--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/python-2.5.2/win32/Lib/test/test_largefile.py Fri Apr 03 17:19:34 2009 +0100
@@ -0,0 +1,170 @@
+#!python
+
+#----------------------------------------------------------------------
+# test largefile support on system where this makes sense
+#
+#----------------------------------------------------------------------
+
+from test import test_support
+import os, struct, stat, sys
+
+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
+name = test_support.TESTFN
+
+
+# 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':
+ test_support.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(test_support.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()
+ os.unlink(test_support.TESTFN)
+ raise test_support.TestSkipped, \
+ "filesystem does not have largefile support"
+ else:
+ f.close()
+
+
+def expect(got_this, expect_this):
+ if test_support.verbose:
+ print '%r =?= %r ...' % (got_this, expect_this),
+ if got_this != expect_this:
+ if test_support.verbose:
+ print 'no'
+ raise test_support.TestFailed, 'got %r, but expected %r' %\
+ (got_this, expect_this)
+ else:
+ if test_support.verbose:
+ print 'yes'
+
+
+# test that each file function works as expected for a large (i.e. >2GB, do
+# we have to check >4GB) files
+
+if test_support.verbose:
+ print 'create large file via seek (may be sparse file) ...'
+f = open(name, 'wb')
+try:
+ f.write('z')
+ f.seek(0)
+ f.seek(size)
+ f.write('a')
+ f.flush()
+ if test_support.verbose:
+ print 'check file size with os.fstat'
+ expect(os.fstat(f.fileno())[stat.ST_SIZE], size+1)
+finally:
+ f.close()
+if test_support.verbose:
+ print 'check file size with os.stat'
+expect(os.stat(name)[stat.ST_SIZE], size+1)
+
+if test_support.verbose:
+ print 'play around with seek() and read() with the built largefile'
+f = open(name, 'rb')
+try:
+ expect(f.tell(), 0)
+ expect(f.read(1), 'z')
+ expect(f.tell(), 1)
+ f.seek(0)
+ expect(f.tell(), 0)
+ f.seek(0, 0)
+ expect(f.tell(), 0)
+ f.seek(42)
+ expect(f.tell(), 42)
+ f.seek(42, 0)
+ expect(f.tell(), 42)
+ f.seek(42, 1)
+ expect(f.tell(), 84)
+ f.seek(0, 1)
+ expect(f.tell(), 84)
+ f.seek(0, 2) # seek from the end
+ expect(f.tell(), size + 1 + 0)
+ f.seek(-10, 2)
+ expect(f.tell(), size + 1 - 10)
+ f.seek(-size-1, 2)
+ expect(f.tell(), 0)
+ f.seek(size)
+ expect(f.tell(), size)
+ expect(f.read(1), 'a') # the 'a' that was written at the end of file above
+ f.seek(-size-1, 1)
+ expect(f.read(1), 'z')
+ expect(f.tell(), 1)
+finally:
+ f.close()
+
+if test_support.verbose:
+ print 'play around with os.lseek() with the built largefile'
+f = open(name, 'rb')
+try:
+ expect(os.lseek(f.fileno(), 0, 0), 0)
+ expect(os.lseek(f.fileno(), 42, 0), 42)
+ expect(os.lseek(f.fileno(), 42, 1), 84)
+ expect(os.lseek(f.fileno(), 0, 1), 84)
+ expect(os.lseek(f.fileno(), 0, 2), size+1+0)
+ expect(os.lseek(f.fileno(), -10, 2), size+1-10)
+ expect(os.lseek(f.fileno(), -size-1, 2), 0)
+ expect(os.lseek(f.fileno(), size, 0), size)
+ expect(f.read(1), 'a') # the 'a' that was written at the end of file above
+finally:
+ f.close()
+
+if hasattr(f, 'truncate'):
+ if test_support.verbose:
+ print 'try truncate'
+ f = open(name, 'r+b')
+ try:
+ f.seek(0, 2)
+ expect(f.tell(), size+1) # else we've lost track of the true size
+ # Cut it back via seek + truncate with no argument.
+ newsize = size - 10
+ f.seek(newsize)
+ f.truncate()
+ expect(f.tell(), newsize) # else pointer moved
+ f.seek(0, 2)
+ expect(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)
+ expect(f.tell(), 42) # else pointer moved
+ f.seek(0, 2)
+ expect(f.tell(), newsize) # else wasn't truncated
+
+ # XXX truncate(larger than true size) is ill-defined across platforms
+
+ # cut it waaaaay back
+ f.seek(0)
+ f.truncate(1)
+ expect(f.tell(), 0) # else pointer moved
+ expect(len(f.read()), 1) # else wasn't truncated
+
+ finally:
+ f.close()
+
+os.unlink(name)