Some files in openjpeg-data corpus result in 'unknown error'

[bitsgalore]

Happens for some files in 'input' folder in https://github.com/uclouvain/openjpeg-data. Occurs for both jpylyzer 1.18 and latest dev version.

[bitsgalore]

Some more details: most of these files fail with something like this:

File "/home/johan/jpylyzer/jpylyzer/boxvalidator.py", line 1335, in validate_contiguousCodestreamBox
    tileIndex] = tilePartsPerTileFound[tileIndex] + 1
KeyError: 2048

For the first file the value of numberOfTilesExpected turned out to be a negative number, which was caused by xOsiz being >> xsiz. Setting the computed number of tiles to a minimum value of 1 prevents the crash for some images, but no for all. Below tables shows the result after this first fix:

Image	status
0290cb77c5df21828fa74cf2ab2c84d8.SIGFPE.d25.31.jp2	OK
2539.pdf.SIGFPE.706.1712.jp2	KeyError (1335)
26ccf3651020967f7778238ef5af08af.SIGFPE.d25.527.jp2	OK
2.pdf.SIGFPE.706.1112.jp2	KeyError: 16384 (1335)
4035.pdf.SIGSEGV.d8b.3375.jp2	KeyError: 1 (1335)
edf_c2_1000234.jp2	UnboundLocalError: local variable 'commentIsValid' referenced before assignment (2018)
edf_c2_1015644.jp2	KeyError: 2048 (1335)
gdal_fuzzer_unchecked_numresolutions.jp2	OK
issue427-null-image-size.jp2	OK

Note the completely unrelated error for edf_c2_1000234.jp2.

[bitsgalore]

• Tilepart bug solved by https://github.com/openpreserve/jpylyzer/commit/44982aa26b088e9e3296b7b73d221f2de6d1cebc (and https://github.com/openpreserve/jpylyzer/commit/6fee7b4e2bc8a144aae35a42ca5cdffaeb01ca39).
• Comment bug solved by https://github.com/openpreserve/jpylyzer/commit/e4c5aa3fbf46a51919daedad491d0890ed982d58