Fix bugs when reading big-endian u64 SAS catalog files #293
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This PR fixes a few bugs when reading big-endian u64 SAS catalog files.
In some cases ReadStat is currently checking a single byte for a value which is actually stored as a 16 bit int, which works fine on little-endian files but returns 0 when a file is big-endian.
The other changes just change the integer size being read from the file - it was incorrect in a few spots but only causes an issue when it's a big-endian file.
From tidyverse/haven#696 - example catalog files at haven_reprex_github.zip. This zip contains the same format file produced by multiple versions of SAS, so I've been working off direct comparisons between the two files.
Thanks!