2147483648
+ f.seek(2147483649L)
+ # Seeking is not enough of a test: you must write and
+ # flush, too!
+ f.write("x")
+ f.flush()
+ except (IOError, OverflowError):
+ f.close()
+ unlink(TESTFN)
+ raise TestSkipped, "filesystem does not have largefile support"
+ else:
+ f.close()
+ suite = unittest.TestSuite()
+ suite.addTest(TestCase('test_seek'))
+ suite.addTest(TestCase('test_osstat'))
+ suite.addTest(TestCase('test_seek_read'))
+ suite.addTest(TestCase('test_lseek'))
+ with open(TESTFN, 'w') as f:
+ if hasattr(f, 'truncate'):
+ suite.addTest(TestCase('test_truncate'))
+ unlink(TESTFN)
+ try:
+ run_unittest(suite)
+ finally:
+ unlink(TESTFN)
+
+
+if __name__ == '__main__':
+ test_main()