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