Failed to allocate memory for to read TIFF directory (0 elements of 12 bytes each)

[shawn]

Context

Issue type** (bug report):
Operating system** (Windows 10):
Platform** (64-bit x86,):
OpenSlide Python version** (py3.6.10):
OpenSlide version** (openslide.__library_version__):
Slide format (SVS,):

Details:

Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
C:\Users\sk\Desktop\python\openslide-python-master\examples\deepzoom\slide\ftv0fno1ontsv4ce2d1cpaj0_0.svs: Failed to allocate memory for to read TIFF directory (0 elements of 12 bytes each).
TIFFReadDirectory: Failed to read directory at offset 858581370.
C:\Users\sk\Desktop\python\openslide-python-master\examples\deepzoom\slide\ftv0fno1ontsv4ce2d1cpaj0_0.svs: Failed to allocate memory for to read TIFF directory (0 elements of 12 bytes each).
TIFFReadDirectory: Failed to read directory at offset 858581370.
127.0.0.1 - - [18/Aug/2020 12:28:57] "�[37mGET /ftv0fno1ontsv4ce2d1cpaj0_0.svs HTTP/1.1�[0m" 200 -
127.0.0.1 - - [18/Aug/2020 12:28:57] "�[37mGET /ftv0fno1ontsv4ce2d1cpaj0_0.svs.dzi HTTP/1.1�[0m" 200 -
[2020-08-18 12:29:15,583] ERROR in app: Exception on /ftv0fno1ontsv4ce2d1cpaj0_0.svs_files/8/0_0.jpeg [GET]
Traceback (most recent call last):
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\flask\app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\flask\app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\flask_compat.py", line 39, in reraise
raise value
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\flask\app.py", line 1936, in dispatch_request
return self.view_functionsrule.endpoint
File "deepzoom_multiserver.py", line 160, in tile
tile = slide.get_tile(level, (col, row))
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\openslide\deepzoom.py", line 150, in get_tile
tile = self.osr.read_region(*args)
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\openslide_init.py", line 223, in read_region
level, size[0], size[1])
File "C:\Users\sk\anaconda3\envs\pviewer\lib\site-packages\openslide\lowlevel.py", line 258, in read_region
buf = (w * h * c_uint32)()
MemoryError
aperio open is ok
openslide open : TIFFReadDirectory: Failed to read directory at offset 858581370
and Memory up to 90%
fail to open .svs  file download url:      https://slice-telepathcloud.oss-cn-shanghai.aliyuncs.com/ybl2ossmove/202008/17/92_b5c63040533829f93b6b43f0a71b2486/ftv0fno1ontsv4ce2d1cpaj0_0.svs
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