We're still missing tests that cover important cases.  Unexecuted code
below:

>>>>>>             if l > len(data) - 8:
>>>>>>                 pos += l
>>>>>>                 break
>>>>>>             s = l + 1
>>>>>>             tl = u64(data[s:s+8])
>>>>>>             if tl < pos:
>>>>>>                 return pos + s + 8

>>>>>>         except:
>>>>>>             if partial and nrec:
>>>>>>                 ofs._status = 'p'
>>>>>>                 ofs.tpc_vote(transaction)
>>>>>>                 ofs.tpc_finish(transaction)
>>>>>>                 if verbose:
>>>>>>                     print 'partial'
                   else:
>>>>>>                 ofs.tpc_abort(transaction)
>>>>>>             print "\n%s: %s\n" % sys.exc_info()[:2]
>>>>>>             if not verbose:
>>>>>>                 progress(prog1)
>>>>>>             pos = scan(file, pos)