Header issues

Issue #28 new
Former user created an issue

When attempting to read my file I am receiving the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/prod/user/home/XXXXXX/sas7bdat/sas7bdat.py", line 105, in __init__
    self.header = self._readHeader()
  File "/prod/user/home/XXXXXX/sas7bdat/sas7bdat.py", line 352, in _readHeader
    h += f.read(hl - 288)
ValueError: read length must be positive or -1

My value for hl is -1060364288, my align1 value is 0, and u64 is False. Any suggestions for fixes or possible locations of failures. Unfortunately, the document that I'm working on is sensitive so I cannot include it.

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