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6278799f8e
Remove unused import of "sys". If the file TESTFN exists before we start, try to remove it. Add spaces around the = in some assignments.
138 lines
3.9 KiB
Python
138 lines
3.9 KiB
Python
from test_support import verify, TESTFN
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import mmap
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import os, re
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PAGESIZE = mmap.PAGESIZE
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def test_both():
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"Test mmap module on Unix systems and Windows"
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# Create a file to be mmap'ed.
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if os.path.exists(TESTFN):
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os.unlink(TESTFN)
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f = open(TESTFN, 'w+')
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try: # unlink TESTFN no matter what
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# Write 2 pages worth of data to the file
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f.write('\0'* PAGESIZE)
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f.write('foo')
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f.write('\0'* (PAGESIZE-3) )
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m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
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f.close()
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# Simple sanity checks
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print type(m) # SF bug 128713: segfaulted on Linux
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print ' Position of foo:', m.find('foo') / float(PAGESIZE), 'pages'
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verify(m.find('foo') == PAGESIZE)
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print ' Length of file:', len(m) / float(PAGESIZE), 'pages'
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verify(len(m) == 2*PAGESIZE)
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print ' Contents of byte 0:', repr(m[0])
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verify(m[0] == '\0')
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print ' Contents of first 3 bytes:', repr(m[0:3])
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verify(m[0:3] == '\0\0\0')
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# Modify the file's content
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print "\n Modifying file's content..."
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m[0] = '3'
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m[PAGESIZE +3: PAGESIZE +3+3] = 'bar'
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# Check that the modification worked
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print ' Contents of byte 0:', repr(m[0])
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verify(m[0] == '3')
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print ' Contents of first 3 bytes:', repr(m[0:3])
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verify(m[0:3] == '3\0\0')
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print ' Contents of second page:', repr(m[PAGESIZE-1 : PAGESIZE + 7])
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verify(m[PAGESIZE-1 : PAGESIZE + 7] == '\0foobar\0')
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m.flush()
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# Test doing a regular expression match in an mmap'ed file
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match = re.search('[A-Za-z]+', m)
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if match is None:
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print ' ERROR: regex match on mmap failed!'
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else:
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start, end = match.span(0)
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length = end - start
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print ' Regex match on mmap (page start, length of match):',
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print start / float(PAGESIZE), length
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verify(start == PAGESIZE)
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verify(end == PAGESIZE + 6)
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# test seeking around (try to overflow the seek implementation)
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m.seek(0,0)
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print ' Seek to zeroth byte'
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verify(m.tell() == 0)
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m.seek(42,1)
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print ' Seek to 42nd byte'
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verify(m.tell() == 42)
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m.seek(0,2)
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print ' Seek to last byte'
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verify(m.tell() == len(m))
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print ' Try to seek to negative position...'
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try:
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m.seek(-1)
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except ValueError:
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pass
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else:
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verify(0, 'expected a ValueError but did not get it')
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print ' Try to seek beyond end of mmap...'
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try:
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m.seek(1,2)
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except ValueError:
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pass
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else:
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verify(0, 'expected a ValueError but did not get it')
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print ' Try to seek to negative position...'
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try:
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m.seek(-len(m)-1,2)
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except ValueError:
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pass
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else:
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verify(0, 'expected a ValueError but did not get it')
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# Try resizing map
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print ' Attempting resize()'
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try:
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m.resize( 512 )
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except SystemError:
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# resize() not supported
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# No messages are printed, since the output of this test suite
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# would then be different across platforms.
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pass
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else:
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# resize() is supported
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verify(len(m) == 512,
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"len(m) is %d, but expecting 512" % (len(m),) )
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# Check that we can no longer seek beyond the new size.
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try:
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m.seek(513,0)
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except ValueError:
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pass
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else:
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verify(0, 'Could seek beyond the new size')
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m.close()
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finally:
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try:
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f.close()
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except OSError:
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pass
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try:
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os.unlink(TESTFN)
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except OSError:
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pass
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print ' Test passed'
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test_both()
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