mirror of https://github.com/python/cpython
116 lines
2.9 KiB
Python
116 lines
2.9 KiB
Python
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import mmap
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import string, os, re, sys
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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 an mmap'ed file
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f = open('foo', 'w+')
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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 ' Position of foo:', string.find(m, 'foo') / float(PAGESIZE), 'pages'
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assert string.find(m, 'foo') == PAGESIZE
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print ' Length of file:', len(m) / float(PAGESIZE), 'pages'
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assert len(m) == 2*PAGESIZE
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print ' Contents of byte 0:', repr(m[0])
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assert m[0] == '\0'
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print ' Contents of first 3 bytes:', repr(m[0:3])
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assert 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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assert m[0] == '3'
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print ' Contents of first 3 bytes:', repr(m[0:3])
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assert m[0:3] == '3\0\0'
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print ' Contents of second page:', m[PAGESIZE-1 : PAGESIZE + 7]
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assert 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 == 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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assert start == PAGESIZE
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assert 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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assert m.tell() == 0
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m.seek(42,1)
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print ' Seek to 42nd byte'
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assert m.tell() == 42
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m.seek(0,2)
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print ' Seek to last byte'
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assert 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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assert 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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assert 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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assert 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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pass
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m.close()
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os.unlink("foo")
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print ' Test passed'
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test_both()
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